kris/xmss-KAT-generator
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Refactor for more consistent style and readability

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This commit is contained in:
Joost Rijneveld 2017-08-03 17:38:34 +02:00
parent 1076b37321
commit 9d5884e120
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GPG Key ID: 307BC77F47D58EE2
17 changed files with 1712 additions and 1687 deletions
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669
fips202.c
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@ -14,22 +14,22 @@
static uint64_t load64(const unsigned char *x) static uint64_t load64(const unsigned char *x)
{ {
unsigned long long r = 0, i; unsigned long long r = 0, i;
for (i = 0; i < 8; ++i) { for (i = 0; i < 8; ++i) {
r |= (unsigned long long)x[i] << 8 * i; r |= (unsigned long long)x[i] << 8 * i;
} }
return r; return r;
} }
static void store64(uint8_t *x, uint64_t u) static void store64(uint8_t *x, uint64_t u)
{ {
unsigned int i; unsigned int i;
for(i=0; i<8; ++i) { for (i = 0; i < 8; ++i) {
x[i] = u; x[i] = u;
u >>= 8; u >>= 8;
} }
} }
static const uint64_t KeccakF_RoundConstants[NROUNDS] = static const uint64_t KeccakF_RoundConstants[NROUNDS] =
@ -62,357 +62,356 @@ static const uint64_t KeccakF_RoundConstants[NROUNDS] =
void KeccakF1600_StatePermute(uint64_t * state) void KeccakF1600_StatePermute(uint64_t * state)
{ {
int round; int round;
uint64_t Aba, Abe, Abi, Abo, Abu; uint64_t Aba, Abe, Abi, Abo, Abu;
uint64_t Aga, Age, Agi, Ago, Agu; uint64_t Aga, Age, Agi, Ago, Agu;
uint64_t Aka, Ake, Aki, Ako, Aku; uint64_t Aka, Ake, Aki, Ako, Aku;
uint64_t Ama, Ame, Ami, Amo, Amu; uint64_t Ama, Ame, Ami, Amo, Amu;
uint64_t Asa, Ase, Asi, Aso, Asu; uint64_t Asa, Ase, Asi, Aso, Asu;
uint64_t BCa, BCe, BCi, BCo, BCu; uint64_t BCa, BCe, BCi, BCo, BCu;
uint64_t Da, De, Di, Do, Du; uint64_t Da, De, Di, Do, Du;
uint64_t Eba, Ebe, Ebi, Ebo, Ebu; uint64_t Eba, Ebe, Ebi, Ebo, Ebu;
uint64_t Ega, Ege, Egi, Ego, Egu; uint64_t Ega, Ege, Egi, Ego, Egu;
uint64_t Eka, Eke, Eki, Eko, Eku; uint64_t Eka, Eke, Eki, Eko, Eku;
uint64_t Ema, Eme, Emi, Emo, Emu; uint64_t Ema, Eme, Emi, Emo, Emu;
uint64_t Esa, Ese, Esi, Eso, Esu; uint64_t Esa, Ese, Esi, Eso, Esu;
//copyFromState(A, state) //copyFromState(A, state)
Aba = state[ 0]; Aba = state[ 0];
Abe = state[ 1]; Abe = state[ 1];
Abi = state[ 2]; Abi = state[ 2];
Abo = state[ 3]; Abo = state[ 3];
Abu = state[ 4]; Abu = state[ 4];
Aga = state[ 5]; Aga = state[ 5];
Age = state[ 6]; Age = state[ 6];
Agi = state[ 7]; Agi = state[ 7];
Ago = state[ 8]; Ago = state[ 8];
Agu = state[ 9]; Agu = state[ 9];
Aka = state[10]; Aka = state[10];
Ake = state[11]; Ake = state[11];
Aki = state[12]; Aki = state[12];
Ako = state[13]; Ako = state[13];
Aku = state[14]; Aku = state[14];
Ama = state[15]; Ama = state[15];
Ame = state[16]; Ame = state[16];
Ami = state[17]; Ami = state[17];
Amo = state[18]; Amo = state[18];
Amu = state[19]; Amu = state[19];
Asa = state[20]; Asa = state[20];
Ase = state[21]; Ase = state[21];
Asi = state[22]; Asi = state[22];
Aso = state[23]; Aso = state[23];
Asu = state[24]; Asu = state[24];
for( round = 0; round < NROUNDS; round += 2 ) for (round = 0; round < NROUNDS; round += 2) {
{ // prepareTheta
// prepareTheta BCa = Aba^Aga^Aka^Ama^Asa;
BCa = Aba^Aga^Aka^Ama^Asa; BCe = Abe^Age^Ake^Ame^Ase;
BCe = Abe^Age^Ake^Ame^Ase; BCi = Abi^Agi^Aki^Ami^Asi;
BCi = Abi^Agi^Aki^Ami^Asi; BCo = Abo^Ago^Ako^Amo^Aso;
BCo = Abo^Ago^Ako^Amo^Aso; BCu = Abu^Agu^Aku^Amu^Asu;
BCu = Abu^Agu^Aku^Amu^Asu;
//thetaRhoPiChiIotaPrepareTheta(round , A, E) //thetaRhoPiChiIotaPrepareTheta(round , A, E)
Da = BCu^ROL(BCe, 1); Da = BCu^ROL(BCe, 1);
De = BCa^ROL(BCi, 1); De = BCa^ROL(BCi, 1);
Di = BCe^ROL(BCo, 1); Di = BCe^ROL(BCo, 1);
Do = BCi^ROL(BCu, 1); Do = BCi^ROL(BCu, 1);
Du = BCo^ROL(BCa, 1); Du = BCo^ROL(BCa, 1);
Aba ^= Da; Aba ^= Da;
BCa = Aba; BCa = Aba;
Age ^= De; Age ^= De;
BCe = ROL(Age, 44); BCe = ROL(Age, 44);
Aki ^= Di; Aki ^= Di;
BCi = ROL(Aki, 43); BCi = ROL(Aki, 43);
Amo ^= Do; Amo ^= Do;
BCo = ROL(Amo, 21); BCo = ROL(Amo, 21);
Asu ^= Du; Asu ^= Du;
BCu = ROL(Asu, 14); BCu = ROL(Asu, 14);
Eba = BCa ^((~BCe)& BCi ); Eba = BCa ^((~BCe)& BCi );
Eba ^= (uint64_t)KeccakF_RoundConstants[round]; Eba ^= (uint64_t)KeccakF_RoundConstants[round];
Ebe = BCe ^((~BCi)& BCo ); Ebe = BCe ^((~BCi)& BCo );
Ebi = BCi ^((~BCo)& BCu ); Ebi = BCi ^((~BCo)& BCu );
Ebo = BCo ^((~BCu)& BCa ); Ebo = BCo ^((~BCu)& BCa );
Ebu = BCu ^((~BCa)& BCe ); Ebu = BCu ^((~BCa)& BCe );
Abo ^= Do; Abo ^= Do;
BCa = ROL(Abo, 28); BCa = ROL(Abo, 28);
Agu ^= Du; Agu ^= Du;
BCe = ROL(Agu, 20); BCe = ROL(Agu, 20);
Aka ^= Da; Aka ^= Da;
BCi = ROL(Aka, 3); BCi = ROL(Aka, 3);
Ame ^= De; Ame ^= De;
BCo = ROL(Ame, 45); BCo = ROL(Ame, 45);
Asi ^= Di; Asi ^= Di;
BCu = ROL(Asi, 61); BCu = ROL(Asi, 61);
Ega = BCa ^((~BCe)& BCi ); Ega = BCa ^((~BCe)& BCi );
Ege = BCe ^((~BCi)& BCo ); Ege = BCe ^((~BCi)& BCo );
Egi = BCi ^((~BCo)& BCu ); Egi = BCi ^((~BCo)& BCu );
Ego = BCo ^((~BCu)& BCa ); Ego = BCo ^((~BCu)& BCa );
Egu = BCu ^((~BCa)& BCe ); Egu = BCu ^((~BCa)& BCe );
Abe ^= De; Abe ^= De;
BCa = ROL(Abe, 1); BCa = ROL(Abe, 1);
Agi ^= Di; Agi ^= Di;
BCe = ROL(Agi, 6); BCe = ROL(Agi, 6);
Ako ^= Do; Ako ^= Do;
BCi = ROL(Ako, 25); BCi = ROL(Ako, 25);
Amu ^= Du; Amu ^= Du;
BCo = ROL(Amu, 8); BCo = ROL(Amu, 8);
Asa ^= Da; Asa ^= Da;
BCu = ROL(Asa, 18); BCu = ROL(Asa, 18);
Eka = BCa ^((~BCe)& BCi ); Eka = BCa ^((~BCe)& BCi );
Eke = BCe ^((~BCi)& BCo ); Eke = BCe ^((~BCi)& BCo );
Eki = BCi ^((~BCo)& BCu ); Eki = BCi ^((~BCo)& BCu );
Eko = BCo ^((~BCu)& BCa ); Eko = BCo ^((~BCu)& BCa );
Eku = BCu ^((~BCa)& BCe ); Eku = BCu ^((~BCa)& BCe );
Abu ^= Du; Abu ^= Du;
BCa = ROL(Abu, 27); BCa = ROL(Abu, 27);
Aga ^= Da; Aga ^= Da;
BCe = ROL(Aga, 36); BCe = ROL(Aga, 36);
Ake ^= De; Ake ^= De;
BCi = ROL(Ake, 10); BCi = ROL(Ake, 10);
Ami ^= Di; Ami ^= Di;
BCo = ROL(Ami, 15); BCo = ROL(Ami, 15);
Aso ^= Do; Aso ^= Do;
BCu = ROL(Aso, 56); BCu = ROL(Aso, 56);
Ema = BCa ^((~BCe)& BCi ); Ema = BCa ^((~BCe)& BCi );
Eme = BCe ^((~BCi)& BCo ); Eme = BCe ^((~BCi)& BCo );
Emi = BCi ^((~BCo)& BCu ); Emi = BCi ^((~BCo)& BCu );
Emo = BCo ^((~BCu)& BCa ); Emo = BCo ^((~BCu)& BCa );
Emu = BCu ^((~BCa)& BCe ); Emu = BCu ^((~BCa)& BCe );
Abi ^= Di; Abi ^= Di;
BCa = ROL(Abi, 62); BCa = ROL(Abi, 62);
Ago ^= Do; Ago ^= Do;
BCe = ROL(Ago, 55); BCe = ROL(Ago, 55);
Aku ^= Du; Aku ^= Du;
BCi = ROL(Aku, 39); BCi = ROL(Aku, 39);
Ama ^= Da; Ama ^= Da;
BCo = ROL(Ama, 41); BCo = ROL(Ama, 41);
Ase ^= De; Ase ^= De;
BCu = ROL(Ase, 2); BCu = ROL(Ase, 2);
Esa = BCa ^((~BCe)& BCi ); Esa = BCa ^((~BCe)& BCi );
Ese = BCe ^((~BCi)& BCo ); Ese = BCe ^((~BCi)& BCo );
Esi = BCi ^((~BCo)& BCu ); Esi = BCi ^((~BCo)& BCu );
Eso = BCo ^((~BCu)& BCa ); Eso = BCo ^((~BCu)& BCa );
Esu = BCu ^((~BCa)& BCe ); Esu = BCu ^((~BCa)& BCe );
// prepareTheta // prepareTheta
BCa = Eba^Ega^Eka^Ema^Esa; BCa = Eba^Ega^Eka^Ema^Esa;
BCe = Ebe^Ege^Eke^Eme^Ese; BCe = Ebe^Ege^Eke^Eme^Ese;
BCi = Ebi^Egi^Eki^Emi^Esi; BCi = Ebi^Egi^Eki^Emi^Esi;
BCo = Ebo^Ego^Eko^Emo^Eso; BCo = Ebo^Ego^Eko^Emo^Eso;
BCu = Ebu^Egu^Eku^Emu^Esu; BCu = Ebu^Egu^Eku^Emu^Esu;
//thetaRhoPiChiIotaPrepareTheta(round+1, E, A) //thetaRhoPiChiIotaPrepareTheta(round+1, E, A)
Da = BCu^ROL(BCe, 1); Da = BCu^ROL(BCe, 1);
De = BCa^ROL(BCi, 1); De = BCa^ROL(BCi, 1);
Di = BCe^ROL(BCo, 1); Di = BCe^ROL(BCo, 1);
Do = BCi^ROL(BCu, 1); Do = BCi^ROL(BCu, 1);
Du = BCo^ROL(BCa, 1); Du = BCo^ROL(BCa, 1);
Eba ^= Da; Eba ^= Da;
BCa = Eba; BCa = Eba;
Ege ^= De; Ege ^= De;
BCe = ROL(Ege, 44); BCe = ROL(Ege, 44);
Eki ^= Di; Eki ^= Di;
BCi = ROL(Eki, 43); BCi = ROL(Eki, 43);
Emo ^= Do; Emo ^= Do;
BCo = ROL(Emo, 21); BCo = ROL(Emo, 21);
Esu ^= Du; Esu ^= Du;
BCu = ROL(Esu, 14); BCu = ROL(Esu, 14);
Aba = BCa ^((~BCe)& BCi ); Aba = BCa ^((~BCe)& BCi );
Aba ^= (uint64_t)KeccakF_RoundConstants[round+1]; Aba ^= (uint64_t)KeccakF_RoundConstants[round+1];
Abe = BCe ^((~BCi)& BCo ); Abe = BCe ^((~BCi)& BCo );
Abi = BCi ^((~BCo)& BCu ); Abi = BCi ^((~BCo)& BCu );
Abo = BCo ^((~BCu)& BCa ); Abo = BCo ^((~BCu)& BCa );
Abu = BCu ^((~BCa)& BCe ); Abu = BCu ^((~BCa)& BCe );
Ebo ^= Do; Ebo ^= Do;
BCa = ROL(Ebo, 28); BCa = ROL(Ebo, 28);
Egu ^= Du; Egu ^= Du;
BCe = ROL(Egu, 20); BCe = ROL(Egu, 20);
Eka ^= Da; Eka ^= Da;
BCi = ROL(Eka, 3); BCi = ROL(Eka, 3);
Eme ^= De; Eme ^= De;
BCo = ROL(Eme, 45); BCo = ROL(Eme, 45);
Esi ^= Di; Esi ^= Di;
BCu = ROL(Esi, 61); BCu = ROL(Esi, 61);
Aga = BCa ^((~BCe)& BCi ); Aga = BCa ^((~BCe)& BCi );
Age = BCe ^((~BCi)& BCo ); Age = BCe ^((~BCi)& BCo );
Agi = BCi ^((~BCo)& BCu ); Agi = BCi ^((~BCo)& BCu );
Ago = BCo ^((~BCu)& BCa ); Ago = BCo ^((~BCu)& BCa );
Agu = BCu ^((~BCa)& BCe ); Agu = BCu ^((~BCa)& BCe );
Ebe ^= De; Ebe ^= De;
BCa = ROL(Ebe, 1); BCa = ROL(Ebe, 1);
Egi ^= Di; Egi ^= Di;
BCe = ROL(Egi, 6); BCe = ROL(Egi, 6);
Eko ^= Do; Eko ^= Do;
BCi = ROL(Eko, 25); BCi = ROL(Eko, 25);
Emu ^= Du; Emu ^= Du;
BCo = ROL(Emu, 8); BCo = ROL(Emu, 8);
Esa ^= Da; Esa ^= Da;
BCu = ROL(Esa, 18); BCu = ROL(Esa, 18);
Aka = BCa ^((~BCe)& BCi ); Aka = BCa ^((~BCe)& BCi );
Ake = BCe ^((~BCi)& BCo ); Ake = BCe ^((~BCi)& BCo );
Aki = BCi ^((~BCo)& BCu ); Aki = BCi ^((~BCo)& BCu );
Ako = BCo ^((~BCu)& BCa ); Ako = BCo ^((~BCu)& BCa );
Aku = BCu ^((~BCa)& BCe ); Aku = BCu ^((~BCa)& BCe );
Ebu ^= Du; Ebu ^= Du;
BCa = ROL(Ebu, 27); BCa = ROL(Ebu, 27);
Ega ^= Da; Ega ^= Da;
BCe = ROL(Ega, 36); BCe = ROL(Ega, 36);
Eke ^= De; Eke ^= De;
BCi = ROL(Eke, 10); BCi = ROL(Eke, 10);
Emi ^= Di; Emi ^= Di;
BCo = ROL(Emi, 15); BCo = ROL(Emi, 15);
Eso ^= Do; Eso ^= Do;
BCu = ROL(Eso, 56); BCu = ROL(Eso, 56);
Ama = BCa ^((~BCe)& BCi ); Ama = BCa ^((~BCe)& BCi );
Ame = BCe ^((~BCi)& BCo ); Ame = BCe ^((~BCi)& BCo );
Ami = BCi ^((~BCo)& BCu ); Ami = BCi ^((~BCo)& BCu );
Amo = BCo ^((~BCu)& BCa ); Amo = BCo ^((~BCu)& BCa );
Amu = BCu ^((~BCa)& BCe ); Amu = BCu ^((~BCa)& BCe );
Ebi ^= Di; Ebi ^= Di;
BCa = ROL(Ebi, 62); BCa = ROL(Ebi, 62);
Ego ^= Do; Ego ^= Do;
BCe = ROL(Ego, 55); BCe = ROL(Ego, 55);
Eku ^= Du; Eku ^= Du;
BCi = ROL(Eku, 39); BCi = ROL(Eku, 39);
Ema ^= Da; Ema ^= Da;
BCo = ROL(Ema, 41); BCo = ROL(Ema, 41);
Ese ^= De; Ese ^= De;
BCu = ROL(Ese, 2); BCu = ROL(Ese, 2);
Asa = BCa ^((~BCe)& BCi ); Asa = BCa ^((~BCe)& BCi );
Ase = BCe ^((~BCi)& BCo ); Ase = BCe ^((~BCi)& BCo );
Asi = BCi ^((~BCo)& BCu ); Asi = BCi ^((~BCo)& BCu );
Aso = BCo ^((~BCu)& BCa ); Aso = BCo ^((~BCu)& BCa );
Asu = BCu ^((~BCa)& BCe ); Asu = BCu ^((~BCa)& BCe );
} }
//copyToState(state, A) //copyToState(state, A)
state[ 0] = Aba; state[ 0] = Aba;
state[ 1] = Abe; state[ 1] = Abe;
state[ 2] = Abi; state[ 2] = Abi;
state[ 3] = Abo; state[ 3] = Abo;
state[ 4] = Abu; state[ 4] = Abu;
state[ 5] = Aga; state[ 5] = Aga;
state[ 6] = Age; state[ 6] = Age;
state[ 7] = Agi; state[ 7] = Agi;
state[ 8] = Ago; state[ 8] = Ago;
state[ 9] = Agu; state[ 9] = Agu;
state[10] = Aka; state[10] = Aka;
state[11] = Ake; state[11] = Ake;
state[12] = Aki; state[12] = Aki;
state[13] = Ako; state[13] = Ako;
state[14] = Aku; state[14] = Aku;
state[15] = Ama; state[15] = Ama;
state[16] = Ame; state[16] = Ame;
state[17] = Ami; state[17] = Ami;
state[18] = Amo; state[18] = Amo;
state[19] = Amu; state[19] = Amu;
state[20] = Asa; state[20] = Asa;
state[21] = Ase; state[21] = Ase;
state[22] = Asi; state[22] = Asi;
state[23] = Aso; state[23] = Aso;
state[24] = Asu; state[24] = Asu;
#undef round
} }
#include <string.h> #include <string.h>
#define MIN(a, b) ((a) < (b) ? (a) : (b))
static void keccak_absorb(uint64_t *s, unsigned int r,
static void keccak_absorb(uint64_t *s, const unsigned char *m, unsigned long long mlen,
unsigned int r,
const unsigned char *m, unsigned long long int mlen,
unsigned char p) unsigned char p)
{ {
unsigned long long i; unsigned long long i;
unsigned char t[200]; unsigned char t[200];
while (mlen >= r) while (mlen >= r) {
{ for (i = 0; i < r / 8; ++i) {
for (i = 0; i < r / 8; ++i) s[i] ^= load64(m + 8 * i);
s[i] ^= load64(m + 8 * i); }
KeccakF1600_StatePermute(s); KeccakF1600_StatePermute(s);
mlen -= r; mlen -= r;
m += r; m += r;
}
for (i = 0; i < r; ++i)
t[i] = 0;
for (i = 0; i < mlen; ++i)
t[i] = m[i];
t[i] = p;
t[r - 1] |= 128;
for (i = 0; i < r / 8; ++i)
s[i] ^= load64(t + 8 * i);
}
static void keccak_squeezeblocks(unsigned char *h, unsigned long long int nblocks,
uint64_t *s,
unsigned int r)
{
unsigned int i;
while(nblocks > 0)
{
KeccakF1600_StatePermute(s);
for(i=0;i<(r>>3);i++)
{
store64(h+8*i, s[i]);
} }
h += r;
nblocks--;
}
}
void shake128(unsigned char *output, unsigned int outputByteLen, const unsigned char *input, unsigned int inputByteLen) for (i = 0; i < r; ++i) {
{ t[i] = 0;
unsigned int i;
uint64_t s[25];
unsigned char d[SHAKE128_RATE];
for(i = 0; i < 25; i++)
s[i] = 0;
keccak_absorb(s, SHAKE128_RATE, input, inputByteLen, 0x1F);
keccak_squeezeblocks(output, outputByteLen/SHAKE128_RATE, s, SHAKE128_RATE);
output += (outputByteLen/SHAKE128_RATE)*SHAKE128_RATE;
if (outputByteLen % SHAKE128_RATE) {
keccak_squeezeblocks(d, 1, s, SHAKE128_RATE);
for(i = 0; i < outputByteLen % SHAKE128_RATE; i++) {
output[i] = d[i];
} }
} for (i = 0; i < mlen; ++i) {
} t[i] = m[i];
}
void shake256(unsigned char *output, unsigned int outputByteLen, const unsigned char *input, unsigned int inputByteLen) t[i] = p;
{ t[r - 1] |= 128;
unsigned int i; for (i = 0; i < r / 8; ++i) {
uint64_t s[25]; s[i] ^= load64(t + 8 * i);
unsigned char d[SHAKE256_RATE]; }
}
for(i = 0; i < 25; i++)
s[i] = 0; static void keccak_squeezeblocks(unsigned char *h, unsigned long long nblocks,
keccak_absorb(s, SHAKE256_RATE, input, inputByteLen, 0x1F); uint64_t *s, unsigned int r)
{
keccak_squeezeblocks(output, outputByteLen/SHAKE256_RATE, s, SHAKE256_RATE); unsigned int i;
output += (outputByteLen/SHAKE256_RATE)*SHAKE256_RATE;
while (nblocks > 0) {
if (outputByteLen % SHAKE256_RATE) { KeccakF1600_StatePermute(s);
keccak_squeezeblocks(d, 1, s, SHAKE256_RATE); for (i = 0; i < (r >> 3); i++) {
for(i = 0; i < outputByteLen % SHAKE256_RATE; i++) { store64(h + 8*i, s[i]);
output[i] = d[i]; }
h += r;
nblocks--;
}
}
void shake128(unsigned char *out, unsigned long long outlen,
const unsigned char *in, unsigned long long inlen)
{
unsigned long long i;
uint64_t s[25];
unsigned char d[SHAKE128_RATE];
for (i = 0; i < 25; i++) {
s[i] = 0;
}
keccak_absorb(s, SHAKE128_RATE, in, inlen, 0x1F);
keccak_squeezeblocks(out, outlen / SHAKE128_RATE, s, SHAKE128_RATE);
out += (outlen / SHAKE128_RATE) * SHAKE128_RATE;
if (outlen % SHAKE128_RATE) {
keccak_squeezeblocks(d, 1, s, SHAKE128_RATE);
for (i = 0; i < outlen % SHAKE128_RATE; i++) {
out[i] = d[i];
}
}
}
void shake256(unsigned char *output, unsigned long long outlen,
const unsigned char *in, unsigned long long inlen)
{
unsigned long long i;
uint64_t s[25];
unsigned char d[SHAKE256_RATE];
for (i = 0; i < 25; i++) {
s[i] = 0;
}
keccak_absorb(s, SHAKE256_RATE, in, inlen, 0x1F);
keccak_squeezeblocks(output, outlen / SHAKE256_RATE, s, SHAKE256_RATE);
output += (outlen / SHAKE256_RATE) * SHAKE256_RATE;
if (outlen % SHAKE256_RATE) {
keccak_squeezeblocks(d, 1, s, SHAKE256_RATE);
for (i = 0; i < outlen % SHAKE256_RATE; i++) {
output[i] = d[i];
}
} }
}
} }

