crypto/evp/pmeth_lib.c

   1 /* pmeth_lib.c */
   2 /* Written by Dr Stephen N Henson (steve@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@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@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@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         &rsa_pkey_meth,
  81         &dh_pkey_meth,
  82         &dsa_pkey_meth,
  83         &ec_pkey_meth,
  84         &hmac_pkey_meth,
  85         };
  86
  87 DECLARE_OBJ_BSEARCH_CMP_FN(const EVP_PKEY_METHOD *, const EVP_PKEY_METHOD *,
  88                            pmeth);
  89
  90 static int pmeth_cmp(const EVP_PKEY_METHOD * const *a,
  91                      const EVP_PKEY_METHOD * const *b)
  92         {
  93         return ((*a)->pkey_id - (*b)->pkey_id);
  94         }
  95
  96 IMPLEMENT_OBJ_BSEARCH_CMP_FN(const EVP_PKEY_METHOD *, const EVP_PKEY_METHOD *,
  97                              pmeth);
  98
  99 const EVP_PKEY_METHOD *EVP_PKEY_meth_find(int type)
 100         {
 101         EVP_PKEY_METHOD tmp;
 102         const EVP_PKEY_METHOD *t = &tmp, **ret;
 103         tmp.pkey_id = type;
 104         if (app_pkey_methods)
 105                 {
 106                 int idx;
 107                 idx = sk_EVP_PKEY_METHOD_find(app_pkey_methods, &tmp);
 108                 if (idx >= 0)
 109                         return sk_EVP_PKEY_METHOD_value(app_pkey_methods, idx);
 110                 }
 111         ret = OBJ_bsearch_pmeth(&t, standard_methods,
 112                           sizeof(standard_methods)/sizeof(EVP_PKEY_METHOD *));
 113         if (!ret || !*ret)
 114                 return NULL;
 115         return *ret;
 116         }
 117
 118 static EVP_PKEY_CTX *int_ctx_new(EVP_PKEY *pkey, ENGINE *e, int id)
 119         {
 120         EVP_PKEY_CTX *ret;
 121         const EVP_PKEY_METHOD *pmeth;
 122         if (id == -1)
 123                 {
 124                 if (!pkey || !pkey->ameth)
 125                         return NULL;
 126                 id = pkey->ameth->pkey_id;
 127                 }
 128 #ifndef OPENSSL_NO_ENGINE
 129         /* Try to find an ENGINE which implements this method */
 130         if (e)
 131                 {
 132                 if (!ENGINE_init(e))
 133                         {
 134                         EVPerr(EVP_F_INT_CTX_NEW,ERR_R_ENGINE_LIB);
 135                         return NULL;
 136                         }
 137                 }
 138         else
 139                 e = ENGINE_get_pkey_meth_engine(id);
 140
 141         /* If an ENGINE handled this method look it up. Othewise
 142          * use internal tables.
 143          */
 144
 145         if (e)
 146                 pmeth = ENGINE_get_pkey_meth(e, id);
 147         else
 148 #endif
 149                 pmeth = EVP_PKEY_meth_find(id);
 150
 151         if (pmeth == NULL)
 152                 {
 153                 EVPerr(EVP_F_INT_CTX_NEW,EVP_R_UNSUPPORTED_ALGORITHM);
 154                 return NULL;
 155                 }
 156
 157         ret = OPENSSL_malloc(sizeof(EVP_PKEY_CTX));
 158         if (!ret)
 159                 {
 160 #ifndef OPENSSL_NO_ENGINE
 161                 if (e)
 162                         ENGINE_finish(e);
 163 #endif
 164                 EVPerr(EVP_F_INT_CTX_NEW,ERR_R_MALLOC_FAILURE);
 165                 return NULL;
 166                 }
 167         ret->engine = e;
 168         ret->pmeth = pmeth;
 169         ret->operation = EVP_PKEY_OP_UNDEFINED;
 170         ret->pkey = pkey;
 171         ret->peerkey = NULL;
 172         if (pkey)
 173                 CRYPTO_add(&pkey->references,1,CRYPTO_LOCK_EVP_PKEY);
 174         ret->data = NULL;
 175
 176         if (pmeth->init)
 177                 {
 178                 if (pmeth->init(ret) <= 0)
 179                         {
 180                         EVP_PKEY_CTX_free(ret);
 181                         return NULL;
 182                         }
 183                 }
 184
 185         return ret;
 186         }
 187
 188 EVP_PKEY_METHOD* EVP_PKEY_meth_new(int id, int flags)
 189         {
 190         EVP_PKEY_METHOD *pmeth;
