Coverage Report

Created: 2025-01-28 06:34

/src/qtbase/src/3rdparty/rfc6234/sha224-256.c
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/************************* sha224-256.c ************************/
2
/***************** See RFC 6234 for details. *******************/
3
/* Copyright (c) 2011 IETF Trust and the persons identified as */
4
/* authors of the code.  All rights reserved.                  */
5
/* See sha.h for terms of use and redistribution.              */
6
7
/*
8
 * Description:
9
 *   This file implements the Secure Hash Algorithms SHA-224 and
10
 *   SHA-256 as defined in the U.S. National Institute of Standards
11
 *   and Technology Federal Information Processing Standards
12
 *   Publication (FIPS PUB) 180-3 published in October 2008
13
 *   and formerly defined in its predecessors, FIPS PUB 180-1
14
 *   and FIP PUB 180-2.
15
 *
16
 *   A combined document showing all algorithms is available at
17
 *       http://csrc.nist.gov/publications/fips/
18
 *              fips180-3/fips180-3_final.pdf
19
 *
20
 *   The SHA-224 and SHA-256 algorithms produce 224-bit and 256-bit
21
 *   message digests for a given data stream.  It should take about
22
 *   2**n steps to find a message with the same digest as a given
23
 *   message and 2**(n/2) to find any two messages with the same
24
 *   digest, when n is the digest size in bits.  Therefore, this
25
 *   algorithm can serve as a means of providing a
26
 *   "fingerprint" for a message.
27
 *
28
 * Portability Issues:
29
 *   SHA-224 and SHA-256 are defined in terms of 32-bit "words".
30
 *   This code uses <stdint.h> (included via "sha.h") to define 32-
31
 *   and 8-bit unsigned integer types.  If your C compiler does not
32
 *   support 32-bit unsigned integers, this code is not
33
 *   appropriate.
34
 *
35
 * Caveats:
36
 *   SHA-224 and SHA-256 are designed to work with messages less
37
 *   than 2^64 bits long.  This implementation uses SHA224/256Input()
38
 *   to hash the bits that are a multiple of the size of an 8-bit
39
 *   octet, and then optionally uses SHA224/256FinalBits()
40
 *   to hash the final few bits of the input.
41
 */
42
43
#include "sha.h"
44
#include "sha-private.h"
45
46
/* Define the SHA shift, rotate left, and rotate right macros */
47
0
#define SHA256_SHR(bits,word)      ((word) >> (bits))
48
#define SHA256_ROTL(bits,word)                         \
49
  (((word) << (bits)) | ((word) >> (32-(bits))))
50
#define SHA256_ROTR(bits,word)                         \
51
0
  (((word) >> (bits)) | ((word) << (32-(bits))))
52
53
/* Define the SHA SIGMA and sigma macros */
54
#define SHA256_SIGMA0(word)   \
55
0
  (SHA256_ROTR( 2,word) ^ SHA256_ROTR(13,word) ^ SHA256_ROTR(22,word))
56
#define SHA256_SIGMA1(word)   \
57
0
  (SHA256_ROTR( 6,word) ^ SHA256_ROTR(11,word) ^ SHA256_ROTR(25,word))
58
#define SHA256_sigma0(word)   \
59
0
  (SHA256_ROTR( 7,word) ^ SHA256_ROTR(18,word) ^ SHA256_SHR( 3,word))
60
#define SHA256_sigma1(word)   \
61
0
  (SHA256_ROTR(17,word) ^ SHA256_ROTR(19,word) ^ SHA256_SHR(10,word))
62
63
/*
64
 * Add "length" to the length.
65
 * Set Corrupted when overflow has occurred.