9
fips202.h
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@ -1,12 +1,13 @@
#ifndef FIPS202_H #ifndef FIPS202_H
#define FIPS202_H #define FIPS202_H
#include <stdint.h>
#define SHAKE128_RATE 168 #define SHAKE128_RATE 168
#define SHAKE256_RATE 136 #define SHAKE256_RATE 136
void shake128(unsigned char *output, unsigned int outputByteLen, const unsigned char *input, unsigned int inputByteLen); void shake128(unsigned char *out, unsigned long long outlen,
void shake256(unsigned char *output, unsigned int outputByteLen, const unsigned char *input, unsigned int inputByteLen); const unsigned char *in, unsigned long long inlen);
void shake256(unsigned char *out, unsigned long long outlen,
const unsigned char *in, unsigned long long inlen);
#endif #endif

166
hash.c
View File

@ -11,8 +11,6 @@ Public domain.
#include "hash.h" #include "hash.h"
#include "fips202.h" #include "fips202.h"
#include <stddef.h>
#include <stdio.h>
#include <stdint.h> #include <stdint.h>
#include <string.h> #include <string.h>
#include <openssl/sha.h> #include <openssl/sha.h>
@ -20,117 +18,113 @@ Public domain.
unsigned char* addr_to_byte(unsigned char *bytes, const uint32_t addr[8]) unsigned char* addr_to_byte(unsigned char *bytes, const uint32_t addr[8])
{ {
#if IS_LITTLE_ENDIAN==1 #if IS_LITTLE_ENDIAN==1
int i = 0; int i;
for(i=0;i<8;i++) for (i = 0; i < 8; i++) {
to_byte(bytes+i*4, addr[i],4); to_byte(bytes + i*4, addr[i], 4);
return bytes; }
#else #else
memcpy(bytes, addr, 32); memcpy(bytes, addr, 32);
return bytes;
#endif #endif
return bytes;
} }
static int core_hash(unsigned char *out, const unsigned int type, const unsigned char *key, unsigned int keylen, const unsigned char *in, unsigned long long inlen, int n) static int core_hash(unsigned char *out, const unsigned int type,
const unsigned char *key, unsigned int keylen,
const unsigned char *in, unsigned long long inlen, int n)
{ {
unsigned long long i = 0; unsigned long long i = 0;
unsigned char buf[inlen + n + keylen]; unsigned char buf[inlen + n + keylen];
// Input is (toByte(X, 32) || KEY || M) /* Input is of the form (toByte(X, 32) || KEY || M). */
// set toByte to_byte(buf, type, n);
to_byte(buf, type, n);
for (i=0; i < keylen; i++) { for (i=0; i < keylen; i++) {
buf[i+n] = key[i]; buf[i+n] = key[i];
} }
for (i=0; i < inlen; i++) { for (i=0; i < inlen; i++) {
buf[keylen + n + i] = in[i]; buf[keylen + n + i] = in[i];
} }
if (n == 32 && XMSS_FUNC == XMSS_SHA2) { if (n == 32 && XMSS_FUNC == XMSS_SHA2) {
SHA256(buf, inlen + keylen + n, out); SHA256(buf, inlen + keylen + n, out);
} }
else if (n == 32 && XMSS_FUNC == XMSS_SHAKE) { else if (n == 32 && XMSS_FUNC == XMSS_SHAKE) {
shake128(out, 32, buf, inlen + keylen + n); shake128(out, 32, buf, inlen + keylen + n);
} }
else if (n == 64 && XMSS_FUNC == XMSS_SHA2) { else if (n == 64 && XMSS_FUNC == XMSS_SHA2) {
SHA512(buf, inlen + keylen + n, out); SHA512(buf, inlen + keylen + n, out);
} }
else if (n == 64 && XMSS_FUNC == XMSS_SHAKE) { else if (n == 64 && XMSS_FUNC == XMSS_SHAKE) {
shake256(out, 64, buf, inlen + keylen + n); shake256(out, 64, buf, inlen + keylen + n);
} }
else { else {
return 1; return 1;
} }
return 0; return 0;
} }
/** int prf(unsigned char *out, const unsigned char *in,
* Implements PRF const unsigned char *key, unsigned int keylen)
*/
int prf(unsigned char *out, const unsigned char *in, const unsigned char *key, unsigned int keylen)
{ {
return core_hash(out, 3, key, keylen, in, 32, keylen); return core_hash(out, 3, key, keylen, in, 32, keylen);
} }
/* int h_msg(unsigned char *out,
* Implemts H_msg const unsigned char *in, unsigned long long inlen,
*/ const unsigned char *key, const unsigned int keylen)
int h_msg(unsigned char *out, const unsigned char *in, unsigned long long inlen, const unsigned char *key, const unsigned int keylen)
{ {
if (keylen != 3*XMSS_N){ return core_hash(out, 2, key, keylen, in, inlen, XMSS_N);
fprintf(stderr, "H_msg takes 3n-bit keys, we got n=%d but a keylength of %d.\n", XMSS_N, keylen);
return 1;
}
return core_hash(out, 2, key, keylen, in, inlen, XMSS_N);
} }
/** /**
* We assume the left half is in in[0]...in[n-1] * We assume the left half is in in[0]...in[n-1]
*/ */
int hash_h(unsigned char *out, const unsigned char *in, const unsigned char *pub_seed, uint32_t addr[8]) int hash_h(unsigned char *out, const unsigned char *in,
const unsigned char *pub_seed, uint32_t addr[8])
{ {
unsigned char buf[2*XMSS_N]; unsigned char buf[2*XMSS_N];
unsigned char key[XMSS_N]; unsigned char key[XMSS_N];
unsigned char bitmask[2*XMSS_N]; unsigned char bitmask[2*XMSS_N];
unsigned char byte_addr[32]; unsigned char byte_addr[32];
unsigned int i; unsigned int i;
setKeyAndMask(addr, 0); set_key_and_mask(addr, 0);
addr_to_byte(byte_addr, addr); addr_to_byte(byte_addr, addr);
prf(key, byte_addr, pub_seed, XMSS_N); prf(key, byte_addr, pub_seed, XMSS_N);
// Use MSB order // Use MSB order
setKeyAndMask(addr, 1); set_key_and_mask(addr, 1);
addr_to_byte(byte_addr, addr); addr_to_byte(byte_addr, addr);
prf(bitmask, byte_addr, pub_seed, XMSS_N); prf(bitmask, byte_addr, pub_seed, XMSS_N);
setKeyAndMask(addr, 2); set_key_and_mask(addr, 2);
addr_to_byte(byte_addr, addr); addr_to_byte(byte_addr, addr);
prf(bitmask+XMSS_N, byte_addr, pub_seed, XMSS_N); prf(bitmask+XMSS_N, byte_addr, pub_seed, XMSS_N);
for (i = 0; i < 2*XMSS_N; i++) { for (i = 0; i < 2*XMSS_N; i++) {
buf[i] = in[i] ^ bitmask[i]; buf[i] = in[i] ^ bitmask[i];
} }
return core_hash(out, 1, key, XMSS_N, buf, 2*XMSS_N, XMSS_N); return core_hash(out, 1, key, XMSS_N, buf, 2*XMSS_N, XMSS_N);
} }
int hash_f(unsigned char *out, const unsigned char *in, const unsigned char *pub_seed, uint32_t addr[8]) int hash_f(unsigned char *out, const unsigned char *in,
const unsigned char *pub_seed, uint32_t addr[8])
{ {
unsigned char buf[XMSS_N]; unsigned char buf[XMSS_N];
unsigned char key[XMSS_N]; unsigned char key[XMSS_N];
unsigned char bitmask[XMSS_N]; unsigned char bitmask[XMSS_N];
unsigned char byte_addr[32]; unsigned char byte_addr[32];
unsigned int i; unsigned int i;
setKeyAndMask(addr, 0); set_key_and_mask(addr, 0);
addr_to_byte(byte_addr, addr); addr_to_byte(byte_addr, addr);
prf(key, byte_addr, pub_seed, XMSS_N); prf(key, byte_addr, pub_seed, XMSS_N);
setKeyAndMask(addr, 1); set_key_and_mask(addr, 1);
addr_to_byte(byte_addr, addr); addr_to_byte(byte_addr, addr);
prf(bitmask, byte_addr, pub_seed, XMSS_N); prf(bitmask, byte_addr, pub_seed, XMSS_N);
for (i = 0; i < XMSS_N; i++) { for (i = 0; i < XMSS_N; i++) {
buf[i] = in[i] ^ bitmask[i]; buf[i] = in[i] ^ bitmask[i];
} }
return core_hash(out, 0, key, XMSS_N, buf, XMSS_N, XMSS_N); return core_hash(out, 0, key, XMSS_N, buf, XMSS_N, XMSS_N);
} }

17
hash.h
View File

@ -11,9 +11,18 @@ Public domain.
#define IS_LITTLE_ENDIAN 1 #define IS_LITTLE_ENDIAN 1
unsigned char* addr_to_byte(unsigned char *bytes, const uint32_t addr[8]); unsigned char* addr_to_byte(unsigned char *bytes, const uint32_t addr[8]);
int prf(unsigned char *out, const unsigned char *in, const unsigned char *key, unsigned int keylen);
int h_msg(unsigned char *out,const unsigned char *in,unsigned long long inlen, const unsigned char *key, const unsigned int keylen); int prf(unsigned char *out, const unsigned char *in,
int hash_h(unsigned char *out, const unsigned char *in, const unsigned char *pub_seed, uint32_t addr[8]); const unsigned char *key, unsigned int keylen);
int hash_f(unsigned char *out, const unsigned char *in, const unsigned char *pub_seed, uint32_t addr[8]);
int h_msg(unsigned char *out,
const unsigned char *in, unsigned long long inlen,
const unsigned char *key, const unsigned int keylen);
int hash_h(unsigned char *out, const unsigned char *in,
const unsigned char *pub_seed, uint32_t addr[8]);
int hash_f(unsigned char *out, const unsigned char *in,
const unsigned char *pub_seed, uint32_t addr[8]);
#endif #endif

59
hash_address.c
View File

@ -6,53 +6,54 @@ Public domain.
*/ */
#include <stdint.h> #include <stdint.h>
void setLayerADRS(uint32_t adrs[8], uint32_t layer){ void set_layer_addr(uint32_t addr[8], uint32_t layer) {
adrs[0] = layer; addr[0] = layer;
} }
void setTreeADRS(uint32_t adrs[8], uint64_t tree){ void set_tree_addr(uint32_t addr[8], uint64_t tree) {
adrs[1] = (uint32_t) (tree >> 32); addr[1] = (uint32_t) (tree >> 32);
adrs[2] = (uint32_t) tree; addr[2] = (uint32_t) tree;
} }
void setType(uint32_t adrs[8], uint32_t type){ void set_type(uint32_t addr[8], uint32_t type) {
adrs[3] = type; int i;
int i;
for(i = 4; i < 8; i++){ addr[3] = type;
adrs[i] = 0; for (i = 4; i < 8; i++) {
} addr[i] = 0;
}
} }
void setKeyAndMask(uint32_t adrs[8], uint32_t keyAndMask){ void set_key_and_mask(uint32_t addr[8], uint32_t key_and_mask) {
adrs[7] = keyAndMask; addr[7] = key_and_mask;
} }
// OTS /* These functions are used for OTS addresses. */
void setOTSADRS(uint32_t adrs[8], uint32_t ots){ void set_ots_addr(uint32_t addr[8], uint32_t ots) {
adrs[4] = ots; addr[4] = ots;
} }
void setChainADRS(uint32_t adrs[8], uint32_t chain){ void set_chain_addr(uint32_t addr[8], uint32_t chain) {
adrs[5] = chain; addr[5] = chain;
} }
void setHashADRS(uint32_t adrs[8], uint32_t hash){ void set_hash_addr(uint32_t addr[8], uint32_t hash) {
adrs[6] = hash; addr[6] = hash;
} }
// L-tree /* This function is used for L-trees. */
void setLtreeADRS(uint32_t adrs[8], uint32_t ltree){ void set_ltree_addr(uint32_t addr[8], uint32_t ltree) {
adrs[4] = ltree; addr[4] = ltree;
} }
// Hash Tree & L-tree /* These functions are used for hash tree addresses. */
void setTreeHeight(uint32_t adrs[8], uint32_t treeHeight){ void set_tree_height(uint32_t addr[8], uint32_t treeHeight) {
adrs[5] = treeHeight; addr[5] = treeHeight;
} }
void setTreeIndex(uint32_t adrs[8], uint32_t treeIndex){ void set_tree_index(uint32_t addr[8], uint32_t treeIndex) {
adrs[6] = treeIndex; addr[6] = treeIndex;
} }

29
hash_address.h
View File

@ -7,31 +7,28 @@ Public domain.
#include <stdint.h> #include <stdint.h>
void setLayerADRS(uint32_t adrs[8], uint32_t layer); void set_layer_addr(uint32_t addr[8], uint32_t layer);
void setTreeADRS(uint32_t adrs[8], uint64_t tree); void set_tree_addr(uint32_t addr[8], uint64_t tree);
void setType(uint32_t adrs[8], uint32_t type); void set_type(uint32_t addr[8], uint32_t type);
void setKeyAndMask(uint32_t adrs[8], uint32_t keyAndMask); void set_key_and_mask(uint32_t addr[8], uint32_t key_and_mask);
// OTS /* These functions are used for OTS addresses. */
void setOTSADRS(uint32_t adrs[8], uint32_t ots); void set_ots_addr(uint32_t addr[8], uint32_t ots);
void setChainADRS(uint32_t adrs[8], uint32_t chain); void set_chain_addr(uint32_t addr[8], uint32_t chain);
void setHashADRS(uint32_t adrs[8], uint32_t hash); void set_hash_addr(uint32_t addr[8], uint32_t hash);
// L-tree /* This function is used for L-trees. */
void setLtreeADRS(uint32_t adrs[8], uint32_t ltree); void set_ltree_addr(uint32_t addr[8], uint32_t ltree);
// Hash Tree & L-tree
void setTreeHeight(uint32_t adrs[8], uint32_t treeHeight);
void setTreeIndex(uint32_t adrs[8], uint32_t treeIndex);
/* These functions are used for hash tree addresses. */
void set_tree_height(uint32_t addr[8], uint32_t treeHeight);
void set_tree_index(uint32_t addr[8], uint32_t treeIndex);

49
randombytes.c
View File

@ -2,37 +2,40 @@
This code was taken from the SPHINCS reference implementation and is public domain. This code was taken from the SPHINCS reference implementation and is public domain.
*/ */
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h> #include <fcntl.h>
#include <unistd.h> #include <unistd.h>
/* it's really stupid that there isn't a syscall for this */
static int fd = -1; static int fd = -1;
void randombytes(unsigned char *x, unsigned long long xlen) void randombytes(unsigned char *x, unsigned long long xlen)
{ {
int i; int i;
if (fd == -1) { if (fd == -1) {
for (;;) { for (;;) {
fd = open("/dev/urandom", O_RDONLY); fd = open("/dev/urandom", O_RDONLY);
if (fd != -1) break; if (fd != -1) {
sleep(1); break;
} }
} sleep(1);
}
while (xlen > 0) {
if (xlen < 1048576) i = xlen; else i = 1048576;
i = read(fd, x, i);
if (i < 1) {
sleep(1);
continue;
} }
x += i; while (xlen > 0) {
xlen -= i; if (xlen < 1048576) {
} i = xlen;
}
else {
i = 1048576;
}
i = read(fd, x, i);
if (i < 1) {
sleep(1);
continue;
}
x += i;
xlen -= i;
}
} }

2
test/test_wots.c
View File

@ -34,7 +34,7 @@ int main()
wots_pkgen(pk1, seed, pub_seed, addr); wots_pkgen(pk1, seed, pub_seed, addr);
wots_sign(sig, msg, seed, pub_seed, addr); wots_sign(sig, msg, seed, pub_seed, addr);
wots_pkFromSig(pk2, sig, msg, pub_seed, addr); wots_pk_from_sig(pk2, sig, msg, pub_seed, addr);
for (i = 0; i < sig_len; i++) for (i = 0; i < sig_len; i++)
if (pk1[i] != pk2[i]) { if (pk1[i] != pk2[i]) {

