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#include <openssl/dsa.h> 34#include <openssl/rsa.h> 35#include <openssl/dh.h> 36#include <openssl/err.h> 37 38#if (defined(__unix__) || defined(unix)) && !defined(USG) && \ 39 (defined(OpenBSD) || defined(__FreeBSD__)) 40# include <sys/param.h> 41# if (OpenBSD >= 200112) || ((__FreeBSD_version >= 470101 && __FreeBSD_version < 500000) || __FreeBSD_version >= 500041) 42# define HAVE_CRYPTODEV 43# endif 44# if (OpenBSD >= 200110) 45# define HAVE_SYSLOG_R 46# endif 47#endif 48 49#ifndef HAVE_CRYPTODEV 50 51void ENGINE_load_cryptodev(void) 52{ 53 /* This is a NOP on platforms without /dev/crypto */ 54 return; 55} 56 57#else 58 59# include <sys/types.h> 60# include <crypto/cryptodev.h> 61# include <sys/ioctl.h> 62# include <errno.h> 63# include <stdio.h> 64# include <unistd.h> 65# include <fcntl.h> 66# include <stdarg.h> 67# include <syslog.h> 68# include <errno.h> 69# include <string.h> 70 71struct dev_crypto_state { 72 struct session_op d_sess; 73 int d_fd; 74}; 75 76static u_int32_t cryptodev_asymfeat = 0; 77 78static int get_asym_dev_crypto(void); 79static int open_dev_crypto(void); 80static int get_dev_crypto(void); 81static int cryptodev_max_iv(int cipher); 82static int cryptodev_key_length_valid(int cipher, int len); 83static int cipher_nid_to_cryptodev(int nid); 84static int get_cryptodev_ciphers(const int **cnids); 85/* 86 * static int get_cryptodev_digests(const int **cnids); 87 */ 88static int cryptodev_usable_ciphers(const int **nids); 89static int cryptodev_usable_digests(const int **nids); 90static int cryptodev_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 91 const unsigned char *in, unsigned int inl); 92static int cryptodev_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 93 const unsigned char *iv, int enc); 94static int cryptodev_cleanup(EVP_CIPHER_CTX *ctx); 95static int cryptodev_engine_ciphers(ENGINE *e, const EVP_CIPHER **cipher, 96 const int **nids, int nid); 97static int cryptodev_engine_digests(ENGINE *e, const EVP_MD **digest, 98 const int **nids, int nid); 99static int bn2crparam(const BIGNUM *a, struct crparam *crp); 100static int crparam2bn(struct crparam *crp, BIGNUM *a); 101static void zapparams(struct crypt_kop *kop); 102static int cryptodev_asym(struct crypt_kop *kop, int rlen, BIGNUM *r, 103 int slen, BIGNUM *s); 104 105static int cryptodev_bn_mod_exp(BIGNUM *r, const BIGNUM *a, 106 const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx, 107 BN_MONT_CTX *m_ctx); 108static int cryptodev_rsa_nocrt_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa, 109 BN_CTX *ctx); 110static int cryptodev_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa, 111 BN_CTX *ctx); 112static int cryptodev_dsa_bn_mod_exp(DSA *dsa, BIGNUM *r, BIGNUM *a, 113 const BIGNUM *p, const BIGNUM *m, 114 BN_CTX *ctx, BN_MONT_CTX *m_ctx); 115static int cryptodev_dsa_dsa_mod_exp(DSA *dsa, BIGNUM *t1, BIGNUM *g, 116 BIGNUM *u1, BIGNUM *pub_key, BIGNUM *u2, 117 BIGNUM *p, BN_CTX *ctx, 118 BN_MONT_CTX *mont); 119static DSA_SIG *cryptodev_dsa_do_sign(const unsigned char *dgst, int dlen, 120 DSA *dsa); 121static int cryptodev_dsa_verify(const unsigned char *dgst, int dgst_len, 122 DSA_SIG *sig, DSA *dsa); 123static int cryptodev_mod_exp_dh(const DH *dh, BIGNUM *r, const BIGNUM *a, 124 const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx, 125 BN_MONT_CTX *m_ctx); 126static int cryptodev_dh_compute_key(unsigned char *key, const BIGNUM *pub_key, 127 DH *dh); 128static int cryptodev_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f) ()); 129void ENGINE_load_cryptodev(void); 130 131static const ENGINE_CMD_DEFN cryptodev_defns[] = { 132 {0, NULL, NULL, 0} 133}; 134 135static struct { 136 int id; 137 int nid; 138 int ivmax; 139 int keylen; 140} ciphers[] = { 141 { 142 