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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-08-05 20:28:07 -0700 |
|---|---|---|
| committer | Junio C Hamano <gitster@pobox.com> | 2009-08-06 13:56:45 -0700 |
| commit | 139e3456ecf18fc03a75eda7a77441e8fec344b9 (patch) | |
| tree | bb0a056bbe77c0bc7d75ee095e17f5fb3a25f5a5 /block-sha1 | |
| parent | fd536d3439fa2a06730884df31e2e98c9006c947 (diff) | |
| download | git-139e3456ecf18fc03a75eda7a77441e8fec344b9.tar.gz git-139e3456ecf18fc03a75eda7a77441e8fec344b9.tar.xz | |
block-sha1: make the 'ntohl()' part of the first SHA1 loop
This helps a teeny bit. But what I -really- want to do is to avoid the
whole 80-array loop, and do the xor updates as I go along..
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'block-sha1')
| -rw-r--r-- | block-sha1/sha1.c | 28 |
1 files changed, 16 insertions, 12 deletions
diff --git a/block-sha1/sha1.c b/block-sha1/sha1.c index 698e435a3..13da511b7 100644 --- a/block-sha1/sha1.c +++ b/block-sha1/sha1.c @@ -100,27 +100,31 @@ static void blk_SHA1Block(blk_SHA_CTX *ctx, const unsigned int *data) unsigned int A,B,C,D,E,TEMP; unsigned int W[80]; - for (t = 0; t < 16; t++) - W[t] = htonl(data[t]); - - /* Unroll it? */ - for (t = 16; t <= 79; t++) - W[t] = SHA_ROL(W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16], 1); - A = ctx->H[0]; B = ctx->H[1]; C = ctx->H[2]; D = ctx->H[3]; E = ctx->H[4]; -#define T_0_19(t) \ +#define T_0_15(t) \ + TEMP = htonl(data[t]); W[t] = TEMP; \ + TEMP += SHA_ROL(A,5) + (((C^D)&B)^D) + E + 0x5a827999; \ + E = D; D = C; C = SHA_ROR(B, 2); B = A; A = TEMP; \ + + T_0_15( 0); T_0_15( 1); T_0_15( 2); T_0_15( 3); T_0_15( 4); + T_0_15( 5); T_0_15( 6); T_0_15( 7); T_0_15( 8); T_0_15( 9); + T_0_15(10); T_0_15(11); T_0_15(12); T_0_15(13); T_0_15(14); + T_0_15(15); + + /* Unroll it? */ + for (t = 16; t <= 79; t++) + W[t] = SHA_ROL(W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16], 1); + +#define T_16_19(t) \ TEMP = SHA_ROL(A,5) + (((C^D)&B)^D) + E + W[t] + 0x5a827999; \ E = D; D = C; C = SHA_ROR(B, 2); B = A; A = TEMP; - T_0_19( 0); T_0_19( 1); T_0_19( 2); T_0_19( 3); T_0_19( 4); - T_0_19( 5); T_0_19( 6); T_0_19( 7); T_0_19( 8); T_0_19( 9); - T_0_19(10); T_0_19(11); T_0_19(12); T_0_19(13); T_0_19(14); - T_0_19(15); T_0_19(16); T_0_19(17); T_0_19(18); T_0_19(19); + T_16_19(16); T_16_19(17); T_16_19(18); T_16_19(19); #define T_20_39(t) \ TEMP = SHA_ROL(A,5) + (B^C^D) + E + W[t] + 0x6ed9eba1; \ |