crypto/evp/pmeth_lib.c

   1 /*
   2  * Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include "internal/cryptlib.h"
  13 #include <openssl/engine.h>
  14 #include <openssl/evp.h>
  15 #include <openssl/x509v3.h>
  16 #include "internal/asn1_int.h"
  17 #include "internal/evp_int.h"
  18 #include "internal/numbers.h"
  19
  20 typedef int sk_cmp_fn_type(const char *const *a, const char *const *b);
  21
  22 static STACK_OF(EVP_PKEY_METHOD) *app_pkey_methods = NULL;
  23
  24 static const EVP_PKEY_METHOD *standard_methods[] = {
  25 #ifndef OPENSSL_NO_RSA
  26     &rsa_pkey_meth,
  27 #endif
  28 #ifndef OPENSSL_NO_DH
  29     &dh_pkey_meth,
  30 #endif
  31 #ifndef OPENSSL_NO_DSA
  32     &dsa_pkey_meth,
  33 #endif
  34 #ifndef OPENSSL_NO_EC
  35     &ec_pkey_meth,
  36 #endif
  37     &hmac_pkey_meth,
  38 #ifndef OPENSSL_NO_CMAC
  39     &cmac_pkey_meth,
  40 #endif
  41 #ifndef OPENSSL_NO_RSA
  42     &rsa_pss_pkey_meth,
  43 #endif
  44 #ifndef OPENSSL_NO_DH
  45     &dhx_pkey_meth,
  46 #endif
  47     &tls1_prf_pkey_meth,
  48 #ifndef OPENSSL_NO_EC
  49     &ecx25519_pkey_meth,
  50 #endif
  51     &hkdf_pkey_meth
  52 };
  53
  54 DECLARE_OBJ_BSEARCH_CMP_FN(const EVP_PKEY_METHOD *, const EVP_PKEY_METHOD *,
  55                            pmeth);
  56
  57 static int pmeth_cmp(const EVP_PKEY_METHOD *const *a,
  58                      const EVP_PKEY_METHOD *const *b)
  59 {
  60     return ((*a)->pkey_id - (*b)->pkey_id);
  61 }
  62
  63 IMPLEMENT_OBJ_BSEARCH_CMP_FN(const EVP_PKEY_METHOD *, const EVP_PKEY_METHOD *,
  64                              pmeth);
  65
  66 const EVP_PKEY_METHOD *EVP_PKEY_meth_find(int type)
  67 {
  68     EVP_PKEY_METHOD tmp;
  69     const EVP_PKEY_METHOD *t = &tmp, **ret;
  70     tmp.pkey_id = type;
  71     if (app_pkey_methods) {
  72         int idx;
  73         idx = sk_EVP_PKEY_METHOD_find(app_pkey_methods, &tmp);
  74         if (idx >= 0)
  75             return sk_EVP_PKEY_METHOD_value(app_pkey_methods, idx);
  76     }
  77     ret = OBJ_bsearch_pmeth(&t, standard_methods,
  78                             sizeof(standard_methods) /
  79                             sizeof(EVP_PKEY_METHOD *));
  80     if (!ret || !*ret)
  81         return NULL;
  82     return *ret;
  83 }
  84
  85 static EVP_PKEY_CTX *int_ctx_new(EVP_PKEY *pkey, ENGINE *e, int id)
  86 {
  87     EVP_PKEY_CTX *ret;
  88     const EVP_PKEY_METHOD *pmeth;
  89     if (id == -1) {
  90         if (!pkey || !pkey->ameth)
  91             return NULL;
  92         id = pkey->ameth->pkey_id;
  93     }
  94 #ifndef OPENSSL_NO_ENGINE
  95     if (pkey && pkey->engine)
  96         e = pkey->engine;
  97     /* Try to find an ENGINE which implements this method */
  98     if (e) {
  99         if (!ENGINE_init(e)) {
 100             EVPerr(EVP_F_INT_CTX_NEW, ERR_R_ENGINE_LIB);
 101             return NULL;
 102         }
 103     } else
 104         e = ENGINE_get_pkey_meth_engine(id);
 105
 106     /*
 107      * If an ENGINE handled this method look it up. Otherwise use internal
 108      * tables.
