crypto/evp/pmeth_lib.c

   1 /* pmeth_lib.c */
   2 /*
   3  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
   4  * 2006.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    licensing@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59
  60 #include <stdio.h>
  61 #include <stdlib.h>
  62 #include "internal/cryptlib.h"
  63 #include <openssl/objects.h>
  64 #include <openssl/evp.h>
  65 #ifndef OPENSSL_NO_ENGINE
  66 # include <openssl/engine.h>
  67 #endif
  68 #include "internal/asn1_int.h"
  69 #include "internal/evp_int.h"
  70
  71 typedef int sk_cmp_fn_type(const char *const *a, const char *const *b);
  72
  73 DECLARE_STACK_OF(EVP_PKEY_METHOD)
  74 STACK_OF(EVP_PKEY_METHOD) *app_pkey_methods = NULL;
  75
  76 extern const EVP_PKEY_METHOD rsa_pkey_meth, dh_pkey_meth, dsa_pkey_meth;
  77 extern const EVP_PKEY_METHOD ec_pkey_meth, hmac_pkey_meth, cmac_pkey_meth;
  78 extern const EVP_PKEY_METHOD dhx_pkey_meth;
  79
  80 static const EVP_PKEY_METHOD *standard_methods[] = {
  81 #ifndef OPENSSL_NO_RSA
  82     &rsa_pkey_meth,
  83 #endif
  84 #ifndef OPENSSL_NO_DH
  85     &dh_pkey_meth,
  86 #endif
  87 #ifndef OPENSSL_NO_DSA
  88     &dsa_pkey_meth,
  89 #endif
  90 #ifndef OPENSSL_NO_EC
  91     &ec_pkey_meth,
  92 #endif
  93     &hmac_pkey_meth,
  94     &cmac_pkey_meth,
  95 #ifndef OPENSSL_NO_DH
  96     &dhx_pkey_meth
  97 #endif
  98 };
  99
 100 DECLARE_OBJ_BSEARCH_CMP_FN(const EVP_PKEY_METHOD *, const EVP_PKEY_METHOD *,
 101                            pmeth);
 102
 103 static int pmeth_cmp(const EVP_PKEY_METHOD *const *a,
 104                      const EVP_PKEY_METHOD *const *b)
 105 {
 106     return ((*a)->pkey_id - (*b)->pkey_id);
 107 }
 108
 109 IMPLEMENT_OBJ_BSEARCH_CMP_FN(const EVP_PKEY_METHOD *, const EVP_PKEY_METHOD *,
 110                              pmeth);
 111
 112 const EVP_PKEY_METHOD *EVP_PKEY_meth_find(int type)
 113 {
 114     EVP_PKEY_METHOD tmp;
 115     const EVP_PKEY_METHOD *t = &tmp, **ret;
 116     tmp.pkey_id = type;
 117     if (app_pkey_methods) {
 118         int idx;
 119         idx = sk_EVP_PKEY_METHOD_find(app_pkey_methods, &tmp);
 120         if (idx >= 0)
 121             return sk_EVP_PKEY_METHOD_value(app_pkey_methods, idx);
 122     }
 123     ret = OBJ_bsearch_pmeth(&t, standard_methods,
 124                             sizeof(standard_methods) /
 125                             sizeof(EVP_PKEY_METHOD *));
 126     if (!ret || !*ret)
 127         return NULL;
 128     return *ret;
 129 }
 130
 131 static EVP_PKEY_CTX *int_ctx_new(EVP_PKEY *pkey, ENGINE *e, int id)
 132 {
 133     EVP_PKEY_CTX *ret;
 134     const EVP_PKEY_METHOD *pmeth;
 135     if (id == -1) {
 136         if (!pkey || !pkey->ameth)
 137             return NULL;
 138         id = pkey->ameth->pkey_id;
 139     }
 140 #ifndef OPENSSL_NO_ENGINE
 141     if (pkey && pkey->engine)
 142         e = pkey->engine;
 143     /* Try to find an ENGINE which implements this method */
 144     if (e) {
 145         if (!ENGINE_init(e)) {
 146             EVPerr(EVP_F_INT_CTX_NEW, ERR_R_ENGINE_LIB);
 147             return NULL;
 148         }
 149     } else
 150         e = ENGINE_get_pkey_meth_engine(id);
 151
 152     /*
 153      * If an ENGINE handled this method look it up. Othewise use internal
 154      * tables.
