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pqcrypto/common/fips202.c
Joost Rijneveld 7028025eb9
Normalize whitespace
2019-01-16 11:02:32 +01:00

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/* Based on the public domain implementation in
* crypto_hash/keccakc512/simple/ from http://bench.cr.yp.to/supercop.html
* by Ronny Van Keer
* and the public domain "TweetFips202" implementation
* from https://twitter.com/tweetfips202
* by Gilles Van Assche, Daniel J. Bernstein, and Peter Schwabe */
#include "fips202.h"
#include <stddef.h>
#include <stdint.h>
#define NROUNDS 24
#define ROL(a, offset) (((a) << (offset)) ^ ((a) >> (64 - (offset))))
/*************************************************
* Name: load64
*
* Description: Load 8 bytes into uint64_t in little-endian order
*
* Arguments: - const unsigned char *x: pointer to input byte array
*
* Returns the loaded 64-bit unsigned integer
**************************************************/
static uint64_t load64(const unsigned char *x) {
unsigned int i;
uint64_t r = 0;
for (i = 0; i < 8; ++i) {
r |= (uint64_t)x[i] << 8 * i;
}
return r;
}
/*************************************************
* Name: store64
*
* Description: Store a 64-bit integer to a byte array in little-endian order
*
* Arguments: - uint8_t *x: pointer to the output byte array
* - uint64_t u: input 64-bit unsigned integer
**************************************************/
static void store64(uint8_t *x, uint64_t u) {
unsigned int i;
for (i = 0; i < 8; ++i) {
x[i] = u >> 8 * i;
}
}
/* Keccak round constants */
static const uint64_t KeccakF_RoundConstants[NROUNDS] = {
(uint64_t)0x0000000000000001ULL, (uint64_t)0x0000000000008082ULL,
(uint64_t)0x800000000000808aULL, (uint64_t)0x8000000080008000ULL,
(uint64_t)0x000000000000808bULL, (uint64_t)0x0000000080000001ULL,
(uint64_t)0x8000000080008081ULL, (uint64_t)0x8000000000008009ULL,
(uint64_t)0x000000000000008aULL, (uint64_t)0x0000000000000088ULL,
(uint64_t)0x0000000080008009ULL, (uint64_t)0x000000008000000aULL,
(uint64_t)0x000000008000808bULL, (uint64_t)0x800000000000008bULL,
(uint64_t)0x8000000000008089ULL, (uint64_t)0x8000000000008003ULL,
(uint64_t)0x8000000000008002ULL, (uint64_t)0x8000000000000080ULL,
(uint64_t)0x000000000000800aULL, (uint64_t)0x800000008000000aULL,
(uint64_t)0x8000000080008081ULL, (uint64_t)0x8000000000008080ULL,
(uint64_t)0x0000000080000001ULL, (uint64_t)0x8000000080008008ULL};
/*************************************************
* Name: KeccakF1600_StatePermute
*
* Description: The Keccak F1600 Permutation
*
* Arguments: - uint64_t *state: pointer to input/output Keccak state