66
 */
67
/* addTemp commented out by Nokia, static variables are not thread-safe */
68
/* static uint32_t addTemp; */
69
/* 'M' appended to Macro name by Nokia */
70
#define SHA224_256AddLengthM(context, length)              \
71
0
  (addTemp = (context)->Length_Low, (context)->Corrupted = \
72
0
    (((context)->Length_Low += (length)) < addTemp) &&     \
73
0
    (++(context)->Length_High == 0) ? shaInputTooLong :    \
74
0
                                      (context)->Corrupted )
75
76
/* Local Function Prototypes */
77
static int SHA224_256Reset(SHA256Context *context, uint32_t *H0);
78
static void SHA224_256ProcessMessageBlock(SHA256Context *context);
79
static void SHA224_256Finalize(SHA256Context *context,
80
  uint8_t Pad_Byte);
81
static void SHA224_256PadMessage(SHA256Context *context,
82
  uint8_t Pad_Byte);
83
static int SHA224_256ResultN(SHA256Context *context,
84
  uint8_t Message_Digest[ ], int HashSize);
85
86
/* Initial Hash Values: FIPS 180-3 section 5.3.2 */
87
static uint32_t SHA224_H0[SHA256HashSize/4] = {
88
    0xC1059ED8, 0x367CD507, 0x3070DD17, 0xF70E5939,
89
    0xFFC00B31, 0x68581511, 0x64F98FA7, 0xBEFA4FA4
90
};
91
92
/* Initial Hash Values: FIPS 180-3 section 5.3.3 */
93
static uint32_t SHA256_H0[SHA256HashSize/4] = {
94
  0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A,
95
  0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19
96
};
97
98
/*
99
 * SHA224Reset
100
 *
101
 * Description:
102
 *   This function will initialize the SHA224Context in preparation
103
 *   for computing a new SHA224 message digest.
104
 *
105
 * Parameters:
106
 *   context: [in/out]
107
 *     The context to reset.
108
 *
109
 * Returns:
110
 *   sha Error Code.
111
 */
112
int SHA224Reset(SHA224Context *context)
113
0
{
114
0
  return SHA224_256Reset(context, SHA224_H0);
115
0
}
116
117
/*
118
 * SHA224Input
119
 *
120
 * Description:
121
 *   This function accepts an array of octets as the next portion
122
 *   of the message.
123
 *
124
 * Parameters:
125
 *   context: [in/out]
126
 *     The SHA context to update.
127
 *   message_array[ ]: [in]
128
 *     An array of octets representing the next portion of
129
 *     the message.
130
 *   length: [in]
131
 *     The length of the message in message_array.
132
 *
133
 * Returns:
134
 *   sha Error Code.
135
 *
136
 */
137
int SHA224Input(SHA224Context *context, const uint8_t *message_array,
138
    unsigned int length)
139
0
{
140
0
  return SHA256Input(context, message_array, length);
141
0
}
142
143
/*
144
 * SHA224FinalBits
145
 *
146
 * Description:
147
 *   This function will add in any final bits of the message.
148
 *
149
 * Parameters:
150
 *   context: [in/out]
151
 *     The SHA context to update.
152
 *   message_bits: [in]
153
 *     The final bits of the message, in the upper portion of the
154
 *     byte.  (Use 0b###00000 instead of 0b00000### to input the
155
 *     three bits ###.)
156
 *   length: [in]
157
 *     The number of bits in message_bits, between 1 and 7.
158
 *
159
 * Returns:
160
 *   sha Error Code.
161
 */
162
int SHA224FinalBits(SHA224Context *context,
163
                    uint8_t message_bits, unsigned int length)
164
0
{
165
0
  return SHA256FinalBits(context, message_bits, length);
166
0
}
167
168
/*
169
 * SHA224Result
170
 *
171
 * Description:
172
 *   This function will return the 224-bit message digest
173
 *   into the Message_Digest array provided by the caller.
174
 *   NOTE:
175
 *    The first octet of hash is stored in the element with index 0,
176
 *    the last octet of hash in the element with index 27.
177
 *
178
 * Parameters:
179
 *   context: [in/out]
180
 *     The context to use to calculate the SHA hash.
181
 *   Message_Digest[ ]: [out]
182
 *     Where the digest is returned.
183
 *
184
 * Returns:
185
 *   sha Error Code.
