/* Copyright 2000, 2009, 2011, 2012 Neil Edelman, distributed under the terms of the GNU General Public License, see copying.txt */ /* AlexV hacked the game; thanks for the recomendations -- Jan 2011 I'm using Olivier Gay's SHA-256 implementation, slightly modified */ #include #include "Mac.h" #define SHA256_BLOCK_SIZE (512 / 8) void hmac_sha256(unsigned char *key, unsigned char *message, unsigned int message_len, unsigned char *mac, unsigned mac_size); char *Mac(const char *str) { static const char *mime = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"; static const char *key = #ifdef SECRET SECRET #else "5bdcc146bf60754e6a042426089575c75a003f089d2739839dec58b964ec3843" #endif ; int i; static char mac[SHA256_BLOCK_SIZE+1]; hmac_sha256((unsigned char *)key, (unsigned char *)str, strlen(str), (unsigned char *)mac, SHA256_BLOCK_SIZE); /* URI stringise the MAC (loss of 2-bits) */ for(i = 0; i < SHA256_BLOCK_SIZE; i++) mac[i] = mime[mac[i] & 63]; mac[i] = '\0'; return mac; } /*- * HMAC-SHA-224/256/384/512 implementation * Last update: 06/15/2005 * Issue date: 06/15/2005 * * Copyright (C) 2005 Olivier Gay * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the project nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #define SHA256_DIGEST_SIZE ( 256 / 8) #define SHFR(x, n) (x >> n) #define ROTR(x, n) ((x >> n) | (x << ((sizeof(x) << 3) - n))) #define CH(x, y, z) ((x & y) ^ (~x & z)) #define MAJ(x, y, z) ((x & y) ^ (x & z) ^ (y & z)) #define SHA256_F1(x) (ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22)) #define SHA256_F2(x) (ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25)) #define SHA256_F3(x) (ROTR(x, 7) ^ ROTR(x, 18) ^ SHFR(x, 3)) #define SHA256_F4(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ SHFR(x, 10)) #define UNPACK32(x, str) \ { \ *((str) + 3) = (uint8) ((x) ); \ *((str) + 2) = (uint8) ((x) >> 8); \ *((str) + 1) = (uint8) ((x) >> 16); \ *((str) + 0) = (uint8) ((x) >> 24); \ } #define PACK32(str, x) \ { \ *(x) = ((uint32) *((str) + 3) ) \ | ((uint32) *((str) + 2) << 8) \ | ((uint32) *((str) + 1) << 16) \ | ((uint32) *((str) + 0) << 24); \ } /* Macros used for loops unrolling */ #define SHA256_SCR(i) \ { \ w[i] = SHA256_F4(w[i - 2]) + w[i - 7] \ + SHA256_F3(w[i - 15]) + w[i - 16]; \ } #define SHA256_EXP(a, b, c, d, e, f, g, h, j) \ { \ t1 = wv[h] + SHA256_F2(wv[e]) + CH(wv[e], wv[f], wv[g]) \ + sha256_k[j] + w[j]; \ t2 = SHA256_F1(wv[a]) + MAJ(wv[a], wv[b], wv[c]); \ wv[d] += t1; \ wv[h] = t1 + t2; \ } typedef uint8_t uint8; typedef uint32_t uint32; typedef uint64_t uint64; const static uint32 sha256_h0[8] = { 0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19}; uint32 