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Code Issues 1 Releases Wiki Activity

Avoid type-punning error when strict-aliasing turned on

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This commit is contained in:
Douglas Stebila 2020-03-13 17:00:32 -04:00
parent d7b739af13
commit d0d53ab52a
2 changed files with 30 additions and 20 deletions
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26
crypto_sign/falcon-1024/clean/rng.c
View File

@ -46,6 +46,9 @@ PQCLEAN_FALCON1024_CLEAN_prng_init(prng *p, inner_shake256_context *src) {
uint64_t th, tl; uint64_t th, tl;
int i; int i;
uint32_t *d32 = (uint32_t *) p->state.d;
uint64_t *d64 = (uint64_t *) p->state.d;
inner_shake256_extract(src, tmp, 56); inner_shake256_extract(src, tmp, 56);
for (i = 0; i < 14; i ++) { for (i = 0; i < 14; i ++) {
uint32_t w; uint32_t w;
@ -54,11 +57,11 @@ PQCLEAN_FALCON1024_CLEAN_prng_init(prng *p, inner_shake256_context *src) {
| ((uint32_t)tmp[(i << 2) + 1] << 8) | ((uint32_t)tmp[(i << 2) + 1] << 8)
| ((uint32_t)tmp[(i << 2) + 2] << 16) | ((uint32_t)tmp[(i << 2) + 2] << 16)
| ((uint32_t)tmp[(i << 2) + 3] << 24); | ((uint32_t)tmp[(i << 2) + 3] << 24);
*(uint32_t *)(p->state.d + (i << 2)) = w; d32[i] = w;
} }
tl = *(uint32_t *)(p->state.d + 48); tl = d32[48 / sizeof(uint32_t)];
th = *(uint32_t *)(p->state.d + 52); th = d32[52 / sizeof(uint32_t)];
*(uint64_t *)(p->state.d + 48) = tl + (th << 32); d64[48 / sizeof(uint64_t)] = tl + (th << 32);
PQCLEAN_FALCON1024_CLEAN_prng_refill(p); PQCLEAN_FALCON1024_CLEAN_prng_refill(p);
} }
@ -86,11 +89,14 @@ PQCLEAN_FALCON1024_CLEAN_prng_refill(prng *p) {
uint64_t cc; uint64_t cc;
size_t u; size_t u;
uint32_t *d32 = (uint32_t *) p->state.d;
uint64_t *d64 = (uint64_t *) p->state.d;
/* /*
* State uses local endianness. Only the output bytes must be * State uses local endianness. Only the output bytes must be
* converted to little endian (if used on a big-endian machine). * converted to little endian (if used on a big-endian machine).
*/ */
cc = *(uint64_t *)(p->state.d + 48); cc = d64[48 / sizeof(uint64_t)];
for (u = 0; u < 8; u ++) { for (u = 0; u < 8; u ++) {
uint32_t state[16]; uint32_t state[16];
size_t v; size_t v;
@ -134,12 +140,10 @@ PQCLEAN_FALCON1024_CLEAN_prng_refill(prng *p) {
state[v] += CW[v]; state[v] += CW[v];
} }
for (v = 4; v < 14; v ++) { for (v = 4; v < 14; v ++) {
state[v] += ((uint32_t *)p->state.d)[v - 4]; state[v] += d32[v - 4];
} }
state[14] += ((uint32_t *)p->state.d)[10] state[14] += d32[10] ^ (uint32_t)cc;
^ (uint32_t)cc; state[15] += d32[11] ^ (uint32_t)(cc >> 32);
state[15] += ((uint32_t *)p->state.d)[11]
^ (uint32_t)(cc >> 32);
cc ++; cc ++;
/* /*
@ -157,7 +161,7 @@ PQCLEAN_FALCON1024_CLEAN_prng_refill(prng *p) {
(uint8_t)(state[v] >> 24); (uint8_t)(state[v] >> 24);
} }
} }
*(uint64_t *)(p->state.d + 48) = cc; d64[48 / sizeof(uint64_t)] = cc;
p->ptr = 0; p->ptr = 0;

