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 /* Try to find an ENGINE which implements this method */ 138 if (e) 139 { 140 if (!ENGINE_init(e)) 141 { 142 EVPerr(EVP_F_INT_CTX_NEW,ERR_R_ENGINE_LIB); 143 return NULL; 144 } 145 } 146 else 147 e = ENGINE_get_pkey_meth_engine(id); 148 149 /* If an ENGINE handled this method look it up. Othewise 150 * use internal tables. 151 */ 152 153 if (e) 154 pmeth = ENGINE_get_pkey_meth(e, id); 155 else 156 #endif 157 pmeth = EVP_PKEY_meth_find(id); 158 159 if (pmeth == NULL) 160 { 161 EVPerr(EVP_F_INT_CTX_NEW,EVP_R_UNSUPPORTED_ALGORITHM); 162 return NULL; 163 } 164 165 ret = OPENSSL_malloc(sizeof(EVP_PKEY_CTX)); 166 if (!ret) 167 { 168 #ifndef OPENSSL_NO_ENGINE 169 if (e) 170 ENGINE_finish(e); 171 #endif 172 EVPerr(EVP_F_INT_CTX_NEW,ERR_R_MALLOC_FAILURE); 173 return NULL; 174 } 175 ret->engine = e; 176 ret->pmeth = pmeth; 177 ret->operation = EVP_PKEY_OP_UNDEFINED; 178 ret->pkey = pkey; 179 ret->peerkey = NULL; 180 ret->pkey_gencb = 0; 181 if (pkey) 182 CRYPTO_add(&pkey->references,1,CRYPTO_LOCK_EVP_PKEY); 183 ret->data = NULL; 184 185 if (pmeth->init) 186 { 187 if (pmeth->init(ret) <= 0) 188 { 189 EVP_PKEY_CTX_free(ret); 190 return NULL; 191 } 192 } 193 194 return ret; 195 } 196 197 EVP_PKEY_METHOD* EVP_PKEY_meth_new(int id, int flags) 198 { 199 EVP_PKEY_METHOD *pmeth; 200 pmeth = OPENSSL_malloc(sizeof(EVP_PKEY_METHOD)); 201 if (!pmeth) 202 return NULL; 203 204 pmeth->pkey_id = id; 205 pmeth->flags = flags | EVP_PKEY_FLAG_DYNAMIC; 206 207 pmeth->init = 0; 208 pmeth->copy = 0; 209 pmeth->cleanup = 0; 210 pmeth->paramgen_init = 0; 211 pmeth->paramgen = 0; 212 pmeth->keygen_init = 0; 213 pmeth->keygen = 0; 214 pmeth->sign_init = 0; 215 pmeth->sign = 0; 216 pmeth->verify_init = 0; 217 pmeth->verify = 0; 218 pmeth->verify_recover_init = 0; 219 pmeth->verify_recover = 0; 220 pmeth->signctx_init = 0; 221 pmeth->signctx = 0; 222 pmeth->verifyctx_init = 0; 223 pmeth->verifyctx = 0; 224 pmeth->encrypt_init = 0; 225 pmeth->encrypt = 0; 226 pmeth->decrypt_init = 0; 227 pmeth->decrypt = 0; 228 pmeth->derive_init = 0; 229 pmeth->derive = 0; 230 pmeth->ctrl = 0; 231 pmeth->ctrl_str = 0; 232 233 return pmeth; 234 } 235 236 void EVP_PKEY_meth_free(EVP_PKEY_METHOD *pmeth) 237 { 238 if (pmeth && (pmeth->flags & EVP_PKEY_FLAG_DYNAMIC)) 239 OPENSSL_free(pmeth); 240 } 241 242 EVP_PKEY_CTX *EVP_PKEY_CTX_new(EVP_PKEY *pkey, ENGINE *e) 243 { 244 return int_ctx_new(pkey, e, -1); 245 } 246 247 EVP_PKEY_CTX *EVP_PKEY_CTX_new_id(int id, ENGINE *e) 248 { 249 return int_ctx_new(NULL, e, id); 250 } 251 252 EVP_PKEY_CTX *EVP_PKEY_CTX_dup(EVP_PKEY_CTX *pctx) 253 { 254 