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Eliminate a variable

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Dag-Erling Smørgrav 2014-07-11 10:10:50 +00:00 committed by des
parent 8f42136d40
commit 26b512bfd7
1 changed files with 65 additions and 71 deletions
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136
lib/digest/md5.c
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@ -86,112 +86,106 @@ md5_init(md5_ctx *ctx)
(a) += (((b) & (c)) | (~(b) & (d))); \ (a) += (((b) & (c)) | (~(b) & (d))); \
(a) += (x)[(i)] + md5_k[(i)]; \ (a) += (x)[(i)] + md5_k[(i)]; \
(a) = rol((a), (s)) + (b); \ (a) = rol((a), (s)) + (b); \
++(i); \
} while (0) } while (0)
#define md5_g(i, a, b, c, d, x, s) do { \ #define md5_g(i, a, b, c, d, x, s) do { \
(a) += (((b) & (d)) | ((c) & ~(d))); \ (a) += (((b) & (d)) | ((c) & ~(d))); \
(a) += (x)[(5 * (i) + 1) % 16] + md5_k[(i)]; \ (a) += (x)[(5 * (i) + 1) % 16] + md5_k[(i)]; \
(a) = rol((a), (s)) + (b); \ (a) = rol((a), (s)) + (b); \
++(i); \
} while (0) } while (0)
#define md5_h(i, a, b, c, d, x, s) do { \ #define md5_h(i, a, b, c, d, x, s) do { \
(a) += ((b) ^ (c) ^ (d)); \ (a) += ((b) ^ (c) ^ (d)); \
(a) += (x)[(3 * (i) + 5) % 16] + md5_k[(i)]; \ (a) += (x)[(3 * (i) + 5) % 16] + md5_k[(i)]; \
(a) = rol((a), (s)) + (b); \ (a) = rol((a), (s)) + (b); \
++(i); \
} while (0) } while (0)
#define md5_i(i, a, b, c, d, x, s) do { \ #define md5_i(i, a, b, c, d, x, s) do { \
(a) += ((c) ^ ((b) | ~(d))); \ (a) += ((c) ^ ((b) | ~(d))); \
(a) += (x)[(7 * (i)) % 16] + md5_k[(i)]; \ (a) += (x)[(7 * (i)) % 16] + md5_k[(i)]; \
(a) = rol((a), (s)) + (b); \ (a) = rol((a), (s)) + (b); \
++(i); \
} while (0) } while (0)
static void static void
md5_compute(md5_ctx *ctx, const uint8_t *block) md5_compute(md5_ctx *ctx, const uint8_t *block)
{ {
uint32_t w[16], a, b, c, d; uint32_t w[16], a, b, c, d;
int i;
memcpy(w, block, 64); memcpy(w, block, 64);
for (i = 0; i < 16; ++i) for (int i = 0; i < 16; ++i)
w[i] = le32toh(w[i]); w[i] = le32toh(w[i]);
a = ctx->h[0]; a = ctx->h[0];
b = ctx->h[1]; b = ctx->h[1];
c = ctx->h[2]; c = ctx->h[2];
d = ctx->h[3]; d = ctx->h[3];
i = 0;
md5_f(i, a, b, c, d, w, 7); md5_f( 0, a, b, c, d, w, 7);
md5_f(i, d, a, b, c, w, 12); md5_f( 1, d, a, b, c, w, 12);
md5_f(i, c, d, a, b, w, 17); md5_f( 2, c, d, a, b, w, 17);
md5_f(i, b, c, d, a, w, 22); md5_f( 3, b, c, d, a, w, 22);
md5_f(i, a, b, c, d, w, 7); md5_f( 4, a, b, c, d, w, 7);
md5_f(i, d, a, b, c, w, 12); md5_f( 5, d, a, b, c, w, 12);
md5_f(i, c, d, a, b, w, 17); md5_f( 6, c, d, a, b, w, 17);
md5_f(i, b, c, d, a, w, 22); md5_f( 7, b, c, d, a, w, 22);
md5_f(i, a, b, c, d, w, 7); md5_f( 8, a, b, c, d, w, 7);
md5_f(i, d, a, b, c, w, 12); md5_f( 9, d, a, b, c, w, 12);
md5_f(i, c, d, a, b, w, 17); md5_f(10, c, d, a, b, w, 17);
md5_f(i, b, c, d, a, w, 22); md5_f(11, b, c, d, a, w, 22);
md5_f(i, a, b, c, d, w, 7); md5_f(12, a, b, c, d, w, 7);
md5_f(i, d, a, b, c, w, 12); md5_f(13, d, a, b, c, w, 12);
