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