1 /*
2 * Copyright (c) 2002 Bob Beck <beck@openbsd.org>
3 * Copyright (c) 2002 Theo de Raadt
4 * Copyright (c) 2002 Markus Friedl
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY
20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
23 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 *
27 */
28
29 #include <openssl/objects.h>
30 #include <openssl/engine.h>
31 #include <openssl/evp.h>
32 #include <openssl/bn.h>
33
34 #if (defined(__unix__) || defined(unix)) && !defined(USG) && \
35 (defined(OpenBSD) || defined(__FreeBSD_version))
36 #include <sys/param.h>
37 # if (OpenBSD >= 200112) || ((__FreeBSD_version >= 470101 && __FreeBSD_version < 500000) || __FreeBSD_version >= 500041)
38 # define HAVE_CRYPTODEV
39 # endif
40 # if (OpenBSD >= 200110)
41 # define HAVE_SYSLOG_R
42 # endif
43 #endif
44
45 #ifndef HAVE_CRYPTODEV
46
47 void
ENGINE_load_cryptodev(void)48 ENGINE_load_cryptodev(void)
49 {
50 /* This is a NOP on platforms without /dev/crypto */
51 return;
52 }
53
54 #else
55
56 #include <sys/types.h>
57 #include <crypto/cryptodev.h>
58 #include <sys/ioctl.h>
59 #include <errno.h>
60 #include <stdio.h>
61 #include <unistd.h>
62 #include <fcntl.h>
63 #include <stdarg.h>
64 #include <syslog.h>
65 #include <errno.h>
66 #include <string.h>
67
68 struct dev_crypto_state {
69 struct session_op d_sess;
70 int d_fd;
71 };
72
73 static u_int32_t cryptodev_asymfeat = 0;
74
75 static int get_asym_dev_crypto(void);
76 static int open_dev_crypto(void);
77 static int get_dev_crypto(void);
78 static int cryptodev_max_iv(int cipher);
79 static int cryptodev_key_length_valid(int cipher, int len);
80 static int cipher_nid_to_cryptodev(int nid);
81 static int get_cryptodev_ciphers(const int **cnids);
82 static int get_cryptodev_digests(const int **cnids);
83 static int cryptodev_usable_ciphers(const int **nids);
84 static int cryptodev_usable_digests(const int **nids);
85 static int cryptodev_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
86 const unsigned char *in, unsigned int inl);
87 static int cryptodev_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
88 const unsigned char *iv, int enc);
89 static int cryptodev_cleanup(EVP_CIPHER_CTX *ctx);
90 static int cryptodev_engine_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
91 const int **nids, int nid);
92 static int cryptodev_engine_digests(ENGINE *e, const EVP_MD **digest,
93 const int **nids, int nid);
94 static int bn2crparam(const BIGNUM *a, struct crparam *crp);
95 static int crparam2bn(struct crparam *crp, BIGNUM *a);
96 static void zapparams(struct crypt_kop *kop);
97 static int cryptodev_asym(struct crypt_kop *kop, int rlen, BIGNUM *r,
98 int slen, BIGNUM *s);
99
100 static int cryptodev_bn_mod_exp(BIGNUM *r, const BIGNUM *a,
101 const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
102 static int cryptodev_rsa_nocrt_mod_exp(BIGNUM *r0, const BIGNUM *I,
103 RSA *rsa);
104 static int cryptodev_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx);
105 static int cryptodev_dsa_bn_mod_exp(DSA *dsa, BIGNUM *r, BIGNUM *a,
106 const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
107 static int cryptodev_dsa_dsa_mod_exp(DSA *dsa, BIGNUM *t1, BIGNUM *g,
108 BIGNUM *u1, BIGNUM *pub_key, BIGNUM *u2, BIGNUM *p,
109 BN_CTX *ctx, BN_MONT_CTX *mont);
110 static DSA_SIG *cryptodev_dsa_do_sign(const unsigned char *dgst,
111 int dlen, DSA *dsa);
112 static int cryptodev_dsa_verify(const unsigned char *dgst, int dgst_len,
113 DSA_SIG *sig, DSA *dsa);
114 static int cryptodev_mod_exp_dh(const DH *dh, BIGNUM *r, const BIGNUM *a,
115 const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx,
116 BN_MONT_CTX *m_ctx);
117 static int cryptodev_dh_compute_key(unsigned char *key,
118 const BIGNUM *pub_key, DH *dh);
119 static int cryptodev_ctrl(ENGINE *e, int cmd, long i, void *p,
120 void (*f)());
121 void ENGINE_load_cryptodev(void);
122
123 static const ENGINE_CMD_DEFN cryptodev_defns[] = {
124 { 0, NULL, NULL, 0 }
125 };
126
127 static struct {
128 int id;
129 int nid;
130 int ivmax;
131 int keylen;
132 } ciphers[] = {
133 { CRYPTO_DES_CBC, NID_des_cbc, 8, 8, },
134 { CRYPTO_3DES_CBC, NID_des_ede3_cbc, 8, 24, },
135 { CRYPTO_AES_CBC, NID_aes_128_cbc, 16, 16, },
136 { CRYPTO_BLF_CBC, NID_bf_cbc, 8, 16, },
137 { CRYPTO_CAST_CBC, NID_cast5_cbc, 8, 16, },
138 { CRYPTO_SKIPJACK_CBC, NID_undef, 0, 0, },
139 { 0, NID_undef, 0, 0, },
140 };
141
142 static struct {
143 int id;
144 int nid;
145 } digests[] = {
146 { CRYPTO_SHA1_HMAC, NID_hmacWithSHA1, },
147 { CRYPTO_RIPEMD160_HMAC, NID_ripemd160, },
148 { CRYPTO_MD5_KPDK, NID_undef, },
149 { CRYPTO_SHA1_KPDK, NID_undef, },
150 { CRYPTO_MD5, NID_md5, },
151 { CRYPTO_SHA1, NID_undef, },
152 { 0, NID_undef, },
153 };
154
155 /*
156 * Return a fd if /dev/crypto seems usable, 0 otherwise.
