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arm-crypto-lib
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switching to dedicated endian switching function

This commit is contained in:
bg 2012-09-18 17:51:59 +02:00
parent fcac23afee
commit fb928c1c4c
1 changed files with 16 additions and 9 deletions
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25
sha1/sha1.c
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@ -57,11 +57,12 @@ uint32_t rotl32(uint32_t n, uint8_t bits){
return ((n<<bits) | (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);