crypto/evp/pmeth_lib.c

   1
   2 /*
   3  * Copyright 2006-2018 The OpenSSL Project Authors. All Rights Reserved.
   4  *
   5  * Licensed under the Apache License 2.0 (the "License").  You may not use
   6  * this file except in compliance with the License.  You can obtain a copy
   7  * in the file LICENSE in the source distribution or at
   8  * https://www.openssl.org/source/license.html
   9  */
  10
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <openssl/engine.h>
  14 #include <openssl/evp.h>
  15 #include <openssl/x509v3.h>
  16 #include <openssl/core_names.h>
  17 #include <openssl/dh.h>
  18 #include "internal/cryptlib.h"
  19 #include "crypto/asn1.h"
  20 #include "crypto/evp.h"
  21 #include "internal/numbers.h"
  22 #include "internal/provider.h"
  23 #include "evp_local.h"
  24
  25 typedef const EVP_PKEY_METHOD *(*pmeth_fn)(void);
  26 typedef int sk_cmp_fn_type(const char *const *a, const char *const *b);
  27
  28 static STACK_OF(EVP_PKEY_METHOD) *app_pkey_methods = NULL;
  29
  30 /* This array needs to be in order of NIDs */
  31 static pmeth_fn standard_methods[] = {
  32 #ifndef OPENSSL_NO_RSA
  33     rsa_pkey_method,
  34 #endif
  35 #ifndef OPENSSL_NO_DH
  36     dh_pkey_method,
  37 #endif
  38 #ifndef OPENSSL_NO_DSA
  39     dsa_pkey_method,
  40 #endif
  41 #ifndef OPENSSL_NO_EC
  42     ec_pkey_method,
  43 #endif
  44     hmac_pkey_method,
  45 #ifndef OPENSSL_NO_CMAC
  46     cmac_pkey_method,
  47 #endif
  48 #ifndef OPENSSL_NO_RSA
  49     rsa_pss_pkey_method,
  50 #endif
  51 #ifndef OPENSSL_NO_DH
  52     dhx_pkey_method,
  53 #endif
  54 #ifndef OPENSSL_NO_SCRYPT
  55     scrypt_pkey_method,
  56 #endif
  57     tls1_prf_pkey_method,
  58 #ifndef OPENSSL_NO_EC
  59     ecx25519_pkey_method,
  60     ecx448_pkey_method,
  61 #endif
  62     hkdf_pkey_method,
  63 #ifndef OPENSSL_NO_POLY1305
  64     poly1305_pkey_method,
  65 #endif
  66 #ifndef OPENSSL_NO_SIPHASH
  67     siphash_pkey_method,
  68 #endif
  69 #ifndef OPENSSL_NO_EC
  70     ed25519_pkey_method,
  71     ed448_pkey_method,
  72 #endif
  73 #ifndef OPENSSL_NO_SM2
  74     sm2_pkey_method,
  75 #endif
  76 };
  77
  78 DECLARE_OBJ_BSEARCH_CMP_FN(const EVP_PKEY_METHOD *, pmeth_fn, pmeth_func);
  79
  80 static int pmeth_func_cmp(const EVP_PKEY_METHOD *const *a, pmeth_fn const *b)
  81 {
  82     return ((*a)->pkey_id - ((**b)())->pkey_id);
  83 }
  84
  85 IMPLEMENT_OBJ_BSEARCH_CMP_FN(const EVP_PKEY_METHOD *, pmeth_fn, pmeth_func);
  86
  87 static int pmeth_cmp(const EVP_PKEY_METHOD *const *a,
  88                      const EVP_PKEY_METHOD *const *b)
  89 {
  90     return ((*a)->pkey_id - (*b)->pkey_id);
  91 }
  92
  93 const EVP_PKEY_METHOD *EVP_PKEY_meth_find(int type)
  94 {
  95     pmeth_fn *ret;
  96     EVP_PKEY_METHOD tmp;
  97     const EVP_PKEY_METHOD *t = &tmp;
  98
  99     tmp.pkey_id = type;
 100     if (app_pkey_methods) {
 101         int idx;
 102         idx = sk_EVP_PKEY_METHOD_find(app_pkey_methods, &tmp);
 103         if (idx >= 0)
 104             return sk_EVP_PKEY_METHOD_value(app_pkey_methods, idx);
 105     }
 106     ret = OBJ_bsearch_pmeth_func(&t, standard_methods,
 107                                  sizeof(standard_methods) /
 108                                  sizeof(pmeth_fn));
 109     if (ret == NULL || *ret == NULL)
 110         return NULL;
 111     return (**ret)();
 112 }
 113
 114 static EVP_PKEY_CTX *int_ctx_new(EVP_PKEY *pkey, ENGINE *e, int id)
 115 {
 116     EVP_PKEY_CTX *ret;
 117     const EVP_PKEY_METHOD *pmeth = NULL;
 118
 119     /*
 120      * When using providers, the context is bound to the algo implementation
 121      * later.