 109      */
 110
 111     if (e)
 112         pmeth = ENGINE_get_pkey_meth(e, id);
 113     else
 114 #endif
 115         pmeth = EVP_PKEY_meth_find(id);
 116
 117     if (pmeth == NULL) {
 118         EVPerr(EVP_F_INT_CTX_NEW, EVP_R_UNSUPPORTED_ALGORITHM);
 119         return NULL;
 120     }
 121
 122     ret = OPENSSL_zalloc(sizeof(*ret));
 123     if (ret == NULL) {
 124 #ifndef OPENSSL_NO_ENGINE
 125         ENGINE_finish(e);
 126 #endif
 127         EVPerr(EVP_F_INT_CTX_NEW, ERR_R_MALLOC_FAILURE);
 128         return NULL;
 129     }
 130     ret->engine = e;
 131     ret->pmeth = pmeth;
 132     ret->operation = EVP_PKEY_OP_UNDEFINED;
 133     ret->pkey = pkey;
 134     if (pkey)
 135         EVP_PKEY_up_ref(pkey);
 136
 137     if (pmeth->init) {
 138         if (pmeth->init(ret) <= 0) {
 139             EVP_PKEY_CTX_free(ret);
 140             return NULL;
 141         }
 142     }
 143
 144     return ret;
 145 }
 146
 147 EVP_PKEY_METHOD *EVP_PKEY_meth_new(int id, int flags)
 148 {
 149     EVP_PKEY_METHOD *pmeth;
 150
 151     pmeth = OPENSSL_zalloc(sizeof(*pmeth));
 152     if (pmeth == NULL)
 153         return NULL;
 154
 155     pmeth->pkey_id = id;
 156     pmeth->flags = flags | EVP_PKEY_FLAG_DYNAMIC;
 157     return pmeth;
 158 }
 159
 160 void EVP_PKEY_meth_get0_info(int *ppkey_id, int *pflags,
 161                              const EVP_PKEY_METHOD *meth)
 162 {
 163     if (ppkey_id)
 164         *ppkey_id = meth->pkey_id;
 165     if (pflags)
 166         *pflags = meth->flags;
 167 }
 168
 169 void EVP_PKEY_meth_copy(EVP_PKEY_METHOD *dst, const EVP_PKEY_METHOD *src)
 170 {
 171
 172     dst->init = src->init;
 173     dst->copy = src->copy;
 174     dst->cleanup = src->cleanup;
 175
 176     dst->paramgen_init = src->paramgen_init;
 177     dst->paramgen = src->paramgen;
 178
 179     dst->keygen_init = src->keygen_init;
 180     dst->keygen = src->keygen;
 181
 182     dst->sign_init = src->sign_init;
 183     dst->sign = src->sign;
 184
 185     dst->verify_init = src->verify_init;
 186     dst->verify = src->verify;
 187
 188     dst->verify_recover_init = src->verify_recover_init;
 189     dst->verify_recover = src->verify_recover;
 190
 191     dst->signctx_init = src->signctx_init;
 192     dst->signctx = src->signctx;
 193
 194     dst->verifyctx_init = src->verifyctx_init;
 195     dst->verifyctx = src->verifyctx;
 196
 197     dst->encrypt_init = src->encrypt_init;
 198     dst->encrypt = src->encrypt;
 199
 200     dst->decrypt_init = src->decrypt_init;
 201     dst->decrypt = src->decrypt;
 202
 203     dst->derive_init = src->derive_init;
 204     dst->derive = src->derive;
 205
 206     dst->ctrl = src->ctrl;
 207     dst->ctrl_str = src->ctrl_str;
 208 }
 209
 210 void EVP_PKEY_meth_free(EVP_PKEY_METHOD *pmeth)
 211 {
 212     if (pmeth && (pmeth->flags & EVP_PKEY_FLAG_DYNAMIC))
 213         OPENSSL_free(pmeth);
 214 }
 215
 216 EVP_PKEY_CTX *EVP_PKEY_CTX_new(EVP_PKEY *pkey, ENGINE *e)
 217 {
 218     return int_ctx_new(pkey, e, -1);
 219 }
 220
 221 EVP_PKEY_CTX *EVP_PKEY_CTX_new_id(int id, ENGINE *e)
 222 {
 223     return int_ctx_new(NULL, e, id);
 224 }
 225
 226 EVP_PKEY_CTX *EVP_PKEY_CTX_dup(EVP_PKEY_CTX *pctx)
 227 {
 228     EVP_PKEY_CTX *rctx;
 229     if (!pctx->pmeth || !pctx->pmeth->copy)
 230         return NULL;
 231 #ifndef OPENSSL_NO_ENGINE
 232     /* Make sure it's safe to copy a pkey context using an ENGINE */
 233     if (pctx->engine && !ENGINE_init(pctx->engine)) {
 234         EVPerr(EVP_F_EVP_PKEY_CTX_DUP, ERR_R_ENGINE_LIB);
 235         return 0;
 236     }
 237 #endif
 238     rctx = OPENSSL_malloc(sizeof(*rctx));
 239     if (rctx == NULL)
 240         return NULL;
 241
 242     rctx->pmeth = pctx->pmeth;
 243 #ifndef OPENSSL_NO_ENGINE
 244     rctx->engine = pctx->engine;
 245 #endif
 246
 247     if (pctx->pkey)