186
 */
187
int SHA224Result(SHA224Context *context,
188
    uint8_t Message_Digest[SHA224HashSize])
189
0
{
190
0
  return SHA224_256ResultN(context, Message_Digest, SHA224HashSize);
191
0
}
192
193
/*
194
 * SHA256Reset
195
 *
196
 * Description:
197
 *   This function will initialize the SHA256Context in preparation
198
 *   for computing a new SHA256 message digest.
199
 *
200
 * Parameters:
201
 *   context: [in/out]
202
 *     The context to reset.
203
 *
204
 * Returns:
205
 *   sha Error Code.
206
 */
207
int SHA256Reset(SHA256Context *context)
208
0
{
209
0
  return SHA224_256Reset(context, SHA256_H0);
210
0
}
211
212
/*
213
 * SHA256Input
214
 *
215
 * Description:
216
 *   This function accepts an array of octets as the next portion
217
 *   of the message.
218
 *
219
 * Parameters:
220
 *   context: [in/out]
221
 *     The SHA context to update.
222
 *   message_array[ ]: [in]
223
 *     An array of octets representing the next portion of
224
 *     the message.
225
 *   length: [in]
226
 *     The length of the message in message_array.
227
 *
228
 * Returns:
229
 *   sha Error Code.
230
 */
231
int SHA256Input(SHA256Context *context, const uint8_t *message_array,
232
    unsigned int length)
233
0
{
234
0
  if (!context) return shaNull;
235
0
  if (!length) return shaSuccess;
236
0
  if (!message_array) return shaNull;
237
0
  if (context->Computed) return context->Corrupted = shaStateError;
238
0
  if (context->Corrupted) return context->Corrupted;
239
240
0
  while (length--) {
241
0
    context->Message_Block[context->Message_Block_Index++] =
242
0
            *message_array;
243
244
0
    if ((SHA224_256AddLength(context, 8) == shaSuccess) &&
245
0
      (context->Message_Block_Index == SHA256_Message_Block_Size))
246
0
      SHA224_256ProcessMessageBlock(context);
247
248
0
    message_array++;
249
0
  }
250
251
0
  return context->Corrupted;
252
253
0
}
254
255
/*
256
 * SHA256FinalBits
257
 *
258
 * Description:
259
 *   This function will add in any final bits of the message.
260
 *
261
 * Parameters:
262
 *   context: [in/out]
263
 *     The SHA context to update.
264
 *   message_bits: [in]
265
 *     The final bits of the message, in the upper portion of the
266
 *     byte.  (Use 0b###00000 instead of 0b00000### to input the
267
 *     three bits ###.)
268
 *   length: [in]
269
 *     The number of bits in message_bits, between 1 and 7.
270
 *
271
 * Returns:
272
 *   sha Error Code.
273
 */
274
int SHA256FinalBits(SHA256Context *context,
275
                    uint8_t message_bits, unsigned int length)
276
0
{
277
0
  static uint8_t masks[8] = {
278
0
      /* 0 0b00000000 */ 0x00, /* 1 0b10000000 */ 0x80,
279
0
      /* 2 0b11000000 */ 0xC0, /* 3 0b11100000 */ 0xE0,
280
0
      /* 4 0b11110000 */ 0xF0, /* 5 0b11111000 */ 0xF8,
281
0
      /* 6 0b11111100 */ 0xFC, /* 7 0b11111110 */ 0xFE
282
0
  };
283
0
  static uint8_t markbit[8] = {
284
0
      /* 0 0b10000000 */ 0x80, /* 1 0b01000000 */ 0x40,
285
0
      /* 2 0b00100000 */ 0x20, /* 3 0b00010000 */ 0x10,
286
0
      /* 4 0b00001000 */ 0x08, /* 5 0b00000100 */ 0x04,
287
0
      /* 6 0b00000010 */ 0x02, /* 7 0b00000001 */ 0x01
288
0
  };
289
290
0
  if (!context) return shaNull;
291
0
  if (!length) return shaSuccess;
292
0
  if (context->Corrupted) return context->Corrupted;
293
0
  if (context->Computed) return context->Corrupted = shaStateError;
294
0
  if (length >= 8) return context->Corrupted = shaBadParam;
295
296
0
  SHA224_256AddLength(context, length);
297
0
  SHA224_256Finalize(context, (uint8_t)
298
0
    ((message_bits & masks[length]) | markbit[length]));
299
300
0
  return context->Corrupted;
301
0
}
302
303
/*
304
 * SHA256Result
305
 *
306
 * Description:
307
 *   This function will return the 256-bit message digest
308
 *   into the Message_Digest array provided by the caller.
