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Don't assume that substracting unrelated pointers is acceptable.

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Having to increment two pointers instead of one is the price to
pay for portability, but it's not that big of a deal here.
This commit is contained in:
Frank Denis
2015-11-27 01:06:54 +01:00
parent ef3a073d13
commit b40663a10c
1 changed files with 9 additions and 7 deletions
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src/libsodium/crypto_onetimeauth/poly1305/sse2/poly1305_sse2.c
+9 -7
View File
@@ -57,13 +57,15 @@ typedef struct poly1305_state_internal_t {
static inline void
poly1305_block_copy31(unsigned char *dst, const unsigned char *src, unsigned long long bytes)
{
unsigned long long offset = src - dst;
if (bytes & 16) { _mm_store_si128((xmmi *)(void *)dst, _mm_loadu_si128((xmmi *)(void *)(dst + offset))); dst += 16; }
if (bytes & 8) { *(uint64_t *)(void *)dst = *(uint64_t *)(void *)(dst + offset); dst += 8; }
if (bytes & 4) { *(uint32_t *)dst = *(uint32_t *)(dst + offset); dst += 4; }
if (bytes & 2) { *(uint16_t *)dst = *(uint16_t *)(dst + offset); dst += 2; }
if (bytes & 1) { *( unsigned char *)dst = *( unsigned char *)(dst + offset); }
if (bytes & 16) {
_mm_store_si128((xmmi *) (void *) dst,
_mm_loadu_si128((const xmmi *) (const void *) src));
src += 16; dst += 16;
}
if (bytes & 8) { memcpy(dst, src, 8); src += 8; dst += 8; }
if (bytes & 4) { memcpy(dst, src, 4); src += 4; dst += 4; }
if (bytes & 2) { memcpy(dst, src, 2); src += 2; dst += 2; }
if (bytes & 1) { *dst = *src; }
}
static POLY1305_NOINLINE void