178
wots.c
View File

@ -5,9 +5,7 @@ Joost Rijneveld
Public domain. Public domain.
*/ */
#include "math.h" #include <stdint.h>
#include "stdio.h"
#include "stdint.h"
#include "xmss_commons.h" #include "xmss_commons.h"
#include "hash.h" #include "hash.h"
#include "wots.h" #include "wots.h"
@ -21,12 +19,13 @@ Public domain.
*/ */
static void expand_seed(unsigned char *outseeds, const unsigned char *inseed) static void expand_seed(unsigned char *outseeds, const unsigned char *inseed)
{ {
uint32_t i = 0; uint32_t i;
unsigned char ctr[32]; unsigned char ctr[32];
for(i = 0; i < XMSS_WOTS_LEN; i++){
to_byte(ctr, i, 32); for (i = 0; i < XMSS_WOTS_LEN; i++) {
prf(outseeds + i*XMSS_N, ctr, inseed, XMSS_N); to_byte(ctr, i, 32);
} prf(outseeds + i*XMSS_N, ctr, inseed, XMSS_N);
}
} }
/** /**
@ -36,115 +35,120 @@ static void expand_seed(unsigned char *outseeds, const unsigned char *inseed)
* interpretes in as start-th value of the chain * interpretes in as start-th value of the chain
* addr has to contain the address of the chain * addr has to contain the address of the chain
*/ */
static void gen_chain(unsigned char *out, const unsigned char *in, unsigned int start, unsigned int steps, const unsigned char *pub_seed, uint32_t addr[8]) static void gen_chain(unsigned char *out, const unsigned char *in,
unsigned int start, unsigned int steps,
const unsigned char *pub_seed, uint32_t addr[8])
{ {
uint32_t i, j; uint32_t i;
for (j = 0; j < XMSS_N; j++)
out[j] = in[j];
for (i = start; i < (start+steps) && i < XMSS_WOTS_W; i++) { for (i = 0; i < XMSS_N; i++) {
setHashADRS(addr, i); out[i] = in[i];
hash_f(out, out, pub_seed, addr); }
}
for (i = start; i < (start+steps) && i < XMSS_WOTS_W; i++) {
set_hash_addr(addr, i);
hash_f(out, out, pub_seed, addr);
}
} }
/** /**
* base_w algorithm as described in draft. * base_w algorithm as described in draft.
*
*
*/ */
static void base_w(int *output, const int out_len, const unsigned char *input) static void base_w(int *output, const int out_len, const unsigned char *input)
{ {
int in = 0; int in = 0;
int out = 0; int out = 0;
uint8_t total = 0; uint8_t total = 0;
int bits = 0; int bits = 0;
int consumed = 0; int i;
for (consumed = 0; consumed < out_len; consumed++) { for (i = 0; i < out_len; i++) {
if (bits == 0) { if (bits == 0) {
total = input[in]; total = input[in];
in++; in++;
bits += 8; bits += 8;
}
bits -= XMSS_WOTS_LOG_W;
output[out] = (total >> bits) & (XMSS_WOTS_W - 1);
out++;
} }
bits -= XMSS_WOTS_LOG_W;
output[out] = (total >> bits) & (XMSS_WOTS_W - 1);
out++;
}
} }
void wots_pkgen(unsigned char *pk, const unsigned char *sk, const unsigned char *pub_seed, uint32_t addr[8]) void wots_pkgen(unsigned char *pk, const unsigned char *sk,
const unsigned char *pub_seed, uint32_t addr[8])
{ {
uint32_t i; uint32_t i;
expand_seed(pk, sk);
for (i=0; i < XMSS_WOTS_LEN; i++) { expand_seed(pk, sk);
setChainADRS(addr, i); for (i = 0; i < XMSS_WOTS_LEN; i++) {
gen_chain(pk+i*XMSS_N, pk+i*XMSS_N, 0, XMSS_WOTS_W-1, pub_seed, addr); set_chain_addr(addr, i);
} gen_chain(pk + i*XMSS_N, pk + i*XMSS_N,
0, XMSS_WOTS_W-1, pub_seed, addr);
}
} }
void wots_sign(unsigned char *sig, const unsigned char *msg, const unsigned char *sk, const unsigned char *pub_seed, uint32_t addr[8]) void wots_sign(unsigned char *sig, const unsigned char *msg,
const unsigned char *sk, const unsigned char *pub_seed,
uint32_t addr[8])
{ {
int basew[XMSS_WOTS_LEN]; int basew[XMSS_WOTS_LEN];
int csum = 0; int csum = 0;
uint32_t i = 0; unsigned char csum_bytes[((XMSS_WOTS_LEN2 * XMSS_WOTS_LOG_W) + 7) / 8];
int csum_basew[XMSS_WOTS_LEN2];
uint32_t i;
base_w(basew, XMSS_WOTS_LEN1, msg); base_w(basew, XMSS_WOTS_LEN1, msg);
for (i=0; i < XMSS_WOTS_LEN1; i++) { for (i = 0; i < XMSS_WOTS_LEN1; i++) {
csum += XMSS_WOTS_W - 1 - basew[i]; csum += XMSS_WOTS_W - 1 - basew[i];
} }
csum = csum << (8 - ((XMSS_WOTS_LEN2 * XMSS_WOTS_LOG_W) % 8)); csum = csum << (8 - ((XMSS_WOTS_LEN2 * XMSS_WOTS_LOG_W) % 8));
int len_2_bytes = ((XMSS_WOTS_LEN2 * XMSS_WOTS_LOG_W) + 7) / 8; to_byte(csum_bytes, csum, ((XMSS_WOTS_LEN2 * XMSS_WOTS_LOG_W) + 7) / 8);
base_w(csum_basew, XMSS_WOTS_LEN2, csum_bytes);
unsigned char csum_bytes[len_2_bytes]; for (i = 0; i < XMSS_WOTS_LEN2; i++) {
to_byte(csum_bytes, csum, len_2_bytes); basew[XMSS_WOTS_LEN1 + i] = csum_basew[i];
}
int csum_basew[XMSS_WOTS_LEN2]; expand_seed(sig, sk);
base_w(csum_basew, XMSS_WOTS_LEN2, csum_bytes);
for (i = 0; i < XMSS_WOTS_LEN2; i++) { for (i = 0; i < XMSS_WOTS_LEN; i++) {
basew[XMSS_WOTS_LEN1 + i] = csum_basew[i]; set_chain_addr(addr, i);
} gen_chain(sig + i*XMSS_N, sig + i*XMSS_N,
0, basew[i], pub_seed, addr);
expand_seed(sig, sk); }
for (i = 0; i < XMSS_WOTS_LEN; i++) {
setChainADRS(addr, i);
gen_chain(sig+i*XMSS_N, sig+i*XMSS_N, 0, basew[i], pub_seed, addr);
}
} }
void wots_pkFromSig(unsigned char *pk, const unsigned char *sig, const unsigned char *msg, const unsigned char *pub_seed, uint32_t addr[8]) void wots_pk_from_sig(unsigned char *pk,
const unsigned char *sig, const unsigned char *msg,
const unsigned char *pub_seed, uint32_t addr[8])
{ {
int basew[XMSS_WOTS_LEN]; int basew[XMSS_WOTS_LEN];
int csum = 0; int csum = 0;
uint32_t i = 0; unsigned char csum_bytes[((XMSS_WOTS_LEN2 * XMSS_WOTS_LOG_W) + 7) / 8];
int csum_basew[XMSS_WOTS_LEN2];
uint32_t i = 0;
base_w(basew, XMSS_WOTS_LEN1, msg); base_w(basew, XMSS_WOTS_LEN1, msg);
for (i=0; i < XMSS_WOTS_LEN1; i++) { for (i=0; i < XMSS_WOTS_LEN1; i++) {
csum += XMSS_WOTS_W - 1 - basew[i]; csum += XMSS_WOTS_W - 1 - basew[i];
} }
csum = csum << (8 - ((XMSS_WOTS_LEN2 * XMSS_WOTS_LOG_W) % 8)); csum = csum << (8 - ((XMSS_WOTS_LEN2 * XMSS_WOTS_LOG_W) % 8));
int len_2_bytes = ((XMSS_WOTS_LEN2 * XMSS_WOTS_LOG_W) + 7) / 8; to_byte(csum_bytes, csum, ((XMSS_WOTS_LEN2 * XMSS_WOTS_LOG_W) + 7) / 8);
base_w(csum_basew, XMSS_WOTS_LEN2, csum_bytes);
unsigned char csum_bytes[len_2_bytes]; for (i = 0; i < XMSS_WOTS_LEN2; i++) {
to_byte(csum_bytes, csum, len_2_bytes); basew[XMSS_WOTS_LEN1 + i] = csum_basew[i];
}
int csum_basew[XMSS_WOTS_LEN2]; for (i=0; i < XMSS_WOTS_LEN; i++) {
base_w(csum_basew, XMSS_WOTS_LEN2, csum_bytes); set_chain_addr(addr, i);
gen_chain(pk + i*XMSS_N, sig + i*XMSS_N,
for (i = 0; i < XMSS_WOTS_LEN2; i++) { basew[i], XMSS_WOTS_W-1-basew[i], pub_seed, addr);
basew[XMSS_WOTS_LEN1 + i] = csum_basew[i]; }
}
for (i=0; i < XMSS_WOTS_LEN; i++) {
setChainADRS(addr, i);
gen_chain(pk+i*XMSS_N, sig+i*XMSS_N, basew[i], XMSS_WOTS_W-1-basew[i], pub_seed, addr);
}
} }

13
wots.h
View File

@ -16,18 +16,21 @@ Public domain.
* *
* Places the computed public key at address pk. * Places the computed public key at address pk.
*/ */
void wots_pkgen(unsigned char *pk, const unsigned char *sk, const unsigned char *pub_seed, uint32_t addr[8]); void wots_pkgen(unsigned char *pk, const unsigned char *sk,
const unsigned char *pub_seed, uint32_t addr[8]);
/** /**
* Takes a m-byte message and the 32-byte seed for the secret key to compute a signature that is placed at "sig". * Takes a m-byte message and the 32-byte seed for the secret key to compute a signature that is placed at "sig".
*
*/ */
void wots_sign(unsigned char *sig, const unsigned char *msg, const unsigned char *sk, const unsigned char *pub_seed, uint32_t addr[8]); void wots_sign(unsigned char *sig, const unsigned char *msg,
const unsigned char *sk, const unsigned char *pub_seed,
uint32_t addr[8]);
/** /**
* Takes a WOTS signature, a m-byte message and computes a WOTS public key that it places at pk. * Takes a WOTS signature, a m-byte message and computes a WOTS public key that it places at pk.
*
*/ */
void wots_pkFromSig(unsigned char *pk, const unsigned char *sig, const unsigned char *msg, const unsigned char *pub_seed, uint32_t addr[8]); void wots_pk_from_sig(unsigned char *pk,
const unsigned char *sig, const unsigned char *msg,
const unsigned char *pub_seed, uint32_t addr[8]);
#endif #endif

17
xmss.c
View File

@ -1,4 +1,5 @@
#include <stdint.h> #include <stdint.h>
#include "params_runtime.h" #include "params_runtime.h"
#include "xmss_core.h" #include "xmss_core.h"
@ -23,8 +24,8 @@ int xmss_keypair(unsigned char *pk, unsigned char *sk, const uint32_t oid)
} }
int xmss_sign(unsigned char *sk, int xmss_sign(unsigned char *sk,
unsigned char *sm, unsigned long long *smlen, unsigned char *sm, unsigned long long *smlen,
const unsigned char *m, unsigned long long mlen) const unsigned char *m, unsigned long long mlen)
{ {
uint32_t oid = 0; uint32_t oid = 0;
unsigned int i; unsigned int i;
@ -39,8 +40,8 @@ int xmss_sign(unsigned char *sk,
} }
int xmss_sign_open(unsigned char *m, unsigned long long *mlen, int xmss_sign_open(unsigned char *m, unsigned long long *mlen,
const unsigned char *sm, unsigned long long smlen, const unsigned char *sm, unsigned long long smlen,
const unsigned char *pk) const unsigned char *pk)
{ {
uint32_t oid = 0; uint32_t oid = 0;
unsigned int i; unsigned int i;
@ -69,8 +70,8 @@ int xmssmt_keypair(unsigned char *pk, unsigned char *sk, const uint32_t oid)
} }
int xmssmt_sign(unsigned char *sk, int xmssmt_sign(unsigned char *sk,
unsigned char *sm, unsigned long long *smlen, unsigned char *sm, unsigned long long *smlen,
const unsigned char *m, unsigned long long mlen) const unsigned char *m, unsigned long long mlen)
{ {
uint32_t oid = 0; uint32_t oid = 0;
unsigned int i; unsigned int i;
@ -85,8 +86,8 @@ int xmssmt_sign(unsigned char *sk,
} }
int xmssmt_sign_open(unsigned char *m, unsigned long long *mlen, int xmssmt_sign_open(unsigned char *m, unsigned long long *mlen,
const unsigned char *sm, unsigned long long smlen, const unsigned char *sm, unsigned long long smlen,
const unsigned char *pk) const unsigned char *pk)
{ {
uint32_t oid = 0; uint32_t oid = 0;
unsigned int i; unsigned int i;

21
xmss.h
View File

@ -9,19 +9,25 @@
* Format pk: [oid || root || PUB_SEED] * Format pk: [oid || root || PUB_SEED]
*/ */
int xmss_keypair(unsigned char *pk, unsigned char *sk, const uint32_t oid); int xmss_keypair(unsigned char *pk, unsigned char *sk, const uint32_t oid);
/** /**
* Signs a message. * Signs a message.
* Returns * Returns
* 1. an array containing the signature followed by the message AND * 1. an array containing the signature followed by the message AND
* 2. an updated secret key! * 2. an updated secret key!
*/ */
int xmss_sign(unsigned char *sk, unsigned char *sig_msg, unsigned long long *sig_msg_len, const unsigned char *msg, unsigned long long msglen); int xmss_sign(unsigned char *sk,
unsigned char *sm, unsigned long long *smlen,
const unsigned char *m, unsigned long long mlen);
/** /**
* Verifies a given message signature pair under a given public key. * Verifies a given message signature pair under a given public key.
* *
* Note: msg and msglen are pure outputs which carry the message in case verification succeeds. The (input) message is assumed to be within sig_msg which has the form (sig||msg). * Note: msg and msglen are pure outputs which carry the message in case verification succeeds. The (input) message is assumed to be within sig_msg which has the form (sig||msg).
*/ */
int xmss_sign_open(unsigned char *msg, unsigned long long *msglen, const unsigned char *sig_msg, unsigned long long sig_msg_len, const unsigned char *pk); int xmss_sign_open(unsigned char *m, unsigned long long *mlen,
const unsigned char *sm, unsigned long long smlen,
const unsigned char *pk);
/* /*
* Generates a XMSSMT key pair for a given parameter set. * Generates a XMSSMT key pair for a given parameter set.
@ -29,16 +35,21 @@ int xmss_sign_open(unsigned char *msg, unsigned long long *msglen, const unsigne
* Format pk: [oid || root || PUB_SEED] * Format pk: [oid || root || PUB_SEED]
*/ */
int xmssmt_keypair(unsigned char *pk, unsigned char *sk, const uint32_t oid); int xmssmt_keypair(unsigned char *pk, unsigned char *sk, const uint32_t oid);
/** /**
* Signs a message. * Signs a message.
* Returns * Returns
* 1. an array containing the signature followed by the message AND * 1. an array containing the signature followed by the message AND
* 2. an updated secret key! * 2. an updated secret key!
*/ */
int xmssmt_sign(unsigned char *sk, unsigned char *sig_msg, unsigned long long *sig_msg_len, const unsigned char *msg, unsigned long long msglen); int xmssmt_sign(unsigned char *sk,
unsigned char *sm, unsigned long long *smlen,
const unsigned char *m, unsigned long long mlen);
/** /**
* Verifies a given message signature pair under a given public key. * Verifies a given message signature pair under a given public key.
*/ */
int xmssmt_sign_open(unsigned char *msg, unsigned long long *msglen, const unsigned char *sig_msg, unsigned long long sig_msg_len, const unsigned char *pk); int xmssmt_sign_open(unsigned char *m, unsigned long long *mlen,
const unsigned char *sm, unsigned long long smlen,
const unsigned char *pk);
#endif #endif