 122      */
 123     if (pkey == NULL && e == NULL && id == -1)
 124         goto common;
 125
 126     /* TODO(3.0) Legacy code should be removed when all is provider based */
 127     /* BEGIN legacy */
 128     if (id == -1) {
 129         if (pkey == NULL)
 130             return 0;
 131         id = pkey->type;
 132     }
 133 #ifndef OPENSSL_NO_ENGINE
 134     if (e == NULL && pkey != NULL)
 135         e = pkey->pmeth_engine != NULL ? pkey->pmeth_engine : pkey->engine;
 136     /* Try to find an ENGINE which implements this method */
 137     if (e) {
 138         if (!ENGINE_init(e)) {
 139             EVPerr(EVP_F_INT_CTX_NEW, ERR_R_ENGINE_LIB);
 140             return NULL;
 141         }
 142     } else {
 143         e = ENGINE_get_pkey_meth_engine(id);
 144     }
 145
 146     /*
 147      * If an ENGINE handled this method look it up. Otherwise use internal
 148      * tables.
 149      */
 150     if (e)
 151         pmeth = ENGINE_get_pkey_meth(e, id);
 152     else
 153 #endif
 154         pmeth = EVP_PKEY_meth_find(id);
 155
 156     if (pmeth == NULL) {
 157 #ifndef OPENSSL_NO_ENGINE
 158         ENGINE_finish(e);
 159 #endif
 160         EVPerr(EVP_F_INT_CTX_NEW, EVP_R_UNSUPPORTED_ALGORITHM);
 161         return NULL;
 162     }
 163     /* END legacy */
 164
 165  common:
 166     ret = OPENSSL_zalloc(sizeof(*ret));
 167     if (ret == NULL) {
 168 #ifndef OPENSSL_NO_ENGINE
 169         ENGINE_finish(e);
 170 #endif
 171         EVPerr(EVP_F_INT_CTX_NEW, ERR_R_MALLOC_FAILURE);
 172         return NULL;
 173     }
 174     ret->engine = e;
 175     ret->pmeth = pmeth;
 176     ret->operation = EVP_PKEY_OP_UNDEFINED;
 177     ret->pkey = pkey;
 178     if (pkey != NULL)
 179         EVP_PKEY_up_ref(pkey);
 180
 181     if (pmeth != NULL && pmeth->init != NULL) {
 182         if (pmeth->init(ret) <= 0) {
 183             ret->pmeth = NULL;
 184             EVP_PKEY_CTX_free(ret);
 185             return NULL;
 186         }
 187     }
 188
 189     return ret;
 190 }
 191
 192 void evp_pkey_ctx_free_old_ops(EVP_PKEY_CTX *ctx)
 193 {
 194     if (EVP_PKEY_CTX_IS_DERIVE_OP(ctx)) {
 195         if (ctx->op.kex.exchprovctx != NULL && ctx->op.kex.exchange != NULL)
 196             ctx->op.kex.exchange->freectx(ctx->op.kex.exchprovctx);
 197         EVP_KEYEXCH_free(ctx->op.kex.exchange);
 198     } else if (EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx)) {
 199         if (ctx->op.sig.sigprovctx != NULL && ctx->op.sig.signature != NULL)
 200             ctx->op.sig.signature->freectx(ctx->op.sig.sigprovctx);
 201         EVP_SIGNATURE_free(ctx->op.sig.signature);
 202     }
 203 }
 204
 205 EVP_PKEY_METHOD *EVP_PKEY_meth_new(int id, int flags)
 206 {
 207     EVP_PKEY_METHOD *pmeth;
 208
 209     pmeth = OPENSSL_zalloc(sizeof(*pmeth));
 210     if (pmeth == NULL) {
 211         EVPerr(EVP_F_EVP_PKEY_METH_NEW, ERR_R_MALLOC_FAILURE);
 212         return NULL;
 213     }
 214
 215     pmeth->pkey_id = id;
 216     pmeth->flags = flags | EVP_PKEY_FLAG_DYNAMIC;
 217     return pmeth;
 218 }
 219
 220 void EVP_PKEY_meth_get0_info(int *ppkey_id, int *pflags,
 221                              const EVP_PKEY_METHOD *meth)
 222 {
 223     if (ppkey_id)
 224         *ppkey_id = meth->pkey_id;
 225     if (pflags)
 226         *pflags = meth->flags;
 227 }
 228
 229 void EVP_PKEY_meth_copy(EVP_PKEY_METHOD *dst, const EVP_PKEY_METHOD *src)