CRYPTO_DES_CBC, NID_des_cbc, 8, 8, 143 }, 144 { 145 CRYPTO_3DES_CBC, NID_des_ede3_cbc, 8, 24, 146 }, 147 { 148 CRYPTO_AES_CBC, NID_aes_128_cbc, 16, 16, 149 }, 150 { 151 CRYPTO_BLF_CBC, NID_bf_cbc, 8, 16, 152 }, 153 { 154 CRYPTO_CAST_CBC, NID_cast5_cbc, 8, 16, 155 }, 156 { 157 CRYPTO_SKIPJACK_CBC, NID_undef, 0, 0, 158 }, 159 { 160 0, NID_undef, 0, 0, 161 }, 162}; 163 164# if 0 165static struct { 166 int id; 167 int nid; 168} digests[] = { 169 { 170 CRYPTO_SHA1_HMAC, NID_hmacWithSHA1, 171 }, 172 { 173 CRYPTO_RIPEMD160_HMAC, NID_ripemd160, 174 }, 175 { 176 CRYPTO_MD5_KPDK, NID_undef, 177 }, 178 { 179 CRYPTO_SHA1_KPDK, NID_undef, 180 }, 181 { 182 CRYPTO_MD5, NID_md5, 183 }, 184 { 185 CRYPTO_SHA1, NID_undef, 186 }, 187 { 188 0, NID_undef, 189 }, 190}; 191# endif 192 193/* 194 * Return a fd if /dev/crypto seems usable, 0 otherwise. 195 */ 196static int open_dev_crypto(void) 197{ 198 static int fd = -1; 199 200 if (fd == -1) { 201 if ((fd = open("/dev/crypto", O_RDWR, 0)) == -1) 202 return (-1); 203 /* close on exec */ 204 if (fcntl(fd, F_SETFD, 1) == -1) { 205 close(fd); 206 fd = -1; 207 return (-1); 208 } 209 } 210 return (fd); 211} 212 213static int get_dev_crypto(void) 214{ 215 int fd, retfd; 216 217 if ((fd = open_dev_crypto()) == -1) 218 return (-1); 219 if (ioctl(fd, CRIOGET, &retfd) == -1) 220 return (-1); 221 222 /* close on exec */ 223 if (fcntl(retfd, F_SETFD, 1) == -1) { 224 close(retfd); 225 return (-1); 226 } 227 return (retfd); 228} 229 230/* Caching version for asym operations */ 231static int get_asym_dev_crypto(void) 232{ 233 static int fd = -1; 234 235 if (fd == -1) 236 fd = get_dev_crypto(); 237 return fd; 238} 239 240/* 241 * XXXX this needs to be set for each alg - and determined from 242 * a running card. 243 */ 244static int cryptodev_max_iv(int cipher) 245{ 246 int i; 247 248 for (i = 0; ciphers[i].id; i++) 249 if (ciphers[i].id == cipher) 250 return (ciphers[i].ivmax); 251 return (0); 252} 253 254/* 255 * XXXX this needs to be set for each alg - and determined from 256 * a running card. For now, fake it out - but most of these 257 * for real devices should return 1 for the supported key 258 * sizes the device can handle. 259 */ 260static int cryptodev_key_length_valid(int cipher, int len) 261{ 262 int i; 263 264 for (i = 0; ciphers[i].id; i++) 265 if (ciphers[i].id == cipher) 266 return (ciphers[i].keylen == len); 267 return (0); 268} 269 270/* convert libcrypto nids to cryptodev */ 271static int cipher_nid_to_cryptodev(int nid) 272{ 273 int i; 274 275 for (i = 0; ciphers[i].id; i++) 276 if (ciphers[i].nid == nid) 277 return (ciphers[i].id); 278 return (0); 279} 280 281/* 282 * Find out what ciphers /dev/crypto will let us have a session for. 283 * XXX note, that some of these openssl doesn't deal with yet! 284 * returning them here is harmless, as long as we return NULL 285 * when asked for a handler in the cryptodev_engine_ciphers routine 286 */ 287static int get_cryptodev_ciphers(const int **cnids) 288{ 289 static int nids[CRYPTO_ALGORITHM_MAX]; 290 struct session_op sess; 291 int fd, i, count = 0; 292 293 if ((fd = get_dev_crypto()) < 0) { 294 *cnids = NULL; 295 return (0); 296 } 297 memset(&sess, 0, sizeof(sess)); 298 sess.key = (caddr_t) "123456781234567812345678"; 299 300 for (i = 0; ciphers[i].id && count < CRYPTO_ALGORITHM_MAX; i++) { 301 if (ciphers[i].nid == NID_undef) 302 continue; 303 sess.cipher = ciphers[i].id; 304 sess.keylen = ciphers[i].keylen; 305 sess.mac = 0; 306 if (ioctl(fd, CIOCGSESSION, &sess) != -1 && 307 ioctl(fd, CIOCFSESSION, &sess.ses) != -1) 308 nids[count++] = ciphers[i].nid; 309 } 310 close(fd); 311 312 if (count > 0) 313 *cnids = nids; 314 else 315 *cnids = NULL; 316 return (count); 317} 318 319# if 0 /* unused */ 320/* 321 * Find out what digests /dev/crypto will let us have a session