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Unroll the loop in sha1_compute(), speeding it up by about 50%.

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Dag-Erling Smørgrav 2014-07-11 09:58:58 +00:00 committed by des
parent dffacacccf
commit fd77c1c38e
1 changed files with 94 additions and 17 deletions
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111
lib/digest/sha1.c
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@ -66,10 +66,23 @@ sha1_init(sha1_ctx *ctx)
memcpy(ctx->h, sha1_h, sizeof ctx->h); memcpy(ctx->h, sha1_h, sizeof ctx->h);
} }
#define sha1_ch(x, y, z) ((x & y) ^ (~x & z))
#define sha1_parity(x, y, z) ((x ^ y ^ z))
#define sha1_maj(x, y, z) (((x & y) ^ (x & z) ^ (y & z)))
#define sha1_step(t, a, f, e, w) \
do { \
uint32_t T = rol(a, 5) + f + e + sha1_k[t/20] + w[t]; \
e = d; \
d = c; \
c = rol(b, 30); \
b = a; \
a = T; \
} while (0)
static void static void
sha1_compute(sha1_ctx *ctx, const uint8_t *block) sha1_compute(sha1_ctx *ctx, const uint8_t *block)
{ {
uint32_t w[80], a, b, c, d, e, f, temp; uint32_t w[80], a, b, c, d, e;
memcpy(w, block, 64); memcpy(w, block, 64);
#if !WORDS_BIGENDIAN #if !WORDS_BIGENDIAN
@ -85,22 +98,86 @@ sha1_compute(sha1_ctx *ctx, const uint8_t *block)
c = ctx->h[2]; c = ctx->h[2];
d = ctx->h[3]; d = ctx->h[3];
e = ctx->h[4]; e = ctx->h[4];
for (int t = 0; t < 80; ++t) { sha1_step( 0, a, sha1_ch(b, c, d), e, w);
if (t < 20) sha1_step( 1, a, sha1_ch(b, c, d), e, w);
f = (b & c) ^ ((~b) & d); sha1_step( 2, a, sha1_ch(b, c, d), e, w);
else if (t < 40) sha1_step( 3, a, sha1_ch(b, c, d), e, w);
f = b ^ c ^ d; sha1_step( 4, a, sha1_ch(b, c, d), e, w);
else if (t < 60) sha1_step( 5, a, sha1_ch(b, c, d), e, w);
f = (b & c) ^ (b & d) ^ (c & d); sha1_step( 6, a, sha1_ch(b, c, d), e, w);
else sha1_step( 7, a, sha1_ch(b, c, d), e, w);
f = b ^ c ^ d; sha1_step( 8, a, sha1_ch(b, c, d), e, w);
temp = rol(a, 5) + f + e + w[t] + sha1_k[t/20]; sha1_step( 9, a, sha1_ch(b, c, d), e, w);
e = d; sha1_step(10, a, sha1_ch(b, c, d), e, w);
d = c; sha1_step(11, a, sha1_ch(b, c, d), e, w);
c = ror(b, 2); sha1_step(12, a, sha1_ch(b, c, d), e, w);
b = a; sha1_step(13, a, sha1_ch(b, c, d), e, w);
a = temp; sha1_step(14, a, sha1_ch(b, c, d), e, w);
} sha1_step(15, a, sha1_ch(b, c, d), e, w);
sha1_step(16, a, sha1_ch(b, c, d), e, w);
sha1_step(17, a, sha1_ch(b, c, d), e, w);
sha1_step(18, a, sha1_ch(b, c, d), e, w);
sha1_step(19, a, sha1_ch(b, c, d), e, w);
sha1_step(20, a, sha1_parity(b, c, d), e, w);
sha1_step(21, a, sha1_parity(b, c, d), e, w);
sha1_step(22, a, sha1_parity(b, c, d), e, w);
sha1_step(23, a, sha1_parity(b, c, d), e, w);
