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sha1: compile-time endianness check for some compilers

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Newer gcc and clang provide macro __BYTE_ORDER__.
This commit is contained in:
Dmitry Podgorny
2014-10-25 16:37:21 +03:00
parent a3f1b83f3a
commit 9f82aac8ce
1 changed files with 13 additions and 2 deletions
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15
src/sha1.c
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@@ -124,11 +124,22 @@ void SHAPrintContext(SHA1_CTX *context, char *msg){
static uint32_t host_to_be(uint32_t i)
{
#define le_to_be(i) ((rol((i),24) & 0xFF00FF00) | (rol((i),8) & 0x00FF00FF))
#if defined(__BIG_ENDIAN__) || \
(defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && \
__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
return i;
#elif defined(__LITTLE_ENDIAN__) || \
(defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && \
__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
return le_to_be(i);
#else /* fallback to run-time check */
static const union {
unsigned u;
uint32_t u;
unsigned char c;
} check = {1};
return check.c ? (rol(i,24)&0xFF00FF00)|(rol(i,8)&0x00FF00FF) : i;
return check.c ? le_to_be(i) : i;
#endif
}
/* Hash a single 512-bit block. This is the core of the algorithm. */