 248         EVP_PKEY_up_ref(pctx->pkey);
 249
 250     rctx->pkey = pctx->pkey;
 251
 252     if (pctx->peerkey)
 253         EVP_PKEY_up_ref(pctx->peerkey);
 254
 255     rctx->peerkey = pctx->peerkey;
 256
 257     rctx->data = NULL;
 258     rctx->app_data = NULL;
 259     rctx->operation = pctx->operation;
 260
 261     if (pctx->pmeth->copy(rctx, pctx) > 0)
 262         return rctx;
 263
 264     EVP_PKEY_CTX_free(rctx);
 265     return NULL;
 266
 267 }
 268
 269 int EVP_PKEY_meth_add0(const EVP_PKEY_METHOD *pmeth)
 270 {
 271     if (app_pkey_methods == NULL) {
 272         app_pkey_methods = sk_EVP_PKEY_METHOD_new(pmeth_cmp);
 273         if (app_pkey_methods == NULL)
 274             return 0;
 275     }
 276     if (!sk_EVP_PKEY_METHOD_push(app_pkey_methods, pmeth))
 277         return 0;
 278     sk_EVP_PKEY_METHOD_sort(app_pkey_methods);
 279     return 1;
 280 }
 281
 282 void EVP_PKEY_CTX_free(EVP_PKEY_CTX *ctx)
 283 {
 284     if (ctx == NULL)
 285         return;
 286     if (ctx->pmeth && ctx->pmeth->cleanup)
 287         ctx->pmeth->cleanup(ctx);
 288     EVP_PKEY_free(ctx->pkey);
 289     EVP_PKEY_free(ctx->peerkey);
 290 #ifndef OPENSSL_NO_ENGINE
 291     ENGINE_finish(ctx->engine);
 292 #endif
 293     OPENSSL_free(ctx);
 294 }
 295
 296 int EVP_PKEY_CTX_ctrl(EVP_PKEY_CTX *ctx, int keytype, int optype,
 297                       int cmd, int p1, void *p2)
 298 {
 299     int ret;
 300     if (!ctx || !ctx->pmeth || !ctx->pmeth->ctrl) {
 301         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_COMMAND_NOT_SUPPORTED);
 302         return -2;
 303     }
 304     if ((keytype != -1) && (ctx->pmeth->pkey_id != keytype))
 305         return -1;
 306
 307     if (ctx->operation == EVP_PKEY_OP_UNDEFINED) {
 308         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_NO_OPERATION_SET);
 309         return -1;
 310     }
 311
 312     if ((optype != -1) && !(ctx->operation & optype)) {
 313         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_INVALID_OPERATION);
 314         return -1;
 315     }
 316
 317     ret = ctx->pmeth->ctrl(ctx, cmd, p1, p2);
 318
 319     if (ret == -2)
 320         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_COMMAND_NOT_SUPPORTED);
 321
 322     return ret;
 323
 324 }
 325
 326 int EVP_PKEY_CTX_ctrl_str(EVP_PKEY_CTX *ctx,
 327                           const char *name, const char *value)
 328 {
 329     if (!ctx || !ctx->pmeth || !ctx->pmeth->ctrl_str) {
 330         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL_STR, EVP_R_COMMAND_NOT_SUPPORTED);
 331         return -2;
 332     }
 333     if (strcmp(name, "digest") == 0)
 334         return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_TYPE_SIG, EVP_PKEY_CTRL_MD,
 335                                value);
 336     return ctx->pmeth->ctrl_str(ctx, name, value);
 337 }
 338
 339 /* Utility functions to send a string of hex string to a ctrl */
 340
 341 int EVP_PKEY_CTX_str2ctrl(EVP_PKEY_CTX *ctx, int cmd, const char *str)
 342 {
 343     size_t len;
 344
 345     len = strlen(str);
 346     if (len > INT_MAX)
 347         return -1;
 348     return ctx->pmeth->ctrl(ctx, cmd, len, (void *)str);
 349 }
 350
 351 int EVP_PKEY_CTX_hex2ctrl(EVP_PKEY_CTX *ctx, int cmd, const char *hex)
 352 {
 353     unsigned char *bin;
 354     long binlen;
 355     int rv = -1;
 356
 357     bin = OPENSSL_hexstr2buf(hex, &binlen);
 358     if (bin == NULL)
 359         return 0;
 360     if (binlen <= INT_MAX)
 361         rv = ctx->pmeth->ctrl(ctx, cmd, binlen, bin);
 362     OPENSSL_free(bin);
 363     return rv;
 364 }
 365
 366 /* Pass a message digest to a ctrl */
 367 int EVP_PKEY_CTX_md(EVP_PKEY_CTX *ctx, int optype, int cmd, const char *md)
 368 {
 369     const EVP_MD *m;
 370
 371     if (md == NULL || (m = EVP_get_digestbyname(md)) == NULL) {
