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sha.c
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1 /*
2  * Copyright (C) 2007 Michael Niedermayer <michaelni@gmx.at>
3  * Copyright (C) 2009 Konstantin Shishkov
4  * based on public domain SHA-1 code by Steve Reid <steve@edmweb.com>
5  * and on BSD-licensed SHA-2 code by Aaron D. Gifford
6  *
7  * This file is part of FFmpeg.
8  *
9  * FFmpeg is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License as published by the Free Software Foundation; either
12  * version 2.1 of the License, or (at your option) any later version.
13  *
14  * FFmpeg is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17  * Lesser General Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with FFmpeg; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22  */
23 
24 #include <string.h>
25 
26 #include "attributes.h"
27 #include "avutil.h"
28 #include "bswap.h"
29 #include "sha.h"
30 #include "intreadwrite.h"
31 #include "mem.h"
32 
33 /** hash context */
34 typedef struct AVSHA {
35  uint8_t digest_len; ///< digest length in 32-bit words
36  uint64_t count; ///< number of bytes in buffer
37  uint8_t buffer[64]; ///< 512-bit buffer of input values used in hash updating
38  uint32_t state[8]; ///< current hash value
39  /** function used to update hash for 512-bit input block */
40  void (*transform)(uint32_t *state, const uint8_t buffer[64]);
41 } AVSHA;
42 
43 const int av_sha_size = sizeof(AVSHA);
44 
45 struct AVSHA *av_sha_alloc(void)
46 {
47  return av_mallocz(sizeof(struct AVSHA));
48 }
49 
50 #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
51 
52 /* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
53 #define blk0(i) (block[i] = AV_RB32(buffer + 4 * (i)))
54 #define blk(i) (block[i] = rol(block[(i)-3] ^ block[(i)-8] ^ block[(i)-14] ^ block[(i)-16], 1))
55 
56 #define R0(v,w,x,y,z,i) z += (((w)&((x)^(y)))^(y)) + blk0(i) + 0x5A827999 + rol(v, 5); w = rol(w, 30);
57 #define R1(v,w,x,y,z,i) z += (((w)&((x)^(y)))^(y)) + blk (i) + 0x5A827999 + rol(v, 5); w = rol(w, 30);
58 #define R2(v,w,x,y,z,i) z += ( (w)^(x) ^(y)) + blk (i) + 0x6ED9EBA1 + rol(v, 5); w = rol(w, 30);
59 #define R3(v,w,x,y,z,i) z += ((((w)|(x))&(y))|((w)&(x))) + blk (i) + 0x8F1BBCDC + rol(v, 5); w = rol(w, 30);
60 #define R4(v,w,x,y,z,i) z += ( (w)^(x) ^(y)) + blk (i) + 0xCA62C1D6 + rol(v, 5); w = rol(w, 30);
61 
62 /* Hash a single 512-bit block. This is the core of the algorithm. */
63 
64 static void sha1_transform(uint32_t state[5], const uint8_t buffer[64])
65 {
66  uint32_t block[80];
67  unsigned int i, a, b, c, d, e;
68 
69  a = state[0];
70  b = state[1];
71  c = state[2];
72  d = state[3];
73  e = state[4];
74 #if CONFIG_SMALL
75  for (i = 0; i < 80; i++) {
76  int t;
77  if (i < 16)
78  t = AV_RB32(buffer + 4 * i);
79  else
80  t = rol(block[i-3] ^ block[i-8] ^ block[i-14] ^ block[i-16], 1);
81  block[i] = t;
82  t += e + rol(a, 5);
83  if (i < 40) {
84  if (i < 20)
85  t += ((b&(c^d))^d) + 0x5A827999;
86  else
87  t += ( b^c ^d) + 0x6ED9EBA1;
88  } else {
89  if (i < 60)
90  t += (((b|c)&d)|(b&c)) + 0x8F1BBCDC;
91  else
92  t += ( b^c ^d) + 0xCA62C1D6;
93  }
94  e = d;
95  d = c;
96  c = rol(b, 30);
