summaryrefslogtreecommitdiffstats
path: root/src/plugins/quic/quic_crypto.c
blob: b644bed3e7573752fceb02a3a6a399fd50127310 (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
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
/*
 * 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.
 */
#include <vnet/crypto/crypto.h>
#include <vppinfra/lock.h>

#include <quic/quic.h>
#include <quic/quic_crypto.h>

#include <quicly.h>
#include <picotls/openssl.h>

#define QUICLY_EPOCH_1RTT 3

extern quic_main_t quic_main;
extern quic_ctx_t *quic_get_conn_ctx (quicly_conn_t * conn);

typedef void (*quicly_do_transform_fn) (ptls_cipher_context_t *, void *,
					const void *, size_t);

struct cipher_context_t
{
  ptls_cipher_context_t super;
  vnet_crypto_op_t op;
  u32 key_index;
};

struct aead_crypto_context_t
{
  ptls_aead_context_t super;
  vnet_crypto_op_t op;
  u32 key_index;
};

static size_t
quic_crypto_offload_aead_decrypt (quic_ctx_t * qctx,
				  ptls_aead_context_t * _ctx, void *_output,
				  const void *input, size_t inlen,
				  uint64_t decrypted_pn, const void *aad,
				  size_t aadlen);

vnet_crypto_main_t *cm = &crypto_main;

void
quic_crypto_batch_tx_packets (quic_crypto_batch_ctx_t * batch_ctx)
{
  vlib_main_t *vm = vlib_get_main ();

  if (batch_ctx->nb_tx_packets <= 0)
    return;

  clib_rwlock_reader_lock (&quic_main.crypto_keys_quic_rw_lock);
  vnet_crypto_process_ops (vm, batch_ctx->aead_crypto_tx_packets_ops,
			   batch_ctx->nb_tx_packets);
  clib_rwlock_reader_unlock (&quic_main.crypto_keys_quic_rw_lock);

  for (int i = 0; i < batch_ctx->nb_tx_packets; i++)
    clib_mem_free (batch_ctx->aead_crypto_tx_packets_ops[i].iv);

  batch_ctx->nb_tx_packets = 0;
}

void
quic_crypto_batch_rx_packets (quic_crypto_batch_ctx_t * batch_ctx)
{
  vlib_main_t *vm = vlib_get_main ();

  if (batch_ctx->nb_rx_packets <= 0)
    return;

  clib_rwlock_reader_lock (&quic_main.crypto_keys_quic_rw_lock);
  vnet_crypto_process_ops (vm, batch_ctx->aead_crypto_rx_packets_ops,
			   batch_ctx->nb_rx_packets);
  clib_rwlock_reader_unlock (&quic_main.crypto_keys_quic_rw_lock);

  for (int i = 0; i < batch_ctx->nb_rx_packets; i++)
    clib_mem_free (batch_ctx->aead_crypto_rx_packets_ops[i].iv);

  batch_ctx->nb_rx_packets = 0;
}

void
build_iv (ptls_aead_context_t * ctx, uint8_t * iv, uint64_t seq)
{
  size_t iv_size = ctx->algo->iv_size, i;
  const uint8_t *s = ctx->static_iv;
  uint8_t *d = iv;
  /* build iv */
  for (i = iv_size - 8; i != 0; --i)
    *d++ = *s++;
  i = 64;
  do
    {
      i -= 8;
      *d++ = *s++ ^ (uint8_t) (seq >> i);
    }
  while (i != 0);
}

static void
do_finalize_send_packet (ptls_cipher_context_t * hp,
			 quicly_datagram_t * packet,
			 size_t first_byte_at, size_t payload_from)
{
  uint8_t hpmask[1 + QUICLY_SEND_PN_SIZE] = {
    0
  };
  size_t i;

  ptls_cipher_init (hp,
		    packet->data.base + payload_from - QUICLY_SEND_PN_SIZE +
		    QUICLY_MAX_PN_SIZE);
  ptls_cipher_encrypt (hp, hpmask, hpmask, sizeof (hpmask));

