From fb928c1c4c392b9e987631f84f1027af94e05beb Mon Sep 17 00:00:00 2001 From: bg Date: Tue, 18 Sep 2012 17:51:59 +0200 Subject: [PATCH] switching to dedicated endian switching function --- sha1/sha1.c | 25 ++++++++++++++++--------- 1 file changed, 16 insertions(+), 9 deletions(-) diff --git a/sha1/sha1.c b/sha1/sha1.c index d8249a4..79175ea 100644 --- a/sha1/sha1.c +++ b/sha1/sha1.c @@ -57,11 +57,12 @@ uint32_t rotl32(uint32_t n, uint8_t bits){ return ((n<>(32-bits))); } +/* static const uint32_t change_endian32(uint32_t x){ return (((x)<<24) | ((x)>>24) | (((x)& 0x0000ff00)<<8) | (((x)& 0x00ff0000)>>8)); } - +*/ /* three SHA-1 inner functions */ const @@ -90,6 +91,18 @@ uint32_t parity(uint32_t x, uint32_t y, uint32_t z){ typedef const uint32_t (*pf_t)(uint32_t x, uint32_t y, uint32_t z); +static +void load_endian32_changed(uint8_t* dest, uint8_t* src, uint16_t words){ + while(words--){ + *dest++ = src[3]; + *dest++ = src[2]; + *dest++ = src[1]; + *dest++ = src[0]; + src += 4; + } +} + + void sha1_nextBlock (sha1_ctx_t *state, const void* block){ uint32_t a[5]; uint32_t w[16]; @@ -102,10 +115,7 @@ void sha1_nextBlock (sha1_ctx_t *state, const void* block){ 0xca62c1d6}; /* load the w array (changing the endian and so) */ - for(t=0; t<16; ++t){ - w[t] = change_endian32(((uint32_t*)block)[t]); - } - + load_endian32_changed((uint8_t*)w, (uint8_t*)block, 16); #if DEBUG uint8_t dbgi; for(dbgi=0; dbgi<16; ++dbgi){ @@ -185,10 +195,7 @@ void sha1_lastBlock(sha1_ctx_t *state, const void* block, uint16_t length){ void sha1_ctx2hash (void *dest, sha1_ctx_t *state){ #if defined LITTLE_ENDIAN - uint8_t i; - for(i=0; i<5; ++i){ - ((uint32_t*)dest)[i] = change_endian32(state->h[i]); - } + load_endian32_changed((uint8_t*)dest, (uint8_t*)state->h, 5); #elif BIG_ENDIAN if (dest != state->h) memcpy(dest, state->h, SHA1_HASH_BITS/8); -- 2.39.2