 191         pmeth = OPENSSL_malloc(sizeof(EVP_PKEY_METHOD));
 192         if (!pmeth)
 193                 return NULL;
 194
 195         pmeth->pkey_id = id;
 196         pmeth->flags = flags | EVP_PKEY_FLAG_DYNAMIC;
 197
 198         pmeth->init = 0;
 199         pmeth->copy = 0;
 200         pmeth->cleanup = 0;
 201         pmeth->paramgen_init = 0;
 202         pmeth->paramgen = 0;
 203         pmeth->keygen_init = 0;
 204         pmeth->keygen = 0;
 205         pmeth->sign_init = 0;
 206         pmeth->sign = 0;
 207         pmeth->verify_init = 0;
 208         pmeth->verify = 0;
 209         pmeth->verify_recover_init = 0;
 210         pmeth->verify_recover = 0;
 211         pmeth->signctx_init = 0;
 212         pmeth->signctx = 0;
 213         pmeth->verifyctx_init = 0;
 214         pmeth->verifyctx = 0;
 215         pmeth->encrypt_init = 0;
 216         pmeth->encrypt = 0;
 217         pmeth->decrypt_init = 0;
 218         pmeth->decrypt = 0;
 219         pmeth->derive_init = 0;
 220         pmeth->derive = 0;
 221         pmeth->ctrl = 0;
 222         pmeth->ctrl_str = 0;
 223
 224         return pmeth;
 225         }
 226
 227 void EVP_PKEY_meth_free(EVP_PKEY_METHOD *pmeth)
 228         {
 229         if (pmeth && (pmeth->flags & EVP_PKEY_FLAG_DYNAMIC))
 230                 OPENSSL_free(pmeth);
 231         }
 232
 233 EVP_PKEY_CTX *EVP_PKEY_CTX_new(EVP_PKEY *pkey, ENGINE *e)
 234         {
 235         return int_ctx_new(pkey, e, -1);
 236         }
 237
 238 EVP_PKEY_CTX *EVP_PKEY_CTX_new_id(int id, ENGINE *e)
 239         {
 240         return int_ctx_new(NULL, e, id);
 241         }
 242
 243 EVP_PKEY_CTX *EVP_PKEY_CTX_dup(EVP_PKEY_CTX *pctx)
 244         {
 245         EVP_PKEY_CTX *rctx;
 246         if (!pctx->pmeth || !pctx->pmeth->copy)
 247                 return NULL;
 248 #ifndef OPENSSL_NO_ENGINE
 249         /* Make sure it's safe to copy a pkey context using an ENGINE */
 250         if (pctx->engine && !ENGINE_init(pctx->engine))
 251                 {
 252                 EVPerr(EVP_F_EVP_PKEY_CTX_DUP,ERR_R_ENGINE_LIB);
 253                 return 0;
 254                 }
 255 #endif
 256         rctx = OPENSSL_malloc(sizeof(EVP_PKEY_CTX));
 257         if (!rctx)
 258                 return NULL;
 259
 260         rctx->pmeth = pctx->pmeth;
 261 #ifndef OPENSSL_NO_ENGINE
 262         rctx->engine = pctx->engine;
 263 #endif
 264
 265         if (pctx->pkey)
 266                 CRYPTO_add(&pctx->pkey->references,1,CRYPTO_LOCK_EVP_PKEY);
 267
 268         rctx->pkey = pctx->pkey;
 269
 270         if (pctx->peerkey)
 271                 CRYPTO_add(&pctx->peerkey->references,1,CRYPTO_LOCK_EVP_PKEY);
 272
 273         rctx->peerkey = pctx->peerkey;
 274
 275         rctx->data = NULL;
 276         rctx->app_data = NULL;
 277         rctx->operation = pctx->operation;
 278
 279         if (pctx->pmeth->copy(rctx, pctx) > 0)
 280                 return rctx;
 281
 282         EVP_PKEY_CTX_free(rctx);
 283         return NULL;
 284
 285         }
 286
 287 int EVP_PKEY_meth_add0(const EVP_PKEY_METHOD *pmeth)
 288         {
 289         if (app_pkey_methods == NULL)
 290                 {
 291                 app_pkey_methods = sk_EVP_PKEY_METHOD_new(pmeth_cmp);
 292                 if (!app_pkey_methods)
 293                         return 0;
 294                 }
 295         if (!sk_EVP_PKEY_METHOD_push(app_pkey_methods, pmeth))
 296                 return 0;
 297         sk_EVP_PKEY_METHOD_sort(app_pkey_methods);
 298         return 1;
 299         }
 300
 301 void EVP_PKEY_CTX_free(EVP_PKEY_CTX *ctx)
 302         {
 303         if (ctx == NULL)
 304                 return;
 305         if (ctx->pmeth && ctx->pmeth->cleanup)
 306                 ctx->pmeth->cleanup(ctx);
 307         if (ctx->pkey)
 308                 EVP_PKEY_free(ctx->pkey);
 309         if (ctx->peerkey)
 310                 EVP_PKEY_free(ctx->peerkey);
 311 #ifndef OPENSSL_NO_ENGINE
 312         if(ctx->engine)
 313                 /* The EVP_PKEY_CTX we used belongs to an ENGINE, release the
 314                  * functional reference we held for this reason. */