for. 322 * XXX note, that some of these openssl doesn't deal with yet! 323 * returning them here is harmless, as long as we return NULL 324 * when asked for a handler in the cryptodev_engine_digests routine 325 */ 326static int get_cryptodev_digests(const int **cnids) 327{ 328 static int nids[CRYPTO_ALGORITHM_MAX]; 329 struct session_op sess; 330 int fd, i, count = 0; 331 332 if ((fd = get_dev_crypto()) < 0) { 333 *cnids = NULL; 334 return (0); 335 } 336 memset(&sess, 0, sizeof(sess)); 337 for (i = 0; digests[i].id && count < CRYPTO_ALGORITHM_MAX; i++) { 338 if (digests[i].nid == NID_undef) 339 continue; 340 sess.mac = digests[i].id; 341 sess.cipher = 0; 342 if (ioctl(fd, CIOCGSESSION, &sess) != -1 && 343 ioctl(fd, CIOCFSESSION, &sess.ses) != -1) 344 nids[count++] = digests[i].nid; 345 } 346 close(fd); 347 348 if (count > 0) 349 *cnids = nids; 350 else 351 *cnids = NULL; 352 return (count); 353} 354 355# endif 356 357/* 358 * Find the useable ciphers|digests from dev/crypto - this is the first 359 * thing called by the engine init crud which determines what it 360 * can use for ciphers from this engine. We want to return 361 * only what we can do, anythine else is handled by software. 362 * 363 * If we can't initialize the device to do anything useful for 364 * any reason, we want to return a NULL array, and 0 length, 365 * which forces everything to be done is software. By putting 366 * the initalization of the device in here, we ensure we can 367 * use this engine as the default, and if for whatever reason 368 * /dev/crypto won't do what we want it will just be done in 369 * software 370 * 371 * This can (should) be greatly expanded to perhaps take into 372 * account speed of the device, and what we want to do. 373 * (although the disabling of particular alg's could be controlled 374 * by the device driver with sysctl's.) - this is where we 375 * want most of the decisions made about what we actually want 376 * to use from /dev/crypto. 377 */ 378static int cryptodev_usable_ciphers(const int **nids) 379{ 380 return (get_cryptodev_ciphers(nids)); 381} 382 383static int cryptodev_usable_digests(const int **nids) 384{ 385 /* 386 * XXXX just disable all digests for now, because it sucks. 387 * we need a better way to decide this - i.e. I may not 388 * want digests on slow cards like hifn on fast machines, 389 * but might want them on slow or loaded machines, etc. 390 * will also want them when using crypto cards that don't 391 * suck moose gonads - would be nice to be able to decide something 392 * as reasonable default without having hackery that's card dependent. 393 * of course, the default should probably be just do everything, 394 * with perhaps a sysctl to turn algoritms off (or have them off 395 * by default) on cards that generally suck like the hifn. 396 */ 397 *nids = NULL; 398 return (0); 399} 400 401static int 402cryptodev_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 403 const unsigned char *in, unsigned int inl) 404{ 405 struct crypt_op cryp; 406 struct dev_crypto_state *state = ctx->cipher_data; 407 struct session_op *sess = &state->d_sess; 408 const void *iiv; 409 unsigned char save_iv[EVP_MAX_IV_LENGTH]; 410 411 if (state->d_fd < 0) 412 return (0); 413 if (!inl) 414 return (1); 415 if ((inl % ctx->cipher->block_size) != 0) 416 return (0); 417 418 memset(&cryp, 0, sizeof(cryp)); 419 420 cryp.ses = sess->ses; 421 cryp.flags = 0; 422 cryp.len = inl; 423 cryp.src = (caddr_t) in; 424 cryp.dst = (caddr_t) out; 425 cryp.mac = 0; 426 427 cryp.op = ctx->encrypt ? COP_ENCRYPT : COP_DECRYPT; 428 429 if (ctx->cipher->iv_len) { 430 cryp.iv = (caddr_t) ctx->iv; 431 if (!ctx->encrypt) { 432 iiv = in + inl - ctx->cipher->iv_len; 433 memcpy(save_iv, iiv, ctx->cipher->iv_len); 434 } 435 } else 436 cryp.iv = NULL; 437 438 if (ioctl(state->d_fd, CIOCCRYPT, &cryp) == -1) { 439 /* 440 * XXX need better errror handling this can fail for a number of 441 * different reasons. 