506
xmss_commons.c
View File

@ -5,38 +5,40 @@ Joost Rijneveld
Public domain. Public domain.
*/ */
#include "xmss_commons.h"
#include <stdlib.h> #include <stdlib.h>
#include <string.h> #include <string.h>
#include <stdint.h> #include <stdint.h>
#include "wots.h"
#include "hash.h" #include "hash.h"
#include "hash_address.h" #include "hash_address.h"
#include "params.h" #include "params.h"
#include "wots.h"
#include "xmss_commons.h"
void to_byte(unsigned char *out, unsigned long long in, uint32_t bytes) void to_byte(unsigned char *out, unsigned long long in, uint32_t bytes)
{ {
int32_t i; int i;
for (i = bytes-1; i >= 0; i--) {
out[i] = in & 0xff; for (i = bytes-1; i >= 0; i--) {
in = in >> 8; out[i] = in & 0xff;
} in = in >> 8;
}
} }
/** /**
* Computes the leaf at a given address. First generates the WOTS key pair, then computes leaf using l_tree. As this happens position independent, we only require that addr encodes the right ltree-address. * Computes the leaf at a given address. First generates the WOTS key pair, then computes leaf using l_tree. As this happens position independent, we only require that addr encodes the right ltree-address.
*/ */
void gen_leaf_wots(unsigned char *leaf, const unsigned char *sk_seed, const unsigned char *pub_seed, uint32_t ltree_addr[8], uint32_t ots_addr[8]) void gen_leaf_wots(unsigned char *leaf,
const unsigned char *sk_seed, const unsigned char *pub_seed,
uint32_t ltree_addr[8], uint32_t ots_addr[8])
{ {
unsigned char seed[XMSS_N]; unsigned char seed[XMSS_N];
unsigned char pk[XMSS_WOTS_KEYSIZE]; unsigned char pk[XMSS_WOTS_KEYSIZE];
get_seed(seed, sk_seed, ots_addr); get_seed(seed, sk_seed, ots_addr);
wots_pkgen(pk, seed, pub_seed, ots_addr); wots_pkgen(pk, seed, pub_seed, ots_addr);
l_tree(leaf, pk, pub_seed, ltree_addr); l_tree(leaf, pk, pub_seed, ltree_addr);
} }
/** /**
@ -45,316 +47,260 @@ void gen_leaf_wots(unsigned char *leaf, const unsigned char *sk_seed, const unsi
* *
* takes XMSS_N byte sk_seed and returns XMSS_N byte seed using 32 byte address addr. * takes XMSS_N byte sk_seed and returns XMSS_N byte seed using 32 byte address addr.
*/ */
void get_seed(unsigned char *seed, const unsigned char *sk_seed, uint32_t addr[8]) void get_seed(unsigned char *seed,
const unsigned char *sk_seed, uint32_t addr[8])
{ {
unsigned char bytes[32]; unsigned char bytes[32];
// Make sure that chain addr, hash addr, and key bit are 0!
setChainADRS(addr, 0); // Make sure that chain addr, hash addr, and key bit are 0!
setHashADRS(addr, 0); set_chain_addr(addr, 0);
setKeyAndMask(addr, 0); set_hash_addr(addr, 0);
// Generate pseudorandom value set_key_and_mask(addr, 0);
addr_to_byte(bytes, addr); // Generate pseudorandom value
prf(seed, bytes, sk_seed, XMSS_N); addr_to_byte(bytes, addr);
prf(seed, bytes, sk_seed, XMSS_N);
} }
/** /**
* Computes a leaf from a WOTS public key using an L-tree. * Computes a leaf from a WOTS public key using an L-tree.
*/ */
void l_tree(unsigned char *leaf, unsigned char *wots_pk, const unsigned char *pub_seed, uint32_t addr[8]) void l_tree(unsigned char *leaf, unsigned char *wots_pk,
const unsigned char *pub_seed, uint32_t addr[8])
{ {
unsigned int l = XMSS_WOTS_LEN; unsigned int l = XMSS_WOTS_LEN;
uint32_t i = 0; uint32_t i = 0;
uint32_t height = 0; uint32_t height = 0;
uint32_t bound; uint32_t bound;
//ADRS.setTreeHeight(0); set_tree_height(addr, height);
setTreeHeight(addr, height);
while (l > 1) { while (l > 1) {
bound = l >> 1; //floor(l / 2); bound = l >> 1;
for (i = 0; i < bound; i++) { for (i = 0; i < bound; i++) {
//ADRS.setTreeIndex(i); set_tree_index(addr, i);
setTreeIndex(addr, i); hash_h(wots_pk + i*XMSS_N, wots_pk + i*2*XMSS_N, pub_seed, addr);
//wots_pk[i] = RAND_HASH(pk[2i], pk[2i + 1], SEED, ADRS); }
hash_h(wots_pk+i*XMSS_N, wots_pk+i*2*XMSS_N, pub_seed, addr); if (l & 1) {
} memcpy(wots_pk + (l >> 1)*XMSS_N, wots_pk + (l - 1)*XMSS_N, XMSS_N);
//if ( l % 2 == 1 ) { l = (l >> 1) + 1;
if (l & 1) { }
//pk[floor(l / 2) + 1] = pk[l]; else {
memcpy(wots_pk+(l>>1)*XMSS_N, wots_pk+(l-1)*XMSS_N, XMSS_N); l = l >> 1;
//l = ceil(l / 2); }
l=(l>>1)+1; height++;
} set_tree_height(addr, height);
else { }
//l = ceil(l / 2); memcpy(leaf, wots_pk, XMSS_N);
l=(l>>1);
}
//ADRS.setTreeHeight(ADRS.getTreeHeight() + 1);
height++;
setTreeHeight(addr, height);
}
//return pk[0];
memcpy(leaf, wots_pk, XMSS_N);
} }
/** /**
* Computes a root node given a leaf and an authapth * Computes a root node given a leaf and an authapth
*/ */
static void validate_authpath(unsigned char *root, const unsigned char *leaf, unsigned long leafidx, const unsigned char *authpath, const unsigned char *pub_seed, uint32_t addr[8]) static void validate_authpath(unsigned char *root,
const unsigned char *leaf, unsigned long leafidx,
const unsigned char *authpath,
const unsigned char *pub_seed, uint32_t addr[8])
{ {
uint32_t i, j; uint32_t i, j;
unsigned char buffer[2*XMSS_N]; unsigned char buffer[2*XMSS_N];
// If leafidx is odd (last bit = 1), current path element is a right child and authpath has to go to the left. // If leafidx is odd (last bit = 1), current path element is a right child and authpath has to go to the left.
// Otherwise, it is the other way around // Otherwise, it is the other way around
if (leafidx & 1) { if (leafidx & 1) {
for (j = 0; j < XMSS_N; j++) for (j = 0; j < XMSS_N; j++) {
buffer[XMSS_N+j] = leaf[j]; buffer[XMSS_N + j] = leaf[j];
for (j = 0; j < XMSS_N; j++) buffer[j] = authpath[j];
buffer[j] = authpath[j]; }
}
else {
for (j = 0; j < XMSS_N; j++)
buffer[j] = leaf[j];
for (j = 0; j < XMSS_N; j++)
buffer[XMSS_N+j] = authpath[j];
}
authpath += XMSS_N;
for (i = 0; i < XMSS_TREEHEIGHT-1; i++) {
setTreeHeight(addr, i);
leafidx >>= 1;
setTreeIndex(addr, leafidx);
if (leafidx&1) {
hash_h(buffer+XMSS_N, buffer, pub_seed, addr);
for (j = 0; j < XMSS_N; j++)
buffer[j] = authpath[j];
} }
else { else {
hash_h(buffer, buffer, pub_seed, addr); for (j = 0; j < XMSS_N; j++) {
for (j = 0; j < XMSS_N; j++) buffer[j] = leaf[j];
buffer[j+XMSS_N] = authpath[j]; buffer[XMSS_N + j] = authpath[j];
}
} }
authpath += XMSS_N; authpath += XMSS_N;
}
setTreeHeight(addr, (XMSS_TREEHEIGHT-1)); for (i = 0; i < XMSS_TREEHEIGHT-1; i++) {
leafidx >>= 1; set_tree_height(addr, i);
setTreeIndex(addr, leafidx); leafidx >>= 1;
hash_h(root, buffer, pub_seed, addr); set_tree_index(addr, leafidx);
if (leafidx & 1) {
hash_h(buffer + XMSS_N, buffer, pub_seed, addr);
for (j = 0; j < XMSS_N; j++) {
buffer[j] = authpath[j];
}
}
else {
hash_h(buffer, buffer, pub_seed, addr);
for (j = 0; j < XMSS_N; j++) {
buffer[j + XMSS_N] = authpath[j];
}
}
authpath += XMSS_N;
}
set_tree_height(addr, XMSS_TREEHEIGHT - 1);
leafidx >>= 1;
set_tree_index(addr, leafidx);
hash_h(root, buffer, pub_seed, addr);
} }
/** /**
* Verifies a given message signature pair under a given public key. * Verifies a given message signature pair under a given public key.
*/ */
int xmss_core_sign_open(unsigned char *m, unsigned long long *mlen, const unsigned char *sm, unsigned long long smlen, const unsigned char *pk) int xmss_core_sign_open(unsigned char *m, unsigned long long *mlen,
const unsigned char *sm, unsigned long long smlen,
const unsigned char *pk)
{ {
unsigned long long i, m_len; unsigned long long i;
unsigned long idx=0; unsigned long idx = 0;
unsigned char wots_pk[XMSS_WOTS_KEYSIZE]; unsigned char wots_pk[XMSS_WOTS_KEYSIZE];
unsigned char pkhash[XMSS_N]; unsigned char pkhash[XMSS_N];
unsigned char root[XMSS_N]; unsigned char root[XMSS_N];
unsigned char msg_h[XMSS_N]; unsigned char msg_h[XMSS_N];
unsigned char hash_key[3*XMSS_N]; unsigned char hash_key[3*XMSS_N];
unsigned char pub_seed[XMSS_N]; unsigned char pub_seed[XMSS_N];
memcpy(pub_seed, pk+XMSS_N, XMSS_N); memcpy(pub_seed, pk + XMSS_N, XMSS_N);
// Init addresses // Init addresses
uint32_t ots_addr[8] = {0, 0, 0, 0, 0, 0, 0, 0}; uint32_t ots_addr[8] = {0};
uint32_t ltree_addr[8] = {0, 0, 0, 0, 0, 0, 0, 0}; uint32_t ltree_addr[8] = {0};
uint32_t node_addr[8] = {0, 0, 0, 0, 0, 0, 0, 0}; uint32_t node_addr[8] = {0};
setType(ots_addr, 0); set_type(ots_addr, 0);
setType(ltree_addr, 1); set_type(ltree_addr, 1);
setType(node_addr, 2); set_type(node_addr, 2);
// Extract index *mlen = smlen - XMSS_BYTES;
idx = ((unsigned long)sm[0] << 24) | ((unsigned long)sm[1] << 16) | ((unsigned long)sm[2] << 8) | sm[3];
// Generate hash key (R || root || idx) // Extract index
memcpy(hash_key, sm+4,XMSS_N); for (i = 0; i < XMSS_INDEX_LEN; i++) {
memcpy(hash_key+XMSS_N, pk, XMSS_N); idx |= ((unsigned long long)sm[i]) << (8*(XMSS_INDEX_LEN - 1 - i));
to_byte(hash_key+2*XMSS_N, idx, XMSS_N); }
sm += (XMSS_N+4); // Generate hash key (R || root || idx)
smlen -= (XMSS_N+4); memcpy(hash_key, sm + XMSS_INDEX_LEN, XMSS_N);
memcpy(hash_key + XMSS_N, pk, XMSS_N);
to_byte(hash_key + 2*XMSS_N, idx, XMSS_N);
// hash message
h_msg(msg_h, sm + XMSS_BYTES, *mlen, hash_key, 3*XMSS_N);
sm += XMSS_INDEX_LEN + XMSS_N;
// hash message
unsigned long long tmp_sig_len = XMSS_WOTS_KEYSIZE+XMSS_TREEHEIGHT*XMSS_N;
m_len = smlen - tmp_sig_len;
h_msg(msg_h, sm + tmp_sig_len, m_len, hash_key, 3*XMSS_N);
//-----------------------
// Verify signature
//-----------------------
// Prepare Address
setOTSADRS(ots_addr, idx);
// Check WOTS signature
wots_pkFromSig(wots_pk, sm, msg_h, pub_seed, ots_addr);
sm += XMSS_WOTS_KEYSIZE;
smlen -= XMSS_WOTS_KEYSIZE;
// Compute Ltree
setLtreeADRS(ltree_addr, idx);
l_tree(pkhash, wots_pk, pub_seed, ltree_addr);
// Compute root
validate_authpath(root, pkhash, idx, sm, pub_seed, node_addr);
sm += XMSS_TREEHEIGHT*XMSS_N;
smlen -= XMSS_TREEHEIGHT*XMSS_N;
for (i = 0; i < XMSS_N; i++)
if (root[i] != pk[i])
goto fail;
*mlen = smlen;
for (i = 0; i < *mlen; i++)
m[i] = sm[i];
return 0;
fail:
*mlen = smlen;
for (i = 0; i < *mlen; i++)
m[i] = 0;
*mlen = -1;
return -1;
}
/**
* Verifies a given message signature pair under a given public key.
*/
int xmssmt_core_sign_open(unsigned char *m, unsigned long long *mlen, const unsigned char *sm, unsigned long long smlen, const unsigned char *pk)
{
uint64_t idx_tree;
uint32_t idx_leaf;
unsigned long long i, m_len;
unsigned long long idx=0;
unsigned char wots_pk[XMSS_WOTS_KEYSIZE];
unsigned char pkhash[XMSS_N];
unsigned char root[XMSS_N];
unsigned char msg_h[XMSS_N];
unsigned char hash_key[3*XMSS_N];
unsigned char pub_seed[XMSS_N];
memcpy(pub_seed, pk+XMSS_N, XMSS_N);
// Init addresses
uint32_t ots_addr[8] = {0, 0, 0, 0, 0, 0, 0, 0};
uint32_t ltree_addr[8] = {0, 0, 0, 0, 0, 0, 0, 0};
uint32_t node_addr[8] = {0, 0, 0, 0, 0, 0, 0, 0};
// Extract index
for (i = 0; i < XMSS_INDEX_LEN; i++) {
idx |= ((unsigned long long)sm[i]) << (8*(XMSS_INDEX_LEN - 1 - i));
}
sm += XMSS_INDEX_LEN;
smlen -= XMSS_INDEX_LEN;
// Generate hash key (R || root || idx)
memcpy(hash_key, sm,XMSS_N);
memcpy(hash_key+XMSS_N, pk, XMSS_N);
to_byte(hash_key+2*XMSS_N, idx, XMSS_N);
sm += XMSS_N;
smlen -= XMSS_N;
// hash message
unsigned long long tmp_sig_len = (XMSS_D * XMSS_WOTS_KEYSIZE) + (XMSS_FULLHEIGHT * XMSS_N);
m_len = smlen - tmp_sig_len;
h_msg(msg_h, sm + tmp_sig_len, m_len, hash_key, 3*XMSS_N);
//-----------------------
// Verify signature
//-----------------------
// Prepare Address
idx_tree = idx >> XMSS_TREEHEIGHT;
idx_leaf = (idx & ((1 << XMSS_TREEHEIGHT)-1));
setLayerADRS(ots_addr, 0);
setTreeADRS(ots_addr, idx_tree);
setType(ots_addr, 0);
memcpy(ltree_addr, ots_addr, 12);
setType(ltree_addr, 1);
memcpy(node_addr, ltree_addr, 12);
setType(node_addr, 2);
setOTSADRS(ots_addr, idx_leaf);
// Check WOTS signature
wots_pkFromSig(wots_pk, sm, msg_h, pub_seed, ots_addr);
sm += XMSS_WOTS_KEYSIZE;
smlen -= XMSS_WOTS_KEYSIZE;
// Compute Ltree
setLtreeADRS(ltree_addr, idx_leaf);
l_tree(pkhash, wots_pk, pub_seed, ltree_addr);
// Compute root
validate_authpath(root, pkhash, idx_leaf, sm, pub_seed, node_addr);
sm += XMSS_TREEHEIGHT*XMSS_N;
smlen -= XMSS_TREEHEIGHT*XMSS_N;
for (i = 1; i < XMSS_D; i++) {
// Prepare Address // Prepare Address
idx_leaf = (idx_tree & ((1 << XMSS_TREEHEIGHT)-1)); set_ots_addr(ots_addr, idx);
idx_tree = idx_tree >> XMSS_TREEHEIGHT;
setLayerADRS(ots_addr, i);
setTreeADRS(ots_addr, idx_tree);
setType(ots_addr, 0);
memcpy(ltree_addr, ots_addr, 12);
setType(ltree_addr, 1);
memcpy(node_addr, ltree_addr, 12);
setType(node_addr, 2);
setOTSADRS(ots_addr, idx_leaf);
// Check WOTS signature // Check WOTS signature
wots_pkFromSig(wots_pk, sm, root, pub_seed, ots_addr); wots_pk_from_sig(wots_pk, sm, msg_h, pub_seed, ots_addr);
sm += XMSS_WOTS_KEYSIZE; sm += XMSS_WOTS_KEYSIZE;
smlen -= XMSS_WOTS_KEYSIZE;
// Compute Ltree // Compute Ltree
setLtreeADRS(ltree_addr, idx_leaf); set_ltree_addr(ltree_addr, idx);
l_tree(pkhash, wots_pk, pub_seed, ltree_addr); l_tree(pkhash, wots_pk, pub_seed, ltree_addr);
// Compute root // Compute root
validate_authpath(root, pkhash, idx_leaf, sm, pub_seed, node_addr); validate_authpath(root, pkhash, idx, sm, pub_seed, node_addr);
sm += XMSS_TREEHEIGHT*XMSS_N; sm += XMSS_TREEHEIGHT*XMSS_N;
smlen -= XMSS_TREEHEIGHT*XMSS_N;
} for (i = 0; i < XMSS_N; i++) {
if (root[i] != pk[i]) {
for (i = 0; i < *mlen; i++) {
m[i] = 0;
}
*mlen = -1;
return -1;
}
}
for (i = 0; i < XMSS_N; i++) for (i = 0; i < *mlen; i++) {
if (root[i] != pk[i]) m[i] = sm[i];
goto fail; }
*mlen = smlen; return 0;
for (i = 0; i < *mlen; i++) }
m[i] = sm[i];
/**
return 0; * Verifies a given message signature pair under a given public key.
*/
int xmssmt_core_sign_open(unsigned char *m, unsigned long long *mlen,
fail: const unsigned char *sm, unsigned long long smlen,
*mlen = smlen; const unsigned char *pk)
for (i = 0; i < *mlen; i++) {
m[i] = 0; uint32_t idx_leaf;
*mlen = -1; unsigned long long i;
return -1; unsigned long long idx = 0;
unsigned char wots_pk[XMSS_WOTS_KEYSIZE];
unsigned char pkhash[XMSS_N];
unsigned char root[XMSS_N];
unsigned char *msg_h = root;
unsigned char hash_key[3*XMSS_N];
const unsigned char *pub_seed = pk + XMSS_N;
// Init addresses
uint32_t ots_addr[8] = {0};
uint32_t ltree_addr[8] = {0};
uint32_t node_addr[8] = {0};
set_type(ots_addr, 0);
set_type(ltree_addr, 1);
set_type(node_addr, 2);
*mlen = smlen - XMSS_BYTES;
// Extract index
for (i = 0; i < XMSS_INDEX_LEN; i++) {
idx |= ((unsigned long long)sm[i]) << (8*(XMSS_INDEX_LEN - 1 - i));
}
// Generate hash key (R || root || idx)
memcpy(hash_key, sm + XMSS_INDEX_LEN, XMSS_N);
memcpy(hash_key + XMSS_N, pk, XMSS_N);
to_byte(hash_key + 2*XMSS_N, idx, XMSS_N);
// hash message
h_msg(msg_h, sm + XMSS_BYTES, *mlen, hash_key, 3*XMSS_N);
sm += XMSS_INDEX_LEN + XMSS_N;
for (i = 0; i < XMSS_D; i++) {
// Prepare Address
idx_leaf = (idx & ((1 << XMSS_TREEHEIGHT)-1));
idx = idx >> XMSS_TREEHEIGHT;
set_layer_addr(ots_addr, i);
set_layer_addr(ltree_addr, i);
set_layer_addr(node_addr, i);
set_tree_addr(ltree_addr, idx);
set_tree_addr(ots_addr, idx);
set_tree_addr(node_addr, idx);
set_ots_addr(ots_addr, idx_leaf);
// Check WOTS signature
wots_pk_from_sig(wots_pk, sm, root, pub_seed, ots_addr);
sm += XMSS_WOTS_KEYSIZE;
// Compute Ltree
set_ltree_addr(ltree_addr, idx_leaf);
l_tree(pkhash, wots_pk, pub_seed, ltree_addr);
// Compute root
validate_authpath(root, pkhash, idx_leaf, sm, pub_seed, node_addr);
sm += XMSS_TREEHEIGHT*XMSS_N;
}
for (i = 0; i < XMSS_N; i++) {
if (root[i] != pk[i]) {
for (i = 0; i < *mlen; i++) {
m[i] = 0;
}
*mlen = -1;
return -1;
}
}
for (i = 0; i < *mlen; i++) {
m[i] = sm[i];
}
return 0;
} }

