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
63 #include "modules/hash.h"
66 typedef unsigned int uint32_t;
69 #define SHA256_DIGEST_SIZE (256 / 8)
70 #define SHA256_BLOCK_SIZE (512 / 8)
72 /** An sha 256 context, used by m_opersha256
79 unsigned char block[2 * SHA256_BLOCK_SIZE];
83 #define SHFR(x, n) (x >> n)
84 #define ROTR(x, n) ((x >> n) | (x << ((sizeof(x) << 3) - n)))
85 #define ROTL(x, n) ((x << n) | (x >> ((sizeof(x) << 3) - n)))
86 #define CH(x, y, z) ((x & y) ^ (~x & z))
87 #define MAJ(x, y, z) ((x & y) ^ (x & z) ^ (y & z))
89 #define SHA256_F1(x) (ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22))
90 #define SHA256_F2(x) (ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25))
91 #define SHA256_F3(x) (ROTR(x, 7) ^ ROTR(x, 18) ^ SHFR(x, 3))
92 #define SHA256_F4(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ SHFR(x, 10))
94 #define UNPACK32(x, str) \
96 *((str) + 3) = (uint8_t) ((x) ); \
97 *((str) + 2) = (uint8_t) ((x) >> 8); \
98 *((str) + 1) = (uint8_t) ((x) >> 16); \
99 *((str) + 0) = (uint8_t) ((x) >> 24); \
102 #define PACK32(str, x) \
104 *(x) = ((uint32_t) *((str) + 3) ) \
105 | ((uint32_t) *((str) + 2) << 8) \
106 | ((uint32_t) *((str) + 1) << 16) \
107 | ((uint32_t) *((str) + 0) << 24); \
110 /* Macros used for loops unrolling */
112 #define SHA256_SCR(i) \
114 w[i] = SHA256_F4(w[i - 2]) + w[i - 7] \
115 + SHA256_F3(w[i - 15]) + w[i - 16]; \
118 const unsigned int sha256_h0[8] =
120 0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
121 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19
124 uint32_t sha256_k[64] =
126 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
127 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
128 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
129 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
130 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
131 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
132 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
133 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
134 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
135 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
136 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
137 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
138 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
139 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
140 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
141 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
144 class HashSHA256 : public HashProvider
146 void SHA256Init(SHA256Context *ctx, const unsigned int* ikey)
150 for (int i = 0; i < 8; i++)
155 for (int i = 0; i < 8; i++)
156 ctx->h[i] = sha256_h0[i];
162 void SHA256Transform(SHA256Context *ctx, unsigned char *message, unsigned int block_nb)
166 unsigned char *sub_block;
167 for (unsigned int i = 1; i <= block_nb; i++)
170 sub_block = message + ((i - 1) << 6);
172 for (j = 0; j < 16; j++)
173 PACK32(&sub_block[j << 2], &w[j]);
174 for (j = 16; j < 64; j++)
176 for (j = 0; j < 8; j++)
178 for (j = 0; j < 64; j++)
180 uint32_t t1 = wv[7] + SHA256_F2(wv[4]) + CH(wv[4], wv[5], wv[6]) + sha256_k[j] + w[j];
181 uint32_t t2 = SHA256_F1(wv[0]) + MAJ(wv[0], wv[1], wv[2]);
191 for (j = 0; j < 8; j++)
196 void SHA256Update(SHA256Context *ctx, unsigned char *message, unsigned int len)
199 * XXX here be dragons!
200 * After many hours of pouring over this, I think I've found the problem.
201 * When Special created our module from the reference one, he used:
203 * unsigned int rem_len = SHA256_BLOCK_SIZE - ctx->len;
205 * instead of the reference's version of:
207 * unsigned int tmp_len = SHA256_BLOCK_SIZE - ctx->len;
208 * unsigned int rem_len = len < tmp_len ? len : tmp_len;
210 * I've changed back to the reference version of this code, and it seems to work with no errors.
211 * So I'm inclined to believe this was the problem..
212 * -- w00t (January 06, 2008)
214 unsigned int tmp_len = SHA256_BLOCK_SIZE - ctx->len;
215 unsigned int rem_len = len < tmp_len ? len : tmp_len;
218 memcpy(&ctx->block[ctx->len], message, rem_len);
219 if (ctx->len + len < SHA256_BLOCK_SIZE)
224 unsigned int new_len = len - rem_len;
225 unsigned int block_nb = new_len / SHA256_BLOCK_SIZE;
226 unsigned char *shifted_message = message + rem_len;
227 SHA256Transform(ctx, ctx->block, 1);
228 SHA256Transform(ctx, shifted_message, block_nb);
229 rem_len = new_len % SHA256_BLOCK_SIZE;
230 memcpy(ctx->block, &shifted_message[block_nb << 6],rem_len);
232 ctx->tot_len += (block_nb + 1) << 6;
235 void SHA256Final(SHA256Context *ctx, unsigned char *digest)
237 unsigned int block_nb = (1 + ((SHA256_BLOCK_SIZE - 9) < (ctx->len % SHA256_BLOCK_SIZE)));
238 unsigned int len_b = (ctx->tot_len + ctx->len) << 3;
239 unsigned int pm_len = block_nb << 6;
240 memset(ctx->block + ctx->len, 0, pm_len - ctx->len);
241 ctx->block[ctx->len] = 0x80;
242 UNPACK32(len_b, ctx->block + pm_len - 4);
243 SHA256Transform(ctx, ctx->block, block_nb);
244 for (int i = 0 ; i < 8; i++)
245 UNPACK32(ctx->h[i], &digest[i << 2]);
248 void SHA256(const char *src, unsigned char *dest, unsigned int len)
251 SHA256Init(&ctx, NULL);
252 SHA256Update(&ctx, (unsigned char *)src, len);
253 SHA256Final(&ctx, dest);
257 std::string sum(const std::string& data)
259 unsigned char bytes[SHA256_DIGEST_SIZE];
260 SHA256(data.data(), bytes, data.length());
261 return std::string((char*)bytes, SHA256_DIGEST_SIZE);
264 HashSHA256(Module* parent) : HashProvider(parent, "hash/sha256", 32, 64) {}
267 class ModuleSHA256 : public Module
271 ModuleSHA256() : sha(this)
273 ServerInstance->Modules->AddService(sha);
276 Version GetVersion() CXX11_OVERRIDE
278 return Version("Implements SHA-256 hashing", VF_VENDOR);
282 MODULE_INIT(ModuleSHA256)