**************************************************/
static void KeccakF1600_StatePermute(uint64_t *state) {
int round;
uint64_t Aba, Abe, Abi, Abo, Abu;
uint64_t Aga, Age, Agi, Ago, Agu;
uint64_t Aka, Ake, Aki, Ako, Aku;
uint64_t Ama, Ame, Ami, Amo, Amu;
uint64_t Asa, Ase, Asi, Aso, Asu;
uint64_t BCa, BCe, BCi, BCo, BCu;
uint64_t Da, De, Di, Do, Du;
uint64_t Eba, Ebe, Ebi, Ebo, Ebu;
uint64_t Ega, Ege, Egi, Ego, Egu;
uint64_t Eka, Eke, Eki, Eko, Eku;
uint64_t Ema, Eme, Emi, Emo, Emu;
uint64_t Esa, Ese, Esi, Eso, Esu;
// copyFromState(A, state)
Aba = state[0];
Abe = state[1];
Abi = state[2];
Abo = state[3];
Abu = state[4];
Aga = state[5];
Age = state[6];
Agi = state[7];
Ago = state[8];
Agu = state[9];
Aka = state[10];
Ake = state[11];
Aki = state[12];
Ako = state[13];
Aku = state[14];
Ama = state[15];
Ame = state[16];
Ami = state[17];
Amo = state[18];
Amu = state[19];
Asa = state[20];
Ase = state[21];
Asi = state[22];
Aso = state[23];
Asu = state[24];
for (round = 0; round < NROUNDS; round += 2) {
// prepareTheta
BCa = Aba ^ Aga ^ Aka ^ Ama ^ Asa;
BCe = Abe ^ Age ^ Ake ^ Ame ^ Ase;
BCi = Abi ^ Agi ^ Aki ^ Ami ^ Asi;
BCo = Abo ^ Ago ^ Ako ^ Amo ^ Aso;
BCu = Abu ^ Agu ^ Aku ^ Amu ^ Asu;
// thetaRhoPiChiIotaPrepareTheta(round , A, E)
Da = BCu ^ ROL(BCe, 1);
De = BCa ^ ROL(BCi, 1);
Di = BCe ^ ROL(BCo, 1);
Do = BCi ^ ROL(BCu, 1);
Du = BCo ^ ROL(BCa, 1);
Aba ^= Da;
BCa = Aba;
Age ^= De;
BCe = ROL(Age, 44);
Aki ^= Di;
BCi = ROL(Aki, 43);
Amo ^= Do;
BCo = ROL(Amo, 21);
Asu ^= Du;
BCu = ROL(Asu, 14);
Eba = BCa ^ ((~BCe) & BCi);
Eba ^= KeccakF_RoundConstants[round];
Ebe = BCe ^ ((~BCi) & BCo);
Ebi = BCi ^ ((~BCo) & BCu);
Ebo = BCo ^ ((~BCu) & BCa);
Ebu = BCu ^ ((~BCa) & BCe);
Abo ^= Do;
BCa = ROL(Abo, 28);
Agu ^= Du;
BCe = ROL(Agu, 20);
Aka ^= Da;
BCi = ROL(Aka, 3);
Ame ^= De;
BCo = ROL(Ame, 45);
Asi ^= Di;
BCu = ROL(Asi, 61);
Ega = BCa ^ ((~BCe) & BCi);
Ege = BCe ^ ((~BCi) & BCo);
Egi = BCi ^ ((~BCo) & BCu);
Ego = BCo ^ ((~BCu) & BCa);
Egu = BCu ^ ((~BCa) & BCe);
Abe ^= De;
BCa = ROL(Abe, 1);
Agi ^= Di;
BCe = ROL(Agi, 6);
Ako ^= Do;
BCi = ROL(Ako, 25);
Amu ^= Du;
BCo = ROL(Amu, 8);
Asa ^= Da;
BCu = ROL(Asa, 18);
Eka = BCa ^ ((~BCe) & BCi);
Eke = BCe ^ ((~BCi) & BCo);
Eki = BCi ^ ((~BCo) & BCu);
Eko = BCo ^ ((~BCu) & BCa);
Eku = BCu ^ ((~BCa) & BCe);
Abu ^= Du;
BCa = ROL(Abu, 27);
Aga ^= Da;
BCe = ROL(Aga, 36);
Ake ^= De;
BCi = ROL(Ake, 10);
Ami ^= Di;
BCo = ROL(Ami, 15);
Aso ^= Do;
BCu = ROL(Aso, 56);
Ema = BCa ^ ((~BCe) & BCi);
Eme = BCe ^ ((~BCi) & BCo);
Emi = BCi ^ ((~BCo) & BCu);
Emo = BCo ^ ((~BCu) & BCa);
Emu = BCu ^ ((~BCa) & BCe);
Abi ^= Di;
BCa = ROL(Abi, 62);
Ago ^= Do;
BCe = ROL(Ago, 55);
Aku ^= Du;
BCi = ROL(Aku, 39);
Ama ^= Da;
