summaryrefslogtreecommitdiffstats
path: root/src/vppinfra/crypto/sha2.h
blob: 51006151365725252150744b1a45422cde2820e1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
/*
 * Copyright (c) 2019 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef included_sha2_h
#define included_sha2_h

#include <vppinfra/clib.h>
#include <vppinfra/vector.h>

#define SHA224_DIGEST_SIZE 28
#define SHA224_BLOCK_SIZE  64

#define SHA256_DIGEST_SIZE  32
#define SHA256_BLOCK_SIZE   64
#define SHA256_ROTR(x, y)   ((x >> y) | (x << (32 - y)))
#define SHA256_CH(a, b, c)  ((a & b) ^ (~a & c))
#define SHA256_MAJ(a, b, c) ((a & b) ^ (a & c) ^ (b & c))
#define SHA256_CSIGMA0(x)                                                     \
  (SHA256_ROTR (x, 2) ^ SHA256_ROTR (x, 13) ^ SHA256_ROTR (x, 22));
#define SHA256_CSIGMA1(x)                                                     \
  (SHA256_ROTR (x, 6) ^ SHA256_ROTR (x, 11) ^ SHA256_ROTR (x, 25));
#define SHA256_SSIGMA0(x) (SHA256_ROTR (x, 7) ^ SHA256_ROTR (x, 18) ^ (x >> 3))
#define SHA256_SSIGMA1(x)                                                     \
  (SHA256_ROTR (x, 17) ^ SHA256_ROTR (x, 19) ^ (x >> 10))

#define SHA256_MSG_SCHED(w, j)                                                \
  {                                                                           \
    w[j] = w[j - 7] + w[j - 16];                                              \
    w[j] += SHA256_SSIGMA0 (w[j - 15]);                                       \
    w[j] += SHA256_SSIGMA1 (w[j - 2]);                                        \
  }

#define SHA256_TRANSFORM(s, w, i, k)                                          \
  {                                                                           \
    __typeof__ (s[0]) t1, t2;                                                 \
    t1 = k + w[i] + s[7];                                                     \
    t1 += SHA256_CSIGMA1 (s[4]);                                              \
    t1 += SHA256_CH (s[4], s[5], s[6]);                                       \
    t2 = SHA256_CSIGMA0 (s[0]);                                               \
    t2 += SHA256_MAJ (s[0], s[1], s[2]);                                      \
    s[7] = s[6];                                                              \
    s[6] = s[5];                                                              \
    s[5] = s[4];                                                              \
    s[4] = s[3] + t1;                                                         \
    s[3] = s[2];                                                              \
    s[2] = s[1];                                                              \
    s[1] = s[0];                                                              \
    s[0] = t1 + t2;                                                           \
  }

#define SHA512_224_DIGEST_SIZE 28
#define SHA512_224_BLOCK_SIZE  128

#define SHA512_256_DIGEST_SIZE 32
#define SHA512_256_BLOCK_SIZE  128

#define SHA384_DIGEST_SIZE 48
#define SHA384_BLOCK_SIZE  128

#define SHA512_DIGEST_SIZE  64
#define SHA512_BLOCK_SIZE   128
#define SHA512_ROTR(x, y)   ((x >> y) | (x << (64 - y)))
#define SHA512_CH(a, b, c)  ((a & b) ^ (~a & c))
#define SHA512_MAJ(a, b, c) ((a & b) ^ (a & c) ^ (b & c))
#define SHA512_CSIGMA0(x)                                                     \
  (SHA512_ROTR (x, 28) ^ SHA512_ROTR (x, 34) ^ SHA512_ROTR (x, 39))
#define SHA512_CSIGMA1(x)                                                     \
  (SHA512_ROTR (x, 14) ^ SHA512_ROTR (x, 18) ^ SHA512_ROTR (x, 41))
#define SHA512_SSIGMA0(x) (SHA512_ROTR (x, 1) ^ SHA512_ROTR (x, 8) ^ (x >> 7))
#define SHA512_SSIGMA1(x)                                                     \
  (SHA512_ROTR (x, 19) ^ SHA512_ROTR (x, 61) ^ (x >> 6))

