aboutsummaryrefslogtreecommitdiff
path: root/src/libcrypto.c
blob: 186d6105e35cd5cda3234dce51a400935354d2d4 (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
770
771
772
773
774
775
776
777
778
779
/*
 * This file is part of the SSH Library
 *
 * Copyright (c) 2009 by Aris Adamantiadis
 *
 * The SSH Library is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or (at your
 * option) any later version.
 *
 * The SSH Library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with the SSH Library; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA 02111-1307, USA.
 */

#include "config.h"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif

#include "libssh/priv.h"
#include "libssh/session.h"
#include "libssh/crypto.h"
#include "libssh/wrapper.h"
#include "libssh/libcrypto.h"

#ifdef HAVE_LIBCRYPTO

#include <openssl/sha.h>
#include <openssl/md5.h>
#include <openssl/dsa.h>
#include <openssl/rsa.h>
#include <openssl/hmac.h>
#include <openssl/opensslv.h>
#include <openssl/rand.h>
#include "libcrypto-compat.h"

#ifdef HAVE_OPENSSL_AES_H
#define HAS_AES
#include <openssl/aes.h>
#endif
#ifdef HAVE_OPENSSL_DES_H
#define HAS_DES
#include <openssl/des.h>
#endif

#if (OPENSSL_VERSION_NUMBER<0x00907000L)
#define OLD_CRYPTO
#endif

#include "libssh/crypto.h"

extern const struct ssh_cipher_struct chacha20poly1305_cipher;
struct ssh_mac_ctx_struct {
  enum ssh_mac_e mac_type;
  union {
    SHACTX sha1_ctx;
    SHA256CTX sha256_ctx;
    SHA384CTX sha384_ctx;
    SHA512CTX sha512_ctx;
  } ctx;
};

void ssh_reseed(void){
#ifndef _WIN32
    struct timeval tv;
    gettimeofday(&tv, NULL);
    RAND_add(&tv, sizeof(tv), 0.0);
#endif
}

SHACTX sha1_init(void)
{
    int rc;
    SHACTX c = EVP_MD_CTX_create();
    if (c == NULL) {
        return NULL;
    }
    EVP_MD_CTX_init(c);
    rc = EVP_DigestInit_ex(c, EVP_sha1(), NULL);
    if (rc == 0) {
        EVP_MD_CTX_destroy(c);
        c = NULL;
    }
    return c;
}

void sha1_update(SHACTX c, const void *data, unsigned long len)
{
    EVP_DigestUpdate(c, data, len);
}

void sha1_final(unsigned char *md, SHACTX c)
{
    unsigned int mdlen = 0;

    EVP_DigestFinal(c, md, &mdlen);
    EVP_MD_CTX_destroy(c);
}

void sha1(unsigned char *digest, int len, unsigned char *hash)
{
    SHACTX c = sha1_init();
    if (c != NULL) {
        sha1_update(c, digest, len);
        sha1_final(hash, c);
    }
}

#ifdef HAVE_OPENSSL_ECC
static const EVP_MD *nid_to_evpmd(int nid)
{
    switch (nid) {
        case NID_X9_62_prime256v1:
            return EVP_sha256();
        case NID_secp384r1:
            return EVP_sha384();
        case NID_secp521r1:
            return EVP_sha512();
        default:
            return NULL;
    }

    return NULL;
}

void evp(int nid, unsigned char *digest, int len, unsigned char *hash, unsigned int *hlen)
{
    const EVP_MD *evp_md = nid_to_evpmd(nid);
    EVP_MD_CTX *md = EVP_MD_CTX_new();

    EVP_DigestInit(md, evp_md);
    EVP_DigestUpdate(md, digest, len);
    EVP_DigestFinal(md, hash, hlen);
    EVP_MD_CTX_free(md);
}

EVPCTX evp_init(int nid)
{
    const EVP_MD *evp_md = nid_to_evpmd(nid);

    EVPCTX ctx = EVP_MD_CTX_new();
    if (ctx == NULL) {
        return NULL;
    }

    EVP_DigestInit(ctx, evp_md);

    return ctx;
}

void evp_update(EVPCTX ctx, const void *data, unsigned long len)
{
    EVP_DigestUpdate(ctx, data, len);
}

void evp_final(EVPCTX ctx, unsigned char *md, unsigned int *mdlen)
{
    EVP_DigestFinal(ctx, md, mdlen);
}
#endif