157 */
158 static int
open_dev_crypto(void)159 open_dev_crypto(void)
160 {
161 static int fd = -1;
162
163 if (fd == -1) {
164 if ((fd = open("/dev/crypto", O_RDWR, 0)) == -1)
165 return (-1);
166 /* close on exec */
167 if (fcntl(fd, F_SETFD, 1) == -1) {
168 close(fd);
169 fd = -1;
170 return (-1);
171 }
172 }
173 return (fd);
174 }
175
176 static int
get_dev_crypto(void)177 get_dev_crypto(void)
178 {
179 int fd, retfd;
180
181 if ((fd = open_dev_crypto()) == -1)
182 return (-1);
183 if (ioctl(fd, CRIOGET, &retfd) == -1)
184 return (-1);
185
186 /* close on exec */
187 if (fcntl(retfd, F_SETFD, 1) == -1) {
188 close(retfd);
189 return (-1);
190 }
191 return (retfd);
192 }
193
194 /* Caching version for asym operations */
195 static int
get_asym_dev_crypto(void)196 get_asym_dev_crypto(void)
197 {
198 static int fd = -1;
199
200 if (fd == -1)
201 fd = get_dev_crypto();
202 return fd;
203 }
204
205 /*
206 * XXXX this needs to be set for each alg - and determined from
207 * a running card.
208 */
209 static int
cryptodev_max_iv(int cipher)210 cryptodev_max_iv(int cipher)
211 {
212 int i;
213
214 for (i = 0; ciphers[i].id; i++)
215 if (ciphers[i].id == cipher)
216 return (ciphers[i].ivmax);
217 return (0);
218 }
219
220 /*
221 * XXXX this needs to be set for each alg - and determined from
222 * a running card. For now, fake it out - but most of these
223 * for real devices should return 1 for the supported key
224 * sizes the device can handle.
225 */
226 static int
cryptodev_key_length_valid(int cipher,int len)227 cryptodev_key_length_valid(int cipher, int len)
228 {
229 int i;
230
231 for (i = 0; ciphers[i].id; i++)
232 if (ciphers[i].id == cipher)
233 return (ciphers[i].keylen == len);
234 return (0);
235 }
236
237 /* convert libcrypto nids to cryptodev */
238 static int
cipher_nid_to_cryptodev(int nid)239 cipher_nid_to_cryptodev(int nid)
240 {
241 int i;
242
243 for (i = 0; ciphers[i].id; i++)
244 if (ciphers[i].nid == nid)
245 return (ciphers[i].id);
246 return (0);
247 }
248
249 /*
250 * Find out what ciphers /dev/crypto will let us have a session for.
251 * XXX note, that some of these openssl doesn't deal with yet!
252 * returning them here is harmless, as long as we return NULL
253 * when asked for a handler in the cryptodev_engine_ciphers routine
254 */
255 static int
get_cryptodev_ciphers(const int ** cnids)256 get_cryptodev_ciphers(const int **cnids)
257 {
258 static int nids[CRYPTO_ALGORITHM_MAX];
259 struct session_op sess;
260 int fd, i, count = 0;
261
262 if ((fd = get_dev_crypto()) < 0) {
263 *cnids = NULL;
264 return (0);
265 }
266 memset(&sess, 0, sizeof(sess));
267 sess.key = (caddr_t)"123456781234567812345678";
268
269 for (i = 0; ciphers[i].id && count < CRYPTO_ALGORITHM_MAX; i++) {
270 if (ciphers[i].nid == NID_undef)
271 continue;
272 sess.cipher = ciphers[i].id;
273 sess.keylen = ciphers[i].keylen;
274 sess.mac = 0;
275 if (ioctl(fd, CIOCGSESSION, &sess) != -1 &&
276 ioctl(fd, CIOCFSESSION, &sess.ses) != -1)
277 nids[count++] = ciphers[i].nid;
278 }
279 close(fd);
280
281 if (count > 0)
282 *cnids = nids;
283 else
284 *cnids = NULL;
285 return (count);
286 }
287
288 /*
289 * Find out what digests /dev/crypto will let us have a session for.
290 * XXX note, that some of these openssl doesn't deal with yet!