sha1_step(24, a, sha1_parity(b, c, d), e, w);
sha1_step(25, a, sha1_parity(b, c, d), e, w);
sha1_step(26, a, sha1_parity(b, c, d), e, w);
sha1_step(27, a, sha1_parity(b, c, d), e, w);
sha1_step(28, a, sha1_parity(b, c, d), e, w);
sha1_step(29, a, sha1_parity(b, c, d), e, w);
sha1_step(30, a, sha1_parity(b, c, d), e, w);
sha1_step(31, a, sha1_parity(b, c, d), e, w);
sha1_step(32, a, sha1_parity(b, c, d), e, w);
sha1_step(33, a, sha1_parity(b, c, d), e, w);
sha1_step(34, a, sha1_parity(b, c, d), e, w);
sha1_step(35, a, sha1_parity(b, c, d), e, w);
sha1_step(36, a, sha1_parity(b, c, d), e, w);
sha1_step(37, a, sha1_parity(b, c, d), e, w);
sha1_step(38, a, sha1_parity(b, c, d), e, w);
sha1_step(39, a, sha1_parity(b, c, d), e, w);
sha1_step(40, a, sha1_maj(b, c, d), e, w);
sha1_step(41, a, sha1_maj(b, c, d), e, w);
sha1_step(42, a, sha1_maj(b, c, d), e, w);
sha1_step(43, a, sha1_maj(b, c, d), e, w);
sha1_step(44, a, sha1_maj(b, c, d), e, w);
sha1_step(45, a, sha1_maj(b, c, d), e, w);
sha1_step(46, a, sha1_maj(b, c, d), e, w);
sha1_step(47, a, sha1_maj(b, c, d), e, w);
sha1_step(48, a, sha1_maj(b, c, d), e, w);
sha1_step(49, a, sha1_maj(b, c, d), e, w);
sha1_step(50, a, sha1_maj(b, c, d), e, w);
sha1_step(51, a, sha1_maj(b, c, d), e, w);
sha1_step(52, a, sha1_maj(b, c, d), e, w);
sha1_step(53, a, sha1_maj(b, c, d), e, w);
sha1_step(54, a, sha1_maj(b, c, d), e, w);
sha1_step(55, a, sha1_maj(b, c, d), e, w);
sha1_step(56, a, sha1_maj(b, c, d), e, w);
sha1_step(57, a, sha1_maj(b, c, d), e, w);
sha1_step(58, a, sha1_maj(b, c, d), e, w);
sha1_step(59, a, sha1_maj(b, c, d), e, w);
sha1_step(60, a, sha1_parity(b, c, d), e, w);
sha1_step(61, a, sha1_parity(b, c, d), e, w);
sha1_step(62, a, sha1_parity(b, c, d), e, w);
sha1_step(63, a, sha1_parity(b, c, d), e, w);
sha1_step(64, a, sha1_parity(b, c, d), e, w);
sha1_step(65, a, sha1_parity(b, c, d), e, w);
sha1_step(66, a, sha1_parity(b, c, d), e, w);
sha1_step(67, a, sha1_parity(b, c, d), e, w);
sha1_step(68, a, sha1_parity(b, c, d), e, w);
sha1_step(69, a, sha1_parity(b, c, d), e, w);
sha1_step(70, a, sha1_parity(b, c, d), e, w);
sha1_step(71, a, sha1_parity(b, c, d), e, w);
sha1_step(72, a, sha1_parity(b, c, d), e, w);
sha1_step(73, a, sha1_parity(b, c, d), e, w);
sha1_step(74, a, sha1_parity(b, c, d), e, w);
sha1_step(75, a, sha1_parity(b, c, d), e, w);
sha1_step(76, a, sha1_parity(b, c, d), e, w);
sha1_step(77, a, sha1_parity(b, c, d), e, w);
sha1_step(78, a, sha1_parity(b, c, d), e, w);
sha1_step(79, a, sha1_parity(b, c, d), e, w);
ctx->h[0] += a; ctx->h[0] += a;
ctx->h[1] += b; ctx->h[1] += b;
ctx->h[2] += c; ctx->h[2] += c;