2 * InspIRCd -- Internet Relay Chat Daemon
4 * Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
5 * Copyright (C) 2007-2008 Robin Burchell <robin+git@viroteck.net>
6 * Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
7 * Copyright (C) 2006 Craig Edwards <craigedwards@brainbox.cc>
9 * This file is part of InspIRCd. InspIRCd is free software: you can
10 * redistribute it and/or modify it under the terms of the GNU General Public
11 * License as published by the Free Software Foundation, version 2.
13 * This program is distributed in the hope that it will be useful, but WITHOUT
14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
15 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
18 * You should have received a copy of the GNU General Public License
19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
23 /* m_sha256 - Based on m_opersha256 written by Special <john@yarbbles.com>
24 * Modified and improved by Craig Edwards, December 2006.
27 * FIPS 180-2 SHA-224/256/384/512 implementation
28 * Last update: 05/23/2005
29 * Issue date: 04/30/2005
31 * Copyright (C) 2005 Olivier Gay <olivier.gay@a3.epfl.ch>
32 * All rights reserved.
34 * Redistribution and use in source and binary forms, with or without
35 * modification, are permitted provided that the following conditions
37 * 1. Redistributions of source code must retain the above copyright
38 * notice, this list of conditions and the following disclaimer.
39 * 2. Redistributions in binary form must reproduce the above copyright
40 * notice, this list of conditions and the following disclaimer in the
41 * documentation and/or other materials provided with the distribution.
42 * 3. Neither the name of the project nor the names of its contributors
43 * may be used to endorse or promote products derived from this software
44 * without specific prior written permission.
46 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
47 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
48 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
49 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
50 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
51 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
52 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
53 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
54 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
55 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 #include "modules/hash.h"
62 #define SHA256_DIGEST_SIZE (256 / 8)
63 #define SHA256_BLOCK_SIZE (512 / 8)
65 /** An sha 256 context, used by m_opersha256
72 unsigned char block[2 * SHA256_BLOCK_SIZE];
76 #define SHFR(x, n) (x >> n)
77 #define ROTR(x, n) ((x >> n) | (x << ((sizeof(x) << 3) - n)))
78 #define ROTL(x, n) ((x << n) | (x >> ((sizeof(x) << 3) - n)))
79 #define CH(x, y, z) ((x & y) ^ (~x & z))
80 #define MAJ(x, y, z) ((x & y) ^ (x & z) ^ (y & z))
82 #define SHA256_F1(x) (ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22))
83 #define SHA256_F2(x) (ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25))
84 #define SHA256_F3(x) (ROTR(x, 7) ^ ROTR(x, 18) ^ SHFR(x, 3))
85 #define SHA256_F4(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ SHFR(x, 10))
87 #define UNPACK32(x, str) \
89 *((str) + 3) = (uint8_t) ((x) ); \
90 *((str) + 2) = (uint8_t) ((x) >> 8); \
91 *((str) + 1) = (uint8_t) ((x) >> 16); \
92 *((str) + 0) = (uint8_t) ((x) >> 24); \
95 #define PACK32(str, x) \
97 *(x) = ((uint32_t) *((str) + 3) ) \
98 | ((uint32_t) *((str) + 2) << 8) \
99 | ((uint32_t) *((str) + 1) << 16) \
100 | ((uint32_t) *((str) + 0) << 24); \
103 /* Macros used for loops unrolling */
105 #define SHA256_SCR(i) \
107 w[i] = SHA256_F4(w[i - 2]) + w[i - 7] \
108 + SHA256_F3(w[i - 15]) + w[i - 16]; \
111 const unsigned int sha256_h0[8] =
113 0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
114 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19
117 uint32_t sha256_k[64] =
119 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
120 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
121 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
122 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
123 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
124 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
125 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
126 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
127 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
128 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
129 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
130 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
131 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
132 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
133 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
134 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
137 class HashSHA256 : public HashProvider
139 void SHA256Init(SHA256Context *ctx, const unsigned int* ikey)
143 for (int i = 0; i < 8; i++)
148 for (int i = 0; i < 8; i++)
149 ctx->h[i] = sha256_h0[i];
155 void SHA256Transform(SHA256Context *ctx, unsigned char *message, unsigned int block_nb)
159 unsigned char *sub_block;
160 for (unsigned int i = 1; i <= block_nb; i++)
163 sub_block = message + ((i - 1) << 6);
165 for (j = 0; j < 16; j++)
166 PACK32(&sub_block[j << 2], &w[j]);
167 for (j = 16; j < 64; j++)
169 for (j = 0; j < 8; j++)
171 for (j = 0; j < 64; j++)
173 uint32_t t1 = wv[7] + SHA256_F2(wv[4]) + CH(wv[4], wv[5], wv[6]) + sha256_k[j] + w[j];
174 uint32_t t2 = SHA256_F1(wv[0]) + MAJ(wv[0], wv[1], wv[2]);
184 for (j = 0; j < 8; j++)
189 void SHA256Update(SHA256Context *ctx, unsigned char *message, unsigned int len)
192 * XXX here be dragons!
