switching to dedicated endian switching function

This commit is contained in:
bg 2012-09-18 17:45:19 +02:00
parent be13e6b437
commit 8b5e2b5775
2 changed files with 27 additions and 13 deletions

View File

@ -46,7 +46,6 @@ uint64_t sha2_large_common_const[80] = {
0x4cc5d4becb3e42b6LL, 0x597f299cfc657e2aLL, 0x5fcb6fab3ad6faecLL, 0x6c44198c4a475817LL 0x4cc5d4becb3e42b6LL, 0x597f299cfc657e2aLL, 0x5fcb6fab3ad6faecLL, 0x6c44198c4a475817LL
}; };
static const static const
uint64_t change_endian64(uint64_t x){ uint64_t change_endian64(uint64_t x){
uint64_t r=0; uint64_t r=0;
@ -59,8 +58,6 @@ uint64_t change_endian64(uint64_t x){
return r; return r;
} }
static const static const
uint64_t rotr64(uint64_t x, uint8_t n){ uint64_t rotr64(uint64_t x, uint8_t n){
return (x>>n)|(x<<(64-n)); return (x>>n)|(x<<(64-n));
@ -78,17 +75,26 @@ uint64_t rotl64(uint64_t x, uint8_t n){
#define SIGMA_a(x) (rotr64((x), 1) ^ rotr64((x), 8) ^ ((x)>>7)) #define SIGMA_a(x) (rotr64((x), 1) ^ rotr64((x), 8) ^ ((x)>>7))
#define SIGMA_b(x) (rotr64((x), 19) ^ rotl64((x), 3) ^ ((x)>>6)) #define SIGMA_b(x) (rotr64((x), 19) ^ rotl64((x), 3) ^ ((x)>>6))
static
void load_endian64_changed(uint8_t* dest, uint8_t* src, uint16_t words){
uint8_t i;
while(words--){
i = 7;
do{
*dest++ = src[i];
}while(i--);
src += 8;
}
}
void sha2_large_common_nextBlock(sha2_large_common_ctx_t* ctx, const void* block){ void sha2_large_common_nextBlock(sha2_large_common_ctx_t* ctx, const void* block){
uint64_t w[16], wx; uint64_t w[16], wx;
uint64_t a[8]; uint64_t a[8];
uint64_t t1, t2; uint64_t t1, t2;
const uint64_t *k=sha2_large_common_const; const uint64_t *k=sha2_large_common_const;
uint8_t i; uint8_t i;
i=16;
do{ load_endian64_changed((uint8_t*)w, (uint8_t*)block, 16);
w[16-i] = change_endian64(*((const uint64_t*)block));
block = (uint8_t*)block + 8;
}while(--i);
memcpy(a, ctx->h, 8*8); memcpy(a, ctx->h, 8*8);
for(i=0; i<80; ++i){ for(i=0; i<80; ++i){
if(i<16){ if(i<16){

View File

@ -40,11 +40,12 @@ uint32_t rotl32( uint32_t x, uint8_t n){
/*************************************************************************/ /*************************************************************************/
// #define CHANGE_ENDIAN32(x) (((x)<<24) | ((x)>>24) | (((x)& 0x0000ff00)<<8) | (((x)& 0x00ff0000)>>8)) // #define CHANGE_ENDIAN32(x) (((x)<<24) | ((x)>>24) | (((x)& 0x0000ff00)<<8) | (((x)& 0x00ff0000)>>8))
/*
static static
uint32_t change_endian32(uint32_t x){ uint32_t change_endian32(uint32_t x){
return (((x)<<24) | ((x)>>24) | (((x)& 0x0000ff00)<<8) | (((x)& 0x00ff0000)>>8)); return (((x)<<24) | ((x)>>24) | (((x)& 0x0000ff00)<<8) | (((x)& 0x00ff0000)>>8));
} }
*/
/* sha256 functions as macros for speed and size, cause they are called only once */ /* sha256 functions as macros for speed and size, cause they are called only once */
@ -68,7 +69,16 @@ uint32_t k[]={
0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
}; };
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;
}
}
/** /**
* block must be, 512, Bit = 64, Byte, long !!! * block must be, 512, Bit = 64, Byte, long !!!
@ -80,9 +90,7 @@ void sha2_small_common_nextBlock (sha2_small_common_ctx_t *state, const void* bl
/* init w */ /* init w */
#if defined LITTLE_ENDIAN #if defined LITTLE_ENDIAN
for (i=0; i<16; ++i){ load_endian32_changed((uint8_t*)w, (uint8_t*)block, 16);
w[i]= change_endian32(((uint32_t*)block)[i]);
}
#elif defined BIG_ENDIAN #elif defined BIG_ENDIAN
memcpy((void*)w, block, 64); memcpy((void*)w, block, 64);
#endif #endif