442 */ 443 return (0); 444 } 445 446 if (ctx->cipher->iv_len) { 447 if (ctx->encrypt) 448 iiv = out + inl - ctx->cipher->iv_len; 449 else 450 iiv = save_iv; 451 memcpy(ctx->iv, iiv, ctx->cipher->iv_len); 452 } 453 return (1); 454} 455 456static int 457cryptodev_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 458 const unsigned char *iv, int enc) 459{ 460 struct dev_crypto_state *state = ctx->cipher_data; 461 struct session_op *sess = &state->d_sess; 462 int cipher; 463 464 if ((cipher = cipher_nid_to_cryptodev(ctx->cipher->nid)) == NID_undef) 465 return (0); 466 467 if (ctx->cipher->iv_len > cryptodev_max_iv(cipher)) 468 return (0); 469 470 if (!cryptodev_key_length_valid(cipher, ctx->key_len)) 471 return (0); 472 473 memset(sess, 0, sizeof(struct session_op)); 474 475 if ((state->d_fd = get_dev_crypto()) < 0) 476 return (0); 477 478 sess->key = (char *)key; 479 sess->keylen = ctx->key_len; 480 sess->cipher = cipher; 481 482 if (ioctl(state->d_fd, CIOCGSESSION, sess) == -1) { 483 close(state->d_fd); 484 state->d_fd = -1; 485 return (0); 486 } 487 return (1); 488} 489 490/* 491 * free anything we allocated earlier when initting a 492 * session, and close the session. 493 */ 494static int cryptodev_cleanup(EVP_CIPHER_CTX *ctx) 495{ 496 int ret = 0; 497 struct dev_crypto_state *state = ctx->cipher_data; 498 struct session_op *sess = &state->d_sess; 499 500 if (state->d_fd < 0) 501 return (0); 502 503 /* 504 * XXX if this ioctl fails, someting's wrong. the invoker may have called 505 * us with a bogus ctx, or we could have a device that for whatever 506 * reason just doesn't want to play ball - it's not clear what's right 507 * here - should this be an error? should it just increase a counter, 508 * hmm. For right now, we return 0 - I don't believe that to be "right". 509 * we could call the gorpy openssl lib error handlers that print messages 510 * to users of the library. hmm.. 511 */ 512 513 if (ioctl(state->d_fd, CIOCFSESSION, &sess->ses) == -1) { 514 ret = 0; 515 } else { 516 ret = 1; 517 } 518 close(state->d_fd); 519 state->d_fd = -1; 520 521 return (ret); 522} 523 524/* 525 * libcrypto EVP stuff - this is how we get wired to EVP so the engine 526 * gets called when libcrypto requests a cipher NID. 527 */ 528 529/* DES CBC EVP */ 530const EVP_CIPHER cryptodev_des_cbc = { 531 NID_des_cbc, 532 8, 8, 8, 533 EVP_CIPH_CBC_MODE, 534 cryptodev_init_key, 535 cryptodev_cipher, 536 cryptodev_cleanup, 537 sizeof(struct dev_crypto_state), 538 EVP_CIPHER_set_asn1_iv, 539 EVP_CIPHER_get_asn1_iv, 540 NULL 541}; 542 543/* 3DES CBC EVP */ 544const EVP_CIPHER cryptodev_3des_cbc = { 545 NID_des_ede3_cbc, 546 8, 24, 8, 547 EVP_CIPH_CBC_MODE, 548 cryptodev_init_key, 549 cryptodev_cipher, 550 cryptodev_cleanup, 551 sizeof(struct dev_crypto_state), 552 EVP_CIPHER_set_asn1_iv, 553 EVP_CIPHER_get_asn1_iv, 554 NULL 555}; 556 557const EVP_CIPHER cryptodev_bf_cbc = { 558 NID_bf_cbc, 559 8, 16, 8, 560 EVP_CIPH_CBC_MODE, 561 cryptodev_init_key, 562 cryptodev_cipher, 563 cryptodev_cleanup, 564 sizeof(struct dev_crypto_state), 565 EVP_CIPHER_set_asn1_iv, 566 EVP_CIPHER_get_asn1_iv, 567 NULL 568}; 569 570const EVP_CIPHER cryptodev_cast_cbc = { 571 NID_cast5_cbc, 572 8, 16, 8, 573 EVP_CIPH_CBC_MODE, 574 cryptodev_init_key, 575 cryptodev_cipher, 576 cryptodev_cleanup, 577 sizeof(struct dev_crypto_state), 578 EVP_CIPHER_set_asn1_iv, 579 EVP_CIPHER_get_asn1_iv, 580 NULL 581}; 582 583const EVP_CIPHER cryptodev_aes_cbc = { 584 NID_aes_128_cbc, 585 16, 16, 16, 586 EVP_CIPH_CBC_MODE, 587 cryptodev_init_key, 588 cryptodev_cipher, 589 cryptodev_cleanup, 590 sizeof(struct dev_crypto_state), 591 EVP_CIPHER_set_asn1_iv, 592 EVP_CIPHER_get_asn1_iv, 