BCo = ROL(Ama, 41);
Ase ^= De;
BCu = ROL(Ase, 2);
Esa = BCa ^ ((~BCe) & BCi);
Ese = BCe ^ ((~BCi) & BCo);
Esi = BCi ^ ((~BCo) & BCu);
Eso = BCo ^ ((~BCu) & BCa);
Esu = BCu ^ ((~BCa) & BCe);
// prepareTheta
BCa = Eba ^ Ega ^ Eka ^ Ema ^ Esa;
BCe = Ebe ^ Ege ^ Eke ^ Eme ^ Ese;
BCi = Ebi ^ Egi ^ Eki ^ Emi ^ Esi;
BCo = Ebo ^ Ego ^ Eko ^ Emo ^ Eso;
BCu = Ebu ^ Egu ^ Eku ^ Emu ^ Esu;
// thetaRhoPiChiIotaPrepareTheta(round+1, E, A)
Da = BCu ^ ROL(BCe, 1);
De = BCa ^ ROL(BCi, 1);
Di = BCe ^ ROL(BCo, 1);
Do = BCi ^ ROL(BCu, 1);
Du = BCo ^ ROL(BCa, 1);
Eba ^= Da;
BCa = Eba;
Ege ^= De;
BCe = ROL(Ege, 44);
Eki ^= Di;
BCi = ROL(Eki, 43);
Emo ^= Do;
BCo = ROL(Emo, 21);
Esu ^= Du;
BCu = ROL(Esu, 14);
Aba = BCa ^ ((~BCe) & BCi);
Aba ^= KeccakF_RoundConstants[round + 1];
Abe = BCe ^ ((~BCi) & BCo);
Abi = BCi ^ ((~BCo) & BCu);
Abo = BCo ^ ((~BCu) & BCa);
Abu = BCu ^ ((~BCa) & BCe);
Ebo ^= Do;
BCa = ROL(Ebo, 28);
Egu ^= Du;
BCe = ROL(Egu, 20);
Eka ^= Da;
BCi = ROL(Eka, 3);
Eme ^= De;
BCo = ROL(Eme, 45);
Esi ^= Di;
BCu = ROL(Esi, 61);
Aga = BCa ^ ((~BCe) & BCi);
Age = BCe ^ ((~BCi) & BCo);
Agi = BCi ^ ((~BCo) & BCu);
Ago = BCo ^ ((~BCu) & BCa);
Agu = BCu ^ ((~BCa) & BCe);
Ebe ^= De;
BCa = ROL(Ebe, 1);
Egi ^= Di;
BCe = ROL(Egi, 6);
Eko ^= Do;
BCi = ROL(Eko, 25);
Emu ^= Du;
BCo = ROL(Emu, 8);
Esa ^= Da;
BCu = ROL(Esa, 18);
Aka = BCa ^ ((~BCe) & BCi);
Ake = BCe ^ ((~BCi) & BCo);
Aki = BCi ^ ((~BCo) & BCu);
Ako = BCo ^ ((~BCu) & BCa);
Aku = BCu ^ ((~BCa) & BCe);
Ebu ^= Du;
BCa = ROL(Ebu, 27);
Ega ^= Da;
BCe = ROL(Ega, 36);
Eke ^= De;
BCi = ROL(Eke, 10);
Emi ^= Di;
BCo = ROL(Emi, 15);
Eso ^= Do;
BCu = ROL(Eso, 56);
Ama = BCa ^ ((~BCe) & BCi);
Ame = BCe ^ ((~BCi) & BCo);
Ami = BCi ^ ((~BCo) & BCu);
Amo = BCo ^ ((~BCu) & BCa);
Amu = BCu ^ ((~BCa) & BCe);
Ebi ^= Di;
BCa = ROL(Ebi, 62);
Ego ^= Do;
BCe = ROL(Ego, 55);
Eku ^= Du;
BCi = ROL(Eku, 39);
Ema ^= Da;
BCo = ROL(Ema, 41);
Ese ^= De;
BCu = ROL(Ese, 2);
Asa = BCa ^ ((~BCe) & BCi);
Ase = BCe ^ ((~BCi) & BCo);
Asi = BCi ^ ((~BCo) & BCu);
Aso = BCo ^ ((~BCu) & BCa);
Asu = BCu ^ ((~BCa) & BCe);
}
// copyToState(state, A)
state[0] = Aba;
state[1] = Abe;
state[2] = Abi;
state[3] = Abo;
state[4] = Abu;
state[5] = Aga;
state[6] = Age;
state[7] = Agi;
state[8] = Ago;
state[9] = Agu;
state[10] = Aka;
state[11] = Ake;
state[12] = Aki;
state[13] = Ako;
state[14] = Aku;
state[15] = Ama;
state[16] = Ame;
state[17] = Ami;
state[18] = Amo;
state[19] = Amu;
state[20] = Asa;
state[21] = Ase;
state[22] = Asi;
state[23] = Aso;
state[24] = Asu;
}
/*************************************************
* Name: keccak_absorb
*
* Description: Absorb step of Keccak;
* non-incremental, starts by zeroeing the state.