24
xmss_commons.h
View File

@ -11,10 +11,24 @@ Public domain.
#include <stdint.h> #include <stdint.h>
void to_byte(unsigned char *output, unsigned long long in, uint32_t bytes); void to_byte(unsigned char *output, unsigned long long in, uint32_t bytes);
void hexdump(const unsigned char *a, size_t len); void hexdump(const unsigned char *a, size_t len);
void gen_leaf_wots(unsigned char *leaf, const unsigned char *sk_seed, const unsigned char *pub_seed, uint32_t ltree_addr[8], uint32_t ots_addr[8]);
void get_seed(unsigned char *seed, const unsigned char *sk_seed, uint32_t addr[8]); void gen_leaf_wots(unsigned char *leaf,
void l_tree(unsigned char *leaf, unsigned char *wots_pk, const unsigned char *pub_seed, uint32_t addr[8]); const unsigned char *sk_seed, const unsigned char *pub_seed,
int xmss_core_sign_open(unsigned char *msg, unsigned long long *msglen, const unsigned char *sig_msg, unsigned long long sig_msg_len, const unsigned char *pk); uint32_t ltree_addr[8], uint32_t ots_addr[8]);
int xmssmt_core_sign_open(unsigned char *msg, unsigned long long *msglen, const unsigned char *sig_msg, unsigned long long sig_msg_len, const unsigned char *pk);
void get_seed(unsigned char *seed,
const unsigned char *sk_seed, uint32_t addr[8]);
void l_tree(unsigned char *leaf, unsigned char *wots_pk,
const unsigned char *pub_seed, uint32_t addr[8]);
int xmss_core_sign_open(unsigned char *m, unsigned long long *mlen,
const unsigned char *sm, unsigned long long smlen,
const unsigned char *pk);
int xmssmt_core_sign_open(unsigned char *m, unsigned long long *mlen,
const unsigned char *sm, unsigned long long smlen,
const unsigned char *pk);
#endif #endif

