1 /* pmeth_lib.c */ 2 /* Written by Dr Stephen N Henson (steve (at) openssl.org) for the OpenSSL 3 * project 2006. 4 */ 5 /* ==================================================================== 6 * Copyright (c) 2006 The OpenSSL Project. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 20 * 3. All advertising materials mentioning features or use of this 21 * software must display the following acknowledgment: 22 * "This product includes software developed by the OpenSSL Project 23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 24 * 25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26 * endorse or promote products derived from this software without 27 * prior written permission. For written permission, please contact 28 * licensing (at) OpenSSL.org. 29 * 30 * 5. Products derived from this software may not be called "OpenSSL" 31 * nor may "OpenSSL" appear in their names without prior written 32 * permission of the OpenSSL Project. 33 * 34 * 6. Redistributions of any form whatsoever must retain the following 35 * acknowledgment: 36 * "This product includes software developed by the OpenSSL Project 37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 38 * 39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50 * OF THE POSSIBILITY OF SUCH DAMAGE. 51 * ==================================================================== 52 * 53 * This product includes cryptographic software written by Eric Young 54 * (eay (at) cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh (at) cryptsoft.com). 56 * 57 */ 58 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include "cryptlib.h" 62 #include <openssl/objects.h> 63 #include <openssl/evp.h> 64 #ifndef OPENSSL_NO_ENGINE 65 #include <openssl/engine.h> 66 #endif 67 #include "asn1_locl.h" 68 #include "evp_locl.h" 69 70 typedef int sk_cmp_fn_type(const char * const *a, const char * const *b); 71 72 DECLARE_STACK_OF(EVP_PKEY_METHOD) 73 STACK_OF(EVP_PKEY_METHOD) *app_pkey_methods = NULL; 74 75 extern const EVP_PKEY_METHOD rsa_pkey_meth, dh_pkey_meth, dsa_pkey_meth; 76 extern const EVP_PKEY_METHOD ec_pkey_meth, hmac_pkey_meth; 77 78 static const EVP_PKEY_METHOD *standard_methods[] = 79 { 80 #ifndef OPENSSL_NO_RSA 81 &rsa_pkey_meth, 82 #endif 83 #ifndef OPENSSL_NO_DH 84 &dh_pkey_meth, 85 #endif 86 #ifndef OPENSSL_NO_DSA 87 &dsa_pkey_meth, 88 #endif 89 #ifndef OPENSSL_NO_EC 90 &ec_pkey_meth, 91 #endif 92 &hmac_pkey_meth, 93 }; 94 95 DECLARE_OBJ_BSEARCH_CMP_FN(const EVP_PKEY_METHOD *, const EVP_PKEY_METHOD *, 96 pmeth); 97 98 static int pmeth_cmp(const EVP_PKEY_METHOD * const *a, 99 const EVP_PKEY_METHOD * const *b) 100 { 101 return ((*a)->pkey_id - (*b)->pkey_id); 102 } 103 104 IMPLEMENT_OBJ_BSEARCH_CMP_FN(const EVP_PKEY_METHOD *, const EVP_PKEY_METHOD *, 105 pmeth); 106 107 const EVP_PKEY_METHOD *EVP_PKEY_meth_find(int type) 108 { 109 EVP_PKEY_METHOD tmp; 110 const EVP_PKEY_METHOD *t = &tmp, **ret; 111 tmp.pkey_id = type; 112 if (app_pkey_methods) 113 { 114 int idx; 115 idx = sk_EVP_PKEY_METHOD_find(app_pkey_methods, &tmp); 116 if (idx >= 0) 117 return sk_EVP_PKEY_METHOD_value(app_pkey_methods, idx); 118 } 119 ret = OBJ_bsearch_pmeth(&t, standard_methods, 120 sizeof(standard_methods)/sizeof(EVP_PKEY_METHOD *)); 121 if (!ret || !