309
 *   NOTE:
310
 *    The first octet of hash is stored in the element with index 0,
311
 *    the last octet of hash in the element with index 31.
312
 *
313
 * Parameters:
314
 *   context: [in/out]
315
 *     The context to use to calculate the SHA hash.
316
 *   Message_Digest[ ]: [out]
317
 *     Where the digest is returned.
318
 *
319
 * Returns:
320
 *   sha Error Code.
321
 */
322
int SHA256Result(SHA256Context *context,
323
                 uint8_t Message_Digest[SHA256HashSize])
324
0
{
325
0
  return SHA224_256ResultN(context, Message_Digest, SHA256HashSize);
326
0
}
327
328
/*
329
 * SHA224_256Reset
330
 *
331
 * Description:
332
 *   This helper function will initialize the SHA256Context in
333
 *   preparation for computing a new SHA-224 or SHA-256 message digest.
334
 *
335
 * Parameters:
336
 *   context: [in/out]
337
 *     The context to reset.
338
 *   H0[ ]: [in]
339
 *     The initial hash value array to use.
340
 *
341
 * Returns:
342
 *   sha Error Code.
343
 */
344
static int SHA224_256Reset(SHA256Context *context, uint32_t *H0)
345
0
{
346
0
  if (!context) return shaNull;
347
348
0
  context->Length_High = context->Length_Low = 0;
349
0
  context->Message_Block_Index  = 0;
350
351
0
  context->Intermediate_Hash[0] = H0[0];
352
0
  context->Intermediate_Hash[1] = H0[1];
353
0
  context->Intermediate_Hash[2] = H0[2];
354
0
  context->Intermediate_Hash[3] = H0[3];
355
0
  context->Intermediate_Hash[4] = H0[4];
356
0
  context->Intermediate_Hash[5] = H0[5];
357
0
  context->Intermediate_Hash[6] = H0[6];
358
0
  context->Intermediate_Hash[7] = H0[7];
359
360
0
  context->Computed  = 0;
361
0
  context->Corrupted = shaSuccess;
362
363
0
  return shaSuccess;
364
0
}
365
366
/*
367
 * SHA224_256ProcessMessageBlock
368
 *
369
 * Description:
370
 *   This helper function will process the next 512 bits of the
371
 *   message stored in the Message_Block array.
372
 *
373
 * Parameters:
374
 *   context: [in/out]
375
 *     The SHA context to update.
376
 *
377
 * Returns:
378
 *   Nothing.
379
 *
380
 * Comments:
381
 *   Many of the variable names in this code, especially the
382
 *   single character names, were used because those were the
383
 *   names used in the Secure Hash Standard.