 155      */
 156
 157     if (e)
 158         pmeth = ENGINE_get_pkey_meth(e, id);
 159     else
 160 #endif
 161         pmeth = EVP_PKEY_meth_find(id);
 162
 163     if (pmeth == NULL) {
 164         EVPerr(EVP_F_INT_CTX_NEW, EVP_R_UNSUPPORTED_ALGORITHM);
 165         return NULL;
 166     }
 167
 168     ret = OPENSSL_malloc(sizeof(*ret));
 169     if (!ret) {
 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         if (pmeth->init(ret) <= 0) {
 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
 201     pmeth = OPENSSL_zalloc(sizeof(*pmeth));
 202     if (!pmeth)
 203         return NULL;
 204
 205     pmeth->pkey_id = id;
 206     pmeth->flags = flags | EVP_PKEY_FLAG_DYNAMIC;
 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_get0_info(int *ppkey_id, int *pflags,
 237                              const EVP_PKEY_METHOD *meth)
 238 {
 239     if (ppkey_id)
 240         *ppkey_id = meth->pkey_id;
 241     if (pflags)
 242         *pflags = meth->flags;
 243 }
 244
 245 void EVP_PKEY_meth_copy(EVP_PKEY_METHOD *dst, const EVP_PKEY_METHOD *src)
 246 {
 247
 248     dst->init = src->init;
 249     dst->copy = src->copy;
 250     dst->cleanup = src->cleanup;
 251
 252     dst->paramgen_init = src->paramgen_init;
 253     dst->paramgen = src->paramgen;
 254
 255     dst->keygen_init = src->keygen_init;
 256     dst->keygen = src->keygen;
 257
 258     dst->sign_init = src->sign_init;
 259     dst->sign = src->sign;
 260
 261     dst->verify_init = src->verify_init;
 262     dst->verify = src->verify;
 263
 264     dst->verify_recover_init = src->verify_recover_init;
 265     dst->verify_recover = src->verify_recover;
 266
 267     dst->signctx_init = src->signctx_init;
 268     dst->signctx = src->signctx;
 269
 270     dst->verifyctx_init = src->verifyctx_init;
 271     dst->verifyctx = src->verifyctx;
 272
 273     dst->encrypt_init = src->encrypt_init;
 274     dst->encrypt = src->encrypt;
 275
 276     dst->decrypt_init = src->decrypt_init;
 277     dst->decrypt = src->decrypt;
 278
 279     dst->derive_init = src->derive_init;
 280     dst->derive = src->derive;
 281
 282     dst->ctrl = src->ctrl;
 283     dst->ctrl_str = src->ctrl_str;
 284 }
 285
 286 void EVP_PKEY_meth_free(EVP_PKEY_METHOD *pmeth)
 287 {
 288     if (pmeth && (pmeth->flags & EVP_PKEY_FLAG_DYNAMIC))
 289         OPENSSL_free(pmeth);
 290 }
 291
 292 EVP_PKEY_CTX *EVP_PKEY_CTX_new(EVP_PKEY *pkey, ENGINE *e)
 293 {
 294     return int_ctx_new(pkey, e, -1);
 295 }
 296
 297 EVP_PKEY_CTX *EVP_PKEY_CTX_new_id(int id, ENGINE *e)
 298 {
 299     return int_ctx_new(NULL, e, id);
 300 }
 301
 302 EVP_PKEY_CTX *EVP_PKEY_CTX_dup(EVP_PKEY_CTX *pctx)
 303 {
 304     EVP_PKEY_CTX *rctx;
 305     if (!pctx->pmeth || !pctx->pmeth->copy)
 306         return NULL;
 307 #ifndef OPENSSL_NO_ENGINE
 308     /* Make sure it's safe to copy a pkey context using an ENGINE */
 309     if (pctx->engine && !ENGINE_init(pctx->engine)) {
 310         EVPerr(EVP_F_EVP_PKEY_CTX_DUP, ERR_R_ENGINE_LIB);
 311         return 0;
 312     }
 313 #endif
 314     rctx = OPENSSL_malloc(sizeof(*rctx));
 315     if (!rctx)
 316         return NULL;
 317
 318     rctx->pmeth = pctx->pmeth;
 319 #ifndef OPENSSL_NO_ENGINE
 320     rctx->engine = pctx->engine;
 321 #endif
 322
 323     if (pctx->pkey)
 324         CRYPTO_add(&pctx->pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
 325
 326     rctx->pkey = pctx->pkey;
 327
 328     if (pctx->peerkey)
 329         CRYPTO_add(&pctx->peerkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
 330