24
crypto_sign/falcon-512/clean/rng.c
View File

@ -46,6 +46,9 @@ PQCLEAN_FALCON512_CLEAN_prng_init(prng *p, inner_shake256_context *src) {
uint64_t th, tl; uint64_t th, tl;
int i; int i;
uint32_t *d32 = (uint32_t *) p->state.d;
uint64_t *d64 = (uint64_t *) p->state.d;
inner_shake256_extract(src, tmp, 56); inner_shake256_extract(src, tmp, 56);
for (i = 0; i < 14; i ++) { for (i = 0; i < 14; i ++) {
uint32_t w; uint32_t w;
@ -54,11 +57,11 @@ PQCLEAN_FALCON512_CLEAN_prng_init(prng *p, inner_shake256_context *src) {
| ((uint32_t)tmp[(i << 2) + 1] << 8) | ((uint32_t)tmp[(i << 2) + 1] << 8)
| ((uint32_t)tmp[(i << 2) + 2] << 16) | ((uint32_t)tmp[(i << 2) + 2] << 16)
| ((uint32_t)tmp[(i << 2) + 3] << 24); | ((uint32_t)tmp[(i << 2) + 3] << 24);
*(uint32_t *)(p->state.d + (i << 2)) = w; d32[i] = w;
} }
tl = *(uint32_t *)(p->state.d + 48); tl = d32[48 / sizeof(uint32_t)];
th = *(uint32_t *)(p->state.d + 52); th = d32[52 / sizeof(uint32_t)];
*(uint64_t *)(p->state.d + 48) = tl + (th << 32); d64[48 / sizeof(uint64_t)] = tl + (th << 32);
PQCLEAN_FALCON512_CLEAN_prng_refill(p); PQCLEAN_FALCON512_CLEAN_prng_refill(p);
} }
@ -86,11 +89,14 @@ PQCLEAN_FALCON512_CLEAN_prng_refill(prng *p) {
uint64_t cc; uint64_t cc;
size_t u; size_t u;
uint32_t *d32 = (uint32_t *) p->state.d;
uint64_t *d64 = (uint64_t *) p->state.d;
/* /*
* State uses local endianness. Only the output bytes must be * State uses local endianness. Only the output bytes must be
* converted to little endian (if used on a big-endian machine). * converted to little endian (if used on a big-endian machine).
*/ */
cc = *(uint64_t *)(p->state.d + 48); cc = d64[48 / sizeof(uint64_t)];
for (u = 0; u < 8; u ++) { for (u = 0; u < 8; u ++) {
uint32_t state[16]; uint32_t state[16];
size_t v; size_t v;
@ -134,11 +140,11 @@ PQCLEAN_FALCON512_CLEAN_prng_refill(prng *p) {
state[v] += CW[v]; state[v] += CW[v];
} }
for (v = 4; v < 14; v ++) { for (v = 4; v < 14; v ++) {
state[v] += ((uint32_t *)p->state.d)[v - 4]; state[v] += d32[v - 4];
} }
state[14] += ((uint32_t *)p->state.d)[10] state[14] += d32[10]
^ (uint32_t)cc; ^ (uint32_t)cc;
state[15] += ((uint32_t *)p->state.d)[11] state[15] += d32[11]
^ (uint32_t)(cc >> 32); ^ (uint32_t)(cc >> 32);
cc ++; cc ++;
@ -157,7 +163,7 @@ PQCLEAN_FALCON512_CLEAN_prng_refill(prng *p) {
(uint8_t)(state[v] >> 24); (uint8_t)(state[v] >> 24);
} }
} }
*(uint64_t *)(p->state.d + 48) = cc; d64[48 / sizeof(uint64_t)] = cc;
p->ptr = 0; p->ptr = 0;