*ret) 122 return NULL; 123 return *ret; 124 } 125 126 static EVP_PKEY_CTX *int_ctx_new(EVP_PKEY *pkey, ENGINE *e, int id) 127 { 128 EVP_PKEY_CTX *ret; 129 const EVP_PKEY_METHOD *pmeth; 130 if (id == -1) 131 { 132 if (!pkey || !pkey->ameth) 133 return NULL; 134 id = pkey->ameth->pkey_id; 135 } 136 #ifndef OPENSSL_NO_ENGINE 137 if (pkey && pkey->engine) 138 e = pkey->engine; 139 /* Try to find an ENGINE which implements this method */ 140 if (e) 141 { 142 if (!ENGINE_init(e)) 143 { 144 EVPerr(EVP_F_INT_CTX_NEW,ERR_R_ENGINE_LIB); 145 return NULL; 146 } 147 } 148 else 149 e = ENGINE_get_pkey_meth_engine(id); 150 151 /* If an ENGINE handled this method look it up. Othewise 152 * use internal tables. 153 */ 154 155 if (e) 156 pmeth = ENGINE_get_pkey_meth(e, id); 157 else 158 #endif 159 pmeth = EVP_PKEY_meth_find(id); 160 161 if (pmeth == NULL) 162 { 163 EVPerr(EVP_F_INT_CTX_NEW,EVP_R_UNSUPPORTED_ALGORITHM); 164 return NULL; 165 } 166 167 ret = OPENSSL_malloc(sizeof(EVP_PKEY_CTX)); 168 if (!ret) 169 { 170 #ifndef OPENSSL_NO_ENGINE 171 if (e) 172 ENGINE_finish(e); 173 #endif 174 EVPerr(EVP_F_INT_CTX_NEW,ERR_R_MALLOC_FAILURE); 175 return NULL; 176 } 177 ret->engine = e; 178 ret->pmeth = pmeth; 179 ret->operation = EVP_PKEY_OP_UNDEFINED; 180 ret->pkey = pkey; 181 ret->peerkey = NULL; 182 ret->pkey_gencb = 0; 183 if (pkey) 184 CRYPTO_add(&pkey->references,1,CRYPTO_LOCK_EVP_PKEY); 185 ret->data = NULL; 186 187 if (pmeth->init) 188 { 189 if (pmeth->init(ret) <= 0) 190 { 191 EVP_PKEY_CTX_free(ret); 192 return NULL; 193 } 194 } 195 196 return ret; 197 } 198 199 EVP_PKEY_METHOD* EVP_PKEY_meth_new(int id, int flags) 200 { 201 EVP_PKEY_METHOD *pmeth; 202 pmeth = OPENSSL_malloc(sizeof(EVP_PKEY_METHOD)); 203 if (!pmeth) 204 return NULL; 205 206 pmeth->pkey_id = id; 207 pmeth->flags = flags | EVP_PKEY_FLAG_DYNAMIC; 208 209 pmeth->init = 0; 210 pmeth->copy = 0; 211 pmeth->cleanup = 0; 212 pmeth->paramgen_init = 0; 213 pmeth->paramgen = 0; 214 pmeth->keygen_init = 0; 215 pmeth->keygen = 0; 216 pmeth->sign_init = 0; 217 pmeth->sign = 0; 218 pmeth->verify_init = 0; 219 pmeth->verify = 0; 220 pmeth->verify_recover_init = 0; 221 pmeth->verify_recover = 0; 222 pmeth->signctx_init = 0; 223 pmeth->signctx = 0; 224 pmeth->verifyctx_init = 0; 225 pmeth->verifyctx = 0; 226 pmeth->encrypt_init = 0; 227 pmeth->encrypt = 0; 228 pmeth->decrypt_init = 0; 229 pmeth->decrypt = 0; 230 