384
 */
385
static void SHA224_256ProcessMessageBlock(SHA256Context *context)
386
0
{
387
  /* Constants defined in FIPS 180-3, section 4.2.2 */
388
0
  static const uint32_t K[64] = {
389
0
      0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b,
390
0
      0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01,
391
0
      0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7,
392
0
      0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
393
0
      0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152,
394
0
      0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
395
0
      0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc,
396
0
      0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
397
0
      0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819,
398
0
      0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08,
399
0
      0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f,
400
0
      0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
401
0
      0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
402
0
  };
403
0
  int        t, t4;                   /* Loop counter */
404
0
  uint32_t   temp1, temp2;            /* Temporary word value */
405
0
  uint32_t   W[64];                   /* Word sequence */
406
0
  uint32_t   A, B, C, D, E, F, G, H;  /* Word buffers */
407
408
  /*
409
   * Initialize the first 16 words in the array W
410
   */
411
0
  for (t = t4 = 0; t < 16; t++, t4 += 4)
412
0
    W[t] = (((uint32_t)context->Message_Block[t4]) << 24) |
413
0
           (((uint32_t)context->Message_Block[t4 + 1]) << 16) |
414
0
           (((uint32_t)context->Message_Block[t4 + 2]) << 8) |
415
0
           (((uint32_t)context->Message_Block[t4 + 3]));
416
417
0
  for (t = 16; t < 64; t++)
418
0
    W[t] = SHA256_sigma1(W[t-2]) + W[t-7] +
419
0
        SHA256_sigma0(W[t-15]) + W[t-16];
420
421
0
  A = context->Intermediate_Hash[0];
422
0
  B = context->Intermediate_Hash[1];
423
0
  C = context->Intermediate_Hash[2];
424
0
  D = context->Intermediate_Hash[3];
425
0
  E = context->Intermediate_Hash[4];
426
0
  F = context->Intermediate_Hash[5];
427
0
  G = context->Intermediate_Hash[6];
428
0
  H = context->Intermediate_Hash[7];
429
430
0
  for (t = 0; t < 64; t++) {
431
0
    temp1 = H + SHA256_SIGMA1(E) + SHA_Ch(E,F,G) + K[t] + W[t];
432
0
    temp2 = SHA256_SIGMA0(A) + SHA_Maj(A,B,C);
433
0
    H = G;
434
0
    G = F;
435
0
    F = E;
436
0
    E = D + temp1;
437
0
    D = C;
438
0
    C = B;
439
0
    B = A;
440
0
    A = temp1 + temp2;
441
0
  }
442
443
0
  context->Intermediate_Hash[0] += A;
444
0
  context->Intermediate_Hash[1] += B;
445
0
  context->Intermediate_Hash[2] += C;
446
0
  context->Intermediate_Hash[3] += D;
447
0
  context->Intermediate_Hash[4] += E;
448
0
  context->Intermediate_Hash[5] += F;
449
0
  context->Intermediate_Hash[6] += G;
450
0
  context->Intermediate_Hash[7] += H;
451
452
0
  context->Message_Block_Index = 0;
453
0
}
454
455
/*
456
 * SHA224_256Finalize
457
 *
458
 * Description:
459
 *   This helper function finishes off the digest calculations.
460
 *
461
 * Parameters:
462
 *   context: [in/out]
463
 *     The SHA context to update.
464
 *   Pad_Byte: [in]
465
 *     The last byte to add to the message block before the 0-padding
466
 *     and length.  This will contain the last bits of the message
467
 *     followed by another single bit.  If the message was an
468
 *     exact multiple of 8-bits long, Pad_Byte will be 0x80.
469
 *
470
 * Returns:
471
 *   sha Error Code.
472
 */
473
static void SHA224_256Finalize(SHA256Context *context,
474
    uint8_t Pad_Byte)
475
0
{
476
0
  int i;
477
0
  SHA224_256PadMessage(context, Pad_Byte);
478
  /* message may be sensitive, so clear it out */
479
0
  for (i = 0; i < SHA256_Message_Block_Size; ++i)
480
0
    context->Message_Block[i] = 0;
481
0
  context->Length_High = 0;     /* and clear length */
482
0
  context->Length_Low = 0;
483
0
  context->Computed = 1;
484
0
}
485
486
/*
487
 * SHA224_256PadMessage
488
 *
489
 * Description:
490
 *   According to the standard, the message must be padded to the next
491
 *   even multiple of 512 bits.  The first padding bit must be a '1'.
492
 *   The last 64 bits represent the length of the original message.