SHA256CTX sha256_init(void)
{
    int rc;
    SHA256CTX c = EVP_MD_CTX_create();
    if (c == NULL) {
        return NULL;
    }
    EVP_MD_CTX_init(c);
    rc = EVP_DigestInit_ex(c, EVP_sha256(), NULL);
    if (rc == 0) {
        EVP_MD_CTX_destroy(c);
        c = NULL;
    }
    return c;
}

void sha256_update(SHA256CTX c, const void *data, unsigned long len)
{
    EVP_DigestUpdate(c, data, len);
}

void sha256_final(unsigned char *md, SHA256CTX c)
{
    unsigned int mdlen = 0;

    EVP_DigestFinal(c, md, &mdlen);
    EVP_MD_CTX_destroy(c);
}

void sha256(unsigned char *digest, int len, unsigned char *hash)
{
    SHA256CTX c = sha256_init();
    if (c != NULL) {
        sha256_update(c, digest, len);
        sha256_final(hash, c);
    }
}

SHA384CTX sha384_init(void)
{
    int rc;
    SHA384CTX c = EVP_MD_CTX_create();
    if (c == NULL) {
        return NULL;
    }
    EVP_MD_CTX_init(c);
    rc = EVP_DigestInit_ex(c, EVP_sha384(), NULL);
    if (rc == 0) {
        EVP_MD_CTX_destroy(c);
        c = NULL;
    }
    return c;
}

void sha384_update(SHA384CTX c, const void *data, unsigned long len)
{
    EVP_DigestUpdate(c, data, len);
}

void sha384_final(unsigned char *md, SHA384CTX c)
{
    unsigned int mdlen = 0;

    EVP_DigestFinal(c, md, &mdlen);
    EVP_MD_CTX_destroy(c);
}

void sha384(unsigned char *digest, int len, unsigned char *hash)
{
    SHA384CTX c = sha384_init();
    if (c != NULL) {
        sha384_update(c, digest, len);
        sha384_final(hash, c);
    }
}

SHA512CTX sha512_init(void)
{
    int rc = 0;
    SHA512CTX c = EVP_MD_CTX_create();
    if (c == NULL) {
        return NULL;
    }
    EVP_MD_CTX_init(c);
    rc = EVP_DigestInit_ex(c, EVP_sha512(), NULL);
    if (rc == 0) {
        EVP_MD_CTX_destroy(c);
        c = NULL;
    }
    return c;
}

void sha512_update(SHA512CTX c, const void *data, unsigned long len)
{
    EVP_DigestUpdate(c, data, len);
}

void sha512_final(unsigned char *md, SHA512CTX c)
{
    unsigned int mdlen = 0;

    EVP_DigestFinal(c, md, &mdlen);
    EVP_MD_CTX_destroy(c);
}

void sha512(unsigned char *digest, int len, unsigned char *hash)
{
    SHA512CTX c = sha512_init();
    if (c != NULL) {
        sha512_update(c, digest, len);
        sha512_final(hash, c);
    }
}

MD5CTX md5_init(void)
{
    int rc;
    MD5CTX c = EVP_MD_CTX_create();
    if (c == NULL) {
        return NULL;
    }
    EVP_MD_CTX_init(c);
    rc = EVP_DigestInit_ex(c, EVP_md5(), NULL);
    if(rc == 0) {
        EVP_MD_CTX_destroy(c);
        c = NULL;
    }
    return c;
}

void md5_update(MD5CTX c, const void *data, unsigned long len)
{
    EVP_DigestUpdate(c, data, len);
}

void md5_final(unsigned char *md, MD5CTX c)
{
    unsigned int mdlen = 0;