sha256_k[64] = { 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2}; /* sha2 */ typedef struct { unsigned int tot_len; unsigned int len; unsigned char block[2 * SHA256_BLOCK_SIZE]; uint32 h[8]; } sha256_ctx; void sha256_transf(sha256_ctx *ctx, const unsigned char *message, unsigned int block_nb) { uint32 w[64]; uint32 wv[8]; uint32 t1, t2; const unsigned char *sub_block; int i; for (i = 0; i < (int) block_nb; i++) { sub_block = message + (i << 6); PACK32(&sub_block[ 0], &w[ 0]); PACK32(&sub_block[ 4], &w[ 1]); PACK32(&sub_block[ 8], &w[ 2]); PACK32(&sub_block[12], &w[ 3]); PACK32(&sub_block[16], &w[ 4]); PACK32(&sub_block[20], &w[ 5]); PACK32(&sub_block[24], &w[ 6]); PACK32(&sub_block[28], &w[ 7]); PACK32(&sub_block[32], &w[ 8]); PACK32(&sub_block[36], &w[ 9]); PACK32(&sub_block[40], &w[10]); PACK32(&sub_block[44], &w[11]); PACK32(&sub_block[48], &w[12]); PACK32(&sub_block[52], &w[13]); PACK32(&sub_block[56], &w[14]); PACK32(&sub_block[60], &w[15]); SHA256_SCR(16); SHA256_SCR(17); SHA256_SCR(18); SHA256_SCR(19); SHA256_SCR(20); SHA256_SCR(21); SHA256_SCR(22); SHA256_SCR(23); SHA256_SCR(24); SHA256_SCR(25); SHA256_SCR(26); SHA256_SCR(27); SHA256_SCR(28); SHA256_SCR(29); SHA256_SCR(30); SHA256_SCR(31); SHA256_SCR(32); SHA256_SCR(33); SHA256_SCR(34); SHA256_SCR(35); SHA256_SCR(36); SHA256_SCR(37); SHA256_SCR(38); SHA256_SCR(39); SHA256_SCR(40); SHA256_SCR(41); SHA256_SCR(42); SHA256_SCR(43); SHA256_SCR(44); SHA256_SCR(45); SHA256_SCR(46); SHA256_SCR(47); SHA256_SCR(48); SHA256_SCR(49); SHA256_SCR(50); SHA256_SCR(51); SHA256_SCR(52); SHA256_SCR(53); SHA256_SCR(54); SHA256_SCR(55); SHA256_SCR(56); SHA256_SCR(57); SHA256_SCR(58); SHA256_SCR(59); SHA256_SCR(60); SHA256_SCR(61); SHA256_SCR(62); SHA256_SCR(63); wv[0] = ctx->h[0]; wv[1] = ctx->h[1]; wv[2] = ctx->h[2]; wv[3] = ctx->h[3]; wv[4] = ctx->h[4]; wv[5] = ctx->h[5]; wv[6] = ctx->h[6]; wv[7] = ctx->h[7]; SHA256_EXP(0,1,2,3,4,5,6,7, 0); SHA256_EXP(7,0,1,2,3,4,5,6, 1); SHA256_EXP(6,7,0,1,2,3,4,5, 2); SHA256_EXP(5,6,7,0,1,2,3,4, 3); SHA256_EXP(4,5,6,7,0,1,2,3, 4); SHA256_EXP(3,4,5,6,7,0,1,2, 5); SHA256_EXP(2,3,4,5,6,7,0,1, 6); SHA256_EXP(1,2,3,4,5,6,7,0, 7); SHA256_EXP(0,1,2,3,4,5,6,7, 8); SHA256_EXP(7,0,1,2,3,4,5,6, 9); SHA256_EXP(6,7,0,1,2,3,4,5,10); SHA256_EXP(5,6,7,0,1,2,3,4,11); SHA256_EXP(4,5,6,7,0,1,2,3,12); SHA256_EXP(3,4,5,6,7,0,1,2,13); SHA256_EXP(2,3,4,5,6,7,0,1,14); SHA256_EXP(1,2,3,4,5,6,7,0,15); SHA256_EXP(0,1,2,3,4,5,6,7,16); SHA256_EXP(7,0,1,2,3,4,5,6,17); SHA256_EXP(6,7,0,1,2,3,4,5,18); SHA256_EXP(5,6,7,0,1,2,3,4,19); SHA256_EXP(4,5,6,7,0,1,2,3,20); SHA256_EXP(3,4,5,6,7,0,1,2,21); SHA256_EXP(2,3,4,5,6,7,0,1,22