#define SHA512_MSG_SCHED(w, j)                                                \
  {                                                                           \
    w[j] = w[j - 7] + w[j - 16];                                              \
    w[j] += SHA512_SSIGMA0 (w[j - 15]);                                       \
    w[j] += SHA512_SSIGMA1 (w[j - 2]);                                        \
  }

#define SHA512_TRANSFORM(s, w, i, k)                                          \
  {                                                                           \
    __typeof__ (s[0]) t1, t2;                                                 \
    t1 = k + w[i] + s[7];                                                     \
    t1 += SHA512_CSIGMA1 (s[4]);                                              \
    t1 += SHA512_CH (s[4], s[5], s[6]);                                       \
    t2 = SHA512_CSIGMA0 (s[0]);                                               \
    t2 += SHA512_MAJ (s[0], s[1], s[2]);                                      \
    s[7] = s[6];                                                              \
    s[6] = s[5];                                                              \
    s[5] = s[4];                                                              \
    s[4] = s[3] + t1;                                                         \
    s[3] = s[2];                                                              \
    s[2] = s[1];                                                              \
    s[1] = s[0];                                                              \
    s[0] = t1 + t2;                                                           \
  }

#if defined(__SHA__) && defined(__x86_64__)
#define CLIB_SHA256_ISA_INTEL
#define CLIB_SHA256_ISA
#endif

#ifdef __ARM_FEATURE_SHA2
#define CLIB_SHA256_ISA_ARM
#define CLIB_SHA256_ISA
#endif

static const u32 sha224_h[8] = { 0xc1059ed8, 0x367cd507, 0x3070dd17,
				 0xf70e5939, 0xffc00b31, 0x68581511,
				 0x64f98fa7, 0xbefa4fa4 };

static const u32 sha256_h[8] = { 0x6a09e667, 0xbb67ae85, 0x3c6ef372,
				 0xa54ff53a, 0x510e527f, 0x9b05688c,
				 0x1f83d9ab, 0x5be0cd19 };

static const u32 sha256_k[64] = {
  0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1,
  0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
  0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786,
  0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
  0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
  0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
  0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b,
  0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
  0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a,
  0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
  0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
};

static const u64 sha384_h[8] = { 0xcbbb9d5dc1059ed8, 0x629a292a367cd507,
				 0x9159015a3070dd17, 0x152fecd8f70e5939,
				 0x67332667ffc00b31, 0x8eb44a8768581511,
				 0xdb0c2e0d64f98fa7, 0x47b5481dbefa4fa4 };

static const u64 sha512_h[8] = { 0x6a09e667f3bcc908, 0xbb67ae8584caa73b,
				 0x3c6ef372fe94f82b, 0xa54ff53a5f1d36f1,
				 0x510e527fade682d1, 0x9b05688c2b3e6c1f,
				 0x1f83d9abfb41bd6b, 0x5be0cd19137e2179 };

static const u64 sha512_224_h[8] = { 0x8c3d37c819544da2, 0x73e1996689dcd4d6,
				     0x1dfab7ae32ff9c82, 0x679dd514582f9fcf,
				     0x0f6d2b697bd44da8, 0x77e36f7304c48942,
				     0x3f9d85a86a1d36c8, 0x1112e6ad91d692a1 };

static const u64 sha512_256_h[8] = { 0x22312194fc2bf72c, 0x9f555fa3c84c64c2,
				     0x2393b86b6f53b151, 0x963877195940eabd,
				     0x96283ee2a88effe3, 0xbe5e1e2553863992,
				     0x2b0199fc2c85b8aa, 0x0eb72ddc81c52ca2 };