EVP_PKEY_CTX *rctx; 255 if (!pctx->pmeth || !pctx->pmeth->copy) 256 return NULL; 257 #ifndef OPENSSL_NO_ENGINE 258 /* Make sure it's safe to copy a pkey context using an ENGINE */ 259 if (pctx->engine && !ENGINE_init(pctx->engine)) 260 { 261 EVPerr(EVP_F_EVP_PKEY_CTX_DUP,ERR_R_ENGINE_LIB); 262 return 0; 263 } 264 #endif 265 rctx = OPENSSL_malloc(sizeof(EVP_PKEY_CTX)); 266 if (!rctx) 267 return NULL; 268 269 rctx->pmeth = pctx->pmeth; 270 #ifndef OPENSSL_NO_ENGINE 271 rctx->engine = pctx->engine; 272 #endif 273 274 if (pctx->pkey) 275 CRYPTO_add(&pctx->pkey->references,1,CRYPTO_LOCK_EVP_PKEY); 276 277 rctx->pkey = pctx->pkey; 278 279 if (pctx->peerkey) 280 CRYPTO_add(&pctx->peerkey->references,1,CRYPTO_LOCK_EVP_PKEY); 281 282 rctx->peerkey = pctx->peerkey; 283 284 rctx->data = NULL; 285 rctx->app_data = NULL; 286 rctx->operation = pctx->operation; 287 288 if (pctx->pmeth->copy(rctx, pctx) > 0) 289 return rctx; 290 291 EVP_PKEY_CTX_free(rctx); 292 return NULL; 293 294 } 295 296 int EVP_PKEY_meth_add0(const EVP_PKEY_METHOD *pmeth) 297 { 298 if (app_pkey_methods == NULL) 299 { 300 app_pkey_methods = sk_EVP_PKEY_METHOD_new(pmeth_cmp); 301 if (!app_pkey_methods) 302 return 0; 303 } 304 if (!sk_EVP_PKEY_METHOD_push(app_pkey_methods, pmeth)) 305 return 0; 306 sk_EVP_PKEY_METHOD_sort(app_pkey_methods); 307 return 1; 308 } 309 310 void EVP_PKEY_CTX_free(EVP_PKEY_CTX *ctx) 311 { 312 if (ctx == NULL) 313 return; 314 if (ctx->pmeth && ctx->pmeth->cleanup) 315 ctx->pmeth->cleanup(ctx); 316 if (ctx->pkey) 317 EVP_PKEY_free(ctx->pkey); 318 if (ctx->peerkey) 319 EVP_PKEY_free(ctx->peerkey); 320 #ifndef OPENSSL_NO_ENGINE 321 if(ctx->engine) 322 /* The EVP_PKEY_CTX we used belongs to an ENGINE, release the 323 * functional reference we held for this reason. */ 324 ENGINE_finish(ctx->engine); 325 #endif 326 OPENSSL_free(ctx); 327 } 328 329 int EVP_PKEY_CTX_ctrl(EVP_PKEY_CTX *ctx, int keytype, int optype, 330 int cmd, int p1, void *p2) 331 { 332 int ret; 333 if (!ctx || !ctx->pmeth || !ctx->pmeth->ctrl) 334 { 335 EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_COMMAND_NOT_SUPPORTED); 336 return -2; 337 } 338 if ((keytype != -1) && (ctx->pmeth->pkey_id != keytype)) 339 return -1; 340 341 if (ctx->operation == EVP_PKEY_OP_UNDEFINED) 342 { 343 EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_NO_OPERATION_SET); 344 return -1; 345 } 346 347 if ((optype != -1) && !