291 * returning them here is harmless, as long as we return NULL
292 * when asked for a handler in the cryptodev_engine_digests routine
293 */
294 static int
get_cryptodev_digests(const int ** cnids)295 get_cryptodev_digests(const int **cnids)
296 {
297 static int nids[CRYPTO_ALGORITHM_MAX];
298 struct session_op sess;
299 int fd, i, count = 0;
300
301 if ((fd = get_dev_crypto()) < 0) {
302 *cnids = NULL;
303 return (0);
304 }
305 memset(&sess, 0, sizeof(sess));
306 for (i = 0; digests[i].id && count < CRYPTO_ALGORITHM_MAX; i++) {
307 if (digests[i].nid == NID_undef)
308 continue;
309 sess.mac = digests[i].id;
310 sess.cipher = 0;
311 if (ioctl(fd, CIOCGSESSION, &sess) != -1 &&
312 ioctl(fd, CIOCFSESSION, &sess.ses) != -1)
313 nids[count++] = digests[i].nid;
314 }
315 close(fd);
316
317 if (count > 0)
318 *cnids = nids;
319 else
320 *cnids = NULL;
321 return (count);
322 }
323
324 /*
325 * Find the useable ciphers|digests from dev/crypto - this is the first
326 * thing called by the engine init crud which determines what it
327 * can use for ciphers from this engine. We want to return
328 * only what we can do, anythine else is handled by software.
329 *
330 * If we can't initialize the device to do anything useful for
331 * any reason, we want to return a NULL array, and 0 length,
332 * which forces everything to be done is software. By putting
333 * the initalization of the device in here, we ensure we can
334 * use this engine as the default, and if for whatever reason
335 * /dev/crypto won't do what we want it will just be done in
336 * software
337 *
338 * This can (should) be greatly expanded to perhaps take into
339 * account speed of the device, and what we want to do.
340 * (although the disabling of particular alg's could be controlled
341 * by the device driver with sysctl's.) - this is where we
342 * want most of the decisions made about what we actually want
343 * to use from /dev/crypto.
344 */
345 static int
cryptodev_usable_ciphers(const int ** nids)346 cryptodev_usable_ciphers(const int **nids)
347 {
348 return (get_cryptodev_ciphers(nids));
349 }
350
351 static int
cryptodev_usable_digests(const int ** nids)352 cryptodev_usable_digests(const int **nids)
353 {
354 /*
355 * XXXX just disable all digests for now, because it sucks.
356 * we need a better way to decide this - i.e. I may not
357 * want digests on slow cards like hifn on fast machines,
358 * but might want them on slow or loaded machines, etc.
359 * will also want them when using crypto cards that don't
360 * suck moose gonads - would be nice to be able to decide something
361 * as reasonable default without having hackery that's card dependent.
362 * of course, the default should probably be just do everything,
363 * with perhaps a sysctl to turn algoritms off (or have them off
364 * by default) on cards that generally suck like the hifn.
365 */
366 *nids = NULL;
367 return (0);
368 }
369
370 static int
cryptodev_cipher(EVP_CIPHER_CTX * ctx,unsigned char * out,const unsigned char * in,unsigned int inl)371 cryptodev_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
372 const unsigned char *in, unsigned int inl)
373 {
374 struct crypt_op cryp;
375 struct dev_crypto_state *state = ctx->cipher_data;
376 struct session_op *sess = &state->d_sess;
377 void *iiv;
378 unsigned char save_iv[EVP_MAX_IV_LENGTH];
379
380 if (state->d_fd < 0)
381 return (0);
382 if (!inl)
383 return (1);
384 if ((inl % ctx->cipher->block_size) != 0)
385 return (0);
386
387 memset(&cryp, 0, sizeof(cryp));
388
389 cryp.ses = sess->ses;
390 cryp.flags = 0;
391 cryp.len = inl;
392 cryp.src = (caddr_t) in;
393 cryp.dst = (caddr_t) out;
394 cryp.mac = 0;
395
396 cryp.op = ctx->encrypt ? COP_ENCRYPT : COP_DECRYPT;
397
398 if (ctx->cipher->iv_len) {
399 cryp.iv = (caddr_t) ctx->iv;
400 if (!ctx->encrypt) {
401 iiv = (void *) in + inl - ctx->cipher->iv_len;
402 memcpy(save_iv, iiv, ctx->cipher->iv_len);
403 }
404 } else
405 cryp.iv = NULL;
406
407 if (ioctl(state->d_fd, CIOCCRYPT, &cryp) == -1) {
408 /* XXX need better errror handling
409 * this can fail for a number of different reasons.
410 */
411 return (0);
412 }
413
414 if (ctx->cipher->iv_len) {
415 if (ctx->encrypt)
416 iiv = (void *) out + inl - ctx->cipher->iv_len;
417 else
418 iiv = save_iv;
419 memcpy(ctx->iv, iiv, ctx->cipher->iv_len);
420 }
421 return (1);
422 }
423
424 static int
cryptodev_init_key(EVP_CIPHER_CTX * ctx,const unsigned char * key,const unsigned char * iv,int enc)425 cryptodev_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
426 const unsigned char *iv, int enc)
427 {
428 struct dev_crypto_state *state = ctx->cipher_data;
429 struct session_op *sess = &state->d_sess;
430 int cipher;
431
432 if ((cipher = cipher_nid_to_cryptodev(ctx->cipher->nid)) == NID_undef)
433 return (0);
434
435 if (ctx->cipher->iv_len > cryptodev_max_iv(cipher))
436 return (0);
437
438 if (!cryptodev_key_length_valid(cipher, ctx->key_len))
439 return (0);
440
441 memset(sess, 0, sizeof(struct session_op));
442
443 if ((state->d_fd = get_dev_crypto()) < 0)
444 return (0);
445
446 sess->key = (unsigned char *)key;
447 sess->keylen = ctx->key_len;
448 sess->cipher = cipher;
449
450 if (ioctl(state->d_fd, CIOCGSESSION, sess) == -1) {
451 close(state->d_fd);
452 state->d_fd = -1;
453 return (0);
454 }
455 return (1);
456 }
457
458 /*
459 * free anything we allocated earlier when initting a
460 * session, and close the session.