); SHA256_EXP(1,2,3,4,5,6,7,0,23); SHA256_EXP(0,1,2,3,4,5,6,7,24); SHA256_EXP(7,0,1,2,3,4,5,6,25); SHA256_EXP(6,7,0,1,2,3,4,5,26); SHA256_EXP(5,6,7,0,1,2,3,4,27); SHA256_EXP(4,5,6,7,0,1,2,3,28); SHA256_EXP(3,4,5,6,7,0,1,2,29); SHA256_EXP(2,3,4,5,6,7,0,1,30); SHA256_EXP(1,2,3,4,5,6,7,0,31); SHA256_EXP(0,1,2,3,4,5,6,7,32); SHA256_EXP(7,0,1,2,3,4,5,6,33); SHA256_EXP(6,7,0,1,2,3,4,5,34); SHA256_EXP(5,6,7,0,1,2,3,4,35); SHA256_EXP(4,5,6,7,0,1,2,3,36); SHA256_EXP(3,4,5,6,7,0,1,2,37); SHA256_EXP(2,3,4,5,6,7,0,1,38); SHA256_EXP(1,2,3,4,5,6,7,0,39); SHA256_EXP(0,1,2,3,4,5,6,7,40); SHA256_EXP(7,0,1,2,3,4,5,6,41); SHA256_EXP(6,7,0,1,2,3,4,5,42); SHA256_EXP(5,6,7,0,1,2,3,4,43); SHA256_EXP(4,5,6,7,0,1,2,3,44); SHA256_EXP(3,4,5,6,7,0,1,2,45); SHA256_EXP(2,3,4,5,6,7,0,1,46); SHA256_EXP(1,2,3,4,5,6,7,0,47); SHA256_EXP(0,1,2,3,4,5,6,7,48); SHA256_EXP(7,0,1,2,3,4,5,6,49); SHA256_EXP(6,7,0,1,2,3,4,5,50); SHA256_EXP(5,6,7,0,1,2,3,4,51); SHA256_EXP(4,5,6,7,0,1,2,3,52); SHA256_EXP(3,4,5,6,7,0,1,2,53); SHA256_EXP(2,3,4,5,6,7,0,1,54); SHA256_EXP(1,2,3,4,5,6,7,0,55); SHA256_EXP(0,1,2,3,4,5,6,7,56); SHA256_EXP(7,0,1,2,3,4,5,6,57); SHA256_EXP(6,7,0,1,2,3,4,5,58); SHA256_EXP(5,6,7,0,1,2,3,4,59); SHA256_EXP(4,5,6,7,0,1,2,3,60); SHA256_EXP(3,4,5,6,7,0,1,2,61); SHA256_EXP(2,3,4,5,6,7,0,1,62); SHA256_EXP(1,2,3,4,5,6,7,0,63); ctx->h[0] += wv[0]; ctx->h[1] += wv[1]; ctx->h[2] += wv[2]; ctx->h[3] += wv[3]; ctx->h[4] += wv[4]; ctx->h[5] += wv[5]; ctx->h[6] += wv[6]; ctx->h[7] += wv[7]; } } void sha256_init(sha256_ctx *ctx) { ctx->h[0] = sha256_h0[0]; ctx->h[1] = sha256_h0[1]; ctx->h[2] = sha256_h0[2]; ctx->h[3] = sha256_h0[3]; ctx->h[4] = sha256_h0[4]; ctx->h[5] = sha256_h0[5]; ctx->h[6] = sha256_h0[6]; ctx->h[7] = sha256_h0[7]; ctx->len = 0; ctx->tot_len = 0; } void sha256_update(sha256_ctx *ctx, const unsigned char *message, unsigned int len) { unsigned int block_nb; unsigned int new_len, rem_len, tmp_len; const unsigned char *shifted_message; tmp_len = SHA256_BLOCK_SIZE - ctx->len; rem_len = len < tmp_len ? len : tmp_len; memcpy(&ctx->block[ctx->len], message, rem_len); if (ctx->len + len < SHA256_BLOCK_SIZE) { ctx->len += len; return; } new_len = len - rem_len; block_nb = new_len / SHA256_BLOCK_SIZE; shifted_message = message + rem_len; sha256_transf(ctx, ctx->block, 1); sha256_transf(ctx, shifted_message, block_nb); rem_len = new_len % SHA256_BLOCK_SIZE; memcpy(ctx->block, &shifted_message[block_nb << 6], rem_len); ctx->len = rem_len; ctx->tot_len += (block_nb + 1) << 6; } void sha256_final(sha256_ctx *ctx, unsigned char *digest) { unsigned int block_nb; unsigned int pm_len; unsigned int len_b; block_nb = (1 + ((SHA256_BLOCK_SIZE - 9) < (ctx->len % SHA256_BLOCK_SIZE))); len_b = (ctx->tot_len + ctx->len) << 3; pm_len = block_nb << 6; memset(ctx->block + ctx->len, 0, pm_len - ctx->len); ctx->block[ctx->len] = 0x80; UNPACK32(len_b, ctx->block + pm_len - 4); sha256_transf(ctx, ctx->block, block_nb); UNPACK32(ctx->h[0], &digest[ 0]); UNPACK32(ctx->h[1], &digest[ 4]); UNPACK32(ctx->h[2], &digest[ 8]); UNPACK32(ctx->h[3], &digest[12]); UNPACK32(ctx->h[4], &digest[16]); UNPACK32(ctx->h[5], &digest[20]); UNPACK32(ctx->h[6], &digest[24]); UNPACK32(ctx->h[7], &digest[28]); } void sha256(const unsigned char *message, unsigned int len, unsigned char *digest) { sha256_ctx ctx; sha256_init(&ctx); sha256_update(&ctx, message, len); sha256_final(&ctx, digest); } /* hmac-sha2 */ typedef struct { sha256_ctx ctx_inside; sha256_ctx ctx_outside; /* for hmac_reinit */ sha256_ctx ctx_inside_reinit; sha256_ctx ctx_outside_reinit; unsigned char block_ipad[SHA256_BLOCK_SIZE]; unsigned char block_opad[SHA256_BLOCK_SIZE]; } hmac_sha256_ctx; void hmac_sha256_init(hmac_sha256_ctx *ctx, unsigned char *key) { unsigned int num; unsigned char *key_used; int i; key_used = key; num = SHA256_BLOCK_SIZE; for (i = 0; i < num; i++) { ctx->block_ipad[i] = key_used[i] ^ 0x36; ctx->block_opad[i] = key_used[i] ^ 0x5c; } sha256_init(&ctx->ctx_inside); sha256_update(&ctx->ctx_inside, ctx->block_ipad, SHA256_BLOCK_SIZE); sha256_init(&ctx->ctx_outside); sha256_update(&ctx->ctx_outside, ctx->block_opad, SHA256_BLOCK_SIZE); /* for hmac_reinit */ memcpy(&ctx->ctx_inside_reinit, &ctx->ctx_inside, sizeof(sha256_ctx)); memcpy(&ctx->ctx_outside_reinit, &ctx->ctx_outside, sizeof(sha256_ctx)); } void hmac_sha256_reinit(hmac_sha256_ctx *ctx) { memcpy(&ctx->ctx_inside, &ctx->ctx_inside_reinit, sizeof(sha256_ctx)); memcpy(&ctx->ctx_outside, &ctx->ctx_outside_reinit, sizeof(sha256_ctx)); } void hmac_sha256_update(hmac_sha256_ctx *ctx, unsigned char *message, unsigned int message_len) { sha256_update(&ctx->ctx_inside, message, message_len); } void hmac_sha256_final(hmac_sha256_ctx *ctx, unsigned char *mac, unsigned int mac_size) { unsigned char digest_inside[SHA256_DIGEST_SIZE]; unsigned char mac_temp[SHA256_DIGEST_SIZE]; sha256_final(&ctx->ctx_inside, digest_inside); sha256_update(&ctx->ctx_outside, digest_inside, SHA256_DIGEST_SIZE); sha256_final(&ctx->ctx_outside, mac_temp); memcpy(mac, mac_temp, mac_size); } void hmac_sha256(unsigned char *key, unsigned char *message, unsigned int message_len, unsigned char *mac, unsigned mac_size) { hmac_sha256_ctx ctx; hmac_sha256_init(&ctx, key); hmac_sha256_update(&ctx, message, message_len); hmac_sha256_final(&ctx, mac, mac_size); }