pmeth->derive_init = 0; 231 pmeth->derive = 0; 232 pmeth->ctrl = 0; 233 pmeth->ctrl_str = 0; 234 235 return pmeth; 236 } 237 238 void EVP_PKEY_meth_free(EVP_PKEY_METHOD *pmeth) 239 { 240 if (pmeth && (pmeth->flags & EVP_PKEY_FLAG_DYNAMIC)) 241 OPENSSL_free(pmeth); 242 } 243 244 EVP_PKEY_CTX *EVP_PKEY_CTX_new(EVP_PKEY *pkey, ENGINE *e) 245 { 246 return int_ctx_new(pkey, e, -1); 247 } 248 249 EVP_PKEY_CTX *EVP_PKEY_CTX_new_id(int id, ENGINE *e) 250 { 251 return int_ctx_new(NULL, e, id); 252 } 253 254 EVP_PKEY_CTX *EVP_PKEY_CTX_dup(EVP_PKEY_CTX *pctx) 255 { 256 EVP_PKEY_CTX *rctx; 257 if (!pctx->pmeth || !pctx->pmeth->copy) 258 return NULL; 259 #ifndef OPENSSL_NO_ENGINE 260 /* Make sure it's safe to copy a pkey context using an ENGINE */ 261 if (pctx->engine && !ENGINE_init(pctx->engine)) 262 { 263 EVPerr(EVP_F_EVP_PKEY_CTX_DUP,ERR_R_ENGINE_LIB); 264 return 0; 265 } 266 #endif 267 rctx = OPENSSL_malloc(sizeof(EVP_PKEY_CTX)); 268 if (!rctx) 269 return NULL; 270 271 rctx->pmeth = pctx->pmeth; 272 #ifndef OPENSSL_NO_ENGINE 273 rctx->engine = pctx->engine; 274 #endif 275 276 if (pctx->pkey) 277 CRYPTO_add(&pctx->pkey->references,1,CRYPTO_LOCK_EVP_PKEY); 278 279 rctx->pkey = pctx->pkey; 280 281 if (pctx->peerkey) 282 CRYPTO_add(&pctx->peerkey->references,1,CRYPTO_LOCK_EVP_PKEY); 283 284 rctx->peerkey = pctx->peerkey; 285 286 rctx->data = NULL; 287 rctx->app_data = NULL; 288 rctx->operation = pctx->operation; 289 290 if (pctx->pmeth->copy(rctx, pctx) > 0) 291 return rctx; 292 293 EVP_PKEY_CTX_free(rctx); 294 return NULL; 295 296 } 297 298 int EVP_PKEY_meth_add0(const EVP_PKEY_METHOD *pmeth) 299 { 300 if (app_pkey_methods == NULL) 301 { 302 app_pkey_methods = sk_EVP_PKEY_METHOD_new(pmeth_cmp); 303 if (!app_pkey_methods) 304 return 0; 305 } 306 if (!sk_EVP_PKEY_METHOD_push(app_pkey_methods, pmeth)) 307 return 0; 308 sk_EVP_PKEY_METHOD_sort(app_pkey_methods); 309 return 1; 310 } 311 312 void EVP_PKEY_CTX_free(EVP_PKEY_CTX *ctx) 313 { 314 if (ctx == NULL) 315 return; 316 if (ctx->pmeth && ctx->pmeth->cleanup) 317 ctx->pmeth->cleanup(ctx); 318 if (ctx->pkey) 319 EVP_PKEY_free(ctx->pkey); 320 if (ctx->peerkey) 321 EVP_PKEY_free(ctx->peerkey); 322 #ifndef OPENSSL_NO_ENGINE 323 if(ctx->engine) 324 /* The EVP_PKEY_CTX we used belongs to an ENGINE, release the 325 * functional reference we held for this reason. */ 326 ENGINE_finish(ctx->engine); 327 #endif 328 OPENSSL_free(ctx); 329 } 330 331 int EVP_PKEY_CTX_ctrl(EVP_PKEY_CTX *ctx, int keytype, int optype, 332 int cmd, int p1, void *p2) 333 { 334 int ret; 335 if (!ctx || !ctx->pmeth || !ctx->pmeth->ctrl) 336 { 337 EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_COMMAND_NOT_SUPPORTED); 338 return -2; 339 } 340 if ((keytype != -1) && (ctx->pmeth->pkey_id != keytype)) 341 return -1; 342 343 if (ctx->operation == EVP_PKEY_OP_UNDEFINED) 344 { 345 EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_NO_OPERATION_SET); 346 return -1; 347 } 348 349 if ((optype != -1) && !