 372         EVPerr(EVP_F_EVP_PKEY_CTX_MD, EVP_R_INVALID_DIGEST);
 373         return 0;
 374     }
 375     return EVP_PKEY_CTX_ctrl(ctx, -1, optype, cmd, 0, (void *)m);
 376 }
 377
 378 int EVP_PKEY_CTX_get_operation(EVP_PKEY_CTX *ctx)
 379 {
 380     return ctx->operation;
 381 }
 382
 383 void EVP_PKEY_CTX_set0_keygen_info(EVP_PKEY_CTX *ctx, int *dat, int datlen)
 384 {
 385     ctx->keygen_info = dat;
 386     ctx->keygen_info_count = datlen;
 387 }
 388
 389 void EVP_PKEY_CTX_set_data(EVP_PKEY_CTX *ctx, void *data)
 390 {
 391     ctx->data = data;
 392 }
 393
 394 void *EVP_PKEY_CTX_get_data(EVP_PKEY_CTX *ctx)
 395 {
 396     return ctx->data;
 397 }
 398
 399 EVP_PKEY *EVP_PKEY_CTX_get0_pkey(EVP_PKEY_CTX *ctx)
 400 {
 401     return ctx->pkey;
 402 }
 403
 404 EVP_PKEY *EVP_PKEY_CTX_get0_peerkey(EVP_PKEY_CTX *ctx)
 405 {
 406     return ctx->peerkey;
 407 }
 408
 409 void EVP_PKEY_CTX_set_app_data(EVP_PKEY_CTX *ctx, void *data)
 410 {
 411     ctx->app_data = data;
 412 }
 413
 414 void *EVP_PKEY_CTX_get_app_data(EVP_PKEY_CTX *ctx)
 415 {
 416     return ctx->app_data;
 417 }
 418
 419 void EVP_PKEY_meth_set_init(EVP_PKEY_METHOD *pmeth,
 420                             int (*init) (EVP_PKEY_CTX *ctx))
 421 {
 422     pmeth->init = init;
 423 }
 424
 425 void EVP_PKEY_meth_set_copy(EVP_PKEY_METHOD *pmeth,
 426                             int (*copy) (EVP_PKEY_CTX *dst,
 427                                          EVP_PKEY_CTX *src))
 428 {
 429     pmeth->copy = copy;
 430 }
 431
 432 void EVP_PKEY_meth_set_cleanup(EVP_PKEY_METHOD *pmeth,
 433                                void (*cleanup) (EVP_PKEY_CTX *ctx))
 434 {
 435     pmeth->cleanup = cleanup;
 436 }
 437
 438 void EVP_PKEY_meth_set_paramgen(EVP_PKEY_METHOD *pmeth,
 439                                 int (*paramgen_init) (EVP_PKEY_CTX *ctx),
 440                                 int (*paramgen) (EVP_PKEY_CTX *ctx,
 441                                                  EVP_PKEY *pkey))
 442 {
 443     pmeth->paramgen_init = paramgen_init;
 444     pmeth->paramgen = paramgen;
 445 }
 446
 447 void EVP_PKEY_meth_set_keygen(EVP_PKEY_METHOD *pmeth,
 448                               int (*keygen_init) (EVP_PKEY_CTX *ctx),
 449                               int (*keygen) (EVP_PKEY_CTX *ctx,
 450                                              EVP_PKEY *pkey))
 451 {
 452     pmeth->keygen_init = keygen_init;
 453     pmeth->keygen = keygen;
 454 }
 455
 456 void EVP_PKEY_meth_set_sign(EVP_PKEY_METHOD *pmeth,
 457                             int (*sign_init) (EVP_PKEY_CTX *ctx),
 458                             int (*sign) (EVP_PKEY_CTX *ctx,
 459                                          unsigned char *sig, size_t *siglen,
 460                                          const unsigned char *tbs,
 461                                          size_t tbslen))
 462 {
 463     pmeth->sign_init = sign_init;
 464     pmeth->sign = sign;
 465 }
 466
 467 void EVP_PKEY_meth_set_verify(EVP_PKEY_METHOD *pmeth,
 468                               int (*verify_init) (EVP_PKEY_CTX *ctx),
 469                               int (*verify) (EVP_PKEY_CTX *ctx,
 470                                              const unsigned char *sig,
 471                                              size_t siglen,
 472                                              const unsigned char *tbs,
 473                                              size_t tbslen))
 474 {
 475     pmeth->verify_init = verify_init;
 476     pmeth->verify = verify;
 477 }
 478
 479 void EVP_PKEY_meth_set_verify_recover(EVP_PKEY_METHOD *pmeth,
 480                                       int (*verify_recover_init) (EVP_PKEY_CTX
 481                                                                   *ctx),
 482                                       int (*verify_recover) (EVP_PKEY_CTX