593 NULL 594}; 595 596/* 597 * Registered by the ENGINE when used to find out how to deal with 598 * a particular NID in the ENGINE. this says what we'll do at the 599 * top level - note, that list is restricted by what we answer with 600 */ 601static int 602cryptodev_engine_ciphers(ENGINE *e, const EVP_CIPHER **cipher, 603 const int **nids, int nid) 604{ 605 if (!cipher) 606 return (cryptodev_usable_ciphers(nids)); 607 608 switch (nid) { 609 case NID_des_ede3_cbc: 610 *cipher = &cryptodev_3des_cbc; 611 break; 612 case NID_des_cbc: 613 *cipher = &cryptodev_des_cbc; 614 break; 615 case NID_bf_cbc: 616 *cipher = &cryptodev_bf_cbc; 617 break; 618 case NID_cast5_cbc: 619 *cipher = &cryptodev_cast_cbc; 620 break; 621 case NID_aes_128_cbc: 622 *cipher = &cryptodev_aes_cbc; 623 break; 624 default: 625 *cipher = NULL; 626 break; 627 } 628 return (*cipher != NULL); 629} 630 631static int 632cryptodev_engine_digests(ENGINE *e, const EVP_MD **digest, 633 const int **nids, int nid) 634{ 635 if (!digest) 636 return (cryptodev_usable_digests(nids)); 637 638 switch (nid) { 639 case NID_md5: 640 *digest = NULL; /* need to make a clean md5 critter */ 641 break; 642 default: 643 *digest = NULL; 644 break; 645 } 646 return (*digest != NULL); 647} 648 649/* 650 * Convert a BIGNUM to the representation that /dev/crypto needs. 651 * Upon completion of use, the caller is responsible for freeing 652 * crp->crp_p. 653 */ 654static int bn2crparam(const BIGNUM *a, struct crparam *crp) 655{ 656 int i, j, k; 657 ssize_t bytes, bits; 658 u_char *b; 659 660 crp->crp_p = NULL; 661 crp->crp_nbits = 0; 662 663 bits = BN_num_bits(a); 664 bytes = (bits + 7) / 8; 665 666 b = malloc(bytes); 667 if (b == NULL) 668 return (1); 669 670 crp->crp_p = (char *)b; 671 crp->crp_nbits = bits; 672 673 for (i = 0, j = 0; i < a->top; i++) { 674 for (k = 0; k < BN_BITS2 / 8; k++) { 675 if ((j + k) >= bytes) 676 return (0); 677 b[j + k] = a->d[i] >> (k * 8); 678 } 679 j += BN_BITS2 / 8; 680 } 681 return (0); 682} 683 684/* Convert a /dev/crypto parameter to a BIGNUM */ 685static int crparam2bn(struct crparam *crp, BIGNUM *a) 686{ 687 u_int8_t *pd; 688 int i, bytes; 689 690 bytes = (crp->crp_nbits + 7) / 8; 691 692 if (bytes == 0) 693 return (-1); 694 695 if ((pd = (u_int8_t *) malloc(bytes)) == NULL) 696 return (-1); 697 698 for (i = 0; i < bytes; i++) 699 pd[i] = crp->crp_p[bytes - i - 1]; 700 701 BN_bin2bn(pd, bytes, a); 702 free(pd); 703 704 return (0); 705} 706 707static void zapparams(struct crypt_kop *kop) 708{ 709 int i; 710 711 for (i = 0; i <= kop->crk_iparams + kop->crk_oparams; i++) { 712 if (kop->crk_param[i].crp_p) 713 free(kop->crk_param[i].crp_p); 714 kop->crk_param[i].crp_p = NULL; 715 kop->crk_param[i].crp_nbits = 0; 716 } 717} 718 719static int 720cryptodev_asym(struct crypt_kop *kop, int rlen, BIGNUM *r, int slen, 721 BIGNUM *s) 722{ 723 int fd, ret = -1; 724 725 if ((fd = get_asym_dev_crypto()) < 0) 726 return (ret); 727 728 if (r) { 729 kop->crk_param[kop->crk_iparams].crp_p = calloc(rlen, sizeof(char)); 730 kop->crk_param[kop->crk_iparams].crp_nbits = rlen * 8; 731 kop->crk_oparams++; 732 } 733 if (s) { 734 kop->crk_param[kop->crk_iparams + 1].crp_p = 735 calloc(slen, sizeof(char)); 736 kop->crk_param[kop->crk_iparams + 1].crp_nbits = slen * 8; 737 kop->crk_oparams++; 738 } 739 740 if (ioctl(fd, CIOCKEY, kop) == 0) { 741 if (r) 742 crparam2bn(&kop->crk_param[kop->crk_iparams], r); 743 if (s) 744 crparam2bn(&kop->crk_param[kop->crk_iparams + 1], s); 745 ret = 0; 746 } 747 748 return (ret); 749} 750 751static int 752cryptodev_bn_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, 753 const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *in_mont) 754{ 755 struct crypt_kop kop; 756 int ret = 1; 757 758 /* 759 * Currently, we know we can do mod exp iff we can