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Add domain separation to NewHope

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NewHope announced a new version of their specification that adds
explicit domain separation. This is a port of
https://github.com/newhopecrypto/newhope/commit/607a9d3
This commit is contained in:
Ko- 2020-05-29 16:41:41 +02:00 committed by Kris Kwiatkowski
parent 4409c6f44f
commit f5bc4052c7
8 changed files with 46 additions and 34 deletions
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5
crypto_kem/newhope1024cca/clean/cpapke.c
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@ -101,8 +101,9 @@ void PQCLEAN_NEWHOPE1024CCA_CLEAN_cpapke_keypair(unsigned char *pk,
unsigned char *publicseed = z; unsigned char *publicseed = z;
unsigned char *noiseseed = z + NEWHOPE_SYMBYTES; unsigned char *noiseseed = z + NEWHOPE_SYMBYTES;
randombytes(z, NEWHOPE_SYMBYTES); z[0] = 0x01;
shake256(z, 2 * NEWHOPE_SYMBYTES, z, NEWHOPE_SYMBYTES); randombytes(z + 1, NEWHOPE_SYMBYTES);
shake256(z, 2 * NEWHOPE_SYMBYTES, z, NEWHOPE_SYMBYTES + 1);
gen_a(&ahat, publicseed); gen_a(&ahat, publicseed);

25
crypto_kem/newhope1024cca/clean/kem.c
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@ -52,16 +52,18 @@ int PQCLEAN_NEWHOPE1024CCA_CLEAN_crypto_kem_keypair(unsigned char *pk, unsigned
**************************************************/ **************************************************/
int PQCLEAN_NEWHOPE1024CCA_CLEAN_crypto_kem_enc(unsigned char *ct, unsigned char *ss, const unsigned char *pk) { int PQCLEAN_NEWHOPE1024CCA_CLEAN_crypto_kem_enc(unsigned char *ct, unsigned char *ss, const unsigned char *pk) {
unsigned char k_coins_d[3 * NEWHOPE_SYMBYTES]; /* Will contain key, coins, qrom-hash */ unsigned char k_coins_d[3 * NEWHOPE_SYMBYTES]; /* Will contain key, coins, qrom-hash */
unsigned char buf[2 * NEWHOPE_SYMBYTES]; unsigned char buf[2 * NEWHOPE_SYMBYTES + 1];
int i; int i;
randombytes(buf, NEWHOPE_SYMBYTES); buf[0] = 0x04;
randombytes(buf + 1, NEWHOPE_SYMBYTES);
shake256(buf, NEWHOPE_SYMBYTES, buf, NEWHOPE_SYMBYTES); /* Don't release system RNG output */ shake256(buf + 1, NEWHOPE_SYMBYTES, buf, NEWHOPE_SYMBYTES + 1); /* Don't release system RNG output */
shake256(buf + NEWHOPE_SYMBYTES, NEWHOPE_SYMBYTES, pk, NEWHOPE_CCAKEM_PUBLICKEYBYTES); /* Multitarget countermeasure for coins + contributory KEM */ shake256(buf + 1 + NEWHOPE_SYMBYTES, NEWHOPE_SYMBYTES, pk, NEWHOPE_CCAKEM_PUBLICKEYBYTES); /* Multitarget countermeasure for coins + contributory KEM */
shake256(k_coins_d, 3 * NEWHOPE_SYMBYTES, buf, 2 * NEWHOPE_SYMBYTES); buf[0] = 0x08;