    EVP_DigestFinal(c, md, &mdlen);
    EVP_MD_CTX_destroy(c);
}

ssh_mac_ctx ssh_mac_ctx_init(enum ssh_mac_e type){
  ssh_mac_ctx ctx = malloc(sizeof(struct ssh_mac_ctx_struct));
  if (ctx == NULL) {
    return NULL;
  }

  ctx->mac_type=type;
  switch(type){
    case SSH_MAC_SHA1:
      ctx->ctx.sha1_ctx = sha1_init();
      return ctx;
    case SSH_MAC_SHA256:
      ctx->ctx.sha256_ctx = sha256_init();
      return ctx;
    case SSH_MAC_SHA384:
      ctx->ctx.sha384_ctx = sha384_init();
      return ctx;
    case SSH_MAC_SHA512:
      ctx->ctx.sha512_ctx = sha512_init();
      return ctx;
    default:
      SAFE_FREE(ctx);
      return NULL;
  }
}

void ssh_mac_update(ssh_mac_ctx ctx, const void *data, unsigned long len) {
  switch(ctx->mac_type){
    case SSH_MAC_SHA1:
      sha1_update(ctx->ctx.sha1_ctx, data, len);
      break;
    case SSH_MAC_SHA256:
      sha256_update(ctx->ctx.sha256_ctx, data, len);
      break;
    case SSH_MAC_SHA384:
      sha384_update(ctx->ctx.sha384_ctx, data, len);
      break;
    case SSH_MAC_SHA512:
      sha512_update(ctx->ctx.sha512_ctx, data, len);
      break;
    default:
      break;
  }
}

void ssh_mac_final(unsigned char *md, ssh_mac_ctx ctx) {
  switch(ctx->mac_type){
    case SSH_MAC_SHA1:
      sha1_final(md,ctx->ctx.sha1_ctx);
      break;
    case SSH_MAC_SHA256:
      sha256_final(md,ctx->ctx.sha256_ctx);
      break;
    case SSH_MAC_SHA384:
      sha384_final(md,ctx->ctx.sha384_ctx);
      break;
    case SSH_MAC_SHA512:
      sha512_final(md,ctx->ctx.sha512_ctx);
      break;
    default:
      break;
  }
  SAFE_FREE(ctx);
}

HMACCTX hmac_init(const void *key, int len, enum ssh_hmac_e type) {
  HMACCTX ctx = NULL;

  ctx = HMAC_CTX_new();
  if (ctx == NULL) {
    return NULL;
  }

#ifndef OLD_CRYPTO
  HMAC_CTX_reset(ctx); // openssl 0.9.7 requires it.
#endif

  switch(type) {
    case SSH_HMAC_SHA1:
      HMAC_Init_ex(ctx, key, len, EVP_sha1(), NULL);
      break;
    case SSH_HMAC_SHA256:
      HMAC_Init_ex(ctx, key, len, EVP_sha256(), NULL);
      break;
    case SSH_HMAC_SHA384:
      HMAC_Init_ex(ctx, key, len, EVP_sha384(), NULL);
      break;
    case SSH_HMAC_SHA512:
      HMAC_Init_ex(ctx, key, len, EVP_sha512(), NULL);
      break;
    case SSH_HMAC_MD5:
      HMAC_Init_ex(ctx, key, len, EVP_md5(), NULL);
      break;
    default:
      HMAC_CTX_free(ctx);
      SAFE_FREE(ctx);
      ctx = NULL;
  }

  return ctx;
}

void hmac_update(HMACCTX ctx, const void *data, unsigned long len) {
  HMAC_Update(ctx, data, len);
}

void hmac_final(HMACCTX ctx, unsigned char *hashmacbuf, unsigned int *len) {
  HMAC_Final(ctx,hashmacbuf,len);

#ifndef OLD_CRYPTO
  HMAC_CTX_free(ctx);
  ctx = NULL;
#else
  HMAC_cleanup(ctx);
#endif