*
* Arguments: - uint64_t *s: pointer to (uninitialized) output Keccak state
* - unsigned int r: rate in bytes (e.g., 168 for SHAKE128)
* - const unsigned char *m: pointer to input to be absorbed into s
* - unsigned long long mlen: length of input in bytes
* - unsigned char p: domain-separation byte for different
* Keccak-derived functions
**************************************************/
static void keccak_absorb(uint64_t *s, unsigned int r, const unsigned char *m,
unsigned long long mlen, unsigned char p) {
unsigned int i;
unsigned char t[200];
/* Zero state */
for (i = 0; i < 25; ++i) {
s[i] = 0;
}
while (mlen >= r) {
for (i = 0; i < r / 8; ++i) {
s[i] ^= load64(m + 8 * i);
}
KeccakF1600_StatePermute(s);
mlen -= 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);
}
}
/*************************************************
* Name: keccak_squeezeblocks
*
* Description: Squeeze step of Keccak. Squeezes full blocks of r bytes each.
* Modifies the state. Can be called multiple times to keep
* squeezing, i.e., is incremental.
*
* Arguments: - unsigned char *h: pointer to output blocks
* - unsigned long long int nblocks: number of blocks to be
* squeezed (written to h)
* - uint64_t *s: pointer to input/output Keccak state
* - unsigned int r: rate in bytes (e.g., 168 for SHAKE128)
**************************************************/
static void keccak_squeezeblocks(unsigned char *h, unsigned long 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--;
}
}
/*************************************************
* Name: shake128_absorb
*
* Description: Absorb step of the SHAKE128 XOF.
* non-incremental, starts by zeroeing the state.
*
* Arguments: - uint64_t *s: pointer to (uninitialized) output Keccak state
* - const unsigned char *input: pointer to input to be absorbed
* into s
* - unsigned long long inlen: length of input in bytes
**************************************************/
void shake128_absorb(uint64_t *s, const unsigned char *input,
unsigned long long inlen) {
keccak_absorb(s, SHAKE128_RATE, input, inlen, 0x1F);
}
/*************************************************
* Name: shake128_squeezeblocks
*
* Description: Squeeze step of SHAKE128 XOF. Squeezes full blocks of
* SHAKE128_RATE bytes each. Modifies the state. Can be called
* multiple times to keep squeezing, i.e., is incremental.
*
* Arguments: - unsigned char *output: pointer to output blocks
* - unsigned long long nblocks: number of blocks to be squeezed
* (written to output)
* - uint64_t *s: pointer to input/output Keccak state
**************************************************/
void shake128_squeezeblocks(unsigned char *output, unsigned long nblocks,
uint64_t *s) {
keccak_squeezeblocks(output, nblocks, s, SHAKE128_RATE);
}
/*************************************************
* Name: shake256_absorb
*
* Description: Absorb step of the SHAKE256 XOF.
* non-incremental, starts by zeroeing the state.
*
* Arguments: - uint64_t *s: pointer to (uninitialized) output Keccak state
* - const unsigned char *input: pointer to input to be absorbed
* into s
* - unsigned long long inlen: length of input in bytes
**************************************************/
void shake256_absorb(uint64_t *s, const unsigned char *input,
unsigned long long inlen) {
keccak_absorb(s, SHAKE256_RATE, input, inlen, 0x1F);
}
/*************************************************
* Name: shake256_squeezeblocks
*
* Description: Squeeze step of SHAKE256 XOF. Squeezes full blocks of
* SHAKE256_RATE bytes each. Modifies the state. Can be called
* multiple times to keep squeezing, i.e., is incremental.