461 */
462 static int
cryptodev_cleanup(EVP_CIPHER_CTX * ctx)463 cryptodev_cleanup(EVP_CIPHER_CTX *ctx)
464 {
465 int ret = 0;
466 struct dev_crypto_state *state = ctx->cipher_data;
467 struct session_op *sess = &state->d_sess;
468
469 if (state->d_fd < 0)
470 return (0);
471
472 /* XXX if this ioctl fails, someting's wrong. the invoker
473 * may have called us with a bogus ctx, or we could
474 * have a device that for whatever reason just doesn't
475 * want to play ball - it's not clear what's right
476 * here - should this be an error? should it just
477 * increase a counter, hmm. For right now, we return
478 * 0 - I don't believe that to be "right". we could
479 * call the gorpy openssl lib error handlers that
480 * print messages to users of the library. hmm..
481 */
482
483 if (ioctl(state->d_fd, CIOCFSESSION, &sess->ses) == -1) {
484 ret = 0;
485 } else {
486 ret = 1;
487 }
488 close(state->d_fd);
489 state->d_fd = -1;
490
491 return (ret);
492 }
493
494 /*
495 * libcrypto EVP stuff - this is how we get wired to EVP so the engine
496 * gets called when libcrypto requests a cipher NID.
497 */
498
499 /* DES CBC EVP */
500 const EVP_CIPHER cryptodev_des_cbc = {
501 NID_des_cbc,
502 8, 8, 8,
503 EVP_CIPH_CBC_MODE,
504 cryptodev_init_key,
505 cryptodev_cipher,
506 cryptodev_cleanup,
507 sizeof(struct dev_crypto_state),
508 EVP_CIPHER_set_asn1_iv,
509 EVP_CIPHER_get_asn1_iv,
510 NULL
511 };
512
513 /* 3DES CBC EVP */
514 const EVP_CIPHER cryptodev_3des_cbc = {
515 NID_des_ede3_cbc,
516 8, 24, 8,
517 EVP_CIPH_CBC_MODE,
518 cryptodev_init_key,
519 cryptodev_cipher,
520 cryptodev_cleanup,
521 sizeof(struct dev_crypto_state),
522 EVP_CIPHER_set_asn1_iv,
523 EVP_CIPHER_get_asn1_iv,
524 NULL
525 };
526
527 const EVP_CIPHER cryptodev_bf_cbc = {
528 NID_bf_cbc,
529 8, 16, 8,
530 EVP_CIPH_CBC_MODE,
531 cryptodev_init_key,
532 cryptodev_cipher,
533 cryptodev_cleanup,
534 sizeof(struct dev_crypto_state),
535 EVP_CIPHER_set_asn1_iv,
536 EVP_CIPHER_get_asn1_iv,
537 NULL
538 };
539
540 const EVP_CIPHER cryptodev_cast_cbc = {
541 NID_cast5_cbc,
542 8, 16, 8,
543 EVP_CIPH_CBC_MODE,
544 cryptodev_init_key,
545 cryptodev_cipher,
546 cryptodev_cleanup,
547 sizeof(struct dev_crypto_state),
548 EVP_CIPHER_set_asn1_iv,
549 EVP_CIPHER_get_asn1_iv,
550 NULL
551 };
552
553 const EVP_CIPHER cryptodev_aes_cbc = {
554 NID_aes_128_cbc,
555 16, 16, 16,
556 EVP_CIPH_CBC_MODE,
557 cryptodev_init_key,
558 cryptodev_cipher,
559 cryptodev_cleanup,
560 sizeof(struct dev_crypto_state),
561 EVP_CIPHER_set_asn1_iv,
562 EVP_CIPHER_get_asn1_iv,
563 NULL
564 };
565
566 /*
567 * Registered by the ENGINE when used to find out how to deal with
568 * a particular NID in the ENGINE. this says what we'll do at the
569 * top level - note, that list is restricted by what we answer with
570 */
571 static int
cryptodev_engine_ciphers(ENGINE * e,const EVP_CIPHER ** cipher,const int ** nids,int nid)572 cryptodev_engine_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
573 const int **nids, int nid)
574 {
575 if (!cipher)
576 return (cryptodev_usable_ciphers(nids));
577
578 switch (nid) {
579 case NID_des_ede3_cbc:
580 *cipher = &cryptodev_3des_cbc;
581 break;
582 case NID_des_cbc:
583 *cipher = &cryptodev_des_cbc;
584 break;
585 case NID_bf_cbc:
586 *cipher = &cryptodev_bf_cbc;
587 break;
588 case NID_cast5_cbc:
589 *cipher = &cryptodev_cast_cbc;
590 break;
591 case NID_aes_128_cbc:
592 *cipher = &cryptodev_aes_cbc;
593 break;
594 default:
595 *cipher = NULL;
596 break;
597 }
598 return (*cipher != NULL);
599 }
600
601 static int
cryptodev_engine_digests(ENGINE * e,const EVP_MD ** digest,const int ** nids,int nid)602 cryptodev_engine_digests(ENGINE *e, const EVP_MD **digest,
603 const int **nids, int nid)
604 {
605 if (!digest)
606 return (cryptodev_usable_digests(nids));
607
608 switch (nid) {
609 case NID_md5:
610 *digest = NULL; /* need to make a clean md5 critter */
611 break;
612 default:
613 *digest = NULL;
614 break;
615 }
616 return (*digest != NULL);
617 }
618
619 /*
620 * Convert a BIGNUM to the representation that /dev/crypto needs.