97  b = a;
98  a = t;
99  }
100 #else
101 
102 #define R1_0 \
103  R0(a, b, c, d, e, 0 + i); \
104  R0(e, a, b, c, d, 1 + i); \
105  R0(d, e, a, b, c, 2 + i); \
106  R0(c, d, e, a, b, 3 + i); \
107  R0(b, c, d, e, a, 4 + i); \
108  i += 5
109 
110  i = 0;
111  R1_0; R1_0; R1_0;
112  R0(a, b, c, d, e, 15);
113  R1(e, a, b, c, d, 16);
114  R1(d, e, a, b, c, 17);
115  R1(c, d, e, a, b, 18);
116  R1(b, c, d, e, a, 19);
117 
118 #define R1_20 \
119  R2(a, b, c, d, e, 0 + i); \
120  R2(e, a, b, c, d, 1 + i); \
121  R2(d, e, a, b, c, 2 + i); \
122  R2(c, d, e, a, b, 3 + i); \
123  R2(b, c, d, e, a, 4 + i); \
124  i += 5
125 
126  i = 20;
127  R1_20; R1_20; R1_20; R1_20;
128 
129 #define R1_40 \
130  R3(a, b, c, d, e, 0 + i); \
131  R3(e, a, b, c, d, 1 + i); \
132  R3(d, e, a, b, c, 2 + i); \
133  R3(c, d, e, a, b, 3 + i); \
134  R3(b, c, d, e, a, 4 + i); \
135  i += 5
136 
137  R1_40; R1_40; R1_40; R1_40;
138 
139 #define R1_60 \
140  R4(a, b, c, d, e, 0 + i); \
141  R4(e, a, b, c, d, 1 + i); \
142  R4(d, e, a, b, c, 2 + i); \
143  R4(c, d, e, a, b, 3 + i); \
144  R4(b, c, d, e, a, 4 + i); \
145  i += 5
146 
147  R1_60; R1_60; R1_60; R1_60;
148 #endif
149  state[0] += a;
150  state[1] += b;
151  state[2] += c;
152  state[3] += d;
153  state[4] += e;
154 }
155 
156 static const uint32_t K256[64] = {
157  0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
158  0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
159  0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
160  0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
161  0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
162  0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
163  0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
164  0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
165  0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
166  0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
167  0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
168  0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
169  0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
170  0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
171  0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
172  0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
173 };
174 
175 
176 #define Ch(x,y,z) (((x) & ((y) ^ (z))) ^ (z))
177 #define Maj(z,y,x) ((((x) | (y)) & (z)) | ((x) & (y)))
178 
179 #define Sigma0_256(x) (rol((x), 30) ^ rol((x), 19) ^ rol((x), 10))
180 #define Sigma1_256(x) (rol((x), 26) ^ rol((x), 21) ^ rol((x), 7))
181 #define sigma0_256(x) (rol((x), 25) ^ rol((x), 14) ^ ((x) >> 3))
182 #define sigma1_256(x) (rol((x), 15) ^ rol((x), 13) ^ ((x) >> 10))
183 
184 #undef blk
185 #define blk(i) (block[i] = block[i - 16] + sigma0_256(block[i - 15]) + \
186  sigma1_256(block[i - 2]) + block[i - 7])
187 
188 #define ROUND256(a,b,c,d,e,f,g,h) \
189  T1 += (h) + Sigma1_256(e) + Ch((e), (f), (g)) + K256[i]; \
190  (d) += T1; \
191  (h) = T1 + Sigma0_256(a) + Maj((a), (b), (c)); \
192  i++
193 
194 #define ROUND256_0_TO_15(a,b,c,d,e,f,g,h) \
195  T1 = blk0(i); \
196  ROUND256(a,b,c,d,e,f,g,h)
197 
198 #define ROUND256_16_TO_63(a,b,c,d,e,f,g,h) \