  packet->data.base[first_byte_at] ^=
    hpmask[0] &
    (QUICLY_PACKET_IS_LONG_HEADER (packet->data.base[first_byte_at]) ? 0xf :
     0x1f);

  for (i = 0; i != QUICLY_SEND_PN_SIZE; ++i)
    packet->data.base[payload_from + i - QUICLY_SEND_PN_SIZE] ^=
      hpmask[i + 1];
}

void
quic_crypto_finalize_send_packet (quicly_datagram_t * packet)
{
  quic_encrypt_cb_ctx *encrypt_cb_ctx =
    (quic_encrypt_cb_ctx *) ((uint8_t *) packet + sizeof (*packet));

  for (int i = 0; i < encrypt_cb_ctx->snd_ctx_count; i++)
    {
      do_finalize_send_packet (encrypt_cb_ctx->snd_ctx[i].hp,
			       packet,
			       encrypt_cb_ctx->snd_ctx[i].first_byte_at,
			       encrypt_cb_ctx->snd_ctx[i].payload_from);
    }
  encrypt_cb_ctx->snd_ctx_count = 0;
}

static int
quic_crypto_setup_cipher (quicly_crypto_engine_t * engine,
			  quicly_conn_t * conn, size_t epoch, int is_enc,
			  ptls_cipher_context_t ** hp_ctx,
			  ptls_aead_context_t ** aead_ctx,
			  ptls_aead_algorithm_t * aead,
			  ptls_hash_algorithm_t * hash, const void *secret)
{
  uint8_t hpkey[PTLS_MAX_SECRET_SIZE];
  int ret;

  if (hp_ctx != NULL)
    *hp_ctx = NULL;
  *aead_ctx = NULL;

  /* generate new header protection key */
  if (hp_ctx != NULL)
    {
      if ((ret =
	   ptls_hkdf_expand_label (hash, hpkey, aead->ctr_cipher->key_size,
				   ptls_iovec_init (secret,
						    hash->digest_size),
				   "quic hp", ptls_iovec_init (NULL, 0),
				   NULL)) != 0)
	goto Exit;
      if ((*hp_ctx =
	   ptls_cipher_new (aead->ctr_cipher, is_enc, hpkey)) == NULL)
	{
	  ret = PTLS_ERROR_NO_MEMORY;
	  goto Exit;
	}
    }

  /* generate new AEAD context */
  if ((*aead_ctx =
       ptls_aead_new (aead, hash, is_enc, secret,
		      QUICLY_AEAD_BASE_LABEL)) == NULL)
    {
      ret = PTLS_ERROR_NO_MEMORY;
      goto Exit;
    }

  if (epoch == QUICLY_EPOCH_1RTT && !is_enc)
    {
      quic_ctx_t *qctx = quic_get_conn_ctx (conn);
      if (qctx->ingress_keys.aead_ctx != NULL)
	{
	  qctx->key_phase_ingress++;
	}

      qctx->ingress_keys.aead_ctx = *aead_ctx;
      if (hp_ctx != NULL)
	qctx->ingress_keys.hp_ctx = *hp_ctx;
    }

  ret = 0;

Exit:
  if (ret != 0)
    {
      if (*aead_ctx != NULL)
	{
	  ptls_aead_free (*aead_ctx);
	  *aead_ctx = NULL;
	}
      if (*hp_ctx != NULL)
	{
	  ptls_cipher_free (*hp_ctx);
	  *hp_ctx = NULL;
	}
    }
  ptls_clear_memory (hpkey, sizeof (hpkey));
  return ret;
}

void
quic_crypto_finalize_send_packet_cb (struct st_quicly_crypto_engine_t
				     *engine, quicly_conn_t * conn,
				     ptls_cipher_context_t * hp,
				     ptls_aead_context_t * aead,
				     quicly_datagram_t * packet,
				     size_t first_byte_at,
				     size_t payload_from, int coalesced)
{
  quic_encrypt_cb_ctx *encrypt_cb_ctx =
    (quic_encrypt_cb_ctx *) ((uint8_t *) packet + sizeof (*packet));

  encrypt_cb_ctx->snd_ctx[encrypt_cb_ctx->snd_ctx_count].hp = hp;
  encrypt_cb_ctx->snd_ctx[encrypt_cb_ctx->snd_ctx_count].first_byte_at =
    first_byte_at;
  encrypt_cb_ctx->snd_ctx[encrypt_cb_ctx->snd_ctx_count].payload_from =
    payload_from;
  encrypt_cb_ctx->snd_ctx_count++;
}

void
quic_crypto_decrypt_packet (quic_ctx_t * qctx, quic_rx_packet_ctx_t * pctx)
{
  ptls_cipher_context_t *header_protection = NULL;
  ptls_aead_context_t *aead = NULL;
  int pn;

