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Diffstat (limited to 'src/utils/sha256.cpp')
| -rw-r--r-- | src/utils/sha256.cpp | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/src/utils/sha256.cpp b/src/utils/sha256.cpp new file mode 100644 index 00000000..82d1fc5c --- /dev/null +++ b/src/utils/sha256.cpp @@ -0,0 +1,275 @@ +/* + * The Mana World + * Copyright 2008 The Mana World Development Team + * + * This file has been slighly modified as part of The Mana World. + * + * The Mana World is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * any later version. + * + * The Mana World is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with The Mana World; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +/* +------------------------------------+ + * | Inspire Internet Relay Chat Daemon | + * +------------------------------------+ + * + * InspIRCd: (C) 2002-2008 InspIRCd Development Team + * See: http://www.inspircd.org/wiki/index.php/Credits + * + * This program is free but copyrighted software; see + * the file COPYING for details. + * + * --------------------------------------------------- + */ + +/* m_sha256 - Based on m_opersha256 written by Special <john@yarbbles.com> + * Modified and improved by Craig Edwards, December 2006. + * + * + * FIPS 180-2 SHA-224/256/384/512 implementation + * Last update: 05/23/2005 + * Issue date: 04/30/2005 + * + * Copyright (C) 2005 Olivier Gay <olivier.gay@a3.epfl.ch> + * 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 "sha256.h" +#include <memory.h> + +#ifdef HAS_STDINT +#include <stdint.h> +#endif +#ifndef HAS_STDINT +typedef unsigned int uint32_t; +#endif + +#define SHA256_BLOCK_SIZE (512 / 8) + +/** An sha 256 context, used by original m_opersha256 */ +class SHA256Context +{ + public: + unsigned int tot_len; + unsigned int len; + unsigned char block[2 * SHA256_BLOCK_SIZE]; + uint32_t h[8]; +}; + +#define SHA256_DIGEST_SIZE (256 / 8) + +#define SHFR(x, n) (x >> n) +#define ROTR(x, n) ((x >> n) | (x << ((sizeof(x) << 3) - n))) +#define ROTL(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_t) ((x) ); \ + *((str) + 2) = (uint8_t) ((x) >> 8); \ + *((str) + 1) = (uint8_t) ((x) >> 16); \ + *((str) + 0) = (uint8_t) ((x) >> 24); \ +} + +#define PACK32(str, x) \ +{ \ + *(x) = ((uint32_t) *((str) + 3) ) \ + | ((uint32_t) *((str) + 2) << 8) \ + | ((uint32_t) *((str) + 1) << 16) \ + | ((uint32_t) *((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]; \ +} + +const unsigned int sha256_h0[8] = +{ + 0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, + 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19 +}; + +uint32_t 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 +}; + +void SHA256Init(SHA256Context *ctx) +{ + for (int i = 0; i < 8; i++) + ctx->h[i] = sha256_h0[i]; + ctx->len = 0; + ctx->tot_len = 0; +} + +void SHA256Transform(SHA256Context *ctx, + unsigned char *message, + unsigned int block_nb) +{ + uint32_t w[64]; + uint32_t wv[8]; + unsigned char *sub_block; + for (unsigned int i = 1; i <= block_nb; i++) + { + int j; + sub_block = message + ((i - 1) << 6); + + for (j = 0; j < 16; j++) + PACK32(&sub_block[j << 2], &w[j]); + for (j = 16; j < 64; j++) + SHA256_SCR(j); + for (j = 0; j < 8; j++) + wv[j] = ctx->h[j]; + for (j = 0; j < 64; j++) + { + uint32_t t1 = wv[7] + SHA256_F2(wv[4]) + CH(wv[4], wv[5], wv[6]) + sha256_k[j] + w[j]; + uint32_t t2 = SHA256_F1(wv[0]) + MAJ(wv[0], wv[1], wv[2]); + wv[7] = wv[6]; + wv[6] = wv[5]; + wv[5] = wv[4]; + wv[4] = wv[3] + t1; + wv[3] = wv[2]; + wv[2] = wv[1]; + wv[1] = wv[0]; + wv[0] = t1 + t2; + } + for (j = 0; j < 8; j++) + ctx->h[j] += wv[j]; + } +} + +void SHA256Update(SHA256Context *ctx, + unsigned char *message, + unsigned int len) +{ + /* + * XXX here be dragons! + * After many hours of pouring over this, I think I've found the problem. + * When Special created our module from the reference one, he used: + * + * unsigned int rem_len = SHA256_BLOCK_SIZE - ctx->len; + * + * instead of the reference's version of: + * + * unsigned int tmp_len = SHA256_BLOCK_SIZE - ctx->len; + * unsigned int rem_len = len < tmp_len ? len : tmp_len; + * + * I've changed back to the reference version of this code, and it seems to work with no errors. + * So I'm inclined to believe this was the problem.. + * -- w00t (January 06, 2008) + */ + unsigned int tmp_len = SHA256_BLOCK_SIZE - ctx->len; + unsigned int 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; + } + unsigned int new_len = len - rem_len; + unsigned int block_nb = new_len / SHA256_BLOCK_SIZE; + unsigned char *shifted_message = message + rem_len; + SHA256Transform(ctx, ctx->block, 1); + SHA256Transform(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 SHA256Final(SHA256Context *ctx, unsigned char *digest) +{ + unsigned int block_nb = (1 + ((SHA256_BLOCK_SIZE - 9) < (ctx->len % SHA256_BLOCK_SIZE))); + unsigned int len_b = (ctx->tot_len + ctx->len) << 3; + unsigned int 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); + SHA256Transform(ctx, ctx->block, block_nb); + for (int i = 0 ; i < 8; i++) + UNPACK32(ctx->h[i], &digest[i << 2]); +} + +std::string SHA256Hash(const char *src, int len) +{ + // Generate the hash + unsigned char bytehash[SHA256_DIGEST_SIZE]; + SHA256Context ctx; + SHA256Init(&ctx); + SHA256Update(&ctx, (unsigned char *)src, (unsigned int)len); + SHA256Final(&ctx, bytehash); + // Convert it to hex + const char* hxc = "0123456789abcdef"; + std::string hash = ""; + for (int i = 0; i < SHA256_DIGEST_SIZE; i++) + { + hash += hxc[bytehash[i] / 16]; + hash += hxc[bytehash[i] % 16]; + } + return hash; +} + +std::string sha256(const std::string& string) +{ + return SHA256Hash(string.c_str(), string.length()); +} |