static const u64 sha512_k[80] = {
  0x428a2f98d728ae22, 0x7137449123ef65cd, 0xb5c0fbcfec4d3b2f,
  0xe9b5dba58189dbbc, 0x3956c25bf348b538, 0x59f111f1b605d019,
  0x923f82a4af194f9b, 0xab1c5ed5da6d8118, 0xd807aa98a3030242,
  0x12835b0145706fbe, 0x243185be4ee4b28c, 0x550c7dc3d5ffb4e2,
  0x72be5d74f27b896f, 0x80deb1fe3b1696b1, 0x9bdc06a725c71235,
  0xc19bf174cf692694, 0xe49b69c19ef14ad2, 0xefbe4786384f25e3,
  0x0fc19dc68b8cd5b5, 0x240ca1cc77ac9c65, 0x2de92c6f592b0275,
  0x4a7484aa6ea6e483, 0x5cb0a9dcbd41fbd4, 0x76f988da831153b5,
  0x983e5152ee66dfab, 0xa831c66d2db43210, 0xb00327c898fb213f,
  0xbf597fc7beef0ee4, 0xc6e00bf33da88fc2, 0xd5a79147930aa725,
  0x06ca6351e003826f, 0x142929670a0e6e70, 0x27b70a8546d22ffc,
  0x2e1b21385c26c926, 0x4d2c6dfc5ac42aed, 0x53380d139d95b3df,
  0x650a73548baf63de, 0x766a0abb3c77b2a8, 0x81c2c92e47edaee6,
  0x92722c851482353b, 0xa2bfe8a14cf10364, 0xa81a664bbc423001,
  0xc24b8b70d0f89791, 0xc76c51a30654be30, 0xd192e819d6ef5218,
  0xd69906245565a910, 0xf40e35855771202a, 0x106aa07032bbd1b8,
  0x19a4c116b8d2d0c8, 0x1e376c085141ab53, 0x2748774cdf8eeb99,
  0x34b0bcb5e19b48a8, 0x391c0cb3c5c95a63, 0x4ed8aa4ae3418acb,
  0x5b9cca4f7763e373, 0x682e6ff3d6b2b8a3, 0x748f82ee5defb2fc,
  0x78a5636f43172f60, 0x84c87814a1f0ab72, 0x8cc702081a6439ec,
  0x90befffa23631e28, 0xa4506cebde82bde9, 0xbef9a3f7b2c67915,
  0xc67178f2e372532b, 0xca273eceea26619c, 0xd186b8c721c0c207,
  0xeada7dd6cde0eb1e, 0xf57d4f7fee6ed178, 0x06f067aa72176fba,
  0x0a637dc5a2c898a6, 0x113f9804bef90dae, 0x1b710b35131c471b,
  0x28db77f523047d84, 0x32caab7b40c72493, 0x3c9ebe0a15c9bebc,
  0x431d67c49c100d4c, 0x4cc5d4becb3e42b6, 0x597f299cfc657e2a,
  0x5fcb6fab3ad6faec, 0x6c44198c4a475817
};

typedef enum
{
  CLIB_SHA2_224,
  CLIB_SHA2_256,
  CLIB_SHA2_384,
  CLIB_SHA2_512,
  CLIB_SHA2_512_224,
  CLIB_SHA2_512_256,
} clib_sha2_type_t;

#define SHA2_MAX_BLOCK_SIZE  SHA512_BLOCK_SIZE
#define SHA2_MAX_DIGEST_SIZE SHA512_DIGEST_SIZE

typedef struct
{
  u64 total_bytes;
  u16 n_pending;
  u8 block_size;
  u8 digest_size;
  union
  {
    u32 h32[8];
    u64 h64[8];
#ifdef CLIB_SHA256_ISA
    u32x4 h32x4[2];
#endif
  };
  union
  {
    u8 as_u8[SHA2_MAX_BLOCK_SIZE];
    u64 as_u64[SHA2_MAX_BLOCK_SIZE / sizeof (u64)];
    uword as_uword[SHA2_MAX_BLOCK_SIZE / sizeof (uword)];
  } pending;
} clib_sha2_ctx_t;

static_always_inline void
clib_sha2_init (clib_sha2_ctx_t *ctx, clib_sha2_type_t type)
{
  const u32 *h32 = 0;
  const u64 *h64 = 0;

  ctx->total_bytes = 0;
  ctx->n_pending = 0;