621 * Upon completion of use, the caller is responsible for freeing
622 * crp->crp_p.
623 */
624 static int
bn2crparam(const BIGNUM * a,struct crparam * crp)625 bn2crparam(const BIGNUM *a, struct crparam *crp)
626 {
627 int i, j, k;
628 ssize_t words, bytes, bits;
629 u_char *b;
630
631 crp->crp_p = NULL;
632 crp->crp_nbits = 0;
633
634 bits = BN_num_bits(a);
635 bytes = (bits + 7) / 8;
636
637 b = malloc(bytes);
638 if (b == NULL)
639 return (1);
640
641 crp->crp_p = b;
642 crp->crp_nbits = bits;
643
644 for (i = 0, j = 0; i < a->top; i++) {
645 for (k = 0; k < BN_BITS2 / 8; k++) {
646 if ((j + k) >= bytes)
647 return (0);
648 b[j + k] = a->d[i] >> (k * 8);
649 }
650 j += BN_BITS2 / 8;
651 }
652 return (0);
653 }
654
655 /* Convert a /dev/crypto parameter to a BIGNUM */
656 static int
crparam2bn(struct crparam * crp,BIGNUM * a)657 crparam2bn(struct crparam *crp, BIGNUM *a)
658 {
659 u_int8_t *pd;
660 int i, bytes;
661
662 bytes = (crp->crp_nbits + 7) / 8;
663
664 if (bytes == 0)
665 return (-1);
666
667 if ((pd = (u_int8_t *) malloc(bytes)) == NULL)
668 return (-1);
669
670 for (i = 0; i < bytes; i++)
671 pd[i] = crp->crp_p[bytes - i - 1];
672
673 BN_bin2bn(pd, bytes, a);
674 free(pd);
675
676 return (0);
677 }
678
679 static void
zapparams(struct crypt_kop * kop)680 zapparams(struct crypt_kop *kop)
681 {
682 int i;
683
684 for (i = 0; i <= kop->crk_iparams + kop->crk_oparams; i++) {
685 if (kop->crk_param[i].crp_p)
686 free(kop->crk_param[i].crp_p);
687 kop->crk_param[i].crp_p = NULL;
688 kop->crk_param[i].crp_nbits = 0;
689 }
690 }
691
692 static int
cryptodev_asym(struct crypt_kop * kop,int rlen,BIGNUM * r,int slen,BIGNUM * s)693 cryptodev_asym(struct crypt_kop *kop, int rlen, BIGNUM *r, int slen, BIGNUM *s)
694 {
695 int fd, ret = -1;
696
697 if ((fd = get_asym_dev_crypto()) < 0)
698 return (ret);
699
700 if (r) {
701 kop->crk_param[kop->crk_iparams].crp_p = calloc(rlen, sizeof(char));
702 kop->crk_param[kop->crk_iparams].crp_nbits = rlen * 8;
703 kop->crk_oparams++;
704 }
705 if (s) {
706 kop->crk_param[kop->crk_iparams+1].crp_p = calloc(slen, sizeof(char));
707 kop->crk_param[kop->crk_iparams+1].crp_nbits = slen * 8;
708 kop->crk_oparams++;
709 }
710
711 if (ioctl(fd, CIOCKEY, kop) == 0) {
712 if (r)
713 crparam2bn(&kop->crk_param[kop->crk_iparams], r);
714 if (s)
715 crparam2bn(&kop->crk_param[kop->crk_iparams+1], s);
716 ret = 0;
717 }
718
719 return (ret);
720 }
721
722 static int
cryptodev_bn_mod_exp(BIGNUM * r,const BIGNUM * a,const BIGNUM * p,const BIGNUM * m,BN_CTX * ctx,BN_MONT_CTX * in_mont)723 cryptodev_bn_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
724 const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *in_mont)
725 {
726 struct crypt_kop kop;
727 int ret = 1;
728
729 /* Currently, we know we can do mod exp iff we can do any
730 * asymmetric operations at all.