  /* Long Header packets are not decrypted by vpp */
  if (QUICLY_PACKET_IS_LONG_HEADER (pctx->packet.octets.base[0]))
    return;

  uint64_t next_expected_packet_number =
    quicly_get_next_expected_packet_number (qctx->conn);
  if (next_expected_packet_number == UINT64_MAX)
    return;

  aead = qctx->ingress_keys.aead_ctx;
  header_protection = qctx->ingress_keys.hp_ctx;

  if (!aead || !header_protection)
    return;

  size_t encrypted_len = pctx->packet.octets.len - pctx->packet.encrypted_off;
  uint8_t hpmask[5] = { 0 };
  uint32_t pnbits = 0;
  size_t pnlen, ptlen, i;

  /* decipher the header protection, as well as obtaining pnbits, pnlen */
  if (encrypted_len < header_protection->algo->iv_size + QUICLY_MAX_PN_SIZE)
    return;
  ptls_cipher_init (header_protection,
		    pctx->packet.octets.base + pctx->packet.encrypted_off +
		    QUICLY_MAX_PN_SIZE);
  ptls_cipher_encrypt (header_protection, hpmask, hpmask, sizeof (hpmask));
  pctx->packet.octets.base[0] ^=
    hpmask[0] & (QUICLY_PACKET_IS_LONG_HEADER (pctx->packet.octets.base[0]) ?
		 0xf : 0x1f);
  pnlen = (pctx->packet.octets.base[0] & 0x3) + 1;
  for (i = 0; i != pnlen; ++i)
    {
      pctx->packet.octets.base[pctx->packet.encrypted_off + i] ^=
	hpmask[i + 1];
      pnbits =
	(pnbits << 8) | pctx->packet.octets.base[pctx->packet.encrypted_off +
						 i];
    }

  size_t aead_off = pctx->packet.encrypted_off + pnlen;

  pn =
    quicly_determine_packet_number (pnbits, pnlen * 8,
				    next_expected_packet_number);

  int key_phase_bit =
    (pctx->packet.octets.base[0] & QUICLY_KEY_PHASE_BIT) != 0;

  if (key_phase_bit != (qctx->key_phase_ingress & 1))
    {
      pctx->packet.octets.base[0] ^=
	hpmask[0] &
	(QUICLY_PACKET_IS_LONG_HEADER (pctx->packet.octets.base[0]) ? 0xf :
	 0x1f);
      for (i = 0; i != pnlen; ++i)
	{
	  pctx->packet.octets.base[pctx->packet.encrypted_off + i] ^=
	    hpmask[i + 1];
	}
      return;
    }

  if ((ptlen =
       quic_crypto_offload_aead_decrypt (qctx, aead,
					 pctx->packet.octets.base + aead_off,
					 pctx->packet.octets.base + aead_off,
					 pctx->packet.octets.len - aead_off,
					 pn, pctx->packet.octets.base,
					 aead_off)) == SIZE_MAX)
    {
      fprintf (stderr,
	       "%s: aead decryption failure (pn: %d)\n", __FUNCTION__, pn);
      return;
    }

  pctx->packet.encrypted_off = aead_off;
  pctx->packet.octets.len = ptlen + aead_off;

  pctx->packet.decrypted.pn = pn;
  pctx->packet.decrypted.key_phase = qctx->key_phase_ingress;
}