  switch (type)
    {
    case CLIB_SHA2_224:
      h32 = sha224_h;
      ctx->block_size = SHA224_BLOCK_SIZE;
      ctx->digest_size = SHA224_DIGEST_SIZE;
      break;
    case CLIB_SHA2_256:
      h32 = sha256_h;
      ctx->block_size = SHA256_BLOCK_SIZE;
      ctx->digest_size = SHA256_DIGEST_SIZE;
      break;
    case CLIB_SHA2_384:
      h64 = sha384_h;
      ctx->block_size = SHA384_BLOCK_SIZE;
      ctx->digest_size = SHA384_DIGEST_SIZE;
      break;
    case CLIB_SHA2_512:
      h64 = sha512_h;
      ctx->block_size = SHA512_BLOCK_SIZE;
      ctx->digest_size = SHA512_DIGEST_SIZE;
      break;
    case CLIB_SHA2_512_224:
      h64 = sha512_224_h;
      ctx->block_size = SHA512_224_BLOCK_SIZE;
      ctx->digest_size = SHA512_224_DIGEST_SIZE;
      break;
    case CLIB_SHA2_512_256:
      h64 = sha512_256_h;
      ctx->block_size = SHA512_256_BLOCK_SIZE;
      ctx->digest_size = SHA512_256_DIGEST_SIZE;
      break;
    }
  if (h32)
    for (int i = 0; i < 8; i++)
      ctx->h32[i] = h32[i];

  if (h64)
    for (int i = 0; i < 8; i++)
      ctx->h64[i] = h64[i];
}

#ifdef CLIB_SHA256_ISA
static inline void
clib_sha256_vec_cycle_w (u32x4 w[], u8 i)
{
  u8 j = (i + 1) % 4;
  u8 k = (i + 2) % 4;
  u8 l = (i + 3) % 4;
#ifdef CLIB_SHA256_ISA_INTEL
  w[i] = (u32x4) _mm_sha256msg1_epu32 ((__m128i) w[i], (__m128i) w[j]);
  w[i] += (u32x4) _mm_alignr_epi8 ((__m128i) w[l], (__m128i) w[k], 4);
  w[i] = (u32x4) _mm_sha256msg2_epu32 ((__m128i) w[i], (__m128i) w[l]);
#elif defined(CLIB_SHA256_ISA_ARM)
  w[i] = vsha256su1q_u32 (vsha256su0q_u32 (w[i], w[j]), w[k], w[l]);
#endif
}

static inline void
clib_sha256_vec_4_rounds (u32x4 w, u8 n, u32x4 s[])
{
#ifdef CLIB_SHA256_ISA_INTEL
  u32x4 r = *(u32x4 *) (sha256_k + 4 * n) + w;
  s[0] = (u32x4) _mm_sha256rnds2_epu32 ((__m128i) s[0], (__m128i) s[1],
					(__m128i) r);
  r = (u32x4) u64x2_interleave_hi ((u64x2) r, (u64x2) r);
  s[1] = (u32x4) _mm_sha256rnds2_epu32 ((__m128i) s[1], (__m128i) s[0],
					(__m128i) r);
#elif defined(CLIB_SHA256_ISA_ARM)
  u32x4 r0, s0;
  const u32x4u *k = (u32x4u *) sha256_k;

  r0 = w + k[n];
  s0 = s[0];
  s[0] = vsha256hq_u32 (s[0], s[1], r0);
  s[1] = vsha256h2q_u32 (s[1], s0, r0);
#endif
}
#endif

#if defined(CLIB_SHA256_ISA)
static inline u32x4
clib_sha256_vec_load (u32x4 r)
{
#if defined(CLIB_SHA256_ISA_INTEL)
  return u32x4_byte_swap (r);
#elif defined(CLIB_SHA256_ISA_ARM)
  return vreinterpretq_u32_u8 (vrev32q_u8 (vreinterpretq_u8_u32 (r)));
#endif
}

static inline void
clib_sha256_vec_shuffle (u32x4 d[2])
{
#if defined(CLIB_SHA256_ISA_INTEL)
  /* {0, 1, 2, 3}, {4, 5, 6, 7} -> {7, 6, 3, 2}, {5, 4, 1, 0} */
  u32x4 r;
  r = (u32x4) _mm_shuffle_ps ((__m128) d[1], (__m128) d[0], 0xbb);
  d[1] = (u32x4) _mm_shuffle_ps ((__m128) d[1], (__m128) d[0], 0x11);
  d[0] = r;
#endif
}
#endif