shake256(k_coins_d, 3 * NEWHOPE_SYMBYTES, buf, 2 * NEWHOPE_SYMBYTES + 1);
PQCLEAN_NEWHOPE1024CCA_CLEAN_cpapke_enc(ct, buf, pk, k_coins_d + NEWHOPE_SYMBYTES); /* coins are in k_coins_d+NEWHOPE_SYMBYTES */ PQCLEAN_NEWHOPE1024CCA_CLEAN_cpapke_enc(ct, buf + 1, pk, k_coins_d + NEWHOPE_SYMBYTES); /* coins are in k_coins_d+NEWHOPE_SYMBYTES */
for (i = 0; i < NEWHOPE_SYMBYTES; i++) { for (i = 0; i < NEWHOPE_SYMBYTES; i++) {
ct[i + NEWHOPE_CPAPKE_CIPHERTEXTBYTES] = k_coins_d[i + 2 * NEWHOPE_SYMBYTES]; /* copy Targhi-Unruh hash into ct */ ct[i + NEWHOPE_CPAPKE_CIPHERTEXTBYTES] = k_coins_d[i + 2 * NEWHOPE_SYMBYTES]; /* copy Targhi-Unruh hash into ct */
@ -89,18 +91,19 @@ int PQCLEAN_NEWHOPE1024CCA_CLEAN_crypto_kem_enc(unsigned char *ct, unsigned char
int PQCLEAN_NEWHOPE1024CCA_CLEAN_crypto_kem_dec(unsigned char *ss, const unsigned char *ct, const unsigned char *sk) { int PQCLEAN_NEWHOPE1024CCA_CLEAN_crypto_kem_dec(unsigned char *ss, const unsigned char *ct, const unsigned char *sk) {
int i, fail; int i, fail;
unsigned char ct_cmp[NEWHOPE_CCAKEM_CIPHERTEXTBYTES]; unsigned char ct_cmp[NEWHOPE_CCAKEM_CIPHERTEXTBYTES];
unsigned char buf[2 * NEWHOPE_SYMBYTES]; unsigned char buf[2 * NEWHOPE_SYMBYTES + 1];
unsigned char k_coins_d[3 * NEWHOPE_SYMBYTES]; /* Will contain key, coins, qrom-hash */ unsigned char k_coins_d[3 * NEWHOPE_SYMBYTES]; /* Will contain key, coins, qrom-hash */
const unsigned char *pk = sk + NEWHOPE_CPAPKE_SECRETKEYBYTES; const unsigned char *pk = sk + NEWHOPE_CPAPKE_SECRETKEYBYTES;
PQCLEAN_NEWHOPE1024CCA_CLEAN_cpapke_dec(buf, ct, sk); buf[0] = 0x08;
PQCLEAN_NEWHOPE1024CCA_CLEAN_cpapke_dec(buf + 1, ct, sk);
for (i = 0; i < NEWHOPE_SYMBYTES; i++) { /* Use hash of pk stored in sk */ for (i = 0; i < NEWHOPE_SYMBYTES; i++) { /* Use hash of pk stored in sk */
buf[NEWHOPE_SYMBYTES + i] = sk[NEWHOPE_CCAKEM_SECRETKEYBYTES - 2 * NEWHOPE_SYMBYTES + i]; buf[1 + NEWHOPE_SYMBYTES + i] = sk[NEWHOPE_CCAKEM_SECRETKEYBYTES - 2 * NEWHOPE_SYMBYTES + i];
} }
shake256(k_coins_d, 3 * NEWHOPE_SYMBYTES, buf, 2 * NEWHOPE_SYMBYTES); shake256(k_coins_d, 3 * NEWHOPE_SYMBYTES, buf, 2 * NEWHOPE_SYMBYTES + 1);
PQCLEAN_NEWHOPE1024CCA_CLEAN_cpapke_enc(ct_cmp, buf, pk, k_coins_d + NEWHOPE_SYMBYTES); /* coins are in k_coins_d+NEWHOPE_SYMBYTES */ PQCLEAN_NEWHOPE1024CCA_CLEAN_cpapke_enc(ct_cmp, buf + 1, pk, k_coins_d + NEWHOPE_SYMBYTES); /* coins are in k_coins_d+NEWHOPE_SYMBYTES */
for (i = 0; i < NEWHOPE_SYMBYTES; i++) { for (i = 0; i < NEWHOPE_SYMBYTES; i++) {
ct_cmp[i + NEWHOPE_CPAPKE_CIPHERTEXTBYTES] = k_coins_d[i + 2 * NEWHOPE_SYMBYTES]; ct_cmp[i + NEWHOPE_CPAPKE_CIPHERTEXTBYTES] = k_coins_d[i + 2 * NEWHOPE_SYMBYTES];

5
crypto_kem/newhope1024cpa/clean/cpapke.c