#ifdef QUIC_HP_CRYPTO
static void
quic_crypto_cipher_do_init (ptls_cipher_context_t * _ctx, const void *iv)
{
  struct cipher_context_t *ctx = (struct cipher_context_t *) _ctx;
  vnet_crypto_op_id_t id;
  if (!strcmp (ctx->super.algo->name, "AES128-CTR"))
    {
      id = VNET_CRYPTO_OP_AES_128_CTR_ENC;
    }
  else if (!strcmp (ctx->super.algo->name, "AES256-CTR"))
    {
      id = VNET_CRYPTO_OP_AES_256_CTR_ENC;
    }
  else
    {
      QUIC_DBG (1, "%s, Invalid crypto cipher : ", __FUNCTION__,
		_ctx->algo->name);
      assert (0);
    }
  vnet_crypto_op_init (&ctx->op, id);
  ctx->op.iv = (u8 *) iv;
  ctx->op.key_index = ctx->key_index;
}

static void
quic_crypto_cipher_dispose (ptls_cipher_context_t * _ctx)
{
  /* Do nothing */
}

static void
quic_crypto_cipher_encrypt (ptls_cipher_context_t * _ctx, void *output,
			    const void *input, size_t _len)
{
  vlib_main_t *vm = vlib_get_main ();
  struct cipher_context_t *ctx = (struct cipher_context_t *) _ctx;

  ctx->op.src = (u8 *) input;
  ctx->op.dst = output;
  ctx->op.len = _len;

  vnet_crypto_process_ops (vm, &ctx->op, 1);
}

static int
quic_crypto_cipher_setup_crypto (ptls_cipher_context_t * _ctx, int is_enc,
				 const void *key, const EVP_CIPHER * cipher,
				 quicly_do_transform_fn do_transform)
{
  struct cipher_context_t *ctx = (struct cipher_context_t *) _ctx;

  ctx->super.do_dispose = quic_crypto_cipher_dispose;
  ctx->super.do_init = quic_crypto_cipher_do_init;
  ctx->super.do_transform = do_transform;

  vlib_main_t *vm = vlib_get_main ();
  vnet_crypto_alg_t algo;
  if (!strcmp (ctx->super.algo->name, "AES128-CTR"))
    {
      algo = VNET_CRYPTO_ALG_AES_128_CTR;
    }
  else if (!strcmp (ctx->super.algo->name, "AES256-CTR"))
    {
      algo = VNET_CRYPTO_ALG_AES_256_CTR;
    }
  else
    {
      QUIC_DBG (1, "%s, Invalid crypto cipher : ", __FUNCTION__,
		_ctx->algo->name);
      assert (0);
    }

  ctx->key_index = vnet_crypto_key_add (vm, algo,
					(u8 *) key, _ctx->algo->key_size);

  return 0;
}

static int
quic_crypto_aes128ctr_setup_crypto (ptls_cipher_context_t * ctx, int is_enc,
				    const void *key)
{
  return quic_crypto_cipher_setup_crypto (ctx, 1, key, EVP_aes_128_ctr (),
					  quic_crypto_cipher_encrypt);
}

static int
quic_crypto_aes256ctr_setup_crypto (ptls_cipher_context_t * ctx, int is_enc,
				    const void *key)
{
  return quic_crypto_cipher_setup_crypto (ctx, 1, key, EVP_aes_256_ctr (),
					  quic_crypto_cipher_encrypt);
}

#endif // QUIC_HP_CRYPTO

void
quic_crypto_aead_encrypt_init (ptls_aead_context_t * _ctx, const void *iv,
			       const void *aad, size_t aadlen)
{
  quic_main_t *qm = &quic_main;
  u32 thread_index = vlib_get_thread_index ();

  struct aead_crypto_context_t *ctx = (struct aead_crypto_context_t *) _ctx;

  vnet_crypto_op_id_t id;
  if (!strcmp (ctx->super.algo->name, "AES128-GCM"))
    {
      id = VNET_CRYPTO_OP_AES_128_GCM_ENC;
    }
  else if (!strcmp (ctx->super.algo->name, "AES256-GCM"))
    {
      id = VNET_CRYPTO_OP_AES_256_GCM_ENC;
    }
  else
    {
      assert (0);
    }