static inline void
clib_sha256_block (clib_sha2_ctx_t *ctx, const u8 *msg, uword n_blocks)
{
#if defined(CLIB_SHA256_ISA)
  u32x4 h[2];
  u32x4u *m = (u32x4u *) msg;

  h[0] = ctx->h32x4[0];
  h[1] = ctx->h32x4[1];

  clib_sha256_vec_shuffle (h);

  for (; n_blocks; m += 4, n_blocks--)
    {
      u32x4 s[2], w[4];

      s[0] = h[0];
      s[1] = h[1];

      w[0] = clib_sha256_vec_load (m[0]);
      w[1] = clib_sha256_vec_load (m[1]);
      w[2] = clib_sha256_vec_load (m[2]);
      w[3] = clib_sha256_vec_load (m[3]);

      clib_sha256_vec_4_rounds (w[0], 0, s);
      clib_sha256_vec_4_rounds (w[1], 1, s);
      clib_sha256_vec_4_rounds (w[2], 2, s);
      clib_sha256_vec_4_rounds (w[3], 3, s);

      clib_sha256_vec_cycle_w (w, 0);
      clib_sha256_vec_4_rounds (w[0], 4, s);
      clib_sha256_vec_cycle_w (w, 1);
      clib_sha256_vec_4_rounds (w[1], 5, s);
      clib_sha256_vec_cycle_w (w, 2);
      clib_sha256_vec_4_rounds (w[2], 6, s);
      clib_sha256_vec_cycle_w (w, 3);
      clib_sha256_vec_4_rounds (w[3], 7, s);

      clib_sha256_vec_cycle_w (w, 0);
      clib_sha256_vec_4_rounds (w[0], 8, s);
      clib_sha256_vec_cycle_w (w, 1);
      clib_sha256_vec_4_rounds (w[1], 9, s);
      clib_sha256_vec_cycle_w (w, 2);
      clib_sha256_vec_4_rounds (w[2], 10, s);
      clib_sha256_vec_cycle_w (w, 3);
      clib_sha256_vec_4_rounds (w[3], 11, s);

      clib_sha256_vec_cycle_w (w, 0);
      clib_sha256_vec_4_rounds (w[0], 12, s);
      clib_sha256_vec_cycle_w (w, 1);
      clib_sha256_vec_4_rounds (w[1], 13, s);
      clib_sha256_vec_cycle_w (w, 2);
      clib_sha256_vec_4_rounds (w[2], 14, s);
      clib_sha256_vec_cycle_w (w, 3);
      clib_sha256_vec_4_rounds (w[3], 15, s);

      h[0] += s[0];
      h[1] += s[1];
    }

  clib_sha256_vec_shuffle (h);

  ctx->h32x4[0] = h[0];
  ctx->h32x4[1] = h[1];
#else
  u32 w[64], s[8], i;

  while (n_blocks)
    {
      for (i = 0; i < 8; i++)
	s[i] = ctx->h32[i];

      for (i = 0; i < 16; i++)
	{
	  w[i] = clib_net_to_host_u32 (*((u32 *) msg + i));
	  SHA256_TRANSFORM (s, w, i, sha256_k[i]);
	}

      for (i = 16; i < 64; i++)
	{
	  SHA256_MSG_SCHED (w, i);
	  SHA256_TRANSFORM (s, w, i, sha256_k[i]);
	}

      for (i = 0; i < 8; i++)
	ctx->h32[i] += s[i];

      /* next */
      msg += SHA256_BLOCK_SIZE;
      n_blocks--;
    }
#endif
}

static_always_inline void
clib_sha512_block (clib_sha2_ctx_t *ctx, const u8 *msg, uword n_blocks)
{
  u64 w[80], s[8], i;

  while (n_blocks)
    {
      for (i = 0; i < 8; i++)
	s[i] = ctx->h64[i];

      for (i = 0; i < 16; i++)
	{
	  w[i] = clib_net_to_host_u64 (*((u64 *) msg + i));
	  SHA512_TRANSFORM (s, w, i, sha512_k[i]);
	}

      for (i = 16; i < 80; i++)
	{
	  SHA512_MSG_SCHED (w, i);
	  SHA512_TRANSFORM (s, w, i, sha512_k[i]);
	}

      for (i = 0; i < 8; i++)
	ctx->h64[i] += s[i];