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@ -101,8 +101,9 @@ void PQCLEAN_NEWHOPE1024CPA_CLEAN_cpapke_keypair(unsigned char *pk,
unsigned char *publicseed = z; unsigned char *publicseed = z;
unsigned char *noiseseed = z + NEWHOPE_SYMBYTES; unsigned char *noiseseed = z + NEWHOPE_SYMBYTES;
randombytes(z, NEWHOPE_SYMBYTES); z[0] = 0x01;
shake256(z, 2 * NEWHOPE_SYMBYTES, z, NEWHOPE_SYMBYTES); randombytes(z + 1, NEWHOPE_SYMBYTES);
shake256(z, 2 * NEWHOPE_SYMBYTES, z, NEWHOPE_SYMBYTES + 1);
gen_a(&ahat, publicseed); gen_a(&ahat, publicseed);

5
crypto_kem/newhope1024cpa/clean/kem.c
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@ -39,9 +39,10 @@ int PQCLEAN_NEWHOPE1024CPA_CLEAN_crypto_kem_keypair(unsigned char *pk, unsigned
int PQCLEAN_NEWHOPE1024CPA_CLEAN_crypto_kem_enc(unsigned char *ct, unsigned char *ss, const unsigned char *pk) { int PQCLEAN_NEWHOPE1024CPA_CLEAN_crypto_kem_enc(unsigned char *ct, unsigned char *ss, const unsigned char *pk) {
unsigned char buf[2 * NEWHOPE_SYMBYTES]; unsigned char buf[2 * NEWHOPE_SYMBYTES];
randombytes(buf, NEWHOPE_SYMBYTES); buf[0] = 0x02;
randombytes(buf + 1, NEWHOPE_SYMBYTES);
shake256(buf, 2 * NEWHOPE_SYMBYTES, buf, NEWHOPE_SYMBYTES); /* Don't release system RNG output */ shake256(buf, 2 * NEWHOPE_SYMBYTES, buf, NEWHOPE_SYMBYTES + 1); /* Don't release system RNG output */
PQCLEAN_NEWHOPE1024CPA_CLEAN_cpapke_enc(ct, buf, pk, buf + NEWHOPE_SYMBYTES); /* coins are in buf+NEWHOPE_SYMBYTES */ PQCLEAN_NEWHOPE1024CPA_CLEAN_cpapke_enc(ct, buf, pk, buf + NEWHOPE_SYMBYTES); /* coins are in buf+NEWHOPE_SYMBYTES */

5
crypto_kem/newhope512cca/clean/cpapke.c
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@ -101,8 +101,9 @@ void PQCLEAN_NEWHOPE512CCA_CLEAN_cpapke_keypair(unsigned char *pk,
unsigned char *publicseed = z; unsigned char *publicseed = z;
unsigned char *noiseseed = z + NEWHOPE_SYMBYTES; unsigned char *noiseseed = z + NEWHOPE_SYMBYTES;
randombytes(z, NEWHOPE_SYMBYTES); z[0] = 0x01;
shake256(z, 2 * NEWHOPE_SYMBYTES, z, NEWHOPE_SYMBYTES); randombytes(z + 1, NEWHOPE_SYMBYTES);
shake256(z, 2 * NEWHOPE_SYMBYTES, z, NEWHOPE_SYMBYTES + 1);
gen_a(&ahat, publicseed); gen_a(&ahat, publicseed);

25
crypto_kem/newhope512cca/clean/kem.c
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@ -52,16 +52,18 @@ int PQCLEAN_NEWHOPE512CCA_CLEAN_crypto_kem_keypair(unsigned char *pk, unsigned c
**************************************************/ **************************************************/
int PQCLEAN_NEWHOPE512CCA_CLEAN_crypto_kem_enc(unsigned char *ct, unsigned char *ss, const unsigned char *pk) { int PQCLEAN_NEWHOPE512CCA_CLEAN_crypto_kem_enc(unsigned char *ct, unsigned char *ss, const unsigned char *pk) {
