Sync libmd with FreeBSD:
[dragonfly.git] / lib / libmd / sha256c.c
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1/*-
2 * Copyright 2005 Colin Percival
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
3cd01911
SW
26 * $FreeBSD: src/lib/libmd/sha256c.c,v 1.2 2006/01/17 15:35:56 phk Exp $
27 * $DragonFly: src/lib/libmd/sha256c.c,v 1.2 2008/09/11 20:25:34 swildner Exp $
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28 */
29
30#include <sys/cdefs.h>
31#include <sys/endian.h>
32#include <sys/types.h>
33
34#include <string.h>
35
36#include "sha256.h"
37
38#if BYTE_ORDER == BIG_ENDIAN
39
40/* Copy a vector of big-endian uint32_t into a vector of bytes */
41#define be32enc_vect(dst, src, len) \
42 memcpy((void *)dst, (const void *)src, (size_t)len)
43
44/* Copy a vector of bytes into a vector of big-endian uint32_t */
45#define be32dec_vect(dst, src, len) \
46 memcpy((void *)dst, (const void *)src, (size_t)len)
47
48#else /* BYTE_ORDER != BIG_ENDIAN */
49
50/*
51 * Encode a length len/4 vector of (uint32_t) into a length len vector of
52 * (unsigned char) in big-endian form. Assumes len is a multiple of 4.
53 */
54static void
55be32enc_vect(unsigned char *dst, const uint32_t *src, size_t len)
56{
57 size_t i;
58
59 for (i = 0; i < len / 4; i++)
60 be32enc(dst + i * 4, src[i]);
61}
62
63/*
64 * Decode a big-endian length len vector of (unsigned char) into a length
65 * len/4 vector of (uint32_t). Assumes len is a multiple of 4.
66 */
67static void
68be32dec_vect(uint32_t *dst, const unsigned char *src, size_t len)
69{
70 size_t i;
71
72 for (i = 0; i < len / 4; i++)
73 dst[i] = be32dec(src + i * 4);
74}
75
76#endif /* BYTE_ORDER != BIG_ENDIAN */
77
78/* Elementary functions used by SHA256 */
79#define Ch(x, y, z) ((x & (y ^ z)) ^ z)
80#define Maj(x, y, z) ((x & (y | z)) | (y & z))
81#define SHR(x, n) (x >> n)
82#define ROTR(x, n) ((x >> n) | (x << (32 - n)))
83#define S0(x) (ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22))
84#define S1(x) (ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25))
85#define s0(x) (ROTR(x, 7) ^ ROTR(x, 18) ^ SHR(x, 3))
86#define s1(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ SHR(x, 10))
87
88/* SHA256 round function */
89#define RND(a, b, c, d, e, f, g, h, k) \
90 t0 = h + S1(e) + Ch(e, f, g) + k; \
91 t1 = S0(a) + Maj(a, b, c); \
92 d += t0; \
93 h = t0 + t1;
94
95/* Adjusted round function for rotating state */
96#define RNDr(S, W, i, k) \
97 RND(S[(64 - i) % 8], S[(65 - i) % 8], \
98 S[(66 - i) % 8], S[(67 - i) % 8], \
99 S[(68 - i) % 8], S[(69 - i) % 8], \
100 S[(70 - i) % 8], S[(71 - i) % 8], \
101 W[i] + k)
102
103/*
104 * SHA256 block compression function. The 256-bit state is transformed via
105 * the 512-bit input block to produce a new state.