      /* next */
      msg += SHA512_BLOCK_SIZE;
      n_blocks--;
    }
}

static_always_inline void
clib_sha2_update (clib_sha2_ctx_t *ctx, const u8 *msg, uword n_bytes)
{
  uword n_blocks;
  if (ctx->n_pending)
    {
      uword n_left = ctx->block_size - ctx->n_pending;
      if (n_bytes < n_left)
	{
	  clib_memcpy_fast (ctx->pending.as_u8 + ctx->n_pending, msg, n_bytes);
	  ctx->n_pending += n_bytes;
	  return;
	}
      else
	{
	  clib_memcpy_fast (ctx->pending.as_u8 + ctx->n_pending, msg, n_left);
	  if (ctx->block_size == SHA512_BLOCK_SIZE)
	    clib_sha512_block (ctx, ctx->pending.as_u8, 1);
	  else
	    clib_sha256_block (ctx, ctx->pending.as_u8, 1);
	  ctx->n_pending = 0;
	  ctx->total_bytes += ctx->block_size;
	  n_bytes -= n_left;
	  msg += n_left;
	}
    }

  if ((n_blocks = n_bytes / ctx->block_size))
    {
      if (ctx->block_size == SHA512_BLOCK_SIZE)
	clib_sha512_block (ctx, msg, n_blocks);
      else
	clib_sha256_block (ctx, msg, n_blocks);
      n_bytes -= n_blocks * ctx->block_size;
      msg += n_blocks * ctx->block_size;
      ctx->total_bytes += n_blocks * ctx->block_size;
    }

  if (n_bytes)
    {
      clib_memset_u8 (ctx->pending.as_u8, 0, ctx->block_size);
      clib_memcpy_fast (ctx->pending.as_u8, msg, n_bytes);
      ctx->n_pending = n_bytes;
    }
  else
    ctx->n_pending = 0;
}

static_always_inline void
clib_sha2_final (clib_sha2_ctx_t *ctx, u8 *digest)
{
  int i;

  ctx->total_bytes += ctx->n_pending;
  if (ctx->n_pending == 0)
    {
      clib_memset (ctx->pending.as_u8, 0, ctx->block_size);
      ctx->pending.as_u8[0] = 0x80;
    }
  else if (ctx->n_pending + sizeof (u64) + sizeof (u8) > ctx->block_size)
    {
      ctx->pending.as_u8[ctx->n_pending] = 0x80;
      if (ctx->block_size == SHA512_BLOCK_SIZE)
	clib_sha512_block (ctx, ctx->pending.as_u8, 1);
      else
	clib_sha256_block (ctx, ctx->pending.as_u8, 1);
      clib_memset (ctx->pending.as_u8, 0, ctx->block_size);
    }
  else
    ctx->pending.as_u8[ctx->n_pending] = 0x80;

  ctx->pending.as_u64[ctx->block_size / 8 - 1] =
    clib_net_to_host_u64 (ctx->total_bytes * 8);
  if (ctx->block_size == SHA512_BLOCK_SIZE)
    clib_sha512_block (ctx, ctx->pending.as_u8, 1);
  else
    clib_sha256_block (ctx, ctx->pending.as_u8, 1);

  if (ctx->block_size == SHA512_BLOCK_SIZE)
    {
      for (i = 0; i < ctx->digest_size / sizeof (u64); i++)
	*((u64 *) digest + i) = clib_net_to_host_u64 (ctx->h64[i]);

      /* sha512-224 case - write half of u64 */
      if (i * sizeof (u64) < ctx->digest_size)
	*((u32 *) digest + 2 * i) = clib_net_to_host_u32 (ctx->h64[i] >> 32);
    }
  else
    for (i = 0; i < ctx->digest_size / sizeof (u32); i++)
      *((u32 *) digest + i) = clib_net_to_host_u32 (ctx->h32[i]);
}

static_always_inline void
clib_sha2 (clib_sha2_type_t type, const u8 *msg, uword len, u8 *digest)
{
  clib_sha2_ctx_t ctx;
  clib_sha2_init (&ctx, type);
  clib_sha2_update (&ctx, msg, len);
  clib_sha2_final (&ctx, digest);
}