  SAFE_FREE(ctx);
}

static void evp_cipher_init(struct ssh_cipher_struct *cipher) {
    if (cipher->ctx == NULL) {
        cipher->ctx = EVP_CIPHER_CTX_new();
    }

    switch(cipher->ciphertype){
    case SSH_AES128_CBC:
        cipher->cipher = EVP_aes_128_cbc();
        break;
    case SSH_AES192_CBC:
        cipher->cipher = EVP_aes_192_cbc();
        break;
    case SSH_AES256_CBC:
        cipher->cipher = EVP_aes_256_cbc();
        break;
#ifdef HAVE_OPENSSL_EVP_AES_CTR
    case SSH_AES128_CTR:
        cipher->cipher = EVP_aes_128_ctr();
        break;
    case SSH_AES192_CTR:
        cipher->cipher = EVP_aes_192_ctr();
        break;
    case SSH_AES256_CTR:
        cipher->cipher = EVP_aes_256_ctr();
        break;
#else
    case SSH_AES128_CTR:
    case SSH_AES192_CTR:
    case SSH_AES256_CTR:
        SSH_LOG(SSH_LOG_WARNING, "This cipher is not available in evp_cipher_init");
        break;
#endif
    case SSH_3DES_CBC:
        cipher->cipher = EVP_des_ede3_cbc();
        break;
    case SSH_BLOWFISH_CBC:
        cipher->cipher = EVP_bf_cbc();
        break;
        /* ciphers not using EVP */
    case SSH_NO_CIPHER:
        SSH_LOG(SSH_LOG_WARNING, "No valid ciphertype found");
        break;
    }
}

static int evp_cipher_set_encrypt_key(struct ssh_cipher_struct *cipher,
            void *key, void *IV)
{
    int rc;

    evp_cipher_init(cipher);
    EVP_CIPHER_CTX_init(cipher->ctx);

    rc = EVP_EncryptInit_ex(cipher->ctx, cipher->cipher, NULL, key, IV);
    if (rc != 1){
        SSH_LOG(SSH_LOG_WARNING, "EVP_EncryptInit_ex failed");
        return SSH_ERROR;
    }
    EVP_CIPHER_CTX_set_padding(cipher->ctx, 0);

    return SSH_OK;
}

static int evp_cipher_set_decrypt_key(struct ssh_cipher_struct *cipher,
            void *key, void *IV) {
    int rc;

    evp_cipher_init(cipher);
    EVP_CIPHER_CTX_init(cipher->ctx);

    rc = EVP_DecryptInit_ex(cipher->ctx, cipher->cipher, NULL, key, IV);
    if (rc != 1){
        SSH_LOG(SSH_LOG_WARNING, "EVP_DecryptInit_ex failed");
        return SSH_ERROR;
    }
    EVP_CIPHER_CTX_set_padding(cipher->ctx, 0);

    return SSH_OK;
}

/* EVP wrapper function for encrypt/decrypt */
static void evp_cipher_encrypt(struct ssh_cipher_struct *cipher,
                        void *in,
                        void *out,
                        unsigned long len) {
    int outlen = 0;
    int rc = 0;

    rc = EVP_EncryptUpdate(cipher->ctx, (unsigned char *)out, &outlen, (unsigned char *)in, len);
    if (rc != 1){
        SSH_LOG(SSH_LOG_WARNING, "EVP_EncryptUpdate failed");
        return;
    }
    if (outlen != (int)len){
        SSH_LOG(SSH_LOG_WARNING, "EVP_EncryptUpdate: output size %d for %zu in", outlen, len);
        return;
    }
}

static void evp_cipher_decrypt(struct ssh_cipher_struct *cipher,
                        void *in,
                        void *out,
                        unsigned long len) {
    int outlen = 0;
    int rc = 0;

    rc = EVP_DecryptUpdate(cipher->ctx, (unsigned char *)out, &outlen, (unsigned char *)in, len);
    if (rc != 1){
        SSH_LOG(SSH_LOG_WARNING, "EVP_DecryptUpdate failed");
        return;
    }
    if (outlen != (int)len){
        SSH_LOG(SSH_LOG_WARNING, "EVP_DecryptUpdate: output size %d for %zu in", outlen, len);
        return;
    }
}

static void evp_cipher_cleanup(struct ssh_cipher_struct *cipher) {
    if (cipher->ctx != NULL) {
        EVP_CIPHER_CTX_cleanup(cipher->ctx);
        EVP_CIPHER_CTX_free(cipher->ctx);
    }
}