106 */
107static void
108SHA256_Transform(uint32_t * state, const unsigned char block[64])
109{
110 uint32_t W[64];
111 uint32_t S[8];
112 uint32_t t0, t1;
113 int i;
114
115 /* 1. Prepare message schedule W. */
116 be32dec_vect(W, block, 64);
117 for (i = 16; i < 64; i++)
118 W[i] = s1(W[i - 2]) + W[i - 7] + s0(W[i - 15]) + W[i - 16];
119
120 /* 2. Initialize working variables. */
121 memcpy(S, state, 32);
122
123 /* 3. Mix. */
124 RNDr(S, W, 0, 0x428a2f98);
125 RNDr(S, W, 1, 0x71374491);
126 RNDr(S, W, 2, 0xb5c0fbcf);
127 RNDr(S, W, 3, 0xe9b5dba5);
128 RNDr(S, W, 4, 0x3956c25b);
129 RNDr(S, W, 5, 0x59f111f1);
130 RNDr(S, W, 6, 0x923f82a4);
131 RNDr(S, W, 7, 0xab1c5ed5);
132 RNDr(S, W, 8, 0xd807aa98);
133 RNDr(S, W, 9, 0x12835b01);
134 RNDr(S, W, 10, 0x243185be);
135 RNDr(S, W, 11, 0x550c7dc3);
136 RNDr(S, W, 12, 0x72be5d74);
137 RNDr(S, W, 13, 0x80deb1fe);
138 RNDr(S, W, 14, 0x9bdc06a7);
139 RNDr(S, W, 15, 0xc19bf174);
140 RNDr(S, W, 16, 0xe49b69c1);
141 RNDr(S, W, 17, 0xefbe4786);
142 RNDr(S, W, 18, 0x0fc19dc6);
143 RNDr(S, W, 19, 0x240ca1cc);
144 RNDr(S, W, 20, 0x2de92c6f);
145 RNDr(S, W, 21, 0x4a7484aa);
146 RNDr(S, W, 22, 0x5cb0a9dc);
147 RNDr(S, W, 23, 0x76f988da);
148 RNDr(S, W, 24, 0x983e5152);
149 RNDr(S, W, 25, 0xa831c66d);
150 RNDr(S, W, 26, 0xb00327c8);
151 RNDr(S, W, 27, 0xbf597fc7);
152 RNDr(S, W, 28, 0xc6e00bf3);
153 RNDr(S, W, 29, 0xd5a79147);
154 RNDr(S, W, 30, 0x06ca6351);
155 RNDr(S, W, 31, 0x14292967);
156 RNDr(S, W, 32, 0x27b70a85);
157 RNDr(S, W, 33, 0x2e1b2138);
158 RNDr(S, W, 34, 0x4d2c6dfc);
159 RNDr(S, W, 35, 0x53380d13);
160 RNDr(S, W, 36, 0x650a7354);
161 RNDr(S, W, 37, 0x766a0abb);
162 RNDr(S, W, 38, 0x81c2c92e);
163 RNDr(S, W, 39, 0x92722c85);
164 RNDr(S, W, 40, 0xa2bfe8a1);
165 RNDr(S, W, 41, 0xa81a664b);
166 RNDr(S, W, 42, 0xc24b8b70);
167 RNDr(S, W, 43, 0xc76c51a3);
168 RNDr(S, W, 44, 0xd192e819);
169 RNDr(S, W, 45, 0xd6990624);
170 RNDr(S, W, 46, 0xf40e3585);
171 RNDr(S, W, 47, 0x106aa070);
172 RNDr(S, W, 48, 0x19a4c116);
173 RNDr(S, W, 49, 0x1e376c08);
174 RNDr(S, W, 50, 0x2748774c);
175 RNDr(S, W, 51, 0x34b0bcb5);
176 RNDr(S, W, 52, 0x391c0cb3);
177 RNDr(S, W, 53, 0x4ed8aa4a);
178 RNDr(S, W, 54, 0x5b9cca4f);
179 RNDr(S, W, 55, 0x682e6ff3);
180 RNDr(S, W, 56, 0x748f82ee);
181 RNDr(S, W, 57, 0x78a5636f);
182 RNDr(S, W, 58, 0x84c87814);
183 RNDr(S, W, 59, 0x8cc70208);
184 RNDr(S, W, 60, 0x90befffa);
185 RNDr(S, W, 61, 0xa4506ceb);
186 RNDr(S, W, 62, 0xbef9a3f7);
187 RNDr(S, W, 63, 0xc67178f2);
188
189 /* 4. Mix local working variables into global state */
190 for (i = 0; i < 8; i++)
191 state[i] += S[i];
192}
193
194static unsigned char PAD[64] = {
195 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
196 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
197 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
198 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
199};
200
201/* Add padding and terminating bit-count. */
202static void
203SHA256_Pad(SHA256_CTX * ctx)
204{
205 unsigned char len[8];
206 uint32_t r, plen;
207
208 /*
209 * Convert length to a vector of bytes -- we do this now rather
210 * than later because the length will change after we pad.