#define clib_sha224(...)     clib_sha2 (CLIB_SHA2_224, __VA_ARGS__)
#define clib_sha256(...)     clib_sha2 (CLIB_SHA2_256, __VA_ARGS__)
#define clib_sha384(...)     clib_sha2 (CLIB_SHA2_384, __VA_ARGS__)
#define clib_sha512(...)     clib_sha2 (CLIB_SHA2_512, __VA_ARGS__)
#define clib_sha512_224(...) clib_sha2 (CLIB_SHA2_512_224, __VA_ARGS__)
#define clib_sha512_256(...) clib_sha2 (CLIB_SHA2_512_256, __VA_ARGS__)

static_always_inline void
clib_hmac_sha2 (clib_sha2_type_t type, const u8 *key, uword key_len,
		const u8 *msg, uword len, u8 *digest)
{
  clib_sha2_ctx_t _ctx, *ctx = &_ctx;
  uword key_data[SHA2_MAX_BLOCK_SIZE / sizeof (uword)];
  u8 i_digest[SHA2_MAX_DIGEST_SIZE];
  int i, n_words;

  clib_sha2_init (ctx, type);
  n_words = ctx->block_size / sizeof (uword);

  /* key */
  if (key_len > ctx->block_size)
    {
      /* key is longer than block, calculate hash of key */
      clib_sha2_update (ctx, key, key_len);
      for (i = (ctx->digest_size / sizeof (uword)) / 2; i < n_words; i++)
	key_data[i] = 0;
      clib_sha2_final (ctx, (u8 *) key_data);
      clib_sha2_init (ctx, type);
    }
  else
    {
      for (i = 0; i < n_words; i++)
	key_data[i] = 0;
      clib_memcpy_fast (key_data, key, key_len);
    }

  /* ipad */
  for (i = 0; i < n_words; i++)
    ctx->pending.as_uword[i] = key_data[i] ^ (uword) 0x3636363636363636;
  if (ctx->block_size == SHA512_BLOCK_SIZE)
    clib_sha512_block (ctx, ctx->pending.as_u8, 1);
  else
    clib_sha256_block (ctx, ctx->pending.as_u8, 1);
  ctx->total_bytes += ctx->block_size;

  /* message */
  clib_sha2_update (ctx, msg, len);
  clib_sha2_final (ctx, i_digest);

  /* opad */
  clib_sha2_init (ctx, type);
  for (i = 0; i < n_words; i++)
    ctx->pending.as_uword[i] = key_data[i] ^ (uword) 0x5c5c5c5c5c5c5c5c;
  if (ctx->block_size == SHA512_BLOCK_SIZE)
    clib_sha512_block (ctx, ctx->pending.as_u8, 1);
  else
    clib_sha256_block (ctx, ctx->pending.as_u8, 1);
  ctx->total_bytes += ctx->block_size;

  /* digest */
  clib_sha2_update (ctx, i_digest, ctx->digest_size);
  clib_sha2_final (ctx, digest);
}

#define clib_hmac_sha224(...) clib_hmac_sha2 (CLIB_SHA2_224, __VA_ARGS__)
#define clib_hmac_sha256(...) clib_hmac_sha2 (CLIB_SHA2_256, __VA_ARGS__)
#define clib_hmac_sha384(...) clib_hmac_sha2 (CLIB_SHA2_384, __VA_ARGS__)
#define clib_hmac_sha512(...) clib_hmac_sha2 (CLIB_SHA2_512, __VA_ARGS__)
#define clib_hmac_sha512_224(...)                                             \
  clib_hmac_sha2 (CLIB_SHA2_512_224, __VA_ARGS__)
#define clib_hmac_sha512_256(...)                                             \
  clib_hmac_sha2 (CLIB_SHA2_512_256, __VA_ARGS__)

#endif /* included_sha2_h */