 230 {
 231
 232     dst->init = src->init;
 233     dst->copy = src->copy;
 234     dst->cleanup = src->cleanup;
 235
 236     dst->paramgen_init = src->paramgen_init;
 237     dst->paramgen = src->paramgen;
 238
 239     dst->keygen_init = src->keygen_init;
 240     dst->keygen = src->keygen;
 241
 242     dst->sign_init = src->sign_init;
 243     dst->sign = src->sign;
 244
 245     dst->verify_init = src->verify_init;
 246     dst->verify = src->verify;
 247
 248     dst->verify_recover_init = src->verify_recover_init;
 249     dst->verify_recover = src->verify_recover;
 250
 251     dst->signctx_init = src->signctx_init;
 252     dst->signctx = src->signctx;
 253
 254     dst->verifyctx_init = src->verifyctx_init;
 255     dst->verifyctx = src->verifyctx;
 256
 257     dst->encrypt_init = src->encrypt_init;
 258     dst->encrypt = src->encrypt;
 259
 260     dst->decrypt_init = src->decrypt_init;
 261     dst->decrypt = src->decrypt;
 262
 263     dst->derive_init = src->derive_init;
 264     dst->derive = src->derive;
 265
 266     dst->ctrl = src->ctrl;
 267     dst->ctrl_str = src->ctrl_str;
 268
 269     dst->check = src->check;
 270 }
 271
 272 void EVP_PKEY_meth_free(EVP_PKEY_METHOD *pmeth)
 273 {
 274     if (pmeth && (pmeth->flags & EVP_PKEY_FLAG_DYNAMIC))
 275         OPENSSL_free(pmeth);
 276 }
 277
 278 EVP_PKEY_CTX *EVP_PKEY_CTX_new(EVP_PKEY *pkey, ENGINE *e)
 279 {
 280     return int_ctx_new(pkey, e, -1);
 281 }
 282
 283 EVP_PKEY_CTX *EVP_PKEY_CTX_new_id(int id, ENGINE *e)
 284 {
 285     return int_ctx_new(NULL, e, id);
 286 }
 287
 288 EVP_PKEY_CTX *EVP_PKEY_CTX_dup(const EVP_PKEY_CTX *pctx)
 289 {
 290     EVP_PKEY_CTX *rctx;
 291
 292     if (((pctx->pmeth == NULL) || (pctx->pmeth->copy == NULL))
 293             && ((EVP_PKEY_CTX_IS_DERIVE_OP(pctx)
 294                  && pctx->op.kex.exchprovctx == NULL)
 295                 || (EVP_PKEY_CTX_IS_SIGNATURE_OP(pctx)
 296                     && pctx->op.sig.sigprovctx == NULL)))
 297         return NULL;
 298 #ifndef OPENSSL_NO_ENGINE
 299     /* Make sure it's safe to copy a pkey context using an ENGINE */
 300     if (pctx->engine && !ENGINE_init(pctx->engine)) {
 301         EVPerr(EVP_F_EVP_PKEY_CTX_DUP, ERR_R_ENGINE_LIB);
 302         return 0;
 303     }
 304 #endif
 305     rctx = OPENSSL_zalloc(sizeof(*rctx));
 306     if (rctx == NULL) {
 307         EVPerr(EVP_F_EVP_PKEY_CTX_DUP, ERR_R_MALLOC_FAILURE);
 308         return NULL;
 309     }
 310
 311     if (pctx->pkey != NULL)
 312         EVP_PKEY_up_ref(pctx->pkey);
 313     rctx->pkey = pctx->pkey;
 314     rctx->operation = pctx->operation;
 315
 316     if (EVP_PKEY_CTX_IS_DERIVE_OP(pctx)) {
 317         if (pctx->op.kex.exchange != NULL) {
 318             rctx->op.kex.exchange = pctx->op.kex.exchange;
 319             if (!EVP_KEYEXCH_up_ref(rctx->op.kex.exchange)) {
 320                 OPENSSL_free(rctx);
 321                 return NULL;
 322             }
 323         }
 324         if (pctx->op.kex.exchprovctx != NULL) {
 325             if (!ossl_assert(pctx->op.kex.exchange != NULL))
 326                 return NULL;
 327             rctx->op.kex.exchprovctx
 328                 = pctx->op.kex.exchange->dupctx(pctx->op.kex.exchprovctx);
 329             if (rctx->op.kex.exchprovctx == NULL) {
 330                 EVP_KEYEXCH_free(rctx->op.kex.exchange);
 331                 OPENSSL_free(rctx);