731 */
732 if (cryptodev_asymfeat == 0) {
733 ret = BN_mod_exp(r, a, p, m, ctx);
734 return (ret);
735 }
736
737 memset(&kop, 0, sizeof kop);
738 kop.crk_op = CRK_MOD_EXP;
739
740 /* inputs: a^p % m */
741 if (bn2crparam(a, &kop.crk_param[0]))
742 goto err;
743 if (bn2crparam(p, &kop.crk_param[1]))
744 goto err;
745 if (bn2crparam(m, &kop.crk_param[2]))
746 goto err;
747 kop.crk_iparams = 3;
748
749 if (cryptodev_asym(&kop, BN_num_bytes(m), r, 0, NULL) == -1) {
750 const RSA_METHOD *meth = RSA_PKCS1_SSLeay();
751 ret = meth->bn_mod_exp(r, a, p, m, ctx, in_mont);
752 }
753 err:
754 zapparams(&kop);
755 return (ret);
756 }
757
758 static int
cryptodev_rsa_nocrt_mod_exp(BIGNUM * r0,const BIGNUM * I,RSA * rsa)759 cryptodev_rsa_nocrt_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa)
760 {
761 int r;
762 BN_CTX *ctx;
763
764 ctx = BN_CTX_new();
765 r = cryptodev_bn_mod_exp(r0, I, rsa->d, rsa->n, ctx, NULL);
766 BN_CTX_free(ctx);
767 return (r);
768 }
769
770 static int
cryptodev_rsa_mod_exp(BIGNUM * r0,const BIGNUM * I,RSA * rsa,BN_CTX * ctx)771 cryptodev_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx)
772 {
773 struct crypt_kop kop;
774 int ret = 1;
775
776 if (!rsa->p || !rsa->q || !rsa->dmp1 || !rsa->dmq1 || !rsa->iqmp) {
777 /* XXX 0 means failure?? */
778 return (0);
779 }
780
781 memset(&kop, 0, sizeof kop);
782 kop.crk_op = CRK_MOD_EXP_CRT;
783 /* inputs: rsa->p rsa->q I rsa->dmp1 rsa->dmq1 rsa->iqmp */
784 if (bn2crparam(rsa->p, &kop.crk_param[0]))
785 goto err;
786 if (bn2crparam(rsa->q, &kop.crk_param[1]))
787 goto err;
788 if (bn2crparam(I, &kop.crk_param[2]))
789 goto err;
790 if (bn2crparam(rsa->dmp1, &kop.crk_param[3]))
791 goto err;
792 if (bn2crparam(rsa->dmq1, &kop.crk_param[4]))
793 goto err;
794 if (bn2crparam(rsa->iqmp, &kop.crk_param[5]))
795 goto err;
796 kop.crk_iparams = 6;
797
798 if (cryptodev_asym(&kop, BN_num_bytes(rsa->n), r0, 0, NULL) == -1) {
799 const RSA_METHOD *meth = RSA_PKCS1_SSLeay();
800 ret = (*meth->rsa_mod_exp)(r0, I, rsa, ctx);
801 }
802 err:
803 zapparams(&kop);
804 return (ret);
805 }
806
807 static RSA_METHOD cryptodev_rsa = {
808 "cryptodev RSA method",
809 NULL, /* rsa_pub_enc */
810 NULL, /* rsa_pub_dec */
811 NULL, /* rsa_priv_enc */
812 NULL, /* rsa_priv_dec */
813 NULL,
814 NULL,
815 NULL, /* init */
816 NULL, /* finish */
817 0, /* flags */
818 NULL, /* app_data */
819 NULL, /* rsa_sign */
820 NULL /* rsa_verify */
821 };
822
823 static int
cryptodev_dsa_bn_mod_exp(DSA * dsa,BIGNUM * r,BIGNUM * a,const BIGNUM * p,const BIGNUM * m,BN_CTX * ctx,BN_MONT_CTX * m_ctx)824 cryptodev_dsa_bn_mod_exp(DSA *dsa, BIGNUM *r, BIGNUM *a, const BIGNUM *p,
825 const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx)
826 {
827 return (cryptodev_bn_mod_exp(r, a, p, m, ctx, m_ctx));
828 }
829
830 static int
cryptodev_dsa_dsa_mod_exp(DSA * dsa,BIGNUM * t1,BIGNUM * g,BIGNUM * u1,BIGNUM * pub_key,BIGNUM * u2,BIGNUM * p,BN_CTX * ctx,BN_MONT_CTX * mont)831 cryptodev_dsa_dsa_mod_exp(DSA *dsa, BIGNUM *t1, BIGNUM *g,
832 BIGNUM *u1, BIGNUM *pub_key, BIGNUM *u2, BIGNUM *p,
833 BN_CTX *ctx, BN_MONT_CTX *mont)
834 {
835 BIGNUM t2;
836 int ret = 0;
837
838 BN_init(&t2);
839
840 /* v = ( g^u1 * y^u2 mod p ) mod q */
841 /* let t1 = g ^ u1 mod p */
842 ret = 0;
843
844 if (!dsa->meth->bn_mod_exp(dsa,t1,dsa->g,u1,dsa->p,ctx,mont))
845 goto err;
846
847 /* let t2 = y ^ u2 mod p */
848 if (!dsa->meth->bn_mod_exp(dsa,&t2,dsa->pub_key,u2,dsa->p,ctx,mont))
849 goto err;
850 /* let u1 = t1 * t2 mod p */
851 if (!BN_mod_mul(u1,t1,&t2,dsa->p,ctx))
852 goto err;
853
854 BN_copy(t1,u1);
855
856 ret = 1;
857 err:
858 BN_free(&t2);
859 return(ret);
860 }
861
862 static DSA_SIG *
cryptodev_dsa_do_sign(const unsigned char * dgst,int dlen,DSA * dsa)863 cryptodev_dsa_do_sign(const unsigned char *dgst, int dlen, DSA *dsa)
864 {
865 struct crypt_kop kop;
866 BIGNUM *r = NULL, *s = NULL;
867 DSA_SIG *dsaret = NULL;
868
869 if ((r = BN_new()) == NULL)
870 goto err;
871 if ((s = BN_new()) == NULL) {
872 BN_free(r);
873 goto err;
874 }
875
876 memset(&kop, 0, sizeof kop);
877 kop.crk_op = CRK_DSA_SIGN;
878