*
* Arguments: - unsigned char *output: pointer to output blocks
* - unsigned long long nblocks: number of blocks to be squeezed
* (written to output)
* - uint64_t *s: pointer to input/output Keccak state
**************************************************/
void shake256_squeezeblocks(unsigned char *output, unsigned long nblocks,
uint64_t *s) {
keccak_squeezeblocks(output, nblocks, s, SHAKE256_RATE);
}
/*************************************************
* Name: shake128
*
* Description: SHAKE128 XOF with non-incremental API
*
* Arguments: - unsigned char *output: pointer to output
* - unsigned long long outlen: requested output length in bytes
* - const unsigned char *input: pointer to input
* - unsigned long long inlen: length of input in bytes
**************************************************/
void shake128(unsigned char *output, unsigned long long outlen,
const unsigned char *input, unsigned long long inlen) {
unsigned int i;
unsigned long nblocks = outlen / SHAKE128_RATE;
unsigned char t[SHAKE128_RATE];
uint64_t s[25];
shake128_absorb(s, input, inlen);
shake128_squeezeblocks(output, nblocks, s);
output += nblocks * SHAKE128_RATE;
outlen -= nblocks * SHAKE128_RATE;
if (outlen) {
shake128_squeezeblocks(t, 1, s);
for (i = 0; i < outlen; ++i) {
output[i] = t[i];
}
}
}
/*************************************************
* Name: shake256
*
* Description: SHAKE256 XOF with non-incremental API
*
* Arguments: - unsigned char *output: pointer to output
* - unsigned long long outlen: requested output length in bytes
* - const unsigned char *input: pointer to input
* - unsigned long long inlen: length of input in bytes
**************************************************/
void shake256(unsigned char *output, unsigned long long outlen,
const unsigned char *input, unsigned long long inlen) {
unsigned int i;
unsigned long nblocks = outlen / SHAKE256_RATE;
unsigned char t[SHAKE256_RATE];
uint64_t s[25];
shake256_absorb(s, input, inlen);
shake256_squeezeblocks(output, nblocks, s);
output += nblocks * SHAKE256_RATE;
outlen -= nblocks * SHAKE256_RATE;
if (outlen) {
shake256_squeezeblocks(t, 1, s);
for (i = 0; i < outlen; ++i) {
output[i] = t[i];
}
}
}
/*************************************************
* Name: sha3_256
*
* Description: SHA3-256 with non-incremental API
*
* Arguments: - unsigned char *output: pointer to output
* - const unsigned char *input: pointer to input
* - unsigned long long inlen: length of input in bytes
**************************************************/
void sha3_256(unsigned char *output, const unsigned char *input,
unsigned long long inlen) {
uint64_t s[25];
unsigned char t[SHA3_256_RATE];
size_t i;
/* Absorb input */
keccak_absorb(s, SHA3_256_RATE, input, inlen, 0x06);
/* Squeeze output */
keccak_squeezeblocks(t, 1, s, SHA3_256_RATE);
for (i = 0; i < 32; i++) {
output[i] = t[i];
}
}
/*************************************************
* Name: sha3_512
*
* Description: SHA3-512 with non-incremental API
*
* Arguments: - unsigned char *output: pointer to output
* - const unsigned char *input: pointer to input
* - unsigned long long inlen: length of input in bytes
**************************************************/
void sha3_512(unsigned char *output, const unsigned char *input,
unsigned long long inlen) {
uint64_t s[25];
unsigned char t[SHA3_512_RATE];
size_t i;
/* Absorb input */
keccak_absorb(s, SHA3_512_RATE, input, inlen, 0x06);
/* Squeeze output */
keccak_squeezeblocks(t, 1, s, SHA3_512_RATE);
for (i = 0; i < 64; i++) {
output[i] = t[i];
}
}
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