do any asymmetric 760 * operations at all. 761 */ 762 if (cryptodev_asymfeat == 0) { 763 ret = BN_mod_exp(r, a, p, m, ctx); 764 return (ret); 765 } 766 767 memset(&kop, 0, sizeof kop); 768 kop.crk_op = CRK_MOD_EXP; 769 770 /* inputs: a^p % m */ 771 if (bn2crparam(a, &kop.crk_param[0])) 772 goto err; 773 if (bn2crparam(p, &kop.crk_param[1])) 774 goto err; 775 if (bn2crparam(m, &kop.crk_param[2])) 776 goto err; 777 kop.crk_iparams = 3; 778 779 if (cryptodev_asym(&kop, BN_num_bytes(m), r, 0, NULL)) { 780 const RSA_METHOD *meth = RSA_PKCS1_SSLeay(); 781 printf("OCF asym process failed, Running in software\n"); 782 ret = meth->bn_mod_exp(r, a, p, m, ctx, in_mont); 783 784 } else if (ECANCELED == kop.crk_status) { 785 const RSA_METHOD *meth = RSA_PKCS1_SSLeay(); 786 printf("OCF hardware operation cancelled. Running in Software\n"); 787 ret = meth->bn_mod_exp(r, a, p, m, ctx, in_mont); 788 } 789 /* else cryptodev operation worked ok ==> ret = 1 */ 790 791 err: 792 zapparams(&kop); 793 return (ret); 794} 795 796static int 797cryptodev_rsa_nocrt_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa, 798 BN_CTX *ctx) 799{ 800 int r; 801 802 r = cryptodev_bn_mod_exp(r0, I, rsa->d, rsa->n, ctx, NULL); 803 return (r); 804} 805 806static int 807cryptodev_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx) 808{ 809 struct crypt_kop kop; 810 int ret = 1; 811 812 if (!rsa->p || !rsa->q || !rsa->dmp1 || !rsa->dmq1 || !rsa->iqmp) { 813 /* XXX 0 means failure?? */ 814 return (0); 815 } 816 817 memset(&kop, 0, sizeof kop); 818 kop.crk_op = CRK_MOD_EXP_CRT; 819 /* inputs: rsa->p rsa->q I rsa->dmp1 rsa->dmq1 rsa->iqmp */ 820 if (bn2crparam(rsa->p, &kop.crk_param[0])) 821 goto err; 822 if (bn2crparam(rsa->q, &kop.crk_param[1])) 823 goto err; 824 if (bn2crparam(I, &kop.crk_param[2])) 825 goto err; 826 if (bn2crparam(rsa->dmp1, &kop.crk_param[3])) 827 goto err; 828 if (bn2crparam(rsa->dmq1, &kop.crk_param[4])) 829 goto err; 830 if (bn2crparam(rsa->iqmp, &kop.crk_param[5])) 831 goto err; 832 kop.crk_iparams = 6; 833 834 if (cryptodev_asym(&kop, BN_num_bytes(rsa->n), r0, 0, NULL)) { 835 const RSA_METHOD *meth = RSA_PKCS1_SSLeay(); 836 printf("OCF asym process failed, running in Software\n"); 837 ret = (*meth->rsa_mod_exp) (r0, I, rsa, ctx); 838 839 } else if (ECANCELED == kop.crk_status) { 840 const RSA_METHOD *meth = RSA_PKCS1_SSLeay(); 841 printf("OCF hardware operation cancelled. Running in Software\n"); 842 ret = (*meth->rsa_mod_exp) (r0, I, rsa, ctx); 843 } 844 /* else cryptodev operation worked ok ==> ret = 1 */ 845 846 err: 847 zapparams(&kop); 848 return (ret); 849} 850 851static RSA_METHOD cryptodev_rsa = { 852 "cryptodev RSA method", 853 NULL, /* rsa_pub_enc */ 854 NULL, /* rsa_pub_dec */ 855 NULL, /* rsa_priv_enc */ 856 NULL, /* rsa_priv_dec */ 857 NULL, 858 NULL, 859 NULL, /* init */ 860 NULL, /* finish */ 861 0, /* flags */ 862 NULL, /* app_data */ 863 NULL, /* rsa_sign */ 864 NULL /* rsa_verify */ 865}; 866 867static int 868cryptodev_dsa_bn_mod_exp(DSA *dsa, BIGNUM *r, BIGNUM *a, const BIGNUM *p, 869 const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx) 870{ 871 return (cryptodev_bn_mod_exp(r, a, p, m, ctx, m_ctx)); 872} 873 874static int 875cryptodev_dsa_dsa_mod_exp(DSA *dsa, BIGNUM *t1, BIGNUM *g, 876 BIGNUM *u1, BIGNUM *pub_key, BIGNUM *u2, BIGNUM *p, 877 BN_CTX *ctx, BN_MONT_CTX *mont) 878{ 879 BIGNUM t2; 880 int ret = 0; 881 882 BN_init(&t2); 883 884 /* v = ( g^u1 * y^u2 mod p ) mod q */ 885 /* let t1 = g ^ u1 mod p */ 886 ret = 0; 887 888 if (!dsa->meth->bn_mod_exp(dsa, t1, dsa->g, u1, dsa->p, ctx, mont)) 889 goto err; 890 891 /* let t2 = y ^ u2 mod p */ 892 if (!dsa->meth->bn_mod_exp(dsa, &t2, dsa->pub_key, u2, dsa->p, ctx, mont)) 893 goto err; 894 /* let u1 = t1 * t2 mod p */ 895 if (!BN_mod_mul(u1, t1, &t2, dsa->p, ctx)) 896 goto