879 /* inputs: dgst dsa->p dsa->q dsa->g dsa->priv_key */
880 kop.crk_param[0].crp_p = (caddr_t)dgst;
881 kop.crk_param[0].crp_nbits = dlen * 8;
882 if (bn2crparam(dsa->p, &kop.crk_param[1]))
883 goto err;
884 if (bn2crparam(dsa->q, &kop.crk_param[2]))
885 goto err;
886 if (bn2crparam(dsa->g, &kop.crk_param[3]))
887 goto err;
888 if (bn2crparam(dsa->priv_key, &kop.crk_param[4]))
889 goto err;
890 kop.crk_iparams = 5;
891
892 if (cryptodev_asym(&kop, BN_num_bytes(dsa->q), r,
893 BN_num_bytes(dsa->q), s) == 0) {
894 dsaret = DSA_SIG_new();
895 dsaret->r = r;
896 dsaret->s = s;
897 } else {
898 const DSA_METHOD *meth = DSA_OpenSSL();
899 BN_free(r);
900 BN_free(s);
901 dsaret = (meth->dsa_do_sign)(dgst, dlen, dsa);
902 }
903 err:
904 kop.crk_param[0].crp_p = NULL;
905 zapparams(&kop);
906 return (dsaret);
907 }
908
909 static int
cryptodev_dsa_verify(const unsigned char * dgst,int dlen,DSA_SIG * sig,DSA * dsa)910 cryptodev_dsa_verify(const unsigned char *dgst, int dlen,
911 DSA_SIG *sig, DSA *dsa)
912 {
913 struct crypt_kop kop;
914 int dsaret = 1;
915
916 memset(&kop, 0, sizeof kop);
917 kop.crk_op = CRK_DSA_VERIFY;
918
919 /* inputs: dgst dsa->p dsa->q dsa->g dsa->pub_key sig->r sig->s */
920 kop.crk_param[0].crp_p = (caddr_t)dgst;
921 kop.crk_param[0].crp_nbits = dlen * 8;
922 if (bn2crparam(dsa->p, &kop.crk_param[1]))
923 goto err;
924 if (bn2crparam(dsa->q, &kop.crk_param[2]))
925 goto err;
926 if (bn2crparam(dsa->g, &kop.crk_param[3]))
927 goto err;
928 if (bn2crparam(dsa->pub_key, &kop.crk_param[4]))
929 goto err;
930 if (bn2crparam(sig->r, &kop.crk_param[5]))
931 goto err;
932 if (bn2crparam(sig->s, &kop.crk_param[6]))
933 goto err;
934 kop.crk_iparams = 7;
935
936 if (cryptodev_asym(&kop, 0, NULL, 0, NULL) == 0) {
937 dsaret = kop.crk_status;
938 } else {
939 const DSA_METHOD *meth = DSA_OpenSSL();
940
941 dsaret = (meth->dsa_do_verify)(dgst, dlen, sig, dsa);
942 }
943 err:
944 kop.crk_param[0].crp_p = NULL;
945 zapparams(&kop);
946 return (dsaret);
947 }
948
949 static DSA_METHOD cryptodev_dsa = {
950 "cryptodev DSA method",
951 NULL,
952 NULL, /* dsa_sign_setup */
953 NULL,
954 NULL, /* dsa_mod_exp */
955 NULL,
956 NULL, /* init */
957 NULL, /* finish */
958 0, /* flags */
959 NULL /* app_data */
960 };
961
962 static int
cryptodev_mod_exp_dh(const DH * dh,BIGNUM * r,const BIGNUM * a,const BIGNUM * p,const BIGNUM * m,BN_CTX * ctx,BN_MONT_CTX * m_ctx)963 cryptodev_mod_exp_dh(const DH *dh, BIGNUM *r, const BIGNUM *a,
964 const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx,
965 BN_MONT_CTX *m_ctx)
966 {
967 return (cryptodev_bn_mod_exp(r, a, p, m, ctx, m_ctx));
968 }
969
970 static int
cryptodev_dh_compute_key(unsigned char * key,const BIGNUM * pub_key,DH * dh)971 cryptodev_dh_compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh)
972 {
973 struct crypt_kop kop;
974 int dhret = 1;
975 int fd, keylen;
976
977 if ((fd = get_asym_dev_crypto()) < 0) {
978 const DH_METHOD *meth = DH_OpenSSL();
979
980 return ((meth->compute_key)(key, pub_key, dh));
981 }
982
983 keylen = BN_num_bits(dh->p);
984
985 memset(&kop, 0, sizeof kop);
986 kop.crk_op = CRK_DH_COMPUTE_KEY;
987
988 /* inputs: dh->priv_key pub_key dh->p key */
989 if (bn2crparam(dh->priv_key, &kop.crk_param[0]))
990 goto err;
991 if (bn2crparam(pub_key, &kop.crk_param[1]))
992 goto err;
993 if (bn2crparam(dh->p, &kop.crk_param[2]))
994 goto err;
995 kop.crk_iparams = 3;
996
997 kop.crk_param[3].crp_p = key;
998 kop.crk_param[3].crp_nbits = keylen * 8;
999 kop.crk_oparams = 1;
1000
1001 if (ioctl(fd, CIOCKEY, &kop) == -1) {
1002 const DH_METHOD *meth = DH_OpenSSL();
1003
1004 dhret = (meth->compute_key)(key, pub_key, dh);
1005 }
1006 err:
1007 kop.crk_param[3].crp_p = NULL;
1008 zapparams(&kop);
1009 return (dhret);
1010 }
1011
1012 static DH_METHOD cryptodev_dh = {
1013 "cryptodev DH method",
1014 NULL, /* cryptodev_dh_generate_key */
1015 NULL,
1016 NULL,
1017 NULL,
1018 NULL,
1019 0, /* flags */
1020 NULL /* app_data */
1021 };
1022
1023 /*
1024 * ctrl right now is just a wrapper that doesn't do much
1025 * but I expect we'll want some options soon.