(ctx->operation & optype)) 350 { 351 EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_INVALID_OPERATION); 352 return -1; 353 } 354 355 ret = ctx->pmeth->ctrl(ctx, cmd, p1, p2); 356 357 if (ret == -2) 358 EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_COMMAND_NOT_SUPPORTED); 359 360 return ret; 361 362 } 363 364 int EVP_PKEY_CTX_ctrl_str(EVP_PKEY_CTX *ctx, 365 const char *name, const char *value) 366 { 367 if (!ctx || !ctx->pmeth || !ctx->pmeth->ctrl_str) 368 { 369 EVPerr(EVP_F_EVP_PKEY_CTX_CTRL_STR, 370 EVP_R_COMMAND_NOT_SUPPORTED); 371 return -2; 372 } 373 if (!strcmp(name, "digest")) 374 { 375 const EVP_MD *md; 376 if (!value || !(md = EVP_get_digestbyname(value))) 377 { 378 EVPerr(EVP_F_EVP_PKEY_CTX_CTRL_STR, 379 EVP_R_INVALID_DIGEST); 380 return 0; 381 } 382 return EVP_PKEY_CTX_set_signature_md(ctx, md); 383 } 384 return ctx->pmeth->ctrl_str(ctx, name, value); 385 } 386 387 int EVP_PKEY_CTX_get_operation(EVP_PKEY_CTX *ctx) 388 { 389 return ctx->operation; 390 } 391 392 void EVP_PKEY_CTX_set0_keygen_info(EVP_PKEY_CTX *ctx, int *dat, int datlen) 393 { 394 ctx->keygen_info = dat; 395 ctx->keygen_info_count = datlen; 396 } 397 398 void EVP_PKEY_CTX_set_data(EVP_PKEY_CTX *ctx, void *data) 399 { 400 ctx->data = data; 401 } 402 403 void *EVP_PKEY_CTX_get_data(EVP_PKEY_CTX *ctx) 404 { 405 return ctx->data; 406 } 407 408 EVP_PKEY *EVP_PKEY_CTX_get0_pkey(EVP_PKEY_CTX *ctx) 409 { 410 return ctx->pkey; 411 } 412 413 EVP_PKEY *EVP_PKEY_CTX_get0_peerkey(EVP_PKEY_CTX *ctx) 414 { 415 return ctx->peerkey; 416 } 417 418 void EVP_PKEY_CTX_set_app_data(EVP_PKEY_CTX *ctx, void *data) 419 { 420 ctx->app_data = data; 421 } 422 423 void *EVP_PKEY_CTX_get_app_data(EVP_PKEY_CTX *ctx) 424 { 425 return ctx->app_data; 426 } 427 428 void EVP_PKEY_meth_set_init(EVP_PKEY_METHOD *pmeth, 429 int (*init)(EVP_PKEY_CTX *ctx)) 430 { 431 pmeth->init = init; 432 } 433 434 void EVP_PKEY_meth_set_copy(EVP_PKEY_METHOD *pmeth, 435 int (*copy)(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)) 436 { 437 pmeth->copy = copy; 438 } 439 440 void EVP_PKEY_meth_set_cleanup(EVP_PKEY_METHOD *pmeth, 441 void (*cleanup)(EVP_PKEY_CTX *ctx)) 442 { 443 pmeth->cleanup = cleanup; 444 } 445 446 void EVP_PKEY_meth_set_paramgen(EVP_PKEY_METHOD *pmeth, 447 int (*paramgen_init)(EVP_PKEY_CTX *ctx), 448 int (*paramgen)(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)) 449 { 450 pmeth->paramgen_init = paramgen_init; 451 pmeth->paramgen = paramgen; 452 } 453 454 void EVP_PKEY_meth_set_keygen(EVP_PKEY_METHOD *pmeth, 455 int (*keygen_init)(EVP_PKEY_CTX *ctx), 456 int (*keygen)(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)) 457 { 458 pmeth->keygen_init = keygen_init; 