 315                 ENGINE_finish(ctx->engine);
 316 #endif
 317         OPENSSL_free(ctx);
 318         }
 319
 320 int EVP_PKEY_CTX_ctrl(EVP_PKEY_CTX *ctx, int keytype, int optype,
 321                                 int cmd, int p1, void *p2)
 322         {
 323         int ret;
 324         if (!ctx || !ctx->pmeth || !ctx->pmeth->ctrl)
 325                 {
 326                 EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_COMMAND_NOT_SUPPORTED);
 327                 return -2;
 328                 }
 329         if ((keytype != -1) && (ctx->pmeth->pkey_id != keytype))
 330                 return -1;
 331
 332         if (ctx->operation == EVP_PKEY_OP_UNDEFINED)
 333                 {
 334                 EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_NO_OPERATION_SET);
 335                 return -1;
 336                 }
 337
 338         if ((optype != -1) && !(ctx->operation & optype))
 339                 {
 340                 EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_INVALID_OPERATION);
 341                 return -1;
 342                 }
 343
 344         ret = ctx->pmeth->ctrl(ctx, cmd, p1, p2);
 345
 346         if (ret == -2)
 347                 EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_COMMAND_NOT_SUPPORTED);
 348
 349         return ret;
 350
 351         }
 352
 353 int EVP_PKEY_CTX_ctrl_str(EVP_PKEY_CTX *ctx,
 354                                         const char *name, const char *value)
 355         {
 356         if (!ctx || !ctx->pmeth || !ctx->pmeth->ctrl_str)
 357                 {
 358                 EVPerr(EVP_F_EVP_PKEY_CTX_CTRL_STR,
 359                                                 EVP_R_COMMAND_NOT_SUPPORTED);
 360                 return -2;
 361                 }
 362         if (!strcmp(name, "digest"))
 363                 {
 364                 const EVP_MD *md;
 365                 if (!value || !(md = EVP_get_digestbyname(value)))
 366                         {
 367                         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL_STR,
 368                                                 EVP_R_INVALID_DIGEST);
 369                         return 0;
 370                         }
 371                 return EVP_PKEY_CTX_set_signature_md(ctx, md);
 372                 }
 373         return ctx->pmeth->ctrl_str(ctx, name, value);
 374         }
 375
 376 int EVP_PKEY_CTX_get_operation(EVP_PKEY_CTX *ctx)
 377         {
 378         return ctx->operation;
 379         }
 380
 381 void EVP_PKEY_CTX_set0_keygen_info(EVP_PKEY_CTX *ctx, int *dat, int datlen)
 382         {
 383         ctx->keygen_info = dat;
 384         ctx->keygen_info_count = datlen;
 385         }
 386
 387 void EVP_PKEY_CTX_set_data(EVP_PKEY_CTX *ctx, void *data)
 388         {
 389         ctx->data = data;
 390         }
 391
 392 void *EVP_PKEY_CTX_get_data(EVP_PKEY_CTX *ctx)
 393         {
 394         return ctx->data;
 395         }
 396
 397 EVP_PKEY *EVP_PKEY_CTX_get0_pkey(EVP_PKEY_CTX *ctx)
 398         {
 399         return ctx->pkey;
 400         }
 401
 402 EVP_PKEY *EVP_PKEY_CTX_get0_peerkey(EVP_PKEY_CTX *ctx)
 403         {
 404         return ctx->peerkey;
 405         }
 406
 407 void EVP_PKEY_CTX_set_app_data(EVP_PKEY_CTX *ctx, void *data)
 408         {
 409         ctx->app_data = data;
 410         }
 411
 412 void *EVP_PKEY_CTX_get_app_data(EVP_PKEY_CTX *ctx)
 413         {
 414         return ctx->app_data;
 415         }
 416
 417 void EVP_PKEY_meth_set_init(EVP_PKEY_METHOD *pmeth,
 418         int (*init)(EVP_PKEY_CTX *ctx))
 419         {
 420         pmeth->init = init;
 421         }
 422
 423 void EVP_PKEY_meth_set_copy(EVP_PKEY_METHOD *pmeth,
 424         int (*copy)(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src))
 425         {
 426         pmeth->copy = copy;
 427         }
 428
 429 void EVP_PKEY_meth_set_cleanup(EVP_PKEY_METHOD *pmeth,
 430         void (*cleanup)(EVP_PKEY_CTX *ctx))
 431         {
 432         pmeth->cleanup = cleanup;
 433         }
 434
 435 void EVP_PKEY_meth_set_paramgen(EVP_PKEY_METHOD *pmeth,
 436         int (*paramgen_init)(EVP_PKEY_CTX *ctx),