199  T1 = blk(i); \
200  ROUND256(a,b,c,d,e,f,g,h)
201 
202 static void sha256_transform(uint32_t *state, const uint8_t buffer[64])
203 {
204  unsigned int i, a, b, c, d, e, f, g, h;
205  uint32_t block[64];
206  uint32_t T1;
207 
208  a = state[0];
209  b = state[1];
210  c = state[2];
211  d = state[3];
212  e = state[4];
213  f = state[5];
214  g = state[6];
215  h = state[7];
216 #if CONFIG_SMALL
217  for (i = 0; i < 64; i++) {
218  uint32_t T2;
219  if (i < 16)
220  T1 = blk0(i);
221  else
222  T1 = blk(i);
223  T1 += h + Sigma1_256(e) + Ch(e, f, g) + K256[i];
224  T2 = Sigma0_256(a) + Maj(a, b, c);
225  h = g;
226  g = f;
227  f = e;
228  e = d + T1;
229  d = c;
230  c = b;
231  b = a;
232  a = T1 + T2;
233  }
234 #else
235 
236  i = 0;
237 #define R256_0 \
238  ROUND256_0_TO_15(a, b, c, d, e, f, g, h); \
239  ROUND256_0_TO_15(h, a, b, c, d, e, f, g); \
240  ROUND256_0_TO_15(g, h, a, b, c, d, e, f); \
241  ROUND256_0_TO_15(f, g, h, a, b, c, d, e); \
242  ROUND256_0_TO_15(e, f, g, h, a, b, c, d); \
243  ROUND256_0_TO_15(d, e, f, g, h, a, b, c); \
244  ROUND256_0_TO_15(c, d, e, f, g, h, a, b); \
245  ROUND256_0_TO_15(b, c, d, e, f, g, h, a)
246 
247  R256_0; R256_0;
248 
249 #define R256_16 \
250  ROUND256_16_TO_63(a, b, c, d, e, f, g, h); \
251  ROUND256_16_TO_63(h, a, b, c, d, e, f, g); \
252  ROUND256_16_TO_63(g, h, a, b, c, d, e, f); \
253  ROUND256_16_TO_63(f, g, h, a, b, c, d, e); \
254  ROUND256_16_TO_63(e, f, g, h, a, b, c, d); \
255  ROUND256_16_TO_63(d, e, f, g, h, a, b, c); \
256  ROUND256_16_TO_63(c, d, e, f, g, h, a, b); \
257  ROUND256_16_TO_63(b, c, d, e, f, g, h, a)
258 
261 #endif
262  state[0] += a;
263  state[1] += b;
264  state[2] += c;
265  state[3] += d;
266  state[4] += e;
267  state[5] += f;
268  state[6] += g;
269  state[7] += h;
270 }
271 
272 
274 {
275  ctx->digest_len = bits >> 5;
276  switch (bits) {
277  case 160: // SHA-1
278  ctx->state[0] = 0x67452301;
279  ctx->state[1] = 0xEFCDAB89;
280  ctx->state[2] = 0x98BADCFE;
281  ctx->state[3] = 0x10325476;
282  ctx->state[4] = 0xC3D2E1F0;
283  ctx->transform = sha1_transform;
284  break;
285  case 224: // SHA-224
286  ctx->state[0] = 0xC1059ED8;
287  ctx->state[1] = 0x367CD507;
288  ctx->state[2] = 0x3070DD17;
289  ctx->state[3] = 0xF70E5939;
290  ctx->state[4] = 0xFFC00B31;
291  ctx->state[5] = 0x68581511;
292  ctx->state[6] = 0x64F98FA7;
293  ctx->state[7] = 0xBEFA4FA4;
295  break;
296  case 256: // SHA-256
297  ctx->state[0] = 0x6A09E667;
298  ctx->state[1] = 0xBB67AE85;
299  ctx->state[2] = 0x3C6EF372;
300  ctx->state[3] = 0xA54FF53A;
301  ctx->state[4] = 0x510E527F;
302  ctx->state[5] = 0x9B05688C;
303  ctx->state[6] = 0x1F83D9AB;
304  ctx->state[7] = 0x5BE0CD19;
306  break;
307  default:
308  return AVERROR(EINVAL);
309  }
310  ctx->count = 0;
311  return 0;
312 }
313 
314 void av_sha_update(AVSHA* ctx, const uint8_t* data, unsigned int len)
315 {
316  unsigned int i, j;
317 
318  j = ctx->count & 63;
319  ctx->count += len;
320 #if CONFIG_SMALL
321  for (i = 0; i < len; i++) {
322  ctx->buffer[j++] = data[i];
323  if (64 == j) {
324  ctx->transform(ctx->state, ctx->buffer);
325  j = 0;
326  }
327  }
328 #else
329  if ((j + len) > 63) {
