eng_cryptodev.c revision bdfb8ad83da0647e9b9a32792598e8ce7ba3ef4d
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 47void 48ENGINE_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 68struct dev_crypto_state { 69 struct session_op d_sess; 70 int d_fd; 71}; 72 73static u_int32_t cryptodev_asymfeat = 0; 74 75static int get_asym_dev_crypto(void); 76static int open_dev_crypto(void); 77static int get_dev_crypto(void); 78static int cryptodev_max_iv(int cipher); 79static int cryptodev_key_length_valid(int cipher, int len); 80static int cipher_nid_to_cryptodev(int nid); 81static int get_cryptodev_ciphers(const int **cnids); 82static int get_cryptodev_digests(const int **cnids); 83static int cryptodev_usable_ciphers(const int **nids); 84static int cryptodev_usable_digests(const int **nids); 85static int cryptodev_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 86 const unsigned char *in, unsigned int inl); 87static int cryptodev_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 88 const unsigned char *iv, int enc); 89static int cryptodev_cleanup(EVP_CIPHER_CTX *ctx); 90static int cryptodev_engine_ciphers(ENGINE *e, const EVP_CIPHER **cipher, 91 const int **nids, int nid); 92static int cryptodev_engine_digests(ENGINE *e, const EVP_MD **digest, 93 const int **nids, int nid); 94static int bn2crparam(const BIGNUM *a, struct crparam *crp); 95static int crparam2bn(struct crparam *crp, BIGNUM *a); 96static void zapparams(struct crypt_kop *kop); 97static int cryptodev_asym(struct crypt_kop *kop, int rlen, BIGNUM *r, 98 int slen, BIGNUM *s); 99 100static 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); 102static int cryptodev_rsa_nocrt_mod_exp(BIGNUM *r0, const BIGNUM *I, 103 RSA *rsa); 104static int cryptodev_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx); 105static 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); 107static 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); 110static DSA_SIG *cryptodev_dsa_do_sign(const unsigned char *dgst, 111 int dlen, DSA *dsa); 112static int cryptodev_dsa_verify(const unsigned char *dgst, int dgst_len, 113 DSA_SIG *sig, DSA *dsa); 114static 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); 117static int cryptodev_dh_compute_key(unsigned char *key, 118 const BIGNUM *pub_key, DH *dh); 119static int cryptodev_ctrl(ENGINE *e, int cmd, long i, void *p, 120 void (*f)()); 121void ENGINE_load_cryptodev(void); 122 123static const ENGINE_CMD_DEFN cryptodev_defns[] = { 124 { 0, NULL, NULL, 0 } 125}; 126 127static 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 142static 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 */ 158static int 159open_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 176static int 177get_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 */ 195static int 196get_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 */ 209static int 210cryptodev_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 */ 226static int 227cryptodev_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 */ 238static int 239cipher_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 */ 255static int 256get_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 */ 294static int 295get_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 */ 345static int 346cryptodev_usable_ciphers(const int **nids) 347{ 348 return (get_cryptodev_ciphers(nids)); 349} 350 351static int 352cryptodev_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 370static int 371cryptodev_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 424static int 425cryptodev_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 */ 462static int 463cryptodev_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 */ 500const 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 */ 514const 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 527const 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 540const 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 553const 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 */ 571static int 572cryptodev_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 601static int 602cryptodev_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 */ 624static int 625bn2crparam(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 */ 656static int 657crparam2bn(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 679static void 680zapparams(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 692static int 693cryptodev_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 722static int 723cryptodev_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 } 753err: 754 zapparams(&kop); 755 return (ret); 756} 757 758static int 759cryptodev_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 770static int 771cryptodev_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 } 802err: 803 zapparams(&kop); 804 return (ret); 805} 806 807static 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 823static int 824cryptodev_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 830static int 831cryptodev_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; 857err: 858 BN_free(&t2); 859 return(ret); 860} 861 862static DSA_SIG * 863cryptodev_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 } 903err: 904 kop.crk_param[0].crp_p = NULL; 905 zapparams(&kop); 906 return (dsaret); 907} 908 909static int 910cryptodev_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 } 943err: 944 kop.crk_param[0].crp_p = NULL; 945 zapparams(&kop); 946 return (dsaret); 947} 948 949static 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 962static int 963cryptodev_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 970static int 971cryptodev_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 } 1006err: 1007 kop.crk_param[3].crp_p = NULL; 1008 zapparams(&kop); 1009 return (dhret); 1010} 1011 1012static 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 */ 1027static int 1028cryptodev_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 1047void 1048ENGINE_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