 331     rctx->peerkey = pctx->peerkey;
 332
 333     rctx->data = NULL;
 334     rctx->app_data = NULL;
 335     rctx->operation = pctx->operation;
 336
 337     if (pctx->pmeth->copy(rctx, pctx) > 0)
 338         return rctx;
 339
 340     EVP_PKEY_CTX_free(rctx);
 341     return NULL;
 342
 343 }
 344
 345 int EVP_PKEY_meth_add0(const EVP_PKEY_METHOD *pmeth)
 346 {
 347     if (app_pkey_methods == NULL) {
 348         app_pkey_methods = sk_EVP_PKEY_METHOD_new(pmeth_cmp);
 349         if (!app_pkey_methods)
 350             return 0;
 351     }
 352     if (!sk_EVP_PKEY_METHOD_push(app_pkey_methods, pmeth))
 353         return 0;
 354     sk_EVP_PKEY_METHOD_sort(app_pkey_methods);
 355     return 1;
 356 }
 357
 358 void EVP_PKEY_CTX_free(EVP_PKEY_CTX *ctx)
 359 {
 360     if (ctx == NULL)
 361         return;
 362     if (ctx->pmeth && ctx->pmeth->cleanup)
 363         ctx->pmeth->cleanup(ctx);
 364     EVP_PKEY_free(ctx->pkey);
 365     EVP_PKEY_free(ctx->peerkey);
 366 #ifndef OPENSSL_NO_ENGINE
 367     if (ctx->engine)
 368         /*
 369          * The EVP_PKEY_CTX we used belongs to an ENGINE, release the
 370          * functional reference we held for this reason.
 371          */
 372         ENGINE_finish(ctx->engine);
 373 #endif
 374     OPENSSL_free(ctx);
 375 }
 376
 377 int EVP_PKEY_CTX_ctrl(EVP_PKEY_CTX *ctx, int keytype, int optype,
 378                       int cmd, int p1, void *p2)
 379 {
 380     int ret;
 381     if (!ctx || !ctx->pmeth || !ctx->pmeth->ctrl) {
 382         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_COMMAND_NOT_SUPPORTED);
 383         return -2;
 384     }
 385     if ((keytype != -1) && (ctx->pmeth->pkey_id != keytype))
 386         return -1;
 387
 388     if (ctx->operation == EVP_PKEY_OP_UNDEFINED) {
 389         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_NO_OPERATION_SET);
 390         return -1;
 391     }
 392
 393     if ((optype != -1) && !(ctx->operation & optype)) {
 394         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_INVALID_OPERATION);
 395         return -1;
 396     }
 397
 398     ret = ctx->pmeth->ctrl(ctx, cmd, p1, p2);
 399
 400     if (ret == -2)
 401         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_COMMAND_NOT_SUPPORTED);
 402
 403     return ret;
 404
 405 }
 406
 407 int EVP_PKEY_CTX_ctrl_str(EVP_PKEY_CTX *ctx,
 408                           const char *name, const char *value)
 409 {
 410     if (!ctx || !ctx->pmeth || !ctx->pmeth->ctrl_str) {
 411         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL_STR, EVP_R_COMMAND_NOT_SUPPORTED);
 412         return -2;
 413     }
 414     if (strcmp(name, "digest") == 0) {
 415         const EVP_MD *md;
 416         if (value == NULL || (md = EVP_get_digestbyname(value)) == NULL) {
 417             EVPerr(EVP_F_EVP_PKEY_CTX_CTRL_STR, EVP_R_INVALID_DIGEST);
 418             return 0;
 419         }
 420         return EVP_PKEY_CTX_set_signature_md(ctx, md);
 421     }
 422     return ctx->pmeth->ctrl_str(ctx, name, value);
 423 }
 424
 425 int EVP_PKEY_CTX_get_operation(EVP_PKEY_CTX *ctx)
 426 {
 427     return ctx->operation;
 428 }
 429
 430 void EVP_PKEY_CTX_set0_keygen_info(EVP_PKEY_CTX *ctx, int *dat, int datlen)
 431 {
 432     ctx->keygen_info = dat;
 433     ctx->keygen_info_count = datlen;
 434 }
 435
 436 void EVP_PKEY_CTX_set_data(EVP_PKEY_CTX *ctx, void *data)
 437 {
 438     ctx->data = data;
 439 }
 440
 441 void *EVP_PKEY_CTX_get_data(EVP_PKEY_CTX *ctx)
 442 {
 443     return ctx->data;
 444 }
 445
 446 EVP_PKEY *EVP_PKEY_CTX_get0_pkey(EVP_PKEY_CTX *ctx)