  quic_crypto_batch_ctx_t *quic_crypto_batch_ctx =
    &qm->wrk_ctx[thread_index].crypto_context_batch;

  vnet_crypto_op_t *vnet_op =
    &quic_crypto_batch_ctx->aead_crypto_tx_packets_ops
    [quic_crypto_batch_ctx->nb_tx_packets];
  vnet_crypto_op_init (vnet_op, id);
  vnet_op->aad = (u8 *) aad;
  vnet_op->aad_len = aadlen;
  vnet_op->iv = clib_mem_alloc (PTLS_MAX_IV_SIZE);
  clib_memcpy (vnet_op->iv, iv, PTLS_MAX_IV_SIZE);
  vnet_op->key_index = ctx->key_index;
}

size_t
quic_crypto_aead_encrypt_update (ptls_aead_context_t * _ctx, void *output,
				 const void *input, size_t inlen)
{
  struct aead_crypto_context_t *ctx = (struct aead_crypto_context_t *) _ctx;

  quic_main_t *qm = &quic_main;
  u32 thread_index = vlib_get_thread_index ();
  quic_crypto_batch_ctx_t *quic_crypto_batch_ctx =
    &qm->wrk_ctx[thread_index].crypto_context_batch;

  vnet_crypto_op_t *vnet_op =
    &quic_crypto_batch_ctx->aead_crypto_tx_packets_ops
    [quic_crypto_batch_ctx->nb_tx_packets];
  vnet_op->src = (u8 *) input;
  vnet_op->dst = output;
  vnet_op->len = inlen;
  vnet_op->tag_len = ctx->super.algo->tag_size;

  vnet_op->tag = vnet_op->src + inlen;

  return 0;
}

size_t
quic_crypto_aead_encrypt_final (ptls_aead_context_t * _ctx, void *output)
{
  quic_main_t *qm = &quic_main;
  u32 thread_index = vlib_get_thread_index ();
  quic_crypto_batch_ctx_t *quic_crypto_batch_ctx =
    &qm->wrk_ctx[thread_index].crypto_context_batch;

  vnet_crypto_op_t *vnet_op =
    &quic_crypto_batch_ctx->
    aead_crypto_tx_packets_ops[quic_crypto_batch_ctx->nb_tx_packets];
  quic_crypto_batch_ctx->nb_tx_packets++;
  return vnet_op->len + vnet_op->tag_len;
}

size_t
quic_crypto_aead_decrypt (ptls_aead_context_t * _ctx, void *_output,
			  const void *input, size_t inlen, const void *iv,
			  const void *aad, size_t aadlen)
{
  vlib_main_t *vm = vlib_get_main ();
  struct aead_crypto_context_t *ctx = (struct aead_crypto_context_t *) _ctx;

  vnet_crypto_op_id_t id;
  if (!strcmp (ctx->super.algo->name, "AES128-GCM"))
    {
      id = VNET_CRYPTO_OP_AES_128_GCM_DEC;
    }
  else if (!strcmp (ctx->super.algo->name, "AES256-GCM"))
    {
      id = VNET_CRYPTO_OP_AES_256_GCM_DEC;
    }
  else
    {
      assert (0);
    }

  vnet_crypto_op_init (&ctx->op, id);
  ctx->op.aad = (u8 *) aad;
  ctx->op.aad_len = aadlen;
  ctx->op.iv = (u8 *) iv;

  ctx->op.src = (u8 *) input;
  ctx->op.dst = _output;
  ctx->op.key_index = ctx->key_index;
  ctx->op.len = inlen - ctx->super.algo->tag_size;

  ctx->op.tag_len = ctx->super.algo->tag_size;
  ctx->op.tag = ctx->op.src + ctx->op.len;

  vnet_crypto_process_ops (vm, &ctx->op, 1);

  if (ctx->op.status != VNET_CRYPTO_OP_STATUS_COMPLETED)
    return SIZE_MAX;

