/* vi:set ts=8 sts=4 sw=4 noet: * * VIM - Vi IMproved by Bram Moolenaar * * Do ":help uganda" in Vim to read copying and usage conditions. * Do ":help credits" in Vim to see a list of people who contributed. * See README.txt for an overview of the Vim source code. * * FIPS-180-2 compliant SHA-256 implementation * GPL by Christophe Devine, applies to older version. * Modified for md5deep, in public domain. * Modified For Vim, Mohsin Ahmed, http://www.cs.albany.edu/~mosh * Mohsin Ahmed states this work is distributed under the VIM License or GPL, * at your choice. */ #include "vim.h" #ifdef FEAT_PERSISTENT_UNDO #define GET_UINT32(n, b, i) \ { \ (n) = ((UINT32_T)(b)[(i)] << 24) | ((UINT32_T)(b)[(i) + 1] << 16) | ((UINT32_T)(b)[(i) + 2] << 8) | ((UINT32_T)(b)[(i) + 3]); \ } #define PUT_UINT32(n, b, i) \ { \ (b)[(i)] = (char_u)((n) >> 24); \ (b)[(i) + 1] = (char_u)((n) >> 16); \ (b)[(i) + 2] = (char_u)((n) >> 8); \ (b)[(i) + 3] = (char_u)((n)); \ } void sha256_start(context_sha256_T *ctx) { ctx->total[0] = 0; ctx->total[1] = 0; ctx->state[0] = 0x6A09E667; ctx->state[1] = 0xBB67AE85; ctx->state[2] = 0x3C6EF372; ctx->state[3] = 0xA54FF53A; ctx->state[4] = 0x510E527F; ctx->state[5] = 0x9B05688C; ctx->state[6] = 0x1F83D9AB; ctx->state[7] = 0x5BE0CD19; } static void sha256_process(context_sha256_T *ctx, char_u data[64]) { UINT32_T temp1, temp2, W[64]; UINT32_T A, B, C, D, E, F, G, H; GET_UINT32(W[0], data, 0); GET_UINT32(W[1], data, 4); GET_UINT32(W[2], data, 8); GET_UINT32(W[3], data, 12); GET_UINT32(W[4], data, 16); GET_UINT32(W[5], data, 20); GET_UINT32(W[6], data, 24); GET_UINT32(W[7], data, 28); GET_UINT32(W[8], data, 32); GET_UINT32(W[9], data, 36); GET_UINT32(W[10], data, 40); GET_UINT32(W[11], data, 44); GET_UINT32(W[12], data, 48); GET_UINT32(W[13], data, 52); GET_UINT32(W[14], data, 56); GET_UINT32(W[15], data, 60); #define SHR(x, n) ((x & 0xFFFFFFFF) >> n) #define ROTR(x, n) (SHR(x, n) | (x << (32 - n))) #define S0(x) (ROTR(x, 7) ^ ROTR(x, 18) ^ SHR(x, 3)) #define S1(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ SHR(x, 10)) #define S2(x) (ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22)) #define S3(x) (ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25)) #define F0(x, y, z) ((x & y) | (z & (x | y))) #define F1(x, y, z) (z ^ (x & (y ^ z))) #define R(t) \ ( \ W[t] = S1(W[t - 2]) + W[t - 7] + \ S0(W[t - 15]) + W[t - 16]) #define P(a, b, c, d, e, f, g, h, x, K) \ { \ temp1 = h + S3(e) + F1(e, f, g) + K + x; \ temp2 = S2(a) + F0(a, b, c); \ d += temp1; \ h = temp1 + temp2; \ } A = ctx->state[0]; B = ctx->state[1]; C = ctx->state[2]; D = ctx->state[3]; E = ctx->state[4]; F = ctx->state[5]; G = ctx->state[6]; H = ctx->state[7]; P(A, B, C, D, E, F, G, H, W[0], 0x428A2F98); P(H, A, B, C, D, E, F, G, W[1], 0x71374491); P(G, H, A, B, C, D, E, F, W[2], 0xB5C0FBCF); P(F, G, H, A, B, C, D, E, W[3], 0xE9B5DBA5); P(E, F, G, H, A, B, C, D, W[4], 0x3956C25B); P(D, E, F, G, H, A, B, C, W[5], 0x59F111F1); P(C, D, E, F, G, H, A, B, W[6], 0x923F82A4); P(B, C, D, E, F, G, H, A, W[7], 0xAB1C5ED5); P(A, B, C, D, E, F, G, H, W[8], 0xD807AA98); P(H, A, B, C, D, E, F, G, W[9], 0x12835B01); P(G, H, A, B, C, D, E, F, W[10], 0x243185BE); P(F, G, H, A, B, C, D, E, W[11], 0x550C7DC3); P(E, F, G, H, A, B, C, D, W[12], 0x72BE5D74); P(D, E, F, G, H, A, B, C, W[13], 0x80DEB1FE); P(C, D, E, F, G, H, A, B, W[14], 0x9BDC06A7); P(B, C, D, E, F, G, H, A, W[15], 0xC19BF174); P(A, B, C, D, E, F, G, H, R(16), 0xE49B69C1); P(H, A, B, C, D, E, F, G, R(17), 0xEFBE4786); P(G, H, A, B, C, D, E, F, R(18), 0x0FC19DC6); P(F, G, H, A, B, C, D, E, R(19), 0x240CA1CC); P(E, F, G, H, A, B, C, D, R(20), 