211 */
212 be32enc_vect(len, ctx->count, 8);
213
214 /* Add 1--64 bytes so that the resulting length is 56 mod 64 */
215 r = (ctx->count[1] >> 3) & 0x3f;
216 plen = (r < 56) ? (56 - r) : (120 - r);
217 SHA256_Update(ctx, PAD, (size_t)plen);
218
219 /* Add the terminating bit-count */
220 SHA256_Update(ctx, len, 8);
221}
222
223/* SHA-256 initialization. Begins a SHA-256 operation. */
224void
225SHA256_Init(SHA256_CTX * ctx)
226{
227
228 /* Zero bits processed so far */
229 ctx->count[0] = ctx->count[1] = 0;
230
231 /* Magic initialization constants */
232 ctx->state[0] = 0x6A09E667;
233 ctx->state[1] = 0xBB67AE85;
234 ctx->state[2] = 0x3C6EF372;
235 ctx->state[3] = 0xA54FF53A;
236 ctx->state[4] = 0x510E527F;
237 ctx->state[5] = 0x9B05688C;
238 ctx->state[6] = 0x1F83D9AB;
239 ctx->state[7] = 0x5BE0CD19;
240}
241
242/* Add bytes into the hash */
243void
3cd01911 244SHA256_Update(SHA256_CTX * ctx, const void *in, size_t len)
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245{
246 uint32_t bitlen[2];
247 uint32_t r;
3cd01911 248 const unsigned char *src = in;
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249
250 /* Number of bytes left in the buffer from previous updates */
251 r = (ctx->count[1] >> 3) & 0x3f;
252
253 /* Convert the length into a number of bits */
254 bitlen[1] = ((uint32_t)len) << 3;
255 bitlen[0] = (uint32_t)(len >> 29);
256
257 /* Update number of bits */
258 if ((ctx->count[1] += bitlen[1]) < bitlen[1])
259 ctx->count[0]++;
260 ctx->count[0] += bitlen[0];
261
262 /* Handle the case where we don't need to perform any transforms */
263 if (len < 64 - r) {
264 memcpy(&ctx->buf[r], src, len);
265 return;
266 }
267
268 /* Finish the current block */
269 memcpy(&ctx->buf[r], src, 64 - r);
270 SHA256_Transform(ctx->state, ctx->buf);
271 src += 64 - r;
272 len -= 64 - r;
273
274 /* Perform complete blocks */
275 while (len >= 64) {
276 SHA256_Transform(ctx->state, src);
277 src += 64;
278 len -= 64;
279 }
280
281 /* Copy left over data into buffer */
282 memcpy(ctx->buf, src, len);
283}
284
285/*
286 * SHA-256 finalization. Pads the input data, exports the hash value,
287 * and clears the context state.
288 */
289void
290SHA256_Final(unsigned char digest[32], SHA256_CTX * ctx)
291{
292
293 /* Add padding */
294 SHA256_Pad(ctx);
295
296 /* Write the hash */
297 be32enc_vect(digest, ctx->state, 32);
298
299 /* Clear the context state */
300 memset((void *)ctx, 0, sizeof(*ctx));
301}