 332                 return NULL;
 333             }
 334             return rctx;
 335         }
 336     } else if (EVP_PKEY_CTX_IS_SIGNATURE_OP(pctx)) {
 337         if (pctx->op.sig.signature != NULL) {
 338             rctx->op.sig.signature = pctx->op.sig.signature;
 339             if (!EVP_SIGNATURE_up_ref(rctx->op.sig.signature)) {
 340                 OPENSSL_free(rctx);
 341                 return NULL;
 342             }
 343         }
 344         if (pctx->op.sig.sigprovctx != NULL) {
 345             if (!ossl_assert(pctx->op.sig.signature != NULL))
 346                 return NULL;
 347             rctx->op.sig.sigprovctx
 348                 = pctx->op.sig.signature->dupctx(pctx->op.sig.sigprovctx);
 349             if (rctx->op.sig.sigprovctx == NULL) {
 350                 EVP_SIGNATURE_free(rctx->op.sig.signature);
 351                 OPENSSL_free(rctx);
 352                 return NULL;
 353             }
 354             return rctx;
 355         }
 356     }
 357
 358     rctx->pmeth = pctx->pmeth;
 359 #ifndef OPENSSL_NO_ENGINE
 360     rctx->engine = pctx->engine;
 361 #endif
 362
 363     if (pctx->peerkey)
 364         EVP_PKEY_up_ref(pctx->peerkey);
 365     rctx->peerkey = pctx->peerkey;
 366
 367     if (pctx->pmeth->copy(rctx, pctx) > 0)
 368         return rctx;
 369
 370     rctx->pmeth = NULL;
 371     EVP_PKEY_CTX_free(rctx);
 372     return NULL;
 373
 374 }
 375
 376 int EVP_PKEY_meth_add0(const EVP_PKEY_METHOD *pmeth)
 377 {
 378     if (app_pkey_methods == NULL) {
 379         app_pkey_methods = sk_EVP_PKEY_METHOD_new(pmeth_cmp);
 380         if (app_pkey_methods == NULL){
 381             EVPerr(EVP_F_EVP_PKEY_METH_ADD0, ERR_R_MALLOC_FAILURE);
 382             return 0;
 383         }
 384     }
 385     if (!sk_EVP_PKEY_METHOD_push(app_pkey_methods, pmeth)) {
 386         EVPerr(EVP_F_EVP_PKEY_METH_ADD0, ERR_R_MALLOC_FAILURE);
 387         return 0;
 388     }
 389     sk_EVP_PKEY_METHOD_sort(app_pkey_methods);
 390     return 1;
 391 }
 392
 393 void evp_app_cleanup_int(void)
 394 {
 395     if (app_pkey_methods != NULL)
 396         sk_EVP_PKEY_METHOD_pop_free(app_pkey_methods, EVP_PKEY_meth_free);
 397 }
 398
 399 int EVP_PKEY_meth_remove(const EVP_PKEY_METHOD *pmeth)
 400 {
 401     const EVP_PKEY_METHOD *ret;
 402
 403     ret = sk_EVP_PKEY_METHOD_delete_ptr(app_pkey_methods, pmeth);
 404
 405     return ret == NULL ? 0 : 1;
 406 }
 407
 408 size_t EVP_PKEY_meth_get_count(void)
 409 {
 410     size_t rv = OSSL_NELEM(standard_methods);
 411
 412     if (app_pkey_methods)
 413         rv += sk_EVP_PKEY_METHOD_num(app_pkey_methods);
 414     return rv;
 415 }
 416
 417 const EVP_PKEY_METHOD *EVP_PKEY_meth_get0(size_t idx)
 418 {
 419     if (idx < OSSL_NELEM(standard_methods))
 420         return (standard_methods[idx])();
 421     if (app_pkey_methods == NULL)
 422         return NULL;
 423     idx -= OSSL_NELEM(standard_methods);
 424     if (idx >= (size_t)sk_EVP_PKEY_METHOD_num(app_pkey_methods))
 425         return NULL;
 426     return sk_EVP_PKEY_METHOD_value(app_pkey_methods, idx);
 427 }
 428
 429 void EVP_PKEY_CTX_free(EVP_PKEY_CTX *ctx)
 430 {
 431     if (ctx == NULL)
 432         return;
 433     if (ctx->pmeth && ctx->pmeth->cleanup)
 434         ctx->pmeth->cleanup(ctx);
 435
 436     evp_pkey_ctx_free_old_ops(ctx);
 437
 438     EVP_PKEY_free(ctx->pkey);
 439     EVP_PKEY_free(ctx->peerkey);