193 * After many hours of pouring over this, I think I've found the problem.
194 * When Special created our module from the reference one, he used:
196 * unsigned int rem_len = SHA256_BLOCK_SIZE - ctx->len;
198 * instead of the reference's version of:
200 * unsigned int tmp_len = SHA256_BLOCK_SIZE - ctx->len;
201 * unsigned int rem_len = len < tmp_len ? len : tmp_len;
203 * I've changed back to the reference version of this code, and it seems to work with no errors.
204 * So I'm inclined to believe this was the problem..
205 * -- w00t (January 06, 2008)
207 unsigned int tmp_len = SHA256_BLOCK_SIZE - ctx->len;
208 unsigned int rem_len = len < tmp_len ? len : tmp_len;
211 memcpy(&ctx->block[ctx->len], message, rem_len);
212 if (ctx->len + len < SHA256_BLOCK_SIZE)
217 unsigned int new_len = len - rem_len;
218 unsigned int block_nb = new_len / SHA256_BLOCK_SIZE;
219 unsigned char *shifted_message = message + rem_len;
220 SHA256Transform(ctx, ctx->block, 1);
221 SHA256Transform(ctx, shifted_message, block_nb);
222 rem_len = new_len % SHA256_BLOCK_SIZE;
223 memcpy(ctx->block, &shifted_message[block_nb << 6],rem_len);
225 ctx->tot_len += (block_nb + 1) << 6;
228 void SHA256Final(SHA256Context *ctx, unsigned char *digest)
230 unsigned int block_nb = (1 + ((SHA256_BLOCK_SIZE - 9) < (ctx->len % SHA256_BLOCK_SIZE)));
231 unsigned int len_b = (ctx->tot_len + ctx->len) << 3;
232 unsigned int pm_len = block_nb << 6;
233 memset(ctx->block + ctx->len, 0, pm_len - ctx->len);
234 ctx->block[ctx->len] = 0x80;
235 UNPACK32(len_b, ctx->block + pm_len - 4);
236 SHA256Transform(ctx, ctx->block, block_nb);
237 for (int i = 0 ; i < 8; i++)
238 UNPACK32(ctx->h[i], &digest[i << 2]);
241 void SHA256(const char *src, unsigned char *dest, unsigned int len)
244 SHA256Init(&ctx, NULL);
245 SHA256Update(&ctx, (unsigned char *)src, len);
246 SHA256Final(&ctx, dest);
250 std::string GenerateRaw(const std::string& data)
252 unsigned char bytes[SHA256_DIGEST_SIZE];
253 SHA256(data.data(), bytes, data.length());
254 return std::string((char*)bytes, SHA256_DIGEST_SIZE);
257 HashSHA256(Module* parent) : HashProvider(parent, "sha256", 32, 64) {}
260 class ModuleSHA256 : public Module
264 ModuleSHA256() : sha(this)
268 Version GetVersion() CXX11_OVERRIDE
270 return Version("Implements SHA-256 hashing", VF_VENDOR);
274 MODULE_INIT(ModuleSHA256)