 483                                                              *ctx,
 484                                                              unsigned char
 485                                                              *sig,
 486                                                              size_t *siglen,
 487                                                              const unsigned
 488                                                              char *tbs,
 489                                                              size_t tbslen))
 490 {
 491     pmeth->verify_recover_init = verify_recover_init;
 492     pmeth->verify_recover = verify_recover;
 493 }
 494
 495 void EVP_PKEY_meth_set_signctx(EVP_PKEY_METHOD *pmeth,
 496                                int (*signctx_init) (EVP_PKEY_CTX *ctx,
 497                                                     EVP_MD_CTX *mctx),
 498                                int (*signctx) (EVP_PKEY_CTX *ctx,
 499                                                unsigned char *sig,
 500                                                size_t *siglen,
 501                                                EVP_MD_CTX *mctx))
 502 {
 503     pmeth->signctx_init = signctx_init;
 504     pmeth->signctx = signctx;
 505 }
 506
 507 void EVP_PKEY_meth_set_verifyctx(EVP_PKEY_METHOD *pmeth,
 508                                  int (*verifyctx_init) (EVP_PKEY_CTX *ctx,
 509                                                         EVP_MD_CTX *mctx),
 510                                  int (*verifyctx) (EVP_PKEY_CTX *ctx,
 511                                                    const unsigned char *sig,
 512                                                    int siglen,
 513                                                    EVP_MD_CTX *mctx))
 514 {
 515     pmeth->verifyctx_init = verifyctx_init;
 516     pmeth->verifyctx = verifyctx;
 517 }
 518
 519 void EVP_PKEY_meth_set_encrypt(EVP_PKEY_METHOD *pmeth,
 520                                int (*encrypt_init) (EVP_PKEY_CTX *ctx),
 521                                int (*encryptfn) (EVP_PKEY_CTX *ctx,
 522                                                  unsigned char *out,
 523                                                  size_t *outlen,
 524                                                  const unsigned char *in,
 525                                                  size_t inlen))
 526 {
 527     pmeth->encrypt_init = encrypt_init;
 528     pmeth->encrypt = encryptfn;
 529 }
 530
 531 void EVP_PKEY_meth_set_decrypt(EVP_PKEY_METHOD *pmeth,
 532                                int (*decrypt_init) (EVP_PKEY_CTX *ctx),
 533                                int (*decrypt) (EVP_PKEY_CTX *ctx,
 534                                                unsigned char *out,
 535                                                size_t *outlen,
 536                                                const unsigned char *in,
 537                                                size_t inlen))
 538 {
 539     pmeth->decrypt_init = decrypt_init;
 540     pmeth->decrypt = decrypt;
 541 }
 542
 543 void EVP_PKEY_meth_set_derive(EVP_PKEY_METHOD *pmeth,
 544                               int (*derive_init) (EVP_PKEY_CTX *ctx),
 545                               int (*derive) (EVP_PKEY_CTX *ctx,
 546                                              unsigned char *key,
 547                                              size_t *keylen))
 548 {
 549     pmeth->derive_init = derive_init;
 550     pmeth->derive = derive;
 551 }
 552
 553 void EVP_PKEY_meth_set_ctrl(EVP_PKEY_METHOD *pmeth,
 554                             int (*ctrl) (EVP_PKEY_CTX *ctx, int type, int p1,
 555                                          void *p2),
 556                             int (*ctrl_str) (EVP_PKEY_CTX *ctx,
 557                                              const char *type,