err; 897 898 BN_copy(t1, u1); 899 900 ret = 1; 901 err: 902 BN_free(&t2); 903 return (ret); 904} 905 906static DSA_SIG *cryptodev_dsa_do_sign(const unsigned char *dgst, int dlen, 907 DSA *dsa) 908{ 909 struct crypt_kop kop; 910 BIGNUM *r = NULL, *s = NULL; 911 DSA_SIG *dsaret = NULL; 912 913 if ((r = BN_new()) == NULL) 914 goto err; 915 if ((s = BN_new()) == NULL) { 916 BN_free(r); 917 goto err; 918 } 919 920 memset(&kop, 0, sizeof kop); 921 kop.crk_op = CRK_DSA_SIGN; 922 923 /* inputs: dgst dsa->p dsa->q dsa->g dsa->priv_key */ 924 kop.crk_param[0].crp_p = (caddr_t) dgst; 925 kop.crk_param[0].crp_nbits = dlen * 8; 926 if (bn2crparam(dsa->p, &kop.crk_param[1])) 927 goto err; 928 if (bn2crparam(dsa->q, &kop.crk_param[2])) 929 goto err; 930 if (bn2crparam(dsa->g, &kop.crk_param[3])) 931 goto err; 932 if (bn2crparam(dsa->priv_key, &kop.crk_param[4])) 933 goto err; 934 kop.crk_iparams = 5; 935 936 if (cryptodev_asym(&kop, BN_num_bytes(dsa->q), r, 937 BN_num_bytes(dsa->q), s) == 0) { 938 dsaret = DSA_SIG_new(); 939 dsaret->r = r; 940 dsaret->s = s; 941 } else { 942 const DSA_METHOD *meth = DSA_OpenSSL(); 943 BN_free(r); 944 BN_free(s); 945 dsaret = (meth->dsa_do_sign) (dgst, dlen, dsa); 946 } 947 err: 948 kop.crk_param[0].crp_p = NULL; 949 zapparams(&kop); 950 return (dsaret); 951} 952 953static int 954cryptodev_dsa_verify(const unsigned char *dgst, int dlen, 955 DSA_SIG *sig, DSA *dsa) 956{ 957 struct crypt_kop kop; 958 int dsaret = 1; 959 960 memset(&kop, 0, sizeof kop); 961 kop.crk_op = CRK_DSA_VERIFY; 962 963 /* inputs: dgst dsa->p dsa->q dsa->g dsa->pub_key sig->r sig->s */ 964 kop.crk_param[0].crp_p = (caddr_t) dgst; 965 kop.crk_param[0].crp_nbits = dlen * 8; 966 if (bn2crparam(dsa->p, &kop.crk_param[1])) 967 goto err; 968 if (bn2crparam(dsa->q, &kop.crk_param[2])) 969 goto err; 970 if (bn2crparam(dsa->g, &kop.crk_param[3])) 971 goto err; 972 if (bn2crparam(dsa->pub_key, &kop.crk_param[4])) 973 goto err; 974 if (bn2crparam(sig->r, &kop.crk_param[5])) 975 goto err; 976 if (bn2crparam(sig->s, &kop.crk_param[6])) 977 goto err; 978 kop.crk_iparams = 7; 979 980 if (cryptodev_asym(&kop, 0, NULL, 0, NULL) == 0) { 981 /* 982 * OCF success value is 0, if not zero, change dsaret to fail 983 */ 984 if (0 != kop.crk_status) 985 dsaret = 0; 986 } else { 987 const DSA_METHOD *meth = DSA_OpenSSL(); 988 989 dsaret = (meth->dsa_do_verify) (dgst, dlen, sig, dsa); 990 } 991 err: 992 kop.crk_param[0].crp_p = NULL; 993 zapparams(&kop); 994 return (dsaret); 995} 996 997static DSA_METHOD cryptodev_dsa = { 998 "cryptodev DSA method", 999 NULL, 1000 NULL, /* dsa_sign_setup */ 1001 NULL, 1002 NULL, /* dsa_mod_exp */ 1003 NULL, 1004 NULL, /* init */ 1005 NULL, /* finish */ 1006 0, /* flags */ 1007 NULL /* app_data */ 1008}; 1009 1010static int 1011cryptodev_mod_exp_dh(const DH *dh, BIGNUM *r, const BIGNUM *a, 1012 const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx, 1013 BN_MONT_CTX *m_ctx) 1014{ 1015 return (cryptodev_bn_mod_exp(r, a, p, m, ctx, m_ctx)); 1016} 1017 1018static int 1019cryptodev_dh_compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh) 1020{ 1021 struct crypt_kop kop; 1022 int dhret = 1; 1023 int fd, keylen; 1024 1025 if ((fd = get_asym_dev_crypto()) < 0) { 1026 const DH_METHOD *meth = DH_OpenSSL(); 1027 1028 return ((meth->compute_key) (key, pub_key, dh)); 1029 } 1030 1031 keylen = BN_num_bits(dh->p); 1032 1033 memset(&kop, 0, sizeof kop); 1034 kop.crk_op = CRK_DH_COMPUTE_KEY; 1035 1036 /* inputs: dh->priv_key pub_key dh->p key */ 1037 if (bn2crparam(dh->priv_key, &kop.crk_param[0])) 1038 goto err; 1039 if (bn2crparam(pub_key, &kop.crk_param[1])) 1040 goto err; 1041 if (bn2crparam(dh->p, &kop.crk_param[2])) 1042 goto err; 1043 kop.crk_iparams = 3; 1044 1045 kop.crk_param[3].crp_p = (char *)key; 1046 kop.crk_param[3].crp_nbits = keylen * 8; 1047 kop.crk_oparams = 1; 1048 1049 if (ioctl(fd, CIOCKEY, &kop) == -1) { 1050 const DH_METHOD *meth = DH_OpenSSL(); 1051 1052 dhret = (meth->compute_key) (key, pub_key, dh); 1053 } 1054 err: 1055 kop.crk_param[3].crp_p = NULL; 1056 zapparams(&kop); 1057 return (dhret); 1058} 1059 1060static DH_METHOD cryptodev_dh = { 1061 "cryptodev DH method", 1062 NULL, /* cryptodev_dh_generate_key */ 1063 NULL, 1064 NULL, 1065 NULL, 1066 NULL, 1067 0, /* flags */ 1068 NULL /* app_data */ 1069}; 1070 1071/* 1072 * ctrl right now is just a wrapper that doesn't do much 1073 * but I expect we'll want some options soon. 1074 */ 1075static int cryptodev_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f) ()) 1076{ 1077# ifdef HAVE_SYSLOG_R 1078 struct syslog_data sd = SYSLOG_DATA_INIT; 1079# endif 1080 1081 switch (cmd) { 1082 default: 1083# ifdef HAVE_SYSLOG_R 1084 syslog_r(LOG_ERR, &sd, "cryptodev_ctrl: unknown command %d", cmd); 1085# else 1086 syslog(LOG_ERR, "cryptodev_ctrl: unknown command %d", cmd); 1087# endif 1088 break; 1089 } 1090 return (1); 1091} 1092 1093void ENGINE_load_cryptodev(void) 1094{ 1095 ENGINE *engine = ENGINE_new(); 1096 int fd; 1097 1098 if (engine == NULL) 1099 return; 1100 if ((fd = get_dev_crypto()) < 0) { 1101 ENGINE_free(engine); 1102 return; 1103 } 1104 1105 /* 1106 * find out what asymmetric crypto algorithms we support 1107 */ 1108 if (ioctl(fd, CIOCASYMFEAT, &cryptodev_asymfeat) == -1) { 1109 close(fd); 1110 ENGINE_free(engine); 1111 return; 1112 } 1113 close(fd); 1114 1115 if (!ENGINE_set_id(engine, "cryptodev") || 1116 !ENGINE_set_name(engine, "BSD cryptodev engine") || 1117 !ENGINE_set_ciphers(engine, cryptodev_engine_ciphers) || 1118 !ENGINE_set_digests(engine, cryptodev_engine_digests) || 1119 !ENGINE_set_ctrl_function(engine, cryptodev_ctrl) || 1120 !ENGINE_set_cmd_defns(engine, cryptodev_defns)) { 1121 ENGINE_free(engine); 1122 return; 1123 } 1124 1125 if (ENGINE_set_RSA(engine, &cryptodev_rsa)) { 1126 const RSA_METHOD *rsa_meth = RSA_PKCS1_SSLeay(); 1127 1128 cryptodev_rsa.bn_mod_exp = rsa_meth->bn_mod_exp; 1129 cryptodev_rsa.rsa_mod_exp = rsa_meth->rsa_mod_exp; 1130 cryptodev_rsa.rsa_pub_enc = rsa_meth->rsa_pub_enc; 1131 cryptodev_rsa.rsa_pub_dec = rsa_meth->rsa_pub_dec; 1132 cryptodev_rsa.rsa_priv_enc = rsa_meth->rsa_priv_enc; 1133 cryptodev_rsa.rsa_priv_dec = rsa_meth->rsa_priv_dec; 1134 if (cryptodev_asymfeat & CRF_MOD_EXP) { 1135 cryptodev_rsa.bn_mod_exp = cryptodev_bn_mod_exp; 1136 if (cryptodev_asymfeat & CRF_MOD_EXP_CRT) 1137 cryptodev_rsa.rsa_mod_exp = cryptodev_rsa_mod_exp; 1138 else 1139 cryptodev_rsa.rsa_mod_exp = cryptodev_rsa_nocrt_mod_exp; 1140 } 1141 } 1142 1143 if (ENGINE_set_DSA(engine, &cryptodev_dsa)) { 1144 const DSA_METHOD *meth = DSA_OpenSSL(); 1145 1146 memcpy(&cryptodev_dsa, meth, sizeof(DSA_METHOD)); 1147 if (cryptodev_asymfeat & CRF_DSA_SIGN) 1148 cryptodev_dsa.dsa_do_sign = cryptodev_dsa_do_sign; 1149 if (cryptodev_asymfeat & CRF_MOD_EXP) { 1150 cryptodev_dsa.bn_mod_exp = cryptodev_dsa_bn_mod_exp; 1151 cryptodev_dsa.dsa_mod_exp = cryptodev_dsa_dsa_mod_exp; 1152 } 1153 if (cryptodev_asymfeat & CRF_DSA_VERIFY) 1154 cryptodev_dsa.dsa_do_verify = cryptodev_dsa_verify; 1155 } 1156 1157 if (ENGINE_set_DH(engine, &cryptodev_dh)) { 1158 const DH_METHOD *dh_meth = DH_OpenSSL(); 1159 1160 cryptodev_dh.generate_key = dh_meth->generate_key; 1161 cryptodev_dh.compute_key = dh_meth->compute_key; 1162 cryptodev_dh.bn_mod_exp = dh_meth->bn_mod_exp; 1163 if (cryptodev_asymfeat & CRF_MOD_EXP) { 1164 cryptodev_dh.bn_mod_exp = cryptodev_mod_exp_dh; 1165 if (cryptodev_asymfeat & CRF_DH_COMPUTE_KEY) 1166 cryptodev_dh.compute_key = cryptodev_dh_compute_key; 1167 } 1168 } 1169 1170 ENGINE_add(engine); 1171 ENGINE_free(engine); 1172 ERR_clear_error(); 1173} 1174 1175#endif /* HAVE_CRYPTODEV */ 1176