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 "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_malloc(sizeof(*pmeth));
 202     if (!pmeth)
 203         return NULL;
 204
 205     memset(pmeth, 0, sizeof(*pmeth));
 206
 207     pmeth->pkey_id = id;
 208     pmeth->flags = flags | EVP_PKEY_FLAG_DYNAMIC;
 209
 210     pmeth->init = 0;
 211     pmeth->copy = 0;
 212     pmeth->cleanup = 0;
 213     pmeth->paramgen_init = 0;
 214     pmeth->paramgen = 0;
 215     pmeth->keygen_init = 0;
 216     pmeth->keygen = 0;
 217     pmeth->sign_init = 0;
 218     pmeth->sign = 0;
 219     pmeth->verify_init = 0;
 220     pmeth->verify = 0;
 221     pmeth->verify_recover_init = 0;
 222     pmeth->verify_recover = 0;
 223     pmeth->signctx_init = 0;
 224     pmeth->signctx = 0;
 225     pmeth->verifyctx_init = 0;
 226     pmeth->verifyctx = 0;
 227     pmeth->encrypt_init = 0;
 228     pmeth->encrypt = 0;
 229     pmeth->decrypt_init = 0;
 230     pmeth->decrypt = 0;
 231     pmeth->derive_init = 0;
 232     pmeth->derive = 0;
 233     pmeth->ctrl = 0;
 234     pmeth->ctrl_str = 0;
 235
 236     return pmeth;
 237 }
 238
 239 void EVP_PKEY_meth_get0_info(int *ppkey_id, int *pflags,
 240                              const EVP_PKEY_METHOD *meth)
 241 {
 242     if (ppkey_id)
 243         *ppkey_id = meth->pkey_id;
 244     if (pflags)
 245         *pflags = meth->flags;
 246 }
 247
 248 void EVP_PKEY_meth_copy(EVP_PKEY_METHOD *dst, const EVP_PKEY_METHOD *src)
 249 {
 250
 251     dst->init = src->init;
 252     dst->copy = src->copy;
 253     dst->cleanup = src->cleanup;
 254
 255     dst->paramgen_init = src->paramgen_init;
 256     dst->paramgen = src->paramgen;
 257
 258     dst->keygen_init = src->keygen_init;
 259     dst->keygen = src->keygen;
 260
 261     dst->sign_init = src->sign_init;
 262     dst->sign = src->sign;
 263
 264     dst->verify_init = src->verify_init;
 265     dst->verify = src->verify;
 266
 267     dst->verify_recover_init = src->verify_recover_init;
 268     dst->verify_recover = src->verify_recover;
 269
 270     dst->signctx_init = src->signctx_init;
 271     dst->signctx = src->signctx;
 272
 273     dst->verifyctx_init = src->verifyctx_init;
 274     dst->verifyctx = src->verifyctx;
 275
 276     dst->encrypt_init = src->encrypt_init;
 277     dst->encrypt = src->encrypt;
 278
 279     dst->decrypt_init = src->decrypt_init;
 280     dst->decrypt = src->decrypt;
 281
 282     dst->derive_init = src->derive_init;
 283     dst->derive = src->derive;
 284
 285     dst->ctrl = src->ctrl;
 286     dst->ctrl_str = src->ctrl_str;
 287 }
 288
 289 void EVP_PKEY_meth_free(EVP_PKEY_METHOD *pmeth)
 290 {
 291     if (pmeth && (pmeth->flags & EVP_PKEY_FLAG_DYNAMIC))
 292         OPENSSL_free(pmeth);
 293 }
 294
 295 EVP_PKEY_CTX *EVP_PKEY_CTX_new(EVP_PKEY *pkey, ENGINE *e)
 296 {
 297     return int_ctx_new(pkey, e, -1);
 298 }
 299
 300 EVP_PKEY_CTX *EVP_PKEY_CTX_new_id(int id, ENGINE *e)
 301 {
 302     return int_ctx_new(NULL, e, id);
 303 }
 304
 305 EVP_PKEY_CTX *EVP_PKEY_CTX_dup(EVP_PKEY_CTX *pctx)
 306 {
 307     EVP_PKEY_CTX *rctx;
 308     if (!pctx->pmeth || !pctx->pmeth->copy)
 309         return NULL;
 310 #ifndef OPENSSL_NO_ENGINE
 311     /* Make sure it's safe to copy a pkey context using an ENGINE */
 312     if (pctx->engine && !ENGINE_init(pctx->engine)) {
 313         EVPerr(EVP_F_EVP_PKEY_CTX_DUP, ERR_R_ENGINE_LIB);
 314         return 0;
 315     }
 316 #endif
 317     rctx = OPENSSL_malloc(sizeof(*rctx));
 318     if (!rctx)
 319         return NULL;
 320
 321     rctx->pmeth = pctx->pmeth;
 322 #ifndef OPENSSL_NO_ENGINE
 323     rctx->engine = pctx->engine;