330  memcpy(&ctx->buffer[j], data, (i = 64 - j));
331  ctx->transform(ctx->state, ctx->buffer);
332  for (; i + 63 < len; i += 64)
333  ctx->transform(ctx->state, &data[i]);
334  j = 0;
335  } else
336  i = 0;
337  memcpy(&ctx->buffer[j], &data[i], len - i);
338 #endif
339 }
340 
341 void av_sha_final(AVSHA* ctx, uint8_t *digest)
342 {
343  int i;
344  uint64_t finalcount = av_be2ne64(ctx->count << 3);
345 
346  av_sha_update(ctx, "\200", 1);
347  while ((ctx->count & 63) != 56)
348  av_sha_update(ctx, "", 1);
349  av_sha_update(ctx, (uint8_t *)&finalcount, 8); /* Should cause a transform() */
350  for (i = 0; i < ctx->digest_len; i++)
351  AV_WB32(digest + i*4, ctx->state[i]);
352 }
void av_sha_final(AVSHA *ctx, uint8_t *digest)
Finish hashing and output digest value.
Definition: sha.c:341
#define R256_0
void av_sha_update(AVSHA *ctx, const uint8_t *data, unsigned int len)
Update hash value.
Definition: sha.c:314
hash context
Definition: sha.c:34
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
av_cold int av_sha_init(AVSHA *ctx, int bits)
Initialize SHA-1 or SHA-2 hashing.
Definition: sha.c:273
memory handling functions
const char * g
Definition: vf_curves.c:108
const char * b
Definition: vf_curves.c:109
#define Sigma1_256(x)
Definition: sha.c:180
external API header
#define R1_0
#define blk(i)
Definition: sha.c:185
Macro definitions for various function/variable attributes.
static int16_t block[64]
Definition: dct.c:113
uint8_t bits
Definition: crc.c:296
uint8_t
#define av_cold
Definition: attributes.h:82
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:87
void(* transform)(uint32_t *state, const uint8_t buffer[64])
function used to update hash for 512-bit input block
Definition: sha.c:40
#define rol(value, bits)
Definition: sha.c:50
#define AVERROR(e)
Definition: error.h:43
uint8_t buffer[64]
512-bit buffer of input values used in hash updating
Definition: sha.c:37
#define R0(v, w, x, y, z, i)
Definition: sha.c:56
#define av_be2ne64(x)
Definition: bswap.h:94
#define R1(v, w, x, y, z, i)
Definition: sha.c:57
typedef void(APIENTRY *FF_PFNGLACTIVETEXTUREPROC)(GLenum texture)
AVFormatContext * ctx
Definition: movenc.c:48
uint64_t count
number of bytes in buffer
Definition: sha.c:36
#define Maj(z, y, x)
Definition: sha.c:177
static void sha256_transform(uint32_t *state, const uint8_t buffer[64])
Definition: sha.c:202
uint32_t state[8]
current hash value
Definition: sha.c:38
#define R1_60
#define R256_16
#define R1_20
struct AVSHA * av_sha_alloc(void)
Allocate an AVSHA context.
Definition: sha.c:45
#define AV_WB32(p, v)
Definition: intreadwrite.h:419
byte swapping routines
#define R1_40
uint8_t digest_len
digest length in 32-bit words
Definition: sha.c:35
#define blk0(i)
Definition: sha.c:53
static const uint32_t K256[64]
Definition: sha.c:156
static double c[64]
static struct @229 state
const int av_sha_size
Definition: sha.c:43
int len
#define Sigma0_256(x)
Definition: sha.c:179
#define Ch(x, y, z)
Definition: sha.c:176
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:252
GLuint buffer
Definition: opengl_enc.c:102
static void sha1_transform(uint32_t state[5], const uint8_t buffer[64])
Definition: sha.c:64