#ifndef HAVE_OPENSSL_EVP_AES_CTR
/* Some OS (osx, OpenIndiana, ...) have no support for CTR ciphers in EVP_aes */

struct ssh_aes_key_schedule {
    AES_KEY key;
    uint8_t IV[AES_BLOCK_SIZE];
};

static int aes_ctr_set_key(struct ssh_cipher_struct *cipher, void *key,
    void *IV) {
    int rc;

    if (cipher->aes_key == NULL) {
        cipher->aes_key = malloc(sizeof (struct ssh_aes_key_schedule));
    }
    if (cipher->aes_key == NULL) {
        return SSH_ERROR;
    }
    ZERO_STRUCTP(cipher->aes_key);
    /* CTR doesn't need a decryption key */
    rc = AES_set_encrypt_key(key, cipher->keysize, &cipher->aes_key->key);
    if (rc < 0) {
        SAFE_FREE(cipher->aes_key);
        return SSH_ERROR;
    }
    memcpy(cipher->aes_key->IV, IV, AES_BLOCK_SIZE);
    return SSH_OK;
}

static void aes_ctr_encrypt(struct ssh_cipher_struct *cipher, void *in, void *out,
    unsigned long len) {
  unsigned char tmp_buffer[AES_BLOCK_SIZE];
  unsigned int num=0;
  /* Some things are special with ctr128 :
   * In this case, tmp_buffer is not being used, because it is used to store temporary data
   * when an encryption is made on lengths that are not multiple of blocksize.
   * Same for num, which is being used to store the current offset in blocksize in CTR
   * function.
   */
#ifdef HAVE_OPENSSL_CRYPTO_CTR128_ENCRYPT
  CRYPTO_ctr128_encrypt(in, out, len, &cipher->aes_key->key, cipher->aes_key->IV, tmp_buffer, &num, (block128_f)AES_encrypt);
#else
  AES_ctr128_encrypt(in, out, len, &cipher->aes_key->key, cipher->aes_key->IV, tmp_buffer, &num);
#endif /* HAVE_OPENSSL_CRYPTO_CTR128_ENCRYPT */
}

static void aes_ctr_cleanup(struct ssh_cipher_struct *cipher){
    explicit_bzero(cipher->aes_key, sizeof(*cipher->aes_key));
    SAFE_FREE(cipher->aes_key);
}