531
xmss_core.c
View File

@ -5,17 +5,17 @@ Joost Rijneveld
Public domain. Public domain.
*/ */
#include "xmss_core.h"
#include <stdlib.h> #include <stdlib.h>
#include <string.h> #include <string.h>
#include <stdint.h> #include <stdint.h>
#include "randombytes.h"
#include "wots.h"
#include "hash.h" #include "hash.h"
#include "xmss_commons.h"
#include "hash_address.h" #include "hash_address.h"
#include "params.h" #include "params.h"
#include "randombytes.h"
#include "wots.h"
#include "xmss_commons.h"
#include "xmss_core.h"
/** /**
* Merkle's TreeHash algorithm. The address only needs to initialize the first 78 bits of addr. Everything else will be set by treehash. * Merkle's TreeHash algorithm. The address only needs to initialize the first 78 bits of addr. Everything else will be set by treehash.
@ -24,43 +24,44 @@ Public domain.
*/ */
static void treehash(unsigned char *node, uint32_t index, const unsigned char *sk_seed, const unsigned char *pub_seed, const uint32_t addr[8]) static void treehash(unsigned char *node, uint32_t index, const unsigned char *sk_seed, const unsigned char *pub_seed, const uint32_t addr[8])
{ {
uint32_t idx = index; uint32_t idx = index;
// use three different addresses because at this point we use all three formats in parallel // use three different addresses because at this point we use all three formats in parallel
uint32_t ots_addr[8]; uint32_t ots_addr[8];
uint32_t ltree_addr[8]; uint32_t ltree_addr[8];
uint32_t node_addr[8]; uint32_t node_addr[8];
// only copy layer and tree address parts // only copy layer and tree address parts
memcpy(ots_addr, addr, 12); memcpy(ots_addr, addr, 12);
// type = ots // type = ots
setType(ots_addr, 0); set_type(ots_addr, 0);
memcpy(ltree_addr, addr, 12); memcpy(ltree_addr, addr, 12);
setType(ltree_addr, 1); set_type(ltree_addr, 1);
memcpy(node_addr, addr, 12); memcpy(node_addr, addr, 12);
setType(node_addr, 2); set_type(node_addr, 2);
uint32_t lastnode, i; uint32_t lastnode, i;
unsigned char stack[(XMSS_TREEHEIGHT+1)*XMSS_N]; unsigned char stack[(XMSS_TREEHEIGHT+1)*XMSS_N];
uint16_t stacklevels[XMSS_TREEHEIGHT+1]; uint16_t stacklevels[XMSS_TREEHEIGHT+1];
unsigned int stackoffset=0; unsigned int stackoffset=0;
lastnode = idx+(1 << XMSS_TREEHEIGHT); lastnode = idx+(1 << XMSS_TREEHEIGHT);
for (; idx < lastnode; idx++) { for (; idx < lastnode; idx++) {
setLtreeADRS(ltree_addr, idx); set_ltree_addr(ltree_addr, idx);
setOTSADRS(ots_addr, idx); set_ots_addr(ots_addr, idx);
gen_leaf_wots(stack+stackoffset*XMSS_N, sk_seed, pub_seed, ltree_addr, ots_addr); gen_leaf_wots(stack+stackoffset*XMSS_N, sk_seed, pub_seed, ltree_addr, ots_addr);
stacklevels[stackoffset] = 0; stacklevels[stackoffset] = 0;
stackoffset++; stackoffset++;
while (stackoffset>1 && stacklevels[stackoffset-1] == stacklevels[stackoffset-2]) { while (stackoffset>1 && stacklevels[stackoffset-1] == stacklevels[stackoffset-2]) {
setTreeHeight(node_addr, stacklevels[stackoffset-1]); set_tree_height(node_addr, stacklevels[stackoffset-1]);
setTreeIndex(node_addr, (idx >> (stacklevels[stackoffset-1]+1))); set_tree_index(node_addr, (idx >> (stacklevels[stackoffset-1]+1)));
hash_h(stack+(stackoffset-2)*XMSS_N, stack+(stackoffset-2)*XMSS_N, pub_seed, node_addr); hash_h(stack+(stackoffset-2)*XMSS_N, stack+(stackoffset-2)*XMSS_N, pub_seed, node_addr);
stacklevels[stackoffset-2]++; stacklevels[stackoffset-2]++;
stackoffset--; stackoffset--;
}
}
for (i = 0; i < XMSS_N; i++) {
node[i] = stack[i];
} }
}
for (i = 0; i < XMSS_N; i++)
node[i] = stack[i];
} }
/** /**
@ -70,48 +71,49 @@ static void treehash(unsigned char *node, uint32_t index, const unsigned char *s
*/ */
static void compute_authpath_wots(unsigned char *root, unsigned char *authpath, unsigned long leaf_idx, const unsigned char *sk_seed, unsigned char *pub_seed, uint32_t addr[8]) static void compute_authpath_wots(unsigned char *root, unsigned char *authpath, unsigned long leaf_idx, const unsigned char *sk_seed, unsigned char *pub_seed, uint32_t addr[8])
{ {
uint32_t i, j, level; uint32_t i, j, level;
unsigned char tree[2*(1<<XMSS_TREEHEIGHT)*XMSS_N]; unsigned char tree[2*(1<<XMSS_TREEHEIGHT)*XMSS_N];
uint32_t ots_addr[8]; uint32_t ots_addr[8];
uint32_t ltree_addr[8]; uint32_t ltree_addr[8];
uint32_t node_addr[8]; uint32_t node_addr[8];
memcpy(ots_addr, addr, 12); memcpy(ots_addr, addr, 12);
setType(ots_addr, 0); set_type(ots_addr, 0);
memcpy(ltree_addr, addr, 12); memcpy(ltree_addr, addr, 12);
setType(ltree_addr, 1); set_type(ltree_addr, 1);
memcpy(node_addr, addr, 12); memcpy(node_addr, addr, 12);
setType(node_addr, 2); set_type(node_addr, 2);
// Compute all leaves // Compute all leaves
for (i = 0; i < (1U << XMSS_TREEHEIGHT); i++) { for (i = 0; i < (1U << XMSS_TREEHEIGHT); i++) {
setLtreeADRS(ltree_addr, i); set_ltree_addr(ltree_addr, i);
setOTSADRS(ots_addr, i); set_ots_addr(ots_addr, i);
gen_leaf_wots(tree+((1<<XMSS_TREEHEIGHT)*XMSS_N + i*XMSS_N), sk_seed, pub_seed, ltree_addr, ots_addr); gen_leaf_wots(tree+((1<<XMSS_TREEHEIGHT)*XMSS_N + i*XMSS_N), sk_seed, pub_seed, ltree_addr, ots_addr);
}
level = 0;
// Compute tree:
// Outer loop: For each inner layer
for (i = (1<<XMSS_TREEHEIGHT); i > 1; i>>=1) {
setTreeHeight(node_addr, level);
// Inner loop: for each pair of sibling nodes
for (j = 0; j < i; j+=2) {
setTreeIndex(node_addr, j>>1);
hash_h(tree + (i>>1)*XMSS_N + (j>>1) * XMSS_N, tree + i*XMSS_N + j*XMSS_N, pub_seed, node_addr);
} }
level++;
}
// copy authpath
for (i = 0; i < XMSS_TREEHEIGHT; i++)
memcpy(authpath + i*XMSS_N, tree + ((1<<XMSS_TREEHEIGHT)>>i)*XMSS_N + ((leaf_idx >> i) ^ 1) * XMSS_N, XMSS_N);
// copy root level = 0;
memcpy(root, tree+XMSS_N, XMSS_N); // Compute tree:
// Outer loop: For each inner layer
for (i = (1<<XMSS_TREEHEIGHT); i > 1; i>>=1) {
set_tree_height(node_addr, level);
// Inner loop: for each pair of sibling nodes
for (j = 0; j < i; j+=2) {
set_tree_index(node_addr, j>>1);
hash_h(tree + (i>>1)*XMSS_N + (j>>1) * XMSS_N, tree + i*XMSS_N + j*XMSS_N, pub_seed, node_addr);
}
level++;
}
// copy authpath
for (i = 0; i < XMSS_TREEHEIGHT; i++) {
memcpy(authpath + i*XMSS_N, tree + ((1<<XMSS_TREEHEIGHT)>>i)*XMSS_N + ((leaf_idx >> i) ^ 1) * XMSS_N, XMSS_N);
}
// copy root
memcpy(root, tree+XMSS_N, XMSS_N);
} }
@ -122,22 +124,22 @@ static void compute_authpath_wots(unsigned char *root, unsigned char *authpath,
*/ */
int xmss_core_keypair(unsigned char *pk, unsigned char *sk) int xmss_core_keypair(unsigned char *pk, unsigned char *sk)
{ {
// Set idx = 0 // Set idx = 0
sk[0] = 0; sk[0] = 0;
sk[1] = 0; sk[1] = 0;
sk[2] = 0; sk[2] = 0;
sk[3] = 0; sk[3] = 0;
// Init SK_SEED (XMSS_N byte), SK_PRF (XMSS_N byte), and PUB_SEED (XMSS_N byte) // Init SK_SEED (XMSS_N byte), SK_PRF (XMSS_N byte), and PUB_SEED (XMSS_N byte)
randombytes(sk+4, 3*XMSS_N); randombytes(sk+4, 3*XMSS_N);
// Copy PUB_SEED to public key // Copy PUB_SEED to public key
memcpy(pk+XMSS_N, sk+4+2*XMSS_N, XMSS_N); memcpy(pk+XMSS_N, sk+4+2*XMSS_N, XMSS_N);
uint32_t addr[8] = {0, 0, 0, 0, 0, 0, 0, 0}; uint32_t addr[8] = {0, 0, 0, 0, 0, 0, 0, 0};
// Compute root // Compute root
treehash(pk, 0, sk+4, sk+4+2*XMSS_N, addr); treehash(pk, 0, sk+4, sk+4+2*XMSS_N, addr);
// copy root to sk // copy root to sk
memcpy(sk+4+3*XMSS_N, pk, XMSS_N); memcpy(sk+4+3*XMSS_N, pk, XMSS_N);
return 0; return 0;
} }
/** /**
@ -149,96 +151,96 @@ int xmss_core_keypair(unsigned char *pk, unsigned char *sk)
*/ */
int xmss_core_sign(unsigned char *sk, unsigned char *sm, unsigned long long *smlen, const unsigned char *m, unsigned long long mlen) int xmss_core_sign(unsigned char *sk, unsigned char *sm, unsigned long long *smlen, const unsigned char *m, unsigned long long mlen)
{ {
uint16_t i = 0; uint16_t i = 0;
// Extract SK // Extract SK
uint32_t idx = ((unsigned long)sk[0] << 24) | ((unsigned long)sk[1] << 16) | ((unsigned long)sk[2] << 8) | sk[3]; uint32_t idx = ((unsigned long)sk[0] << 24) | ((unsigned long)sk[1] << 16) | ((unsigned long)sk[2] << 8) | sk[3];
unsigned char sk_seed[XMSS_N]; unsigned char sk_seed[XMSS_N];
unsigned char sk_prf[XMSS_N]; unsigned char sk_prf[XMSS_N];
unsigned char pub_seed[XMSS_N]; unsigned char pub_seed[XMSS_N];
unsigned char hash_key[3*XMSS_N]; unsigned char hash_key[3*XMSS_N];
// index as 32 bytes string // index as 32 bytes string
unsigned char idx_bytes_32[32]; unsigned char idx_bytes_32[32];
to_byte(idx_bytes_32, idx, 32); to_byte(idx_bytes_32, idx, 32);
memcpy(sk_seed, sk+4, XMSS_N); memcpy(sk_seed, sk+4, XMSS_N);
memcpy(sk_prf, sk+4+XMSS_N, XMSS_N); memcpy(sk_prf, sk+4+XMSS_N, XMSS_N);
memcpy(pub_seed, sk+4+2*XMSS_N, XMSS_N); memcpy(pub_seed, sk+4+2*XMSS_N, XMSS_N);
// Update SK // Update SK
sk[0] = ((idx + 1) >> 24) & 255; sk[0] = ((idx + 1) >> 24) & 255;
sk[1] = ((idx + 1) >> 16) & 255; sk[1] = ((idx + 1) >> 16) & 255;
sk[2] = ((idx + 1) >> 8) & 255; sk[2] = ((idx + 1) >> 8) & 255;
sk[3] = (idx + 1) & 255; sk[3] = (idx + 1) & 255;
// -- Secret key for this non-forward-secure version is now updated. // -- Secret key for this non-forward-secure version is now updated.
// -- A productive implementation should use a file handle instead and write the updated secret key at this point! // -- A productive implementation should use a file handle instead and write the updated secret key at this point!
// Init working params // Init working params
unsigned char R[XMSS_N]; unsigned char R[XMSS_N];
unsigned char msg_h[XMSS_N]; unsigned char msg_h[XMSS_N];
unsigned char root[XMSS_N]; unsigned char root[XMSS_N];
unsigned char ots_seed[XMSS_N]; unsigned char ots_seed[XMSS_N];
uint32_t ots_addr[8] = {0, 0, 0, 0, 0, 0, 0, 0}; uint32_t ots_addr[8] = {0, 0, 0, 0, 0, 0, 0, 0};
// --------------------------------- // ---------------------------------
// Message Hashing // Message Hashing
// --------------------------------- // ---------------------------------
// Message Hash: // Message Hash:
// First compute pseudorandom value // First compute pseudorandom value
prf(R, idx_bytes_32, sk_prf, XMSS_N); prf(R, idx_bytes_32, sk_prf, XMSS_N);
// Generate hash key (R || root || idx) // Generate hash key (R || root || idx)
memcpy(hash_key, R, XMSS_N); memcpy(hash_key, R, XMSS_N);
memcpy(hash_key+XMSS_N, sk+4+3*XMSS_N, XMSS_N); memcpy(hash_key+XMSS_N, sk+4+3*XMSS_N, XMSS_N);