 447 {
 448     return ctx->pkey;
 449 }
 450
 451 EVP_PKEY *EVP_PKEY_CTX_get0_peerkey(EVP_PKEY_CTX *ctx)
 452 {
 453     return ctx->peerkey;
 454 }
 455
 456 void EVP_PKEY_CTX_set_app_data(EVP_PKEY_CTX *ctx, void *data)
 457 {
 458     ctx->app_data = data;
 459 }
 460
 461 void *EVP_PKEY_CTX_get_app_data(EVP_PKEY_CTX *ctx)
 462 {
 463     return ctx->app_data;
 464 }
 465
 466 void EVP_PKEY_meth_set_init(EVP_PKEY_METHOD *pmeth,
 467                             int (*init) (EVP_PKEY_CTX *ctx))
 468 {
 469     pmeth->init = init;
 470 }
 471
 472 void EVP_PKEY_meth_set_copy(EVP_PKEY_METHOD *pmeth,
 473                             int (*copy) (EVP_PKEY_CTX *dst,
 474                                          EVP_PKEY_CTX *src))
 475 {
 476     pmeth->copy = copy;
 477 }
 478
 479 void EVP_PKEY_meth_set_cleanup(EVP_PKEY_METHOD *pmeth,
 480                                void (*cleanup) (EVP_PKEY_CTX *ctx))
 481 {
 482     pmeth->cleanup = cleanup;
 483 }
 484
 485 void EVP_PKEY_meth_set_paramgen(EVP_PKEY_METHOD *pmeth,
 486                                 int (*paramgen_init) (EVP_PKEY_CTX *ctx),
 487                                 int (*paramgen) (EVP_PKEY_CTX *ctx,
 488                                                  EVP_PKEY *pkey))
 489 {
 490     pmeth->paramgen_init = paramgen_init;
 491     pmeth->paramgen = paramgen;
 492 }
 493
 494 void EVP_PKEY_meth_set_keygen(EVP_PKEY_METHOD *pmeth,
 495                               int (*keygen_init) (EVP_PKEY_CTX *ctx),
 496                               int (*keygen) (EVP_PKEY_CTX *ctx,
 497                                              EVP_PKEY *pkey))
 498 {
 499     pmeth->keygen_init = keygen_init;
 500     pmeth->keygen = keygen;
 501 }
 502
 503 void EVP_PKEY_meth_set_sign(EVP_PKEY_METHOD *pmeth,
 504                             int (*sign_init) (EVP_PKEY_CTX *ctx),
 505                             int (*sign) (EVP_PKEY_CTX *ctx,
 506                                          unsigned char *sig, size_t *siglen,
 507                                          const unsigned char *tbs,
 508                                          size_t tbslen))
 509 {
 510     pmeth->sign_init = sign_init;
 511     pmeth->sign = sign;
 512 }
 513
 514 void EVP_PKEY_meth_set_verify(EVP_PKEY_METHOD *pmeth,
 515                               int (*verify_init) (EVP_PKEY_CTX *ctx),
 516                               int (*verify) (EVP_PKEY_CTX *ctx,
 517                                              const unsigned char *sig,
 518                                              size_t siglen,
 519                                              const unsigned char *tbs,
 520                                              size_t tbslen))
 521 {
 522     pmeth->verify_init = verify_init;
 523     pmeth->verify = verify;
 524 }
 525
 526 void EVP_PKEY_meth_set_verify_recover(EVP_PKEY_METHOD *pmeth,
 527                                       int (*verify_recover_init) (EVP_PKEY_CTX
 528                                                                   *ctx),
 529                                       int (*verify_recover) (EVP_PKEY_CTX
 530                                                              *ctx,
 531                                                              unsigned char
 532                                                              *sig,
 533                                                              size_t *siglen,
 534                                                              const unsigned
 535                                                              char *tbs,