(ctx->operation & optype)) 348 { 349 EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_INVALID_OPERATION); 350 return -1; 351 } 352 353 ret = ctx->pmeth->ctrl(ctx, cmd, p1, p2); 354 355 if (ret == -2) 356 EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_COMMAND_NOT_SUPPORTED); 357 358 return ret; 359 360 } 361 362 int EVP_PKEY_CTX_ctrl_str(EVP_PKEY_CTX *ctx, 363 const char *name, const char *value) 364 { 365 if (!ctx || !ctx->pmeth || !ctx->pmeth->ctrl_str) 366 { 367 EVPerr(EVP_F_EVP_PKEY_CTX_CTRL_STR, 368 EVP_R_COMMAND_NOT_SUPPORTED); 369 return -2; 370 } 371 if (!strcmp(name, "digest")) 372 { 373 const EVP_MD *md; 374 if (!value || !(md = EVP_get_digestbyname(value))) 375 { 376 EVPerr(EVP_F_EVP_PKEY_CTX_CTRL_STR, 377 EVP_R_INVALID_DIGEST); 378 return 0; 379 } 380 return EVP_PKEY_CTX_set_signature_md(ctx, md); 381 } 382 return ctx->pmeth->ctrl_str(ctx, name, value); 383 } 384 385 int EVP_PKEY_CTX_get_operation(EVP_PKEY_CTX *ctx) 386 { 387 return ctx->operation; 388 } 389 390 void EVP_PKEY_CTX_set0_keygen_info(EVP_PKEY_CTX *ctx, int *dat, int datlen) 391 { 392 ctx->keygen_info = dat; 393 ctx->keygen_info_count = datlen; 394 } 395 396 void EVP_PKEY_CTX_set_data(EVP_PKEY_CTX *ctx, void *data) 397 { 398 ctx->data = data; 399 } 400 401 void *EVP_PKEY_CTX_get_data(EVP_PKEY_CTX *ctx) 402 { 403 return ctx->data; 404 } 405 406 EVP_PKEY *EVP_PKEY_CTX_get0_pkey(EVP_PKEY_CTX *ctx) 407 { 408 return ctx->pkey; 409 } 410 411 EVP_PKEY *EVP_PKEY_CTX_get0_peerkey(EVP_PKEY_CTX *ctx) 412 { 413 return ctx->peerkey; 414 } 415 416 void EVP_PKEY_CTX_set_app_data(EVP_PKEY_CTX *ctx, void *data) 417 { 418 ctx->app_data = data; 419 } 420 421 void *EVP_PKEY_CTX_get_app_data(EVP_PKEY_CTX *ctx) 422 { 423 return ctx->app_data; 424 } 425 426 void EVP_PKEY_meth_set_init(EVP_PKEY_METHOD *pmeth, 427 int (*init)(EVP_PKEY_CTX *ctx)) 428 { 429 pmeth->init = init; 430 } 431 432 void EVP_PKEY_meth_set_copy(EVP_PKEY_METHOD *pmeth, 433 int (*copy)(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)) 434 { 435 pmeth->copy = copy; 436 } 437 438 void EVP_PKEY_meth_set_cleanup(EVP_PKEY_METHOD *pmeth, 439 void (*cleanup)(EVP_PKEY_CTX *ctx)) 440 { 441 pmeth->cleanup = cleanup; 442 } 443 444 void EVP_PKEY_meth_set_paramgen(EVP_PKEY_METHOD *pmeth, 445 int (*paramgen_init)(EVP_PKEY_CTX *ctx), 446 int (*paramgen)(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)) 447 { 448 pmeth->paramgen_init = paramgen_init; 449 pmeth->paramgen = paramgen; 450 } 451 452 void EVP_PKEY_meth_set_keygen(EVP_PKEY_METHOD *pmeth, 453 int (*keygen_init)(EVP_PKEY_CTX *ctx), 454 int (*keygen)(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)) 455 { 456 pmeth->keygen_init = keygen_init; 457 pmeth->keygen = keygen; 458 } 459 460 void EVP_PKEY_meth_set_sign(EVP_PKEY_METHOD *pmeth, 461 int (*sign_init)(EVP_PKEY_CTX *ctx), 462 int (*sign)(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen, 