1026 */
1027 static int
cryptodev_ctrl(ENGINE * e,int cmd,long i,void * p,void (* f)())1028 cryptodev_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)())
1029 {
1030 #ifdef HAVE_SYSLOG_R
1031 struct syslog_data sd = SYSLOG_DATA_INIT;
1032 #endif
1033
1034 switch (cmd) {
1035 default:
1036 #ifdef HAVE_SYSLOG_R
1037 syslog_r(LOG_ERR, &sd,
1038 "cryptodev_ctrl: unknown command %d", cmd);
1039 #else
1040 syslog(LOG_ERR, "cryptodev_ctrl: unknown command %d", cmd);
1041 #endif
1042 break;
1043 }
1044 return (1);
1045 }
1046
1047 void
ENGINE_load_cryptodev(void)1048 ENGINE_load_cryptodev(void)
1049 {
1050 ENGINE *engine = ENGINE_new();
1051 int fd;
1052
1053 if (engine == NULL)
1054 return;
1055 if ((fd = get_dev_crypto()) < 0) {
1056 ENGINE_free(engine);
1057 return;
1058 }
1059
1060 /*
1061 * find out what asymmetric crypto algorithms we support
1062 */
1063 if (ioctl(fd, CIOCASYMFEAT, &cryptodev_asymfeat) == -1) {
1064 close(fd);
1065 ENGINE_free(engine);
1066 return;
1067 }
1068 close(fd);
1069
1070 if (!ENGINE_set_id(engine, "cryptodev") ||
1071 !ENGINE_set_name(engine, "BSD cryptodev engine") ||
1072 !ENGINE_set_ciphers(engine, cryptodev_engine_ciphers) ||
1073 !ENGINE_set_digests(engine, cryptodev_engine_digests) ||
1074 !ENGINE_set_ctrl_function(engine, cryptodev_ctrl) ||
1075 !ENGINE_set_cmd_defns(engine, cryptodev_defns)) {
1076 ENGINE_free(engine);
1077 return;
1078 }
1079
1080 if (ENGINE_set_RSA(engine, &cryptodev_rsa)) {
1081 const RSA_METHOD *rsa_meth = RSA_PKCS1_SSLeay();
1082
1083 cryptodev_rsa.bn_mod_exp = rsa_meth->bn_mod_exp;
1084 cryptodev_rsa.rsa_mod_exp = rsa_meth->rsa_mod_exp;
1085 cryptodev_rsa.rsa_pub_enc = rsa_meth->rsa_pub_enc;
1086 cryptodev_rsa.rsa_pub_dec = rsa_meth->rsa_pub_dec;
1087 cryptodev_rsa.rsa_priv_enc = rsa_meth->rsa_priv_enc;
1088 cryptodev_rsa.rsa_priv_dec = rsa_meth->rsa_priv_dec;
1089 if (cryptodev_asymfeat & CRF_MOD_EXP) {
1090 cryptodev_rsa.bn_mod_exp = cryptodev_bn_mod_exp;
1091 if (cryptodev_asymfeat & CRF_MOD_EXP_CRT)
1092 cryptodev_rsa.rsa_mod_exp =
1093 cryptodev_rsa_mod_exp;
1094 else
1095 cryptodev_rsa.rsa_mod_exp =
1096 cryptodev_rsa_nocrt_mod_exp;
1097 }
1098 }
1099
1100 if (ENGINE_set_DSA(engine, &cryptodev_dsa)) {
1101 const DSA_METHOD *meth = DSA_OpenSSL();
1102
1103 memcpy(&cryptodev_dsa, meth, sizeof(DSA_METHOD));
1104 if (cryptodev_asymfeat & CRF_DSA_SIGN)
1105 cryptodev_dsa.dsa_do_sign = cryptodev_dsa_do_sign;
1106 if (cryptodev_asymfeat & CRF_MOD_EXP) {
1107 cryptodev_dsa.bn_mod_exp = cryptodev_dsa_bn_mod_exp;
1108 cryptodev_dsa.dsa_mod_exp = cryptodev_dsa_dsa_mod_exp;
1109 }
1110 if (cryptodev_asymfeat & CRF_DSA_VERIFY)
1111 cryptodev_dsa.dsa_do_verify = cryptodev_dsa_verify;
1112 }
1113
1114 if (ENGINE_set_DH(engine, &cryptodev_dh)){
1115 const DH_METHOD *dh_meth = DH_OpenSSL();
1116
1117 cryptodev_dh.generate_key = dh_meth->generate_key;
1118 cryptodev_dh.compute_key = dh_meth->compute_key;
1119 cryptodev_dh.bn_mod_exp = dh_meth->bn_mod_exp;
1120 if (cryptodev_asymfeat & CRF_MOD_EXP) {
1121 cryptodev_dh.bn_mod_exp = cryptodev_mod_exp_dh;
1122 if (cryptodev_asymfeat & CRF_DH_COMPUTE_KEY)
1123 cryptodev_dh.compute_key =
1124 cryptodev_dh_compute_key;
1125 }
1126 }
1127
1128 ENGINE_add(engine);
1129 ENGINE_free(engine);
1130 ERR_clear_error();
1131 }
1132
1133 #endif /* HAVE_CRYPTODEV */
1134