to_byte(hash_key+2*XMSS_N, idx, XMSS_N); to_byte(hash_key+2*XMSS_N, idx, XMSS_N);
// Then use it for message digest // Then use it for message digest
h_msg(msg_h, m, mlen, hash_key, 3*XMSS_N); h_msg(msg_h, m, mlen, hash_key, 3*XMSS_N);
// Start collecting signature // Start collecting signature
*smlen = 0; *smlen = 0;
// Copy index to signature // Copy index to signature
sm[0] = (idx >> 24) & 255; sm[0] = (idx >> 24) & 255;
sm[1] = (idx >> 16) & 255; sm[1] = (idx >> 16) & 255;
sm[2] = (idx >> 8) & 255; sm[2] = (idx >> 8) & 255;
sm[3] = idx & 255; sm[3] = idx & 255;
sm += 4; sm += 4;
*smlen += 4; *smlen += 4;
// Copy R to signature // Copy R to signature
for (i = 0; i < XMSS_N; i++) for (i = 0; i < XMSS_N; i++)
sm[i] = R[i]; sm[i] = R[i];
sm += XMSS_N; sm += XMSS_N;
*smlen += XMSS_N; *smlen += XMSS_N;
// ---------------------------------- // ----------------------------------
// Now we start to "really sign" // Now we start to "really sign"
// ---------------------------------- // ----------------------------------
// Prepare Address // Prepare Address
setType(ots_addr, 0); set_type(ots_addr, 0);
setOTSADRS(ots_addr, idx); set_ots_addr(ots_addr, idx);
// Compute seed for OTS key pair // Compute seed for OTS key pair
get_seed(ots_seed, sk_seed, ots_addr); get_seed(ots_seed, sk_seed, ots_addr);
// Compute WOTS signature // Compute WOTS signature
wots_sign(sm, msg_h, ots_seed, pub_seed, ots_addr); wots_sign(sm, msg_h, ots_seed, pub_seed, ots_addr);
sm += XMSS_WOTS_KEYSIZE; sm += XMSS_WOTS_KEYSIZE;
*smlen += XMSS_WOTS_KEYSIZE; *smlen += XMSS_WOTS_KEYSIZE;
compute_authpath_wots(root, sm, idx, sk_seed, pub_seed, ots_addr); compute_authpath_wots(root, sm, idx, sk_seed, pub_seed, ots_addr);
sm += XMSS_TREEHEIGHT*XMSS_N; sm += XMSS_TREEHEIGHT*XMSS_N;
*smlen += XMSS_TREEHEIGHT*XMSS_N; *smlen += XMSS_TREEHEIGHT*XMSS_N;
memcpy(sm, m, mlen); memcpy(sm, m, mlen);
*smlen += mlen; *smlen += mlen;
return 0; return 0;
} }
/* /*
@ -248,24 +250,24 @@ int xmss_core_sign(unsigned char *sk, unsigned char *sm, unsigned long long *sml
*/ */
int xmssmt_core_keypair(unsigned char *pk, unsigned char *sk) int xmssmt_core_keypair(unsigned char *pk, unsigned char *sk)
{ {
uint16_t i; uint16_t i;
// Set idx = 0 // Set idx = 0
for (i = 0; i < XMSS_INDEX_LEN; i++) { for (i = 0; i < XMSS_INDEX_LEN; i++) {
sk[i] = 0; sk[i] = 0;
} }
// Init SK_SEED (XMSS_N byte), SK_PRF (XMSS_N byte), and PUB_SEED (XMSS_N byte) // Init SK_SEED (XMSS_N byte), SK_PRF (XMSS_N byte), and PUB_SEED (XMSS_N byte)
randombytes(sk+XMSS_INDEX_LEN, 3*XMSS_N); randombytes(sk+XMSS_INDEX_LEN, 3*XMSS_N);
// Copy PUB_SEED to public key // Copy PUB_SEED to public key
memcpy(pk+XMSS_N, sk+XMSS_INDEX_LEN+2*XMSS_N, XMSS_N); memcpy(pk+XMSS_N, sk+XMSS_INDEX_LEN+2*XMSS_N, XMSS_N);
// Set address to point on the single tree on layer d-1 // Set address to point on the single tree on layer d-1
uint32_t addr[8] = {0, 0, 0, 0, 0, 0, 0, 0}; uint32_t addr[8] = {0, 0, 0, 0, 0, 0, 0, 0};
setLayerADRS(addr, (XMSS_D-1)); set_layer_addr(addr, (XMSS_D-1));
// Compute root // Compute root
treehash(pk, 0, sk+XMSS_INDEX_LEN, pk+XMSS_N, addr); treehash(pk, 0, sk+XMSS_INDEX_LEN, pk+XMSS_N, addr);
memcpy(sk+XMSS_INDEX_LEN+3*XMSS_N, pk, XMSS_N); memcpy(sk+XMSS_INDEX_LEN+3*XMSS_N, pk, XMSS_N);
return 0; return 0;
} }
/** /**
@ -277,116 +279,94 @@ int xmssmt_core_keypair(unsigned char *pk, unsigned char *sk)
*/ */
int xmssmt_core_sign(unsigned char *sk, unsigned char *sm, unsigned long long *smlen, const unsigned char *m, unsigned long long mlen) int xmssmt_core_sign(unsigned char *sk, unsigned char *sm, unsigned long long *smlen, const unsigned char *m, unsigned long long mlen)
{ {
uint64_t idx_tree; uint64_t idx_tree;
uint32_t idx_leaf; uint32_t idx_leaf;
uint64_t i; uint64_t i;
unsigned char sk_seed[XMSS_N]; unsigned char sk_seed[XMSS_N];
unsigned char sk_prf[XMSS_N]; unsigned char sk_prf[XMSS_N];
unsigned char pub_seed[XMSS_N]; unsigned char pub_seed[XMSS_N];
// Init working params // Init working params
unsigned char R[XMSS_N]; unsigned char R[XMSS_N];
unsigned char hash_key[3*XMSS_N]; unsigned char hash_key[3*XMSS_N];
unsigned char msg_h[XMSS_N]; unsigned char msg_h[XMSS_N];
unsigned char root[XMSS_N]; unsigned char root[XMSS_N];
unsigned char ots_seed[XMSS_N]; unsigned char ots_seed[XMSS_N];
uint32_t ots_addr[8] = {0, 0, 0, 0, 0, 0, 0, 0}; uint32_t ots_addr[8] = {0, 0, 0, 0, 0, 0, 0, 0};
unsigned char idx_bytes_32[32]; unsigned char idx_bytes_32[32];
// Extract SK // Extract SK
unsigned long long idx = 0; unsigned long long idx = 0;
for (i = 0; i < XMSS_INDEX_LEN; i++) { for (i = 0; i < XMSS_INDEX_LEN; i++) {
idx |= ((unsigned long long)sk[i]) << 8*(XMSS_INDEX_LEN - 1 - i); idx |= ((unsigned long long)sk[i]) << 8*(XMSS_INDEX_LEN - 1 - i);
} }
memcpy(sk_seed, sk+XMSS_INDEX_LEN, XMSS_N); memcpy(sk_seed, sk+XMSS_INDEX_LEN, XMSS_N);
memcpy(sk_prf, sk+XMSS_INDEX_LEN+XMSS_N, XMSS_N); memcpy(sk_prf, sk+XMSS_INDEX_LEN+XMSS_N, XMSS_N);
memcpy(pub_seed, sk+XMSS_INDEX_LEN+2*XMSS_N, XMSS_N); memcpy(pub_seed, sk+XMSS_INDEX_LEN+2*XMSS_N, XMSS_N);
// Update SK // Update SK
for (i = 0; i < XMSS_INDEX_LEN; i++) { for (i = 0; i < XMSS_INDEX_LEN; i++) {
sk[i] = ((idx + 1) >> 8*(XMSS_INDEX_LEN - 1 - i)) & 255; sk[i] = ((idx + 1) >> 8*(XMSS_INDEX_LEN - 1 - i)) & 255;
} }
// -- Secret key for this non-forward-secure version is now updated. // -- Secret key for this non-forward-secure version is now updated.
// -- A productive implementation should use a file handle instead and write the updated secret key at this point! // -- A productive implementation should use a file handle instead and write the updated secret key at this point!
// --------------------------------- // ---------------------------------
// Message Hashing // Message Hashing
// --------------------------------- // ---------------------------------
// Message Hash: // Message Hash:
// First compute pseudorandom value // First compute pseudorandom value
to_byte(idx_bytes_32, idx, 32); to_byte(idx_bytes_32, idx, 32);
prf(R, idx_bytes_32, sk_prf, XMSS_N); prf(R, idx_bytes_32, sk_prf, XMSS_N);
// Generate hash key (R || root || idx) // Generate hash key (R || root || idx)
memcpy(hash_key, R, XMSS_N); memcpy(hash_key, R, XMSS_N);
memcpy(hash_key+XMSS_N, sk+XMSS_INDEX_LEN+3*XMSS_N, XMSS_N); memcpy(hash_key+XMSS_N, sk+XMSS_INDEX_LEN+3*XMSS_N, XMSS_N);
to_byte(hash_key+2*XMSS_N, idx, XMSS_N); to_byte(hash_key+2*XMSS_N, idx, XMSS_N);
// Then use it for message digest // Then use it for message digest
h_msg(msg_h, m, mlen, hash_key, 3*XMSS_N); h_msg(msg_h, m, mlen, hash_key, 3*XMSS_N);
// Start collecting signature // Start collecting signature
*smlen = 0; *smlen = 0;
// Copy index to signature // Copy index to signature
for (i = 0; i < XMSS_INDEX_LEN; i++) { for (i = 0; i < XMSS_INDEX_LEN; i++) {
sm[i] = (idx >> 8*(XMSS_INDEX_LEN - 1 - i)) & 255; sm[i] = (idx >> 8*(XMSS_INDEX_LEN - 1 - i)) & 255;
} }
sm += XMSS_INDEX_LEN; sm += XMSS_INDEX_LEN;
*smlen += XMSS_INDEX_LEN; *smlen += XMSS_INDEX_LEN;
// Copy R to signature // Copy R to signature
for (i = 0; i < XMSS_N; i++) for (i = 0; i < XMSS_N; i++) {
sm[i] = R[i]; sm[i] = R[i];
}
sm += XMSS_N; sm += XMSS_N;
*smlen += XMSS_N; *smlen += XMSS_N;
// ---------------------------------- // ----------------------------------
// Now we start to "really sign" // Now we start to "really sign"
// ---------------------------------- // ----------------------------------
// Handle lowest layer separately as it is slightly different... // Handle lowest layer separately as it is slightly different...
// Prepare Address
setType(ots_addr, 0);
idx_tree = idx >> XMSS_TREEHEIGHT;
idx_leaf = (idx & ((1 << XMSS_TREEHEIGHT)-1));
setLayerADRS(ots_addr, 0);
setTreeADRS(ots_addr, idx_tree);
setOTSADRS(ots_addr, idx_leaf);
// Compute seed for OTS key pair
get_seed(ots_seed, sk_seed, ots_addr);
// Compute WOTS signature
wots_sign(sm, msg_h, ots_seed, pub_seed, ots_addr);
sm += XMSS_WOTS_KEYSIZE;
*smlen += XMSS_WOTS_KEYSIZE;
compute_authpath_wots(root, sm, idx_leaf, sk_seed, pub_seed, ots_addr);
sm += XMSS_TREEHEIGHT*XMSS_N;
*smlen += XMSS_TREEHEIGHT*XMSS_N;
// Now loop over remaining layers...
unsigned int j;
for (j = 1; j < XMSS_D; j++) {
// Prepare Address // Prepare Address
idx_leaf = (idx_tree & ((1 << XMSS_TREEHEIGHT)-1)); set_type(ots_addr, 0);
idx_tree = idx_tree >> XMSS_TREEHEIGHT; idx_tree = idx >> XMSS_TREEHEIGHT;
setLayerADRS(ots_addr, j); idx_leaf = (idx & ((1 << XMSS_TREEHEIGHT)-1));
setTreeADRS(ots_addr, idx_tree); set_layer_addr(ots_addr, 0);
setOTSADRS(ots_addr, idx_leaf); set_tree_addr(ots_addr, idx_tree);
set_ots_addr(ots_addr, idx_leaf);
// Compute seed for OTS key pair // Compute seed for OTS key pair
get_seed(ots_seed, sk_seed, ots_addr); get_seed(ots_seed, sk_seed, ots_addr);
// Compute WOTS signature // Compute WOTS signature
wots_sign(sm, root, ots_seed, pub_seed, ots_addr); wots_sign(sm, msg_h, ots_seed, pub_seed, ots_addr);
sm += XMSS_WOTS_KEYSIZE; sm += XMSS_WOTS_KEYSIZE;
*smlen += XMSS_WOTS_KEYSIZE; *smlen += XMSS_WOTS_KEYSIZE;
@ -394,10 +374,33 @@ int xmssmt_core_sign(unsigned char *sk, unsigned char *sm, unsigned long long *s
compute_authpath_wots(root, sm, idx_leaf, sk_seed, pub_seed, ots_addr); compute_authpath_wots(root, sm, idx_leaf, sk_seed, pub_seed, ots_addr);
sm += XMSS_TREEHEIGHT*XMSS_N; sm += XMSS_TREEHEIGHT*XMSS_N;
*smlen += XMSS_TREEHEIGHT*XMSS_N; *smlen += XMSS_TREEHEIGHT*XMSS_N;
}
memcpy(sm, m, mlen); // Now loop over remaining layers...
*smlen += mlen; unsigned int j;
for (j = 1; j < XMSS_D; j++) {
// Prepare Address
idx_leaf = (idx_tree & ((1 << XMSS_TREEHEIGHT)-1));
idx_tree = idx_tree >> XMSS_TREEHEIGHT;
set_layer_addr(ots_addr, j);
set_tree_addr(ots_addr, idx_tree);
set_ots_addr(ots_addr, idx_leaf);
return 0; // Compute seed for OTS key pair
get_seed(ots_seed, sk_seed, ots_addr);
// Compute WOTS signature
wots_sign(sm, root, ots_seed, pub_seed, ots_addr);
sm += XMSS_WOTS_KEYSIZE;
*smlen += XMSS_WOTS_KEYSIZE;
compute_authpath_wots(root, sm, idx_leaf, sk_seed, pub_seed, ots_addr);
sm += XMSS_TREEHEIGHT*XMSS_N;
*smlen += XMSS_TREEHEIGHT*XMSS_N;
}
memcpy(sm, m, mlen);
*smlen += mlen;
return 0;
} }