 437         int (*paramgen)(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey))
 438         {
 439         pmeth->paramgen_init = paramgen_init;
 440         pmeth->paramgen = paramgen;
 441         }
 442
 443 void EVP_PKEY_meth_set_keygen(EVP_PKEY_METHOD *pmeth,
 444         int (*keygen_init)(EVP_PKEY_CTX *ctx),
 445         int (*keygen)(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey))
 446         {
 447         pmeth->keygen_init = keygen_init;
 448         pmeth->keygen = keygen;
 449         }
 450
 451 void EVP_PKEY_meth_set_sign(EVP_PKEY_METHOD *pmeth,
 452         int (*sign_init)(EVP_PKEY_CTX *ctx),
 453         int (*sign)(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
 454                                         const unsigned char *tbs, size_t tbslen))
 455         {
 456         pmeth->sign_init = sign_init;
 457         pmeth->sign = sign;
 458         }
 459
 460 void EVP_PKEY_meth_set_verify(EVP_PKEY_METHOD *pmeth,
 461         int (*verify_init)(EVP_PKEY_CTX *ctx),
 462         int (*verify)(EVP_PKEY_CTX *ctx, const unsigned char *sig, size_t siglen,
 463                                         const unsigned char *tbs, size_t tbslen))
 464         {
 465         pmeth->verify_init = verify_init;
 466         pmeth->verify = verify;
 467         }
 468
 469 void EVP_PKEY_meth_set_verify_recover(EVP_PKEY_METHOD *pmeth,
 470         int (*verify_recover_init)(EVP_PKEY_CTX *ctx),
 471         int (*verify_recover)(EVP_PKEY_CTX *ctx,
 472                                         unsigned char *sig, size_t *siglen,
 473                                         const unsigned char *tbs, size_t tbslen))
 474         {
 475         pmeth->verify_recover_init = verify_recover_init;
 476         pmeth->verify_recover = verify_recover;
 477         }
 478
 479 void EVP_PKEY_meth_set_signctx(EVP_PKEY_METHOD *pmeth,
 480         int (*signctx_init)(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx),
 481         int (*signctx)(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
 482                                         EVP_MD_CTX *mctx))
 483         {
 484         pmeth->signctx_init = signctx_init;
 485         pmeth->signctx = signctx;
 486         }
 487
 488 void EVP_PKEY_meth_set_verifyctx(EVP_PKEY_METHOD *pmeth,
 489         int (*verifyctx_init)(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx),
 490         int (*verifyctx)(EVP_PKEY_CTX *ctx, const unsigned char *sig,int siglen,
 491                                         EVP_MD_CTX *mctx))
 492         {
 493         pmeth->verifyctx_init = verifyctx_init;
 494         pmeth->verifyctx = verifyctx;
 495         }
 496
 497 void EVP_PKEY_meth_set_encrypt(EVP_PKEY_METHOD *pmeth,
 498         int (*encrypt_init)(EVP_PKEY_CTX *ctx),
 499         int (*encryptfn)(EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen,
 500                                         const unsigned char *in, size_t inlen))
 501         {
 502         pmeth->encrypt_init = encrypt_init;
 503         pmeth->encrypt = encryptfn;
 504         }
 505
 506 void EVP_PKEY_meth_set_decrypt(EVP_PKEY_METHOD *pmeth,
 507         int (*decrypt_init)(EVP_PKEY_CTX *ctx),
 508         int (*decrypt)(EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen,
 509                                         const unsigned char *in, size_t inlen))
 510         {
 511         pmeth->decrypt_init = decrypt_init;
 512         pmeth->decrypt = decrypt;
 513         }
 514
 515 void EVP_PKEY_meth_set_derive(EVP_PKEY_METHOD *pmeth,
 516         int (*derive_init)(EVP_PKEY_CTX *ctx),
 517         int (*derive)(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen))
 518         {
 519         pmeth->derive_init = derive_init;
 520         pmeth->derive = derive;
 521         }
 522
 523 void EVP_PKEY_meth_set_ctrl(EVP_PKEY_METHOD *pmeth,
 524         int (*ctrl)(EVP_PKEY_CTX *ctx, int type, int p1, void *p2),
 525         int (*ctrl_str)(EVP_PKEY_CTX *ctx, const char *type, const char *value))
 526         {
 527         pmeth->ctrl = ctrl;
 528         pmeth->ctrl_str = ctrl_str;
 529         }