459 pmeth->keygen = keygen; 460 } 461 462 void EVP_PKEY_meth_set_sign(EVP_PKEY_METHOD *pmeth, 463 int (*sign_init)(EVP_PKEY_CTX *ctx), 464 int (*sign)(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen, 465 const unsigned char *tbs, size_t tbslen)) 466 { 467 pmeth->sign_init = sign_init; 468 pmeth->sign = sign; 469 } 470 471 void EVP_PKEY_meth_set_verify(EVP_PKEY_METHOD *pmeth, 472 int (*verify_init)(EVP_PKEY_CTX *ctx), 473 int (*verify)(EVP_PKEY_CTX *ctx, const unsigned char *sig, size_t siglen, 474 const unsigned char *tbs, size_t tbslen)) 475 { 476 pmeth->verify_init = verify_init; 477 pmeth->verify = verify; 478 } 479 480 void EVP_PKEY_meth_set_verify_recover(EVP_PKEY_METHOD *pmeth, 481 int (*verify_recover_init)(EVP_PKEY_CTX *ctx), 482 int (*verify_recover)(EVP_PKEY_CTX *ctx, 483 unsigned char *sig, size_t *siglen, 484 const unsigned char *tbs, size_t tbslen)) 485 { 486 pmeth->verify_recover_init = verify_recover_init; 487 pmeth->verify_recover = verify_recover; 488 } 489 490 void EVP_PKEY_meth_set_signctx(EVP_PKEY_METHOD *pmeth, 491 int (*signctx_init)(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx), 492 int (*signctx)(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen, 493 EVP_MD_CTX *mctx)) 494 { 495 pmeth->signctx_init = signctx_init; 496 pmeth->signctx = signctx; 497 } 498 499 void EVP_PKEY_meth_set_verifyctx(EVP_PKEY_METHOD *pmeth, 500 int (*verifyctx_init)(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx), 501 int (*verifyctx)(EVP_PKEY_CTX *ctx, const unsigned char *sig,int siglen, 502 EVP_MD_CTX *mctx)) 503 { 504 pmeth->verifyctx_init = verifyctx_init; 505 pmeth->verifyctx = verifyctx; 506 } 507 508 void EVP_PKEY_meth_set_encrypt(EVP_PKEY_METHOD *pmeth, 509 int (*encrypt_init)(EVP_PKEY_CTX *ctx), 510 int (*encryptfn)(EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen, 511 const unsigned char *in, size_t inlen)) 512 { 513 pmeth->encrypt_init = encrypt_init; 514 pmeth->encrypt = encryptfn; 515 } 516 517 void EVP_PKEY_meth_set_decrypt(EVP_PKEY_METHOD *pmeth, 518 int (*decrypt_init)(EVP_PKEY_CTX *ctx), 519 int (*decrypt)(EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen, 520 const unsigned char *in, size_t inlen)) 521 { 522 pmeth->decrypt_init = decrypt_init; 523 pmeth->decrypt = decrypt; 524 } 525 526 void EVP_PKEY_meth_set_derive(EVP_PKEY_METHOD *pmeth, 527 int (*derive_init)(EVP_PKEY_CTX *ctx), 528 int (*derive)(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen)) 529 { 530 pmeth->derive_init = derive_init; 531 pmeth->derive = derive; 532 } 533 534 void EVP_PKEY_meth_set_ctrl(EVP_PKEY_METHOD *pmeth, 535 int (*ctrl)(EVP_PKEY_CTX *ctx, int type, int p1, void *p2), 536 int (*ctrl_str)(EVP_PKEY_CTX *ctx, const char *type, const char *value)) 537 { 538 pmeth->ctrl = ctrl; 539 pmeth->ctrl_str = ctrl_str; 540 } 541
