diff options
| -rw-r--r-- | src/liblzma/check/sha256.c | 25 |
1 files changed, 16 insertions, 9 deletions
diff --git a/src/liblzma/check/sha256.c b/src/liblzma/check/sha256.c index 0d3bc9e7..376401d5 100644 --- a/src/liblzma/check/sha256.c +++ b/src/liblzma/check/sha256.c @@ -47,11 +47,12 @@ #define g(i) T[(6 - i) & 7] #define h(i) T[(7 - i) & 7] -#define R(i) \ - h(i) += S1(e(i)) + Ch(e(i), f(i), g(i)) + SHA256_K[i + j] \ - + (j ? blk2(i) : blk0(i)); \ +#define R(i, j, blk) \ + h(i) += S1(e(i)) + Ch(e(i), f(i), g(i)) + SHA256_K[i + j] + blk; \ d(i) += h(i); \ h(i) += S0(a(i)) + Maj(a(i), b(i), c(i)) +#define R0(i) R(i, 0, blk0(i)) +#define R2(i) R(i, j, blk2(i)) #define S0(x) (rotr_32(x, 2) ^ rotr_32(x, 13) ^ rotr_32(x, 22)) #define S1(x) (rotr_32(x, 6) ^ rotr_32(x, 11) ^ rotr_32(x, 25)) @@ -88,12 +89,18 @@ transform(uint32_t state[8], const uint32_t data[16]) // Copy state[] to working vars. memcpy(T, state, sizeof(T)); - // 64 operations, partially loop unrolled - for (unsigned int j = 0; j < 64; j += 16) { - R( 0); R( 1); R( 2); R( 3); - R( 4); R( 5); R( 6); R( 7); - R( 8); R( 9); R(10); R(11); - R(12); R(13); R(14); R(15); + // The first 16 operations unrolled + R0( 0); R0( 1); R0( 2); R0( 3); + R0( 4); R0( 5); R0( 6); R0( 7); + R0( 8); R0( 9); R0(10); R0(11); + R0(12); R0(13); R0(14); R0(15); + + // The remaining 48 operations partially unrolled + for (unsigned int j = 16; j < 64; j += 16) { + R2( 0); R2( 1); R2( 2); R2( 3); + R2( 4); R2( 5); R2( 6); R2( 7); + R2( 8); R2( 9); R2(10); R2(11); + R2(12); R2(13); R2(14); R2(15); } // Add the working vars back into state[]. |