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Fix aliasing violations, even though we always disable strict aliasing

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This commit is contained in:
Frank Denis 2015-11-26 18:12:11 +01:00
parent a2540cb103
commit 04a59d0bb0
1 changed files with 31 additions and 11 deletions
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42
src/libsodium/crypto_aead/aes256gcm/aesni/aead_aes256gcm_aesni.c
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@ -173,7 +173,15 @@ aesni_encrypt1(unsigned char *out, __m128i nv, const __m128i *rkeys)
X(6); \
X(7)
#define COUNTER_INC2(N) (*(uint32_t *) &(N)[12]) = (2U + (((*(uint32_t *) &(N)[12]))))
#define COUNTER_INC2(N) \
{ \
void *xp = (void *) &(N)[12]; \
uint32_t x; \
\
memcpy(&x, xp, sizeof x); \
x += 2; \
memcpy(xp, &x, sizeof x); \
}
/* create a function of unrolling N ; the MAKEN is the unrolling
macro, defined above. The N in MAKEN must match N, obviously. */
@ -530,12 +538,18 @@ crypto_aead_aes256gcm_encrypt_afternm(unsigned char *c, unsigned long long *clen
abort();
}
memcpy(&n2[0], npub, 12);
*(uint32_t *) &n2[12] = 0x01000000;
{
const uint32_t one = 0x01000000;
memcpy(&n2[12], &one, sizeof one);
}
aesni_encrypt1(T, _mm_load_si128((const __m128i *) n2), rkeys);
(*(uint64_t *) &fb[0]) = _bswap64((uint64_t) (8 * adlen));
(*(uint64_t *) &fb[8]) = _bswap64((uint64_t) (8 * mlen));
{
uint64_t x;
x = _bswap64((uint64_t) (8 * adlen));
memcpy(&fb[0], &x, sizeof x);
x = _bswap64((uint64_t) (8 * mlen));
memcpy(&fb[8], &x, sizeof x);
}
/* we store H (and it's power) byte-reverted once and for all */
Hv = _mm_shuffle_epi8(_mm_load_si128((const __m128i *) H), rev);
_mm_store_si128((__m128i *) H, Hv);
@ -654,12 +668,18 @@ crypto_aead_aes256gcm_decrypt_afternm(unsigned char *m, unsigned long long *mlen
mlen = clen - 16;
memcpy(&n2[0], npub, 12);
*(uint32_t *) &n2[12] = 0x01000000;
{
const uint32_t one = 0x01000000;
memcpy(&n2[12], &one, sizeof one);
}
aesni_encrypt1(T, _mm_load_si128((const __m128i *) n2), rkeys);
(*(uint64_t *) &fb[0]) = _bswap64((uint64_t)(8 * adlen));
(*(uint64_t *) &fb[8]) = _bswap64((uint64_t)(8 * mlen));
{
uint64_t x;
x = _bswap64((uint64_t)(8 * adlen));
memcpy(&fb[0], &x, sizeof x);
x = _bswap64((uint64_t)(8 * mlen));
memcpy(&fb[8], &x, sizeof x);
}
memcpy(H, ctx->H, sizeof H);
Hv = _mm_shuffle_epi8(_mm_load_si128((const __m128i *) H), rev);
_mm_store_si128((__m128i *) H, Hv);