 324 #endif
 325
 326     if (pctx->pkey)
 327         CRYPTO_add(&pctx->pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
 328
 329     rctx->pkey = pctx->pkey;
 330
 331     if (pctx->peerkey)
 332         CRYPTO_add(&pctx->peerkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
 333
 334     rctx->peerkey = pctx->peerkey;
 335
 336     rctx->data = NULL;
 337     rctx->app_data = NULL;
 338     rctx->operation = pctx->operation;
 339
 340     if (pctx->pmeth->copy(rctx, pctx) > 0)
 341         return rctx;
 342
 343     EVP_PKEY_CTX_free(rctx);
 344     return NULL;
 345
 346 }
 347
 348 int EVP_PKEY_meth_add0(const EVP_PKEY_METHOD *pmeth)
 349 {
 350     if (app_pkey_methods == NULL) {
 351         app_pkey_methods = sk_EVP_PKEY_METHOD_new(pmeth_cmp);
 352         if (!app_pkey_methods)
 353             return 0;
 354     }
 355     if (!sk_EVP_PKEY_METHOD_push(app_pkey_methods, pmeth))
 356         return 0;
 357     sk_EVP_PKEY_METHOD_sort(app_pkey_methods);
 358     return 1;
 359 }
 360
 361 void EVP_PKEY_CTX_free(EVP_PKEY_CTX *ctx)
 362 {
 363     if (ctx == NULL)
 364         return;
 365     if (ctx->pmeth && ctx->pmeth->cleanup)
 366         ctx->pmeth->cleanup(ctx);
 367     EVP_PKEY_free(ctx->pkey);
 368     EVP_PKEY_free(ctx->peerkey);
 369 #ifndef OPENSSL_NO_ENGINE
 370     if (ctx->engine)
 371         /*
 372          * The EVP_PKEY_CTX we used belongs to an ENGINE, release the
 373          * functional reference we held for this reason.
 374          */
 375         ENGINE_finish(ctx->engine);
 376 #endif
 377     OPENSSL_free(ctx);
 378 }
 379
 380 int EVP_PKEY_CTX_ctrl(EVP_PKEY_CTX *ctx, int keytype, int optype,
 381                       int cmd, int p1, void *p2)
 382 {
 383     int ret;
 384     if (!ctx || !ctx->pmeth || !ctx->pmeth->ctrl) {
 385         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_COMMAND_NOT_SUPPORTED);
 386         return -2;
 387     }
 388     if ((keytype != -1) && (ctx->pmeth->pkey_id != keytype))
 389         return -1;
 390
 391     if (ctx->operation == EVP_PKEY_OP_UNDEFINED) {
 392         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_NO_OPERATION_SET);
 393         return -1;
 394     }
 395
 396     if ((optype != -1) && !(ctx->operation & optype)) {
 397         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_INVALID_OPERATION);
 398         return -1;
 399     }
 400
 401     ret = ctx->pmeth->ctrl(ctx, cmd, p1, p2);
 402
 403     if (ret == -2)
 404         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_COMMAND_NOT_SUPPORTED);
 405
 406     return ret;
 407
 408 }
 409
 410 int EVP_PKEY_CTX_ctrl_str(EVP_PKEY_CTX *ctx,
 411                           const char *name, const char *value)
 412 {
 413     if (!ctx || !ctx->pmeth || !ctx->pmeth->ctrl_str) {
 414         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL_STR, EVP_R_COMMAND_NOT_SUPPORTED);
 415         return -2;
 416     }
 417     if (strcmp(name, "digest") == 0) {
 418         const EVP_MD *md;
 419         if (!value || !(md = EVP_get_digestbyname(value))) {
 420             EVPerr(EVP_F_EVP_PKEY_CTX_CTRL_STR, EVP_R_INVALID_DIGEST);
 421             return 0;
 422         }
 423         return EVP_PKEY_CTX_set_signature_md(ctx, md);
 424     }
 425     return ctx->pmeth->ctrl_str(ctx, name, value);
 426 }
 427
 428 int EVP_PKEY_CTX_get_operation(EVP_PKEY_CTX *ctx)
 429 {
 430     return ctx->operation;
 431 }
 432
 433 void EVP_PKEY_CTX_set0_keygen_info(EVP_PKEY_CTX *ctx, int *dat, int datlen)
 434 {
 435     ctx->keygen_info = dat;
 436     ctx->keygen_info_count = datlen;
 437 }
 438
 439 void EVP_PKEY_CTX_set_data(EVP_PKEY_CTX *ctx, void *data)
 440 {
 441     ctx->data = data;
 442 }
 443
 444 void *EVP_PKEY_CTX_get_data(EVP_PKEY_CTX *ctx)
 445 {
 446     return ctx->data;
 447 }
 448
 449 EVP_PKEY *EVP_PKEY_CTX_get0_pkey(EVP_PKEY_CTX *ctx)
 450 {
 451     return ctx->pkey;
 452 }
 453
 454 EVP_PKEY *EVP_PKEY_CTX_get0_peerkey(EVP_PKEY_CTX *ctx)
 455 {
 456     return ctx->peerkey;
 457 }
 458
 459 void EVP_PKEY_CTX_set_app_data(EVP_PKEY_CTX *ctx, void *data)
 460 {
 461     ctx->app_data = data;
 462 }
 463
 464 void *EVP_PKEY_CTX_get_app_data(EVP_PKEY_CTX *ctx)
 465 {
 466     return ctx->app_data;
 467 }
 468
 469 void EVP_PKEY_meth_set_init(EVP_PKEY_METHOD *pmeth,
 470                             int (*init) (EVP_PKEY_CTX *ctx))
 471 {
 472     pmeth->init = init;
 473 }
 474
 475 void EVP_PKEY_meth_set_copy(EVP_PKEY_METHOD *pmeth,
 476                             int (*copy) (EVP_PKEY_CTX *dst,
 477                                          EVP_PKEY_CTX *src))
 478 {
 479     pmeth->copy = copy;
 480 }
 481
 482 void EVP_PKEY_meth_set_cleanup(EVP_PKEY_METHOD *pmeth,
 483                                void (*cleanup) (EVP_PKEY_CTX *ctx))
 484 {
 485     pmeth->cleanup = cleanup;
 486 }
 487
 488 void EVP_PKEY_meth_set_paramgen(EVP_PKEY_METHOD *pmeth,
 489                                 int (*paramgen_init) (EVP_PKEY_CTX *ctx),
 490                                 int (*paramgen) (EVP_PKEY_CTX *ctx,
 491                                                  EVP_PKEY *pkey))
 492 {
 493     pmeth->paramgen_init = paramgen_init;
 494     pmeth->paramgen = paramgen;
 495 }
 496
 497 void EVP_PKEY_meth_set_keygen(EVP_PKEY_METHOD *pmeth,
 498                               int (*keygen_init) (EVP_PKEY_CTX *ctx),
 499                               int (*keygen) (EVP_PKEY_CTX *ctx,
 500                                              EVP_PKEY *pkey))
 501 {
 502     pmeth->keygen_init = keygen_init;
 503     pmeth->keygen = keygen;
 504 }
 505
 506 void EVP_PKEY_meth_set_sign(EVP_PKEY_METHOD *pmeth,
 507                             int (*sign_init) (EVP_PKEY_CTX *ctx),
 508                             int (*sign) (EVP_PKEY_CTX *ctx,
 509                                          unsigned char *sig, size_t *siglen,
 510                                          const unsigned char *tbs,
 511                                          size_t tbslen))
 512 {
 513     pmeth->sign_init = sign_init;
 514     pmeth->sign = sign;
 515 }
 516
 517 void EVP_PKEY_meth_set_verify(EVP_PKEY_METHOD *pmeth,
 518                               int (*verify_init) (EVP_PKEY_CTX *ctx),
 519                               int (*verify) (EVP_PKEY_CTX *ctx,
 520                                              const unsigned char *sig,
 521                                              size_t siglen,
 522                                              const unsigned char *tbs,
 523                                              size_t tbslen))
 524 {
 525     pmeth->verify_init = verify_init;
 526     pmeth->verify = verify;
 527 }
 528
 529 void EVP_PKEY_meth_set_verify_recover(EVP_PKEY_METHOD *pmeth,
 530                                       int (*verify_recover_init) (EVP_PKEY_CTX
 531                                                                   *ctx),
 532                                       int (*verify_recover) (EVP_PKEY_CTX
 533                                                              *ctx,
 534                                                              unsigned char
 535                                                              *sig,
 536                                                              size_t *siglen,
 537                                                              const unsigned
 538                                                              char *tbs,
 539                                                              size_t tbslen))
 540 {
 541     pmeth->verify_recover_init = verify_recover_init;
 542     pmeth->verify_recover = verify_recover;
 543 }
 544
 545 void EVP_PKEY_meth_set_signctx(EVP_PKEY_METHOD *pmeth,
 546                                int (*signctx_init) (EVP_PKEY_CTX *ctx,
 547                                                     EVP_MD_CTX *mctx),
 548                                int (*signctx) (EVP_PKEY_CTX *ctx,
 549                                                unsigned char *sig,
 550                                                size_t *siglen,
 551                                                EVP_MD_CTX *mctx))
 552 {
 553     pmeth->signctx_init = signctx_init;
 554     pmeth->signctx = signctx;
 555 }
 556
 557 void EVP_PKEY_meth_set_verifyctx(EVP_PKEY_METHOD *pmeth,
 558                                  int (*verifyctx_init) (EVP_PKEY_CTX *ctx,
 559                                                         EVP_MD_CTX *mctx),
 560                                  int (*verifyctx) (EVP_PKEY_CTX *ctx,
 561                                                    const unsigned char *sig,
 562                                                    int siglen,
 563                                                    EVP_MD_CTX *mctx))
 564 {
 565     pmeth->verifyctx_init = verifyctx_init;
 566     pmeth->verifyctx = verifyctx;
 567 }
 568
 569 void EVP_PKEY_meth_set_encrypt(EVP_PKEY_METHOD *pmeth,
 570                                int (*encrypt_init) (EVP_PKEY_CTX *ctx),
 571                                int (*encryptfn) (EVP_PKEY_CTX *ctx,
 572                                                  unsigned char *out,
 573                                                  size_t *outlen,
 574                                                  const unsigned char *in,
 575                                                  size_t inlen))
 576 {
 577     pmeth->encrypt_init = encrypt_init;
 578     pmeth->encrypt = encryptfn;
 579 }
 580
 581 void EVP_PKEY_meth_set_decrypt(EVP_PKEY_METHOD *pmeth,
 582                                int (*decrypt_init) (EVP_PKEY_CTX *ctx),
 583                                int (*decrypt) (EVP_PKEY_CTX *ctx,
 584                                                unsigned char *out,
 585                                                size_t *outlen,
 586                                                const unsigned char *in,
 587                                                size_t inlen))
 588 {
 589     pmeth->decrypt_init = decrypt_init;
 590     pmeth->decrypt = decrypt;
 591 }
 592
 593 void EVP_PKEY_meth_set_derive(EVP_PKEY_METHOD *pmeth,
 594                               int (*derive_init) (EVP_PKEY_CTX *ctx),
 595                               int (*derive) (EVP_PKEY_CTX *ctx,
 596                                              unsigned char *key,
 597                                              size_t *keylen))
 598 {
 599     pmeth->derive_init = derive_init;
 600     pmeth->derive = derive;
 601 }
 602
 603 void EVP_PKEY_meth_set_ctrl(EVP_PKEY_METHOD *pmeth,
 604                             int (*ctrl) (EVP_PKEY_CTX *ctx, int type, int p1,
 605                                          void *p2),
 606                             int (*ctrl_str) (EVP_PKEY_CTX *ctx,
 607                                              const char *type,
 608                                              const char *value))
 609 {
 610     pmeth->ctrl = ctrl;
 611     pmeth->ctrl_str = ctrl_str;
 612 }