0x2DE92C6F); P(D, E, F, G, H, A, B, C, R(21), 0x4A7484AA); P(C, D, E, F, G, H, A, B, R(22), 0x5CB0A9DC); P(B, C, D, E, F, G, H, A, R(23), 0x76F988DA); P(A, B, C, D, E, F, G, H, R(24), 0x983E5152); P(H, A, B, C, D, E, F, G, R(25), 0xA831C66D); P(G, H, A, B, C, D, E, F, R(26), 0xB00327C8); P(F, G, H, A, B, C, D, E, R(27), 0xBF597FC7); P(E, F, G, H, A, B, C, D, R(28), 0xC6E00BF3); P(D, E, F, G, H, A, B, C, R(29), 0xD5A79147); P(C, D, E, F, G, H, A, B, R(30), 0x06CA6351); P(B, C, D, E, F, G, H, A, R(31), 0x14292967); P(A, B, C, D, E, F, G, H, R(32), 0x27B70A85); P(H, A, B, C, D, E, F, G, R(33), 0x2E1B2138); P(G, H, A, B, C, D, E, F, R(34), 0x4D2C6DFC); P(F, G, H, A, B, C, D, E, R(35), 0x53380D13); P(E, F, G, H, A, B, C, D, R(36), 0x650A7354); P(D, E, F, G, H, A, B, C, R(37), 0x766A0ABB); P(C, D, E, F, G, H, A, B, R(38), 0x81C2C92E); P(B, C, D, E, F, G, H, A, R(39), 0x92722C85); P(A, B, C, D, E, F, G, H, R(40), 0xA2BFE8A1); P(H, A, B, C, D, E, F, G, R(41), 0xA81A664B); P(G, H, A, B, C, D, E, F, R(42), 0xC24B8B70); P(F, G, H, A, B, C, D, E, R(43), 0xC76C51A3); P(E, F, G, H, A, B, C, D, R(44), 0xD192E819); P(D, E, F, G, H, A, B, C, R(45), 0xD6990624); P(C, D, E, F, G, H, A, B, R(46), 0xF40E3585); P(B, C, D, E, F, G, H, A, R(47), 0x106AA070); P(A, B, C, D, E, F, G, H, R(48), 0x19A4C116); P(H, A, B, C, D, E, F, G, R(49), 0x1E376C08); P(G, H, A, B, C, D, E, F, R(50), 0x2748774C); P(F, G, H, A, B, C, D, E, R(51), 0x34B0BCB5); P(E, F, G, H, A, B, C, D, R(52), 0x391C0CB3); P(D, E, F, G, H, A, B, C, R(53), 0x4ED8AA4A); P(C, D, E, F, G, H, A, B, R(54), 0x5B9CCA4F); P(B, C, D, E, F, G, H, A, R(55), 0x682E6FF3); P(A, B, C, D, E, F, G, H, R(56), 0x748F82EE); P(H, A, B, C, D, E, F, G, R(57), 0x78A5636F); P(G, H, A, B, C, D, E, F, R(58), 0x84C87814); P(F, G, H, A, B, C, D, E, R(59), 0x8CC70208); P(E, F, G, H, A, B, C, D, R(60), 0x90BEFFFA); P(D, E, F, G, H, A, B, C, R(61), 0xA4506CEB); P(C, D, E, F, G, H, A, B, R(62), 0xBEF9A3F7); P(B, C, D, E, F, G, H, A, R(63), 0xC67178F2); ctx->state[0] += A; ctx->state[1] += B; ctx->state[2] += C; ctx->state[3] += D; ctx->state[4] += E; ctx->state[5] += F; ctx->state[6] += G; ctx->state[7] += H; } void sha256_update(context_sha256_T *ctx, char_u *input, UINT32_T length) { UINT32_T left, fill; if (length == 0) return; left = ctx->total[0] & 0x3F; fill = 64 - left; ctx->total[0] += length; ctx->total[0] &= 0xFFFFFFFF; if (ctx->total[0] < length) ctx->total[1]++; if (left && length >= fill) { memcpy((void *)(ctx->buffer + left), (void *)input, fill); sha256_process(ctx, ctx->buffer); length -= fill; input += fill; left = 0; } while (length >= 64) { sha256_process(ctx, input); length -= 64; input += 64; } if (length) memcpy((void *)(ctx->buffer + left), (void *)input, length); } static char_u sha256_padding[64] = { 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; void sha256_finish(context_sha256_T *ctx, char_u digest[32]) { UINT32_T last, padn; UINT32_T high, low; char_u msglen[8]; high = (ctx->total[0] >> 29) | (ctx->total[1] << 3); low = (ctx->total[0] << 3); PUT_UINT32(high, msglen, 0); PUT_UINT32(low, msglen, 4); last = ctx->total[0] & 0x3F; padn = (last < 56) ? (56 - last) : (120 - last); sha256_update(ctx, sha256_padding, padn); sha256_update(ctx, msglen, 8); PUT_UINT32(ctx->state[0], digest, 0); PUT_UINT32(ctx->state[1], digest, 4); PUT_UINT32(ctx->state[2], digest, 8); PUT_UINT32(ctx->state[3], digest, 12); PUT_UINT32(ctx->state[4], digest, 16); PUT_UINT32(ctx->state[5], digest, 20); PUT_UINT32(ctx->state[6], digest, 24); PUT_UINT32(ctx->state[7], digest, 28); } #endif /* FEAT_PERSISTENT_UNDO */