  return ctx->op.len;
}

static size_t
quic_crypto_offload_aead_decrypt (quic_ctx_t * qctx,
				  ptls_aead_context_t * _ctx, void *_output,
				  const void *input, size_t inlen,
				  uint64_t decrypted_pn, const void *aad,
				  size_t aadlen)
{
  struct aead_crypto_context_t *ctx = (struct aead_crypto_context_t *) _ctx;
  vnet_crypto_op_id_t id;
  if (!strcmp (ctx->super.algo->name, "AES128-GCM"))
    {
      id = VNET_CRYPTO_OP_AES_128_GCM_DEC;
    }
  else if (!strcmp (ctx->super.algo->name, "AES256-GCM"))
    {
      id = VNET_CRYPTO_OP_AES_256_GCM_DEC;
    }
  else
    {
      return SIZE_MAX;
    }

  quic_main_t *qm = &quic_main;
  quic_crypto_batch_ctx_t *quic_crypto_batch_ctx =
    &qm->wrk_ctx[qctx->c_thread_index].crypto_context_batch;

  vnet_crypto_op_t *vnet_op =
    &quic_crypto_batch_ctx->aead_crypto_rx_packets_ops
    [quic_crypto_batch_ctx->nb_rx_packets];

  vnet_crypto_op_init (vnet_op, id);
  vnet_op->aad = (u8 *) aad;
  vnet_op->aad_len = aadlen;
  vnet_op->iv = clib_mem_alloc (PTLS_MAX_IV_SIZE);
  build_iv (_ctx, vnet_op->iv, decrypted_pn);
  vnet_op->src = (u8 *) input;
  vnet_op->dst = _output;
  vnet_op->key_index = ctx->key_index;
  vnet_op->len = inlen - ctx->super.algo->tag_size;
  vnet_op->tag_len = ctx->super.algo->tag_size;
  vnet_op->tag = vnet_op->src + vnet_op->len;
  quic_crypto_batch_ctx->nb_rx_packets++;
  return vnet_op->len;
}

static void
quic_crypto_aead_dispose_crypto (ptls_aead_context_t * _ctx)
{

}

static int
quic_crypto_aead_setup_crypto (ptls_aead_context_t * _ctx, int is_enc,
			       const void *key, const EVP_CIPHER * cipher)
{
  vlib_main_t *vm = vlib_get_main ();
  struct aead_crypto_context_t *ctx = (struct aead_crypto_context_t *) _ctx;

  vnet_crypto_alg_t algo;
  if (!strcmp (ctx->super.algo->name, "AES128-GCM"))
    {
      algo = VNET_CRYPTO_ALG_AES_128_GCM;
    }
  else if (!strcmp (ctx->super.algo->name, "AES256-GCM"))
    {
      algo = VNET_CRYPTO_ALG_AES_256_GCM;
    }
  else
    {
      QUIC_DBG (1, "%s, invalied aead cipher %s", __FUNCTION__,
		_ctx->algo->name);
      assert (0);
    }

  ctx->super.do_decrypt = quic_crypto_aead_decrypt;

  ctx->super.do_encrypt_init = quic_crypto_aead_encrypt_init;
  ctx->super.do_encrypt_update = quic_crypto_aead_encrypt_update;
  ctx->super.do_encrypt_final = quic_crypto_aead_encrypt_final;
  ctx->super.dispose_crypto = quic_crypto_aead_dispose_crypto;

  clib_rwlock_writer_lock (&quic_main.crypto_keys_quic_rw_lock);
  ctx->key_index = vnet_crypto_key_add (vm, algo,
					(u8 *) key, _ctx->algo->key_size);
  clib_rwlock_writer_unlock (&quic_main.crypto_keys_quic_rw_lock);

  return 0;
}

static int
quic_crypto_aead_aes128gcm_setup_crypto (ptls_aead_context_t * ctx,
					 int is_enc, const void *key)
{
  return quic_crypto_aead_setup_crypto (ctx, is_enc, key, EVP_aes_128_gcm ());
}

static int
quic_crypto_aead_aes256gcm_setup_crypto (ptls_aead_context_t * ctx,
					 int is_enc, const void *key)
{
  return quic_crypto_aead_setup_crypto (ctx, is_enc, key, EVP_aes_256_gcm ());
}