unsigned char k_coins_d[3 * NEWHOPE_SYMBYTES]; /* Will contain key, coins, qrom-hash */ unsigned char k_coins_d[3 * NEWHOPE_SYMBYTES]; /* Will contain key, coins, qrom-hash */
unsigned char buf[2 * NEWHOPE_SYMBYTES]; unsigned char buf[2 * NEWHOPE_SYMBYTES + 1];
int i; int i;
randombytes(buf, NEWHOPE_SYMBYTES); buf[0] = 0x04;
randombytes(buf + 1, NEWHOPE_SYMBYTES);
shake256(buf, NEWHOPE_SYMBYTES, buf, NEWHOPE_SYMBYTES); /* Don't release system RNG output */ shake256(buf + 1, NEWHOPE_SYMBYTES, buf, NEWHOPE_SYMBYTES + 1); /* Don't release system RNG output */
shake256(buf + NEWHOPE_SYMBYTES, NEWHOPE_SYMBYTES, pk, NEWHOPE_CCAKEM_PUBLICKEYBYTES); /* Multitarget countermeasure for coins + contributory KEM */ shake256(buf + 1 + NEWHOPE_SYMBYTES, NEWHOPE_SYMBYTES, pk, NEWHOPE_CCAKEM_PUBLICKEYBYTES); /* Multitarget countermeasure for coins + contributory KEM */
shake256(k_coins_d, 3 * NEWHOPE_SYMBYTES, buf, 2 * NEWHOPE_SYMBYTES); buf[0] = 0x08;
shake256(k_coins_d, 3 * NEWHOPE_SYMBYTES, buf, 2 * NEWHOPE_SYMBYTES + 1);
PQCLEAN_NEWHOPE512CCA_CLEAN_cpapke_enc(ct, buf, pk, k_coins_d + NEWHOPE_SYMBYTES); /* coins are in k_coins_d+NEWHOPE_SYMBYTES */ PQCLEAN_NEWHOPE512CCA_CLEAN_cpapke_enc(ct, buf + 1, pk, k_coins_d + NEWHOPE_SYMBYTES); /* coins are in k_coins_d+NEWHOPE_SYMBYTES */
for (i = 0; i < NEWHOPE_SYMBYTES; i++) { for (i = 0; i < NEWHOPE_SYMBYTES; i++) {
ct[i + NEWHOPE_CPAPKE_CIPHERTEXTBYTES] = k_coins_d[i + 2 * NEWHOPE_SYMBYTES]; /* copy Targhi-Unruh hash into ct */ ct[i + NEWHOPE_CPAPKE_CIPHERTEXTBYTES] = k_coins_d[i + 2 * NEWHOPE_SYMBYTES]; /* copy Targhi-Unruh hash into ct */
@ -89,18 +91,19 @@ int PQCLEAN_NEWHOPE512CCA_CLEAN_crypto_kem_enc(unsigned char *ct, unsigned char
int PQCLEAN_NEWHOPE512CCA_CLEAN_crypto_kem_dec(unsigned char *ss, const unsigned char *ct, const unsigned char *sk) { int PQCLEAN_NEWHOPE512CCA_CLEAN_crypto_kem_dec(unsigned char *ss, const unsigned char *ct, const unsigned char *sk) {
int i, fail; int i, fail;
unsigned char ct_cmp[NEWHOPE_CCAKEM_CIPHERTEXTBYTES]; unsigned char ct_cmp[NEWHOPE_CCAKEM_CIPHERTEXTBYTES];
unsigned char buf[2 * NEWHOPE_SYMBYTES]; unsigned char buf[2 * NEWHOPE_SYMBYTES + 1];
unsigned char k_coins_d[3 * NEWHOPE_SYMBYTES]; /* Will contain key, coins, qrom-hash */ unsigned char k_coins_d[3 * NEWHOPE_SYMBYTES]; /* Will contain key, coins, qrom-hash */
const unsigned char *pk = sk + NEWHOPE_CPAPKE_SECRETKEYBYTES; const unsigned char *pk = sk + NEWHOPE_CPAPKE_SECRETKEYBYTES;
PQCLEAN_NEWHOPE512CCA_CLEAN_cpapke_dec(buf, ct, sk); buf[0] = 0x08;
PQCLEAN_NEWHOPE512CCA_CLEAN_cpapke_dec(buf + 1, ct, sk);
for (i = 0; i < NEWHOPE_SYMBYTES; i++) { /* Use hash of pk stored in sk */ for (i = 0; i < NEWHOPE_SYMBYTES; i++) { /* Use hash of pk stored in sk */
buf[NEWHOPE_SYMBYTES + i] = sk[NEWHOPE_CCAKEM_SECRETKEYBYTES - 2 * NEWHOPE_SYMBYTES + i]; buf[1 + NEWHOPE_SYMBYTES + i] = sk[NEWHOPE_CCAKEM_SECRETKEYBYTES - 2 * NEWHOPE_SYMBYTES + i];
} }
shake256(k_coins_d, 3 * NEWHOPE_SYMBYTES, buf, 2 * NEWHOPE_SYMBYTES); shake256(k_coins_d, 3 * NEWHOPE_SYMBYTES, buf, 2 * NEWHOPE_SYMBYTES + 1);
PQCLEAN_NEWHOPE512CCA_CLEAN_cpapke_enc(ct_cmp, buf, pk, k_coins_d + NEWHOPE_SYMBYTES); /* coins are in k_coins_d+NEWHOPE_SYMBYTES */ PQCLEAN_NEWHOPE512CCA_CLEAN_cpapke_enc(ct_cmp, buf + 1, pk, k_coins_d + NEWHOPE_SYMBYTES); /* coins are in k_coins_d+NEWHOPE_SYMBYTES */
for (i = 0; i < NEWHOPE_SYMBYTES; i++) { for (i = 0; i < NEWHOPE_SYMBYTES; i++) {
ct_cmp[i + NEWHOPE_CPAPKE_CIPHERTEXTBYTES] = k_coins_d[i + 2 * NEWHOPE_SYMBYTES]; ct_cmp[i + NEWHOPE_CPAPKE_CIPHERTEXTBYTES] = k_coins_d[i + 2 * NEWHOPE_SYMBYTES];

5
crypto_kem/newhope512cpa/clean/cpapke.c
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@ -101,8 +101,9 @@ void PQCLEAN_NEWHOPE512CPA_CLEAN_cpapke_keypair(unsigned char *pk,
unsigned char *publicseed = z; unsigned char *publicseed = z;
unsigned char *noiseseed = z + NEWHOPE_SYMBYTES; unsigned char *noiseseed = z + NEWHOPE_SYMBYTES;
randombytes(z, NEWHOPE_SYMBYTES); z[0] = 0x01;
shake256(z, 2 * NEWHOPE_SYMBYTES, z, NEWHOPE_SYMBYTES); randombytes(z + 1, NEWHOPE_SYMBYTES);
shake256(z, 2 * NEWHOPE_SYMBYTES, z, NEWHOPE_SYMBYTES + 1);
gen_a(&ahat, publicseed); gen_a(&ahat, publicseed);

5
crypto_kem/newhope512cpa/clean/kem.c
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@ -39,9 +39,10 @@ int PQCLEAN_NEWHOPE512CPA_CLEAN_crypto_kem_keypair(unsigned char *pk, unsigned c
int PQCLEAN_NEWHOPE512CPA_CLEAN_crypto_kem_enc(unsigned char *ct, unsigned char *ss, const unsigned char *pk) { int PQCLEAN_NEWHOPE512CPA_CLEAN_crypto_kem_enc(unsigned char *ct, unsigned char *ss, const unsigned char *pk) {
unsigned char buf[2 * NEWHOPE_SYMBYTES]; unsigned char buf[2 * NEWHOPE_SYMBYTES];
randombytes(buf, NEWHOPE_SYMBYTES); buf[0] = 0x02;
randombytes(buf + 1, NEWHOPE_SYMBYTES);
shake256(buf, 2 * NEWHOPE_SYMBYTES, buf, NEWHOPE_SYMBYTES); /* Don't release system RNG output */ shake256(buf, 2 * NEWHOPE_SYMBYTES, buf, NEWHOPE_SYMBYTES + 1); /* Don't release system RNG output */
PQCLEAN_NEWHOPE512CPA_CLEAN_cpapke_enc(ct, buf, pk, buf + NEWHOPE_SYMBYTES); /* coins are in buf+NEWHOPE_SYMBYTES */ PQCLEAN_NEWHOPE512CPA_CLEAN_cpapke_enc(ct, buf, pk, buf + NEWHOPE_SYMBYTES); /* coins are in buf+NEWHOPE_SYMBYTES */