463 const unsigned char *tbs, size_t tbslen)) 464 { 465 pmeth->sign_init = sign_init; 466 pmeth->sign = sign; 467 } 468 469 void EVP_PKEY_meth_set_verify(EVP_PKEY_METHOD *pmeth, 470 int (*verify_init)(EVP_PKEY_CTX *ctx), 471 int (*verify)(EVP_PKEY_CTX *ctx, const unsigned char *sig, size_t siglen, 472 const unsigned char *tbs, size_t tbslen)) 473 { 474 pmeth->verify_init = verify_init; 475 pmeth->verify = verify; 476 } 477 478 void EVP_PKEY_meth_set_verify_recover(EVP_PKEY_METHOD *pmeth, 479 int (*verify_recover_init)(EVP_PKEY_CTX *ctx), 480 int (*verify_recover)(EVP_PKEY_CTX *ctx, 481 unsigned char *sig, size_t *siglen, 482 const unsigned char *tbs, size_t tbslen)) 483 { 484 pmeth->verify_recover_init = verify_recover_init; 485 pmeth->verify_recover = verify_recover; 486 } 487 488 void EVP_PKEY_meth_set_signctx(EVP_PKEY_METHOD *pmeth, 489 int (*signctx_init)(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx), 490 int (*signctx)(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen, 491 EVP_MD_CTX *mctx)) 492 { 493 pmeth->signctx_init = signctx_init; 494 pmeth->signctx = signctx; 495 } 496 497 void EVP_PKEY_meth_set_verifyctx(EVP_PKEY_METHOD *pmeth, 498 int (*verifyctx_init)(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx), 499 int (*verifyctx)(EVP_PKEY_CTX *ctx, const unsigned char *sig,int siglen, 500 EVP_MD_CTX *mctx)) 501 { 502 pmeth->verifyctx_init = verifyctx_init; 503 pmeth->verifyctx = verifyctx; 504 } 505 506 void EVP_PKEY_meth_set_encrypt(EVP_PKEY_METHOD *pmeth, 507 int (*encrypt_init)(EVP_PKEY_CTX *ctx), 508 int (*encryptfn)(EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen, 509 const unsigned char *in, size_t inlen)) 510 { 511 pmeth->encrypt_init = encrypt_init; 512 pmeth->encrypt = encryptfn; 513 } 514 515 void EVP_PKEY_meth_set_decrypt(EVP_PKEY_METHOD *pmeth, 516 int (*decrypt_init)(EVP_PKEY_CTX *ctx), 517 int (*decrypt)(EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen, 518 const unsigned char *in, size_t inlen)) 519 { 520 pmeth->decrypt_init = decrypt_init; 521 pmeth->decrypt = decrypt; 522 } 523 524 void EVP_PKEY_meth_set_derive(EVP_PKEY_METHOD *pmeth, 525 int (*derive_init)(EVP_PKEY_CTX *ctx), 526 int (*derive)(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen)) 527 { 528 pmeth->derive_init = derive_init; 529 pmeth->derive = derive; 530 } 531 532 void EVP_PKEY_meth_set_ctrl(EVP_PKEY_METHOD *pmeth, 533 int (*ctrl)(EVP_PKEY_CTX *ctx, int type, int p1, void *p2), 534 int (*ctrl_str)(EVP_PKEY_CTX *ctx, const char *type, const char *value)) 535 { 536 pmeth->ctrl = ctrl; 537 pmeth->ctrl_str = ctrl_str; 538 } 539