#ifdef QUIC_HP_CRYPTO
ptls_cipher_algorithm_t quic_crypto_aes128ctr = {
  "AES128-CTR",
  PTLS_AES128_KEY_SIZE,
  1, PTLS_AES_IV_SIZE,
  sizeof (struct cipher_context_t), aes128ctr_setup_crypto
};

ptls_cipher_algorithm_t quic_crypto_aes256ctr = {
  "AES256-CTR", PTLS_AES256_KEY_SIZE, 1 /* block size */ ,
  PTLS_AES_IV_SIZE, sizeof (struct cipher_context_t), aes256ctr_setup_crypto
};
#endif

ptls_aead_algorithm_t quic_crypto_aes128gcm = {
  "AES128-GCM",
#ifdef QUIC_HP_CRYPTO
  &quic_crypto_aes128ctr,
#else
  &ptls_openssl_aes128ctr,
#endif
  &ptls_openssl_aes128ecb,
  PTLS_AES128_KEY_SIZE,
  PTLS_AESGCM_IV_SIZE,
  PTLS_AESGCM_TAG_SIZE,
  sizeof (struct aead_crypto_context_t),
  quic_crypto_aead_aes128gcm_setup_crypto
};

ptls_aead_algorithm_t quic_crypto_aes256gcm = {
  "AES256-GCM",
#ifdef QUIC_HP_CRYPTO
  &quic_crypto_aes256ctr,
#else
  &ptls_openssl_aes256ctr,
#endif
  &ptls_openssl_aes256ecb,
  PTLS_AES256_KEY_SIZE,
  PTLS_AESGCM_IV_SIZE,
  PTLS_AESGCM_TAG_SIZE,
  sizeof (struct aead_crypto_context_t),
  quic_crypto_aead_aes256gcm_setup_crypto
};

ptls_cipher_suite_t quic_crypto_aes128gcmsha256 = {
  PTLS_CIPHER_SUITE_AES_128_GCM_SHA256,
  &quic_crypto_aes128gcm, &ptls_openssl_sha256
};

ptls_cipher_suite_t quic_crypto_aes256gcmsha384 = {
  PTLS_CIPHER_SUITE_AES_256_GCM_SHA384,
  &quic_crypto_aes256gcm, &ptls_openssl_sha384
};

ptls_cipher_suite_t *quic_crypto_cipher_suites[] = {
  &quic_crypto_aes256gcmsha384, &quic_crypto_aes128gcmsha256, NULL
};

quicly_crypto_engine_t quic_crypto_engine = {
  quic_crypto_setup_cipher, quic_crypto_finalize_send_packet_cb
};

int
quic_encrypt_ticket_cb (ptls_encrypt_ticket_t * _self, ptls_t * tls,
			int is_encrypt, ptls_buffer_t * dst, ptls_iovec_t src)
{
  quic_session_cache_t *self = (void *) _self;
  int ret;

  if (is_encrypt)
    {

      /* replace the cached entry along with a newly generated session id */
      clib_mem_free (self->data.base);
      if ((self->data.base = clib_mem_alloc (src.len)) == NULL)
	return PTLS_ERROR_NO_MEMORY;

      ptls_get_context (tls)->random_bytes (self->id, sizeof (self->id));
      clib_memcpy (self->data.base, src.base, src.len);
      self->data.len = src.len;

      /* store the session id in buffer */
      if ((ret = ptls_buffer_reserve (dst, sizeof (self->id))) != 0)
	return ret;
      clib_memcpy (dst->base + dst->off, self->id, sizeof (self->id));
      dst->off += sizeof (self->id);

    }
  else
    {

      /* check if session id is the one stored in cache */
      if (src.len != sizeof (self->id))
	return PTLS_ERROR_SESSION_NOT_FOUND;
      if (clib_memcmp (self->id, src.base, sizeof (self->id)) != 0)
	return PTLS_ERROR_SESSION_NOT_FOUND;

      /* return the cached value */
      if ((ret = ptls_buffer_reserve (dst, self->data.len)) != 0)
	return ret;
      clib_memcpy (dst->base + dst->off, self->data.base, self->data.len);
      dst->off += self->data.len;
    }

  return 0;
}

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */