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 "evp_locl.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(EVP_PKEY_CTX));
 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     pmeth = OPENSSL_malloc(sizeof(EVP_PKEY_METHOD));
 201     if (!pmeth)
 202         return NULL;
 203
 204     memset(pmeth, 0, sizeof(EVP_PKEY_METHOD));
 205
 206     pmeth->pkey_id = id;
 207     pmeth->flags = flags | EVP_PKEY_FLAG_DYNAMIC;
 208
 209     pmeth->init = 0;
 210     pmeth->copy = 0;
 211     pmeth->cleanup = 0;
 212     pmeth->paramgen_init = 0;
 213     pmeth->paramgen = 0;
 214     pmeth->keygen_init = 0;
 215     pmeth->keygen = 0;
 216     pmeth->sign_init = 0;
 217     pmeth->sign = 0;
 218     pmeth->verify_init = 0;
 219     pmeth->verify = 0;
 220     pmeth->verify_recover_init = 0;
 221     pmeth->verify_recover = 0;
 222     pmeth->signctx_init = 0;
 223     pmeth->signctx = 0;
 224     pmeth->verifyctx_init = 0;
 225     pmeth->verifyctx = 0;
 226     pmeth->encrypt_init = 0;
 227     pmeth->encrypt = 0;
 228     pmeth->decrypt_init = 0;
 229     pmeth->decrypt = 0;
 230     pmeth->derive_init = 0;
 231     pmeth->derive = 0;
 232     pmeth->ctrl = 0;
 233     pmeth->ctrl_str = 0;
 234
 235     return pmeth;
 236 }
 237
 238 void EVP_PKEY_meth_get0_info(int *ppkey_id, int *pflags,
 239                              const EVP_PKEY_METHOD *meth)
 240 {
 241     if (ppkey_id)
 242         *ppkey_id = meth->pkey_id;
 243     if (pflags)
 244         *pflags = meth->flags;
 245 }
 246
 247 void EVP_PKEY_meth_copy(EVP_PKEY_METHOD *dst, const EVP_PKEY_METHOD *src)
 248 {
 249
 250     dst->init = src->init;
 251     dst->copy = src->copy;
 252     dst->cleanup = src->cleanup;
 253
 254     dst->paramgen_init = src->paramgen_init;
 255     dst->paramgen = src->paramgen;
 256
 257     dst->keygen_init = src->keygen_init;
 258     dst->keygen = src->keygen;
 259
 260     dst->sign_init = src->sign_init;
 261     dst->sign = src->sign;
 262
 263     dst->verify_init = src->verify_init;
 264     dst->verify = src->verify;
 265
 266     dst->verify_recover_init = src->verify_recover_init;
 267     dst->verify_recover = src->verify_recover;
 268
 269     dst->signctx_init = src->signctx_init;
 270     dst->signctx = src->signctx;
 271
 272     dst->verifyctx_init = src->verifyctx_init;
 273     dst->verifyctx = src->verifyctx;
 274
 275     dst->encrypt_init = src->encrypt_init;
 276     dst->encrypt = src->encrypt;
 277
 278     dst->decrypt_init = src->decrypt_init;
 279     dst->decrypt = src->decrypt;
 280
 281     dst->derive_init = src->derive_init;
 282     dst->derive = src->derive;
 283
 284     dst->ctrl = src->ctrl;
 285     dst->ctrl_str = src->ctrl_str;
 286 }
 287
 288 void EVP_PKEY_meth_free(EVP_PKEY_METHOD *pmeth)
 289 {
 290     if (pmeth && (pmeth->flags & EVP_PKEY_FLAG_DYNAMIC))
 291         OPENSSL_free(pmeth);
 292 }
 293
 294 EVP_PKEY_CTX *EVP_PKEY_CTX_new(EVP_PKEY *pkey, ENGINE *e)
 295 {
 296     return int_ctx_new(pkey, e, -1);
 297 }
 298
 299 EVP_PKEY_CTX *EVP_PKEY_CTX_new_id(int id, ENGINE *e)
 300 {
 301     return int_ctx_new(NULL, e, id);
 302 }
 303
 304 EVP_PKEY_CTX *EVP_PKEY_CTX_dup(EVP_PKEY_CTX *pctx)
 305 {
 306     EVP_PKEY_CTX *rctx;
 307     if (!pctx->pmeth || !pctx->pmeth->copy)
 308         return NULL;
 309 #ifndef OPENSSL_NO_ENGINE
 310     /* Make sure it's safe to copy a pkey context using an ENGINE */
 311     if (pctx->engine && !ENGINE_init(pctx->engine)) {
 312         EVPerr(EVP_F_EVP_PKEY_CTX_DUP, ERR_R_ENGINE_LIB);
 313         return 0;
 314     }
 315 #endif
 316     rctx = OPENSSL_malloc(sizeof(EVP_PKEY_CTX));
 317     if (!rctx)
 318         return NULL;
 319
 320     rctx->pmeth = pctx->pmeth;
 321 #ifndef OPENSSL_NO_ENGINE
 322     rctx->engine = pctx->engine;
 323 #endif
 324
 325     if (pctx->pkey)
 326         CRYPTO_add(&pctx->pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
 327
 328     rctx->pkey = pctx->pkey;
 329
 330     if (pctx->peerkey)
 331         CRYPTO_add(&pctx->peerkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
 332
 333     rctx->peerkey = pctx->peerkey;
 334
 335     rctx->data = NULL;
 336     rctx->app_data = NULL;
 337     rctx->operation = pctx->operation;
 338
 339     if (pctx->pmeth->copy(rctx, pctx) > 0)
 340         return rctx;
 341
 342     EVP_PKEY_CTX_free(rctx);
 343     return NULL;
 344
 345 }
 346
 347 int EVP_PKEY_meth_add0(const EVP_PKEY_METHOD *pmeth)
 348 {
 349     if (app_pkey_methods == NULL) {
 350         app_pkey_methods = sk_EVP_PKEY_METHOD_new(pmeth_cmp);
 351         if (!app_pkey_methods)
 352             return 0;
 353     }
 354     if (!sk_EVP_PKEY_METHOD_push(app_pkey_methods, pmeth))
 355         return 0;
 356     sk_EVP_PKEY_METHOD_sort(app_pkey_methods);
 357     return 1;
 358 }
 359
 360 void EVP_PKEY_CTX_free(EVP_PKEY_CTX *ctx)
 361 {
 362     if (ctx == NULL)
 363         return;
 364     if (ctx->pmeth && ctx->pmeth->cleanup)
 365         ctx->pmeth->cleanup(ctx);
 366     if (ctx->pkey)
 367         EVP_PKEY_free(ctx->pkey);
 368     if (ctx->peerkey)
 369         EVP_PKEY_free(ctx->peerkey);
 370 #ifndef OPENSSL_NO_ENGINE
 371     if (ctx->engine)
 372         /*
 373          * The EVP_PKEY_CTX we used belongs to an ENGINE, release the
 374          * functional reference we held for this reason.
 375          */
 376         ENGINE_finish(ctx->engine);
 377 #endif
 378     OPENSSL_free(ctx);
 379 }
 380
 381 int EVP_PKEY_CTX_ctrl(EVP_PKEY_CTX *ctx, int keytype, int optype,
 382                       int cmd, int p1, void *p2)
 383 {
 384     int ret;
 385     if (!ctx || !ctx->pmeth || !ctx->pmeth->ctrl) {
 386         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_COMMAND_NOT_SUPPORTED);
 387         return -2;
 388     }
 389     if ((keytype != -1) && (ctx->pmeth->pkey_id != keytype))
 390         return -1;
 391
 392     if (ctx->operation == EVP_PKEY_OP_UNDEFINED) {
 393         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_NO_OPERATION_SET);
 394         return -1;
 395     }
 396
 397     if ((optype != -1) && !(ctx->operation & optype)) {
 398         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_INVALID_OPERATION);
 399         return -1;
 400     }
 401
 402     ret = ctx->pmeth->ctrl(ctx, cmd, p1, p2);
 403
 404     if (ret == -2)
 405         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_COMMAND_NOT_SUPPORTED);
 406
 407     return ret;
 408
 409 }
 410
 411 int EVP_PKEY_CTX_ctrl_str(EVP_PKEY_CTX *ctx,
 412                           const char *name, const char *value)
 413 {
 414     if (!ctx || !ctx->pmeth || !ctx->pmeth->ctrl_str) {
 415         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL_STR, EVP_R_COMMAND_NOT_SUPPORTED);
 416         return -2;
 417     }
 418     if (!strcmp(name, "digest")) {
 419         const EVP_MD *md;
 420         if (!value || !(md = EVP_get_digestbyname(value))) {
 421             EVPerr(EVP_F_EVP_PKEY_CTX_CTRL_STR, EVP_R_INVALID_DIGEST);
 422             return 0;
 423         }
 424         return EVP_PKEY_CTX_set_signature_md(ctx, md);
 425     }
 426     return ctx->pmeth->ctrl_str(ctx, name, value);
 427 }
 428
 429 int EVP_PKEY_CTX_get_operation(EVP_PKEY_CTX *ctx)
 430 {
 431     return ctx->operation;
 432 }
 433
 434 void EVP_PKEY_CTX_set0_keygen_info(EVP_PKEY_CTX *ctx, int *dat, int datlen)
 435 {
 436     ctx->keygen_info = dat;
 437     ctx->keygen_info_count = datlen;
 438 }
 439
 440 void EVP_PKEY_CTX_set_data(EVP_PKEY_CTX *ctx, void *data)
 441 {
 442     ctx->data = data;
 443 }
 444
 445 void *EVP_PKEY_CTX_get_data(EVP_PKEY_CTX *ctx)
 446 {
 447     return ctx->data;
 448 }
 449
 450 EVP_PKEY *EVP_PKEY_CTX_get0_pkey(EVP_PKEY_CTX *ctx)
 451 {
 452     return ctx->pkey;
 453 }
 454
 455 EVP_PKEY *EVP_PKEY_CTX_get0_peerkey(EVP_PKEY_CTX *ctx)
 456 {
 457     return ctx->peerkey;
 458 }
 459
 460 void EVP_PKEY_CTX_set_app_data(EVP_PKEY_CTX *ctx, void *data)
 461 {
 462     ctx->app_data = data;
 463 }
 464
 465 void *EVP_PKEY_CTX_get_app_data(EVP_PKEY_CTX *ctx)
 466 {
 467     return ctx->app_data;
 468 }
 469
 470 void EVP_PKEY_meth_set_init(EVP_PKEY_METHOD *pmeth,
 471                             int (*init) (EVP_PKEY_CTX *ctx))
 472 {
 473     pmeth->init = init;
 474 }
 475
 476 void EVP_PKEY_meth_set_copy(EVP_PKEY_METHOD *pmeth,
 477                             int (*copy) (EVP_PKEY_CTX *dst,
 478                                          EVP_PKEY_CTX *src))
 479 {
 480     pmeth->copy = copy;
 481 }
 482
 483 void EVP_PKEY_meth_set_cleanup(EVP_PKEY_METHOD *pmeth,
 484                                void (*cleanup) (EVP_PKEY_CTX *ctx))
 485 {
 486     pmeth->cleanup = cleanup;
 487 }
 488
 489 void EVP_PKEY_meth_set_paramgen(EVP_PKEY_METHOD *pmeth,
 490                                 int (*paramgen_init) (EVP_PKEY_CTX *ctx),
 491                                 int (*paramgen) (EVP_PKEY_CTX *ctx,
 492                                                  EVP_PKEY *pkey))
 493 {
 494     pmeth->paramgen_init = paramgen_init;
 495     pmeth->paramgen = paramgen;
 496 }
 497
 498 void EVP_PKEY_meth_set_keygen(EVP_PKEY_METHOD *pmeth,
 499                               int (*keygen_init) (EVP_PKEY_CTX *ctx),
 500                               int (*keygen) (EVP_PKEY_CTX *ctx,
 501                                              EVP_PKEY *pkey))
 502 {
 503     pmeth->keygen_init = keygen_init;
 504     pmeth->keygen = keygen;
 505 }
 506
 507 void EVP_PKEY_meth_set_sign(EVP_PKEY_METHOD *pmeth,
 508                             int (*sign_init) (EVP_PKEY_CTX *ctx),
 509                             int (*sign) (EVP_PKEY_CTX *ctx,
 510                                          unsigned char *sig, size_t *siglen,
 511                                          const unsigned char *tbs,
 512                                          size_t tbslen))
 513 {
 514     pmeth->sign_init = sign_init;
 515     pmeth->sign = sign;
 516 }
 517
 518 void EVP_PKEY_meth_set_verify(EVP_PKEY_METHOD *pmeth,
 519                               int (*verify_init) (EVP_PKEY_CTX *ctx),
 520                               int (*verify) (EVP_PKEY_CTX *ctx,
 521                                              const unsigned char *sig,
 522                                              size_t siglen,
 523                                              const unsigned char *tbs,
 524                                              size_t tbslen))
 525 {
 526     pmeth->verify_init = verify_init;
 527     pmeth->verify = verify;
 528 }
 529
 530 void EVP_PKEY_meth_set_verify_recover(EVP_PKEY_METHOD *pmeth,
 531                                       int (*verify_recover_init) (EVP_PKEY_CTX
 532                                                                   *ctx),
 533                                       int (*verify_recover) (EVP_PKEY_CTX
 534                                                              *ctx,
 535                                                              unsigned char
 536                                                              *sig,
 537                                                              size_t *siglen,
 538                                                              const unsigned
 539                                                              char *tbs,
 540                                                              size_t tbslen))
 541 {
 542     pmeth->verify_recover_init = verify_recover_init;
 543     pmeth->verify_recover = verify_recover;
 544 }
 545
 546 void EVP_PKEY_meth_set_signctx(EVP_PKEY_METHOD *pmeth,
 547                                int (*signctx_init) (EVP_PKEY_CTX *ctx,
 548                                                     EVP_MD_CTX *mctx),
 549                                int (*signctx) (EVP_PKEY_CTX *ctx,
 550                                                unsigned char *sig,
 551                                                size_t *siglen,
 552                                                EVP_MD_CTX *mctx))
 553 {
 554     pmeth->signctx_init = signctx_init;
 555     pmeth->signctx = signctx;
 556 }
 557
 558 void EVP_PKEY_meth_set_verifyctx(EVP_PKEY_METHOD *pmeth,
 559                                  int (*verifyctx_init) (EVP_PKEY_CTX *ctx,
 560                                                         EVP_MD_CTX *mctx),
 561                                  int (*verifyctx) (EVP_PKEY_CTX *ctx,
 562                                                    const unsigned char *sig,
 563                                                    int siglen,
 564                                                    EVP_MD_CTX *mctx))
 565 {
 566     pmeth->verifyctx_init = verifyctx_init;
 567     pmeth->verifyctx = verifyctx;
 568 }
 569
 570 void EVP_PKEY_meth_set_encrypt(EVP_PKEY_METHOD *pmeth,
 571                                int (*encrypt_init) (EVP_PKEY_CTX *ctx),
 572                                int (*encryptfn) (EVP_PKEY_CTX *ctx,
 573                                                  unsigned char *out,
 574                                                  size_t *outlen,
 575                                                  const unsigned char *in,
 576                                                  size_t inlen))
 577 {
 578     pmeth->encrypt_init = encrypt_init;
 579     pmeth->encrypt = encryptfn;
 580 }
 581
 582 void EVP_PKEY_meth_set_decrypt(EVP_PKEY_METHOD *pmeth,
 583                                int (*decrypt_init) (EVP_PKEY_CTX *ctx),
 584                                int (*decrypt) (EVP_PKEY_CTX *ctx,
 585                                                unsigned char *out,
 586                                                size_t *outlen,
 587                                                const unsigned char *in,
 588                                                size_t inlen))
 589 {
 590     pmeth->decrypt_init = decrypt_init;
 591     pmeth->decrypt = decrypt;
 592 }
 593
 594 void EVP_PKEY_meth_set_derive(EVP_PKEY_METHOD *pmeth,
 595                               int (*derive_init) (EVP_PKEY_CTX *ctx),
 596                               int (*derive) (EVP_PKEY_CTX *ctx,
 597                                              unsigned char *key,
 598                                              size_t *keylen))
 599 {
 600     pmeth->derive_init = derive_init;
 601     pmeth->derive = derive;
 602 }
 603
 604 void EVP_PKEY_meth_set_ctrl(EVP_PKEY_METHOD *pmeth,
 605                             int (*ctrl) (EVP_PKEY_CTX *ctx, int type, int p1,
 606                                          void *p2),
 607                             int (*ctrl_str) (EVP_PKEY_CTX *ctx,
 608                                              const char *type,
 609                                              const char *value))
 610 {
 611     pmeth->ctrl = ctrl;
 612     pmeth->ctrl_str = ctrl_str;
 613 }