 558                                              const char *value))
 559 {
 560     pmeth->ctrl = ctrl;
 561     pmeth->ctrl_str = ctrl_str;
 562 }
 563
 564 void EVP_PKEY_meth_get_init(EVP_PKEY_METHOD *pmeth,
 565                             int (**pinit) (EVP_PKEY_CTX *ctx))
 566 {
 567     *pinit = pmeth->init;
 568 }
 569
 570 void EVP_PKEY_meth_get_copy(EVP_PKEY_METHOD *pmeth,
 571                             int (**pcopy) (EVP_PKEY_CTX *dst,
 572                                            EVP_PKEY_CTX *src))
 573 {
 574     *pcopy = pmeth->copy;
 575 }
 576
 577 void EVP_PKEY_meth_get_cleanup(EVP_PKEY_METHOD *pmeth,
 578                                void (**pcleanup) (EVP_PKEY_CTX *ctx))
 579 {
 580     *pcleanup = pmeth->cleanup;
 581 }
 582
 583 void EVP_PKEY_meth_get_paramgen(EVP_PKEY_METHOD *pmeth,
 584                                 int (**pparamgen_init) (EVP_PKEY_CTX *ctx),
 585                                 int (**pparamgen) (EVP_PKEY_CTX *ctx,
 586                                                    EVP_PKEY *pkey))
 587 {
 588     if (pparamgen_init)
 589         *pparamgen_init = pmeth->paramgen_init;
 590     if (pparamgen)
 591         *pparamgen = pmeth->paramgen;
 592 }
 593
 594 void EVP_PKEY_meth_get_keygen(EVP_PKEY_METHOD *pmeth,
 595                               int (**pkeygen_init) (EVP_PKEY_CTX *ctx),
 596                               int (**pkeygen) (EVP_PKEY_CTX *ctx,
 597                                                EVP_PKEY *pkey))
 598 {
 599     if (pkeygen_init)
 600         *pkeygen_init = pmeth->keygen_init;
 601     if (pkeygen)
 602         *pkeygen = pmeth->keygen;
 603 }
 604
 605 void EVP_PKEY_meth_get_sign(EVP_PKEY_METHOD *pmeth,
 606                             int (**psign_init) (EVP_PKEY_CTX *ctx),
 607                             int (**psign) (EVP_PKEY_CTX *ctx,
 608                                            unsigned char *sig, size_t *siglen,
 609                                            const unsigned char *tbs,
 610                                            size_t tbslen))
 611 {
 612     if (psign_init)
 613         *psign_init = pmeth->sign_init;
 614     if (psign)
 615         *psign = pmeth->sign;
 616 }
 617
 618 void EVP_PKEY_meth_get_verify(EVP_PKEY_METHOD *pmeth,
 619                               int (**pverify_init) (EVP_PKEY_CTX *ctx),
 620                               int (**pverify) (EVP_PKEY_CTX *ctx,
 621                                                const unsigned char *sig,
 622                                                size_t siglen,
 623                                                const unsigned char *tbs,
 624                                                size_t tbslen))
 625 {
 626     if (pverify_init)
 627         *pverify_init = pmeth->verify_init;
 628     if (pverify)
 629         *pverify = pmeth->verify;
 630 }
 631
 632 void EVP_PKEY_meth_get_verify_recover(EVP_PKEY_METHOD *pmeth,
 633                                       int (**pverify_recover_init) (EVP_PKEY_CTX
 634                                                                     *ctx),
 635                                       int (**pverify_recover) (EVP_PKEY_CTX
 636                                                                *ctx,
 637                                                                unsigned char
 638                                                                *sig,
 639                                                                size_t *siglen,
 640                                                                const unsigned
 641                                                                char *tbs,
 642                                                                size_t tbslen))
 643 {
 644     if (pverify_recover_init)
 645         *pverify_recover_init = pmeth->verify_recover_init;
 646     if (pverify_recover)