493
 *   All bits in between should be 0.  This helper function will pad
494
 *   the message according to those rules by filling the
495
 *   Message_Block array accordingly.  When it returns, it can be
496
 *   assumed that the message digest has been computed.
497
 *
498
 * Parameters:
499
 *   context: [in/out]
500
 *     The context to pad.
501
 *   Pad_Byte: [in]
502
 *     The last byte to add to the message block before the 0-padding
503
 *     and length.  This will contain the last bits of the message
504
 *     followed by another single bit.  If the message was an
505
 *     exact multiple of 8-bits long, Pad_Byte will be 0x80.
506
 *
507
 * Returns:
508
 *   Nothing.
509
 */
510
static void SHA224_256PadMessage(SHA256Context *context,
511
    uint8_t Pad_Byte)
512
0
{
513
  /*
514
   * Check to see if the current message block is too small to hold
515
   * the initial padding bits and length.  If so, we will pad the
516
   * block, process it, and then continue padding into a second
517
   * block.
518
   */
519
0
  if (context->Message_Block_Index >= (SHA256_Message_Block_Size-8)) {
520
0
    context->Message_Block[context->Message_Block_Index++] = Pad_Byte;
521
0
    while (context->Message_Block_Index < SHA256_Message_Block_Size)
522
0
      context->Message_Block[context->Message_Block_Index++] = 0;
523
0
    SHA224_256ProcessMessageBlock(context);
524
0
  } else
525
0
    context->Message_Block[context->Message_Block_Index++] = Pad_Byte;
526
527
0
  while (context->Message_Block_Index < (SHA256_Message_Block_Size-8))
528
0
    context->Message_Block[context->Message_Block_Index++] = 0;
529
530
  /*
531
   * Store the message length as the last 8 octets
532
   */
533
0
  context->Message_Block[56] = (uint8_t)(context->Length_High >> 24);
534
0
  context->Message_Block[57] = (uint8_t)(context->Length_High >> 16);
535
0
  context->Message_Block[58] = (uint8_t)(context->Length_High >> 8);
536
0
  context->Message_Block[59] = (uint8_t)(context->Length_High);
537
0
  context->Message_Block[60] = (uint8_t)(context->Length_Low >> 24);
538
0
  context->Message_Block[61] = (uint8_t)(context->Length_Low >> 16);
539
0
  context->Message_Block[62] = (uint8_t)(context->Length_Low >> 8);
540
0
  context->Message_Block[63] = (uint8_t)(context->Length_Low);
541
542
0
  SHA224_256ProcessMessageBlock(context);
543
0
}
544
545
/*
546
 * SHA224_256ResultN
547
 *
548
 * Description:
549
 *   This helper function will return the 224-bit or 256-bit message
550
 *   digest into the Message_Digest array provided by the caller.
551
 *   NOTE:
552
 *    The first octet of hash is stored in the element with index 0,
553
 *    the last octet of hash in the element with index 27/31.
554
 *
555
 * Parameters:
556
 *   context: [in/out]
557
 *     The context to use to calculate the SHA hash.
558
 *   Message_Digest[ ]: [out]
559
 *     Where the digest is returned.
560
 *   HashSize: [in]
561
 *     The size of the hash, either 28 or 32.
562
 *
563
 * Returns:
564
 *   sha Error Code.
565
 */
566
static int SHA224_256ResultN(SHA256Context *context,
567
    uint8_t Message_Digest[ ], int HashSize)
568
0
{
569
0
  int i;
570
571
0
  if (!context) return shaNull;
572
0
  if (!Message_Digest) return shaNull;
573
0
  if (context->Corrupted) return context->Corrupted;
574
575
0
  if (!context->Computed)
576
0
    SHA224_256Finalize(context, 0x80);
577
578
0
  for (i = 0; i < HashSize; ++i)
579
0
    Message_Digest[i] = (uint8_t)
580
0
      (context->Intermediate_Hash[i>>2] >> 8 * ( 3 - ( i & 0x03 ) ));
581
582
0
  return shaSuccess;
583
0
}