md5_f(i, c, d, a, b, w, 17); md5_f(14, c, d, a, b, w, 17);
md5_f(i, b, c, d, a, w, 22); md5_f(15, b, c, d, a, w, 22);
md5_g(i, a, b, c, d, w, 5); md5_g(16, a, b, c, d, w, 5);
md5_g(i, d, a, b, c, w, 9); md5_g(17, d, a, b, c, w, 9);
md5_g(i, c, d, a, b, w, 14); md5_g(18, c, d, a, b, w, 14);
md5_g(i, b, c, d, a, w, 20); md5_g(19, b, c, d, a, w, 20);
md5_g(i, a, b, c, d, w, 5); md5_g(20, a, b, c, d, w, 5);
md5_g(i, d, a, b, c, w, 9); md5_g(21, d, a, b, c, w, 9);
md5_g(i, c, d, a, b, w, 14); md5_g(22, c, d, a, b, w, 14);
md5_g(i, b, c, d, a, w, 20); md5_g(23, b, c, d, a, w, 20);
md5_g(i, a, b, c, d, w, 5); md5_g(24, a, b, c, d, w, 5);
md5_g(i, d, a, b, c, w, 9); md5_g(25, d, a, b, c, w, 9);
md5_g(i, c, d, a, b, w, 14); md5_g(26, c, d, a, b, w, 14);
md5_g(i, b, c, d, a, w, 20); md5_g(27, b, c, d, a, w, 20);
md5_g(i, a, b, c, d, w, 5); md5_g(28, a, b, c, d, w, 5);
md5_g(i, d, a, b, c, w, 9); md5_g(29, d, a, b, c, w, 9);
md5_g(i, c, d, a, b, w, 14); md5_g(30, c, d, a, b, w, 14);
md5_g(i, b, c, d, a, w, 20); md5_g(31, b, c, d, a, w, 20);
md5_h(i, a, b, c, d, w, 4); md5_h(32, a, b, c, d, w, 4);
md5_h(i, d, a, b, c, w, 11); md5_h(33, d, a, b, c, w, 11);
md5_h(i, c, d, a, b, w, 16); md5_h(34, c, d, a, b, w, 16);
md5_h(i, b, c, d, a, w, 23); md5_h(35, b, c, d, a, w, 23);
md5_h(i, a, b, c, d, w, 4); md5_h(36, a, b, c, d, w, 4);
md5_h(i, d, a, b, c, w, 11); md5_h(37, d, a, b, c, w, 11);
md5_h(i, c, d, a, b, w, 16); md5_h(38, c, d, a, b, w, 16);
md5_h(i, b, c, d, a, w, 23); md5_h(39, b, c, d, a, w, 23);
md5_h(i, a, b, c, d, w, 4); md5_h(40, a, b, c, d, w, 4);
md5_h(i, d, a, b, c, w, 11); md5_h(41, d, a, b, c, w, 11);
md5_h(i, c, d, a, b, w, 16); md5_h(42, c, d, a, b, w, 16);
md5_h(i, b, c, d, a, w, 23); md5_h(43, b, c, d, a, w, 23);
md5_h(i, a, b, c, d, w, 4); md5_h(44, a, b, c, d, w, 4);
md5_h(i, d, a, b, c, w, 11); md5_h(45, d, a, b, c, w, 11);
md5_h(i, c, d, a, b, w, 16); md5_h(46, c, d, a, b, w, 16);
md5_h(i, b, c, d, a, w, 23); md5_h(47, b, c, d, a, w, 23);
md5_i(i, a, b, c, d, w, 6); md5_i(48, a, b, c, d, w, 6);
md5_i(i, d, a, b, c, w, 10); md5_i(49, d, a, b, c, w, 10);
md5_i(i, c, d, a, b, w, 15); md5_i(50, c, d, a, b, w, 15);
md5_i(i, b, c, d, a, w, 21); md5_i(51, b, c, d, a, w, 21);
md5_i(i, a, b, c, d, w, 6); md5_i(52, a, b, c, d, w, 6);
md5_i(i, d, a, b, c, w, 10); md5_i(53, d, a, b, c, w, 10);
md5_i(i, c, d, a, b, w, 15); md5_i(54, c, d, a, b, w, 15);
md5_i(i, b, c, d, a, w, 21); md5_i(55, b, c, d, a, w, 21);
md5_i(i, a, b, c, d, w, 6); md5_i(56, a, b, c, d, w, 6);
md5_i(i, d, a, b, c, w, 10); md5_i(57, d, a, b, c, w, 10);
md5_i(i, c, d, a, b, w, 15); md5_i(58, c, d, a, b, w, 15);
md5_i(i, b, c, d, a, w, 21); md5_i(59, b, c, d, a, w, 21);
md5_i(i, a, b, c, d, w, 6); md5_i(60, a, b, c, d, w, 6);
md5_i(i, d, a, b, c, w, 10); md5_i(61, d, a, b, c, w, 10);
md5_i(i, c, d, a, b, w, 15); md5_i(62, c, d, a, b, w, 15);
md5_i(i, b, c, d, a, w, 21); md5_i(63, b, c, d, a, w, 21);
ctx->h[0] += a; ctx->h[0] += a;
ctx->h[1] += b; ctx->h[1] += b;