#endif /* HAVE_OPENSSL_EVP_AES_CTR */

/*
 * The table of supported ciphers
 */
static struct ssh_cipher_struct ssh_ciphertab[] = {
  {
    .name = "blowfish-cbc",
    .blocksize = 8,
    .ciphertype = SSH_BLOWFISH_CBC,
    .keysize = 128,
    .set_encrypt_key = evp_cipher_set_encrypt_key,
    .set_decrypt_key = evp_cipher_set_decrypt_key,
    .encrypt = evp_cipher_encrypt,
    .decrypt = evp_cipher_decrypt,
    .cleanup = evp_cipher_cleanup
  },
#ifdef HAS_AES
#ifndef BROKEN_AES_CTR
/* OpenSSL until 0.9.7c has a broken AES_ctr128_encrypt implementation which
 * increments the counter from 2^64 instead of 1. It's better not to use it
 */
#ifdef HAVE_OPENSSL_EVP_AES_CTR
  {
    .name = "aes128-ctr",
    .blocksize = 16,
    .ciphertype = SSH_AES128_CTR,
    .keysize = 128,
    .set_encrypt_key = evp_cipher_set_encrypt_key,
    .set_decrypt_key = evp_cipher_set_decrypt_key,
    .encrypt = evp_cipher_encrypt,
    .decrypt = evp_cipher_decrypt,
    .cleanup = evp_cipher_cleanup
  },
  {
    .name = "aes192-ctr",
    .blocksize = 16,
    .ciphertype = SSH_AES192_CTR,
    .keysize = 192,
    .set_encrypt_key = evp_cipher_set_encrypt_key,
    .set_decrypt_key = evp_cipher_set_decrypt_key,
    .encrypt = evp_cipher_encrypt,
    .decrypt = evp_cipher_decrypt,
    .cleanup = evp_cipher_cleanup
  },
  {
    .name = "aes256-ctr",
    .blocksize = 16,
    .ciphertype = SSH_AES256_CTR,
    .keysize = 256,
    .set_encrypt_key = evp_cipher_set_encrypt_key,
    .set_decrypt_key = evp_cipher_set_decrypt_key,
    .encrypt = evp_cipher_encrypt,
    .decrypt = evp_cipher_decrypt,
    .cleanup = evp_cipher_cleanup
  },
#else /* HAVE_OPENSSL_EVP_AES_CTR */
  {
    .name = "aes128-ctr",
    .blocksize = 16,
    .ciphertype = SSH_AES128_CTR,
    .keysize = 128,
    .set_encrypt_key = aes_ctr_set_key,
    .set_decrypt_key = aes_ctr_set_key,
    .encrypt = aes_ctr_encrypt,
    .decrypt = aes_ctr_encrypt,
    .cleanup = aes_ctr_cleanup
  },
  {
    .name = "aes192-ctr",
    .blocksize = 16,
    .ciphertype = SSH_AES192_CTR,
    .keysize = 192,
    .set_encrypt_key = aes_ctr_set_key,
    .set_decrypt_key = aes_ctr_set_key,
    .encrypt = aes_ctr_encrypt,
    .decrypt = aes_ctr_encrypt,
    .cleanup = aes_ctr_cleanup
  },
  {
    .name = "aes256-ctr",
    .blocksize = 16,
    .ciphertype = SSH_AES256_CTR,
    .keysize = 256,
    .set_encrypt_key = aes_ctr_set_key,
    .set_decrypt_key = aes_ctr_set_key,
    .encrypt = aes_ctr_encrypt,
    .decrypt = aes_ctr_encrypt,
    .cleanup = aes_ctr_cleanup
  },
#endif /* HAVE_OPENSSL_EVP_AES_CTR */
#endif /* BROKEN_AES_CTR */
  {
    .name = "aes128-cbc",
    .blocksize = 16,
    .ciphertype = SSH_AES128_CBC,
    .keysize = 128,
    .set_encrypt_key = evp_cipher_set_encrypt_key,
    .set_decrypt_key = evp_cipher_set_decrypt_key,
    .encrypt = evp_cipher_encrypt,
    .decrypt = evp_cipher_decrypt,
    .cleanup = evp_cipher_cleanup
  },
  {
    .name = "aes192-cbc",
    .blocksize = 16,
    .ciphertype = SSH_AES192_CBC,
    .keysize = 192,
    .set_encrypt_key = evp_cipher_set_encrypt_key,
    .set_decrypt_key = evp_cipher_set_decrypt_key,
    .encrypt = evp_cipher_encrypt,
    .decrypt = evp_cipher_decrypt,
    .cleanup = evp_cipher_cleanup
  },
  {
    .name = "aes256-cbc",
    .blocksize = 16,
    .ciphertype = SSH_AES256_CBC,
    .keysize = 256,
    .set_encrypt_key = evp_cipher_set_encrypt_key,
    .set_decrypt_key = evp_cipher_set_decrypt_key,
    .encrypt = evp_cipher_encrypt,
    .decrypt = evp_cipher_decrypt,
    .cleanup = evp_cipher_cleanup
  },
#endif /* HAS_AES */
#ifdef HAS_DES
  {
    .name = "3des-cbc",
    .blocksize = 8,
    .ciphertype = SSH_3DES_CBC,
    .keysize = 192,
    .set_encrypt_key = evp_cipher_set_encrypt_key,
    .set_decrypt_key = evp_cipher_set_decrypt_key,
    .encrypt = evp_cipher_encrypt,
    .decrypt = evp_cipher_decrypt,
    .cleanup = evp_cipher_cleanup
  },
#endif /* HAS_DES */
  {
    .name = "chacha20-poly1305@openssh.com"
  },
  {
    .name = NULL
  }
};

void libcrypto_init(void)
{
    size_t i;

    for (i = 0; ssh_ciphertab[i].name != NULL; i++) {
        int cmp;

        cmp = strcmp(ssh_ciphertab[i].name, "chacha20-poly1305@openssh.com");
        if (cmp == 0) {
            memcpy(&ssh_ciphertab[i],
                   &chacha20poly1305_cipher,
                   sizeof(struct ssh_cipher_struct));
            break;
        }
    }
}

struct ssh_cipher_struct *ssh_get_ciphertab(void)
{
  return ssh_ciphertab;
}

#endif /* LIBCRYPTO */