1042
xmss_core_fast.c
View File

File diff suppressed because it is too large Load Diff

67
xmss_core_fast.h
View File

@ -5,35 +5,37 @@ Joost Rijneveld
Public domain. Public domain.
*/ */
#include "wots.h"
#ifndef XMSS_CORE_H #ifndef XMSS_CORE_H
#define XMSS_CORE_H #define XMSS_CORE_H
typedef struct{ typedef struct{
unsigned int h; unsigned int h;
unsigned int next_idx; unsigned int next_idx;
unsigned int stackusage; unsigned int stackusage;
unsigned char completed; unsigned char completed;
unsigned char *node; unsigned char *node;
} treehash_inst; } treehash_inst;
typedef struct { typedef struct {
unsigned char *stack; unsigned char *stack;
unsigned int stackoffset; unsigned int stackoffset;
unsigned char *stacklevels; unsigned char *stacklevels;
unsigned char *auth; unsigned char *auth;
unsigned char *keep; unsigned char *keep;
treehash_inst *treehash; treehash_inst *treehash;
unsigned char *retain; unsigned char *retain;
unsigned int next_leaf; unsigned int next_leaf;
} bds_state; } bds_state;
/** /**
* Initialize BDS state struct * Initialize BDS state struct
* parameter names are the same as used in the description of the BDS traversal * parameter names are the same as used in the description of the BDS traversal
*/ */
void xmss_set_bds_state(bds_state *state, unsigned char *stack, int stackoffset, unsigned char *stacklevels, unsigned char *auth, unsigned char *keep, treehash_inst *treehash, unsigned char *retain, int next_leaf); void xmss_set_bds_state(bds_state *state, unsigned char *stack,
int stackoffset, unsigned char *stacklevels,
unsigned char *auth, unsigned char *keep,
treehash_inst *treehash, unsigned char *retain,
int next_leaf);
/** /**
* Generates a XMSS key pair for a given parameter set. * Generates a XMSS key pair for a given parameter set.
* Format sk: [(32bit) idx || SK_SEED || SK_PRF || PUB_SEED || root] * Format sk: [(32bit) idx || SK_SEED || SK_PRF || PUB_SEED || root]
@ -42,36 +44,45 @@ void xmss_set_bds_state(bds_state *state, unsigned char *stack, int stackoffset,
int xmss_core_keypair(unsigned char *pk, unsigned char *sk, bds_state *state); int xmss_core_keypair(unsigned char *pk, unsigned char *sk, bds_state *state);
/** /**
* Signs a message. * Signs a message.
* Returns * Returns
* 1. an array containing the signature followed by the message AND * 1. an array containing the signature followed by the message AND
* 2. an updated secret key! * 2. an updated secret key!
*
*/ */
int xmss_core_sign(unsigned char *sk, bds_state *state, unsigned char *sig_msg, unsigned long long *sig_msg_len, const unsigned char *msg,unsigned long long msglen); int xmss_core_sign(unsigned char *sk, bds_state *state,
unsigned char *sm, unsigned long long *smlen,
const unsigned char *m, unsigned long long mlen);
/** /**
* Verifies a given message signature pair under a given public key. * Verifies a given message signature pair under a given public key.
* *
* Note: msg and msglen are pure outputs which carry the message in case verification succeeds. The (input) message is assumed to be within sig_msg which has the form (sig||msg). * Note: msg and mlen are pure outputs which carry the message in case verification succeeds. The (input) message is assumed to be within sm which has the form (sig||msg).
*/ */
int xmss_core_sign_open(unsigned char *msg,unsigned long long *msglen, const unsigned char *sig_msg,unsigned long long sig_msg_len, const unsigned char *pk); int xmss_core_sign_open(unsigned char *m, unsigned long long *mlen,
const unsigned char *sm, unsigned long long smlen,
const unsigned char *pk);
/* /*
* Generates a XMSSMT key pair for a given parameter set. * Generates a XMSSMT key pair for a given parameter set.
* Format sk: [(ceil(h/8) bit) idx || SK_SEED || SK_PRF || PUB_SEED || root] * Format sk: [(ceil(h/8) bit) idx || SK_SEED || SK_PRF || PUB_SEED || root]
* Format pk: [root || PUB_SEED] omitting algo oid. * Format pk: [root || PUB_SEED] omitting algo oid.
*/ */
int xmssmt_core_keypair(unsigned char *pk, unsigned char *sk, bds_state *states, unsigned char *wots_sigs); int xmssmt_core_keypair(unsigned char *pk, unsigned char *sk,
bds_state *states, unsigned char *wots_sigs);
/** /**
* Signs a message. * Signs a message.
* Returns * Returns
* 1. an array containing the signature followed by the message AND * 1. an array containing the signature followed by the message AND
* 2. an updated secret key! * 2. an updated secret key!
*
*/ */
int xmssmt_core_sign(unsigned char *sk, bds_state *state, unsigned char *wots_sigs, unsigned char *sig_msg, unsigned long long *sig_msg_len, const unsigned char *msg, unsigned long long msglen); int xmssmt_core_sign(unsigned char *sk,
bds_state *states, unsigned char *wots_sigs,
unsigned char *sm, unsigned long long *smlen,
const unsigned char *m, unsigned long long mlen);
/** /**
* Verifies a given message signature pair under a given public key. * Verifies a given message signature pair under a given public key.
*/ */
int xmssmt_core_sign_open(unsigned char *msg, unsigned long long *msglen, const unsigned char *sig_msg, unsigned long long sig_msg_len, const unsigned char *pk); int xmssmt_core_sign_open(unsigned char *m, unsigned long long *mlen,
const unsigned char *sm, unsigned long long smlen,
const unsigned char *pk);
#endif #endif