 647         *pverify_recover = pmeth->verify_recover;
 648 }
 649
 650 void EVP_PKEY_meth_get_signctx(EVP_PKEY_METHOD *pmeth,
 651                                int (**psignctx_init) (EVP_PKEY_CTX *ctx,
 652                                                       EVP_MD_CTX *mctx),
 653                                int (**psignctx) (EVP_PKEY_CTX *ctx,
 654                                                  unsigned char *sig,
 655                                                  size_t *siglen,
 656                                                  EVP_MD_CTX *mctx))
 657 {
 658     if (psignctx_init)
 659         *psignctx_init = pmeth->signctx_init;
 660     if (psignctx)
 661         *psignctx = pmeth->signctx;
 662 }
 663
 664 void EVP_PKEY_meth_get_verifyctx(EVP_PKEY_METHOD *pmeth,
 665                                  int (**pverifyctx_init) (EVP_PKEY_CTX *ctx,
 666                                                           EVP_MD_CTX *mctx),
 667                                  int (**pverifyctx) (EVP_PKEY_CTX *ctx,
 668                                                      const unsigned char *sig,
 669                                                      int siglen,
 670                                                      EVP_MD_CTX *mctx))
 671 {
 672     if (pverifyctx_init)
 673         *pverifyctx_init = pmeth->verifyctx_init;
 674     if (pverifyctx)
 675         *pverifyctx = pmeth->verifyctx;
 676 }
 677
 678 void EVP_PKEY_meth_get_encrypt(EVP_PKEY_METHOD *pmeth,
 679                                int (**pencrypt_init) (EVP_PKEY_CTX *ctx),
 680                                int (**pencryptfn) (EVP_PKEY_CTX *ctx,
 681                                                    unsigned char *out,
 682                                                    size_t *outlen,
 683                                                    const unsigned char *in,
 684                                                    size_t inlen))
 685 {
 686     if (pencrypt_init)
 687         *pencrypt_init = pmeth->encrypt_init;
 688     if (pencryptfn)
 689         *pencryptfn = pmeth->encrypt;
 690 }
 691
 692 void EVP_PKEY_meth_get_decrypt(EVP_PKEY_METHOD *pmeth,
 693                                int (**pdecrypt_init) (EVP_PKEY_CTX *ctx),
 694                                int (**pdecrypt) (EVP_PKEY_CTX *ctx,
 695                                                  unsigned char *out,
 696                                                  size_t *outlen,
 697                                                  const unsigned char *in,
 698                                                  size_t inlen))
 699 {
 700     if (pdecrypt_init)
 701         *pdecrypt_init = pmeth->decrypt_init;
 702     if (pdecrypt)
 703         *pdecrypt = pmeth->decrypt;
 704 }
 705
 706 void EVP_PKEY_meth_get_derive(EVP_PKEY_METHOD *pmeth,
 707                               int (**pderive_init) (EVP_PKEY_CTX *ctx),
 708                               int (**pderive) (EVP_PKEY_CTX *ctx,
 709                                                unsigned char *key,
 710                                                size_t *keylen))
 711 {
 712     if (pderive_init)
 713         *pderive_init = pmeth->derive_init;
 714     if (pderive)
 715         *pderive = pmeth->derive;
 716 }
 717
 718 void EVP_PKEY_meth_get_ctrl(EVP_PKEY_METHOD *pmeth,
 719                             int (**pctrl) (EVP_PKEY_CTX *ctx, int type, int p1,
 720                                            void *p2),
 721                             int (**pctrl_str) (EVP_PKEY_CTX *ctx,
 722                                                const char *type,
 723                                                const char *value))
 724 {
 725     if (pctrl)
 726         *pctrl = pmeth->ctrl;
 727     if (pctrl_str)
 728         *pctrl_str = pmeth->ctrl_str;
 729 }