 536                                                              size_t tbslen))
 537 {
 538     pmeth->verify_recover_init = verify_recover_init;
 539     pmeth->verify_recover = verify_recover;
 540 }
 541
 542 void EVP_PKEY_meth_set_signctx(EVP_PKEY_METHOD *pmeth,
 543                                int (*signctx_init) (EVP_PKEY_CTX *ctx,
 544                                                     EVP_MD_CTX *mctx),
 545                                int (*signctx) (EVP_PKEY_CTX *ctx,
 546                                                unsigned char *sig,
 547                                                size_t *siglen,
 548                                                EVP_MD_CTX *mctx))
 549 {
 550     pmeth->signctx_init = signctx_init;
 551     pmeth->signctx = signctx;
 552 }
 553
 554 void EVP_PKEY_meth_set_verifyctx(EVP_PKEY_METHOD *pmeth,
 555                                  int (*verifyctx_init) (EVP_PKEY_CTX *ctx,
 556                                                         EVP_MD_CTX *mctx),
 557                                  int (*verifyctx) (EVP_PKEY_CTX *ctx,
 558                                                    const unsigned char *sig,
 559                                                    int siglen,
 560                                                    EVP_MD_CTX *mctx))
 561 {
 562     pmeth->verifyctx_init = verifyctx_init;
 563     pmeth->verifyctx = verifyctx;
 564 }
 565
 566 void EVP_PKEY_meth_set_encrypt(EVP_PKEY_METHOD *pmeth,
 567                                int (*encrypt_init) (EVP_PKEY_CTX *ctx),
 568                                int (*encryptfn) (EVP_PKEY_CTX *ctx,
 569                                                  unsigned char *out,
 570                                                  size_t *outlen,
 571                                                  const unsigned char *in,
 572                                                  size_t inlen))
 573 {
 574     pmeth->encrypt_init = encrypt_init;
 575     pmeth->encrypt = encryptfn;
 576 }
 577
 578 void EVP_PKEY_meth_set_decrypt(EVP_PKEY_METHOD *pmeth,
 579                                int (*decrypt_init) (EVP_PKEY_CTX *ctx),
 580                                int (*decrypt) (EVP_PKEY_CTX *ctx,
 581                                                unsigned char *out,
 582                                                size_t *outlen,
 583                                                const unsigned char *in,
 584                                                size_t inlen))
 585 {
 586     pmeth->decrypt_init = decrypt_init;
 587     pmeth->decrypt = decrypt;
 588 }
 589
 590 void EVP_PKEY_meth_set_derive(EVP_PKEY_METHOD *pmeth,
 591                               int (*derive_init) (EVP_PKEY_CTX *ctx),
 592                               int (*derive) (EVP_PKEY_CTX *ctx,
 593                                              unsigned char *key,
 594                                              size_t *keylen))
 595 {
 596     pmeth->derive_init = derive_init;
 597     pmeth->derive = derive;
 598 }
 599
 600 void EVP_PKEY_meth_set_ctrl(EVP_PKEY_METHOD *pmeth,
 601                             int (*ctrl) (EVP_PKEY_CTX *ctx, int type, int p1,
 602                                          void *p2),
 603                             int (*ctrl_str) (EVP_PKEY_CTX *ctx,
 604                                              const char *type,
 605                                              const char *value))
 606 {
 607     pmeth->ctrl = ctrl;
 608     pmeth->ctrl_str = ctrl_str;
 609 }