 440 #ifndef OPENSSL_NO_ENGINE
 441     ENGINE_finish(ctx->engine);
 442 #endif
 443     OPENSSL_free(ctx);
 444 }
 445
 446 int EVP_PKEY_CTX_get_params(EVP_PKEY_CTX *ctx, OSSL_PARAM *params)
 447 {
 448     if (EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx)
 449             && ctx->op.sig.sigprovctx != NULL
 450             && ctx->op.sig.signature != NULL
 451             && ctx->op.sig.signature->get_ctx_params != NULL)
 452         return ctx->op.sig.signature->get_ctx_params(ctx->op.sig.sigprovctx,
 453                                                      params);
 454     return 0;
 455 }
 456
 457 const OSSL_PARAM *EVP_PKEY_CTX_gettable_params(EVP_PKEY_CTX *ctx)
 458 {
 459     if (EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx)
 460             && ctx->op.sig.signature != NULL
 461             && ctx->op.sig.signature->gettable_ctx_params != NULL)
 462         return ctx->op.sig.signature->gettable_ctx_params();
 463
 464     return NULL;
 465 }
 466
 467 int EVP_PKEY_CTX_set_params(EVP_PKEY_CTX *ctx, OSSL_PARAM *params)
 468 {
 469     if (EVP_PKEY_CTX_IS_DERIVE_OP(ctx)
 470             && ctx->op.kex.exchprovctx != NULL
 471             && ctx->op.kex.exchange != NULL
 472             && ctx->op.kex.exchange->set_ctx_params != NULL)
 473         return ctx->op.kex.exchange->set_ctx_params(ctx->op.kex.exchprovctx,
 474                                                     params);
 475     if (EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx)
 476             && ctx->op.sig.sigprovctx != NULL
 477             && ctx->op.sig.signature != NULL
 478             && ctx->op.sig.signature->set_ctx_params != NULL)
 479         return ctx->op.sig.signature->set_ctx_params(ctx->op.sig.sigprovctx,
 480                                                      params);
 481     return 0;
 482 }
 483
 484 const OSSL_PARAM *EVP_PKEY_CTX_settable_params(EVP_PKEY_CTX *ctx)
 485 {
 486     if (EVP_PKEY_CTX_IS_DERIVE_OP(ctx)
 487             && ctx->op.kex.exchange != NULL
 488             && ctx->op.kex.exchange->settable_ctx_params != NULL)
 489         return ctx->op.kex.exchange->settable_ctx_params();
 490     if (EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx)
 491             && ctx->op.sig.signature != NULL
 492             && ctx->op.sig.signature->settable_ctx_params != NULL)
 493         return ctx->op.sig.signature->settable_ctx_params();
 494
 495     return NULL;
 496 }
 497
 498 #ifndef OPENSSL_NO_DH
 499 int EVP_PKEY_CTX_set_dh_pad(EVP_PKEY_CTX *ctx, int pad)
 500 {
 501     OSSL_PARAM dh_pad_params[2];
 502     unsigned int upad = pad;
 503
 504     /* We use EVP_PKEY_CTX_ctrl return values */
 505     if (ctx == NULL || !EVP_PKEY_CTX_IS_DERIVE_OP(ctx)) {
 506         ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
 507         return -2;
 508     }
 509
 510     /* TODO(3.0): Remove this eventually when no more legacy */
 511     if (ctx->op.kex.exchprovctx == NULL)
 512         return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_DERIVE,
 513                                  EVP_PKEY_CTRL_DH_PAD, pad, NULL);
 514
 515     dh_pad_params[0] = OSSL_PARAM_construct_uint(OSSL_EXCHANGE_PARAM_PAD, &upad);
 516     dh_pad_params[1] = OSSL_PARAM_construct_end();
 517
 518     return EVP_PKEY_CTX_set_params(ctx, dh_pad_params);
 519 }
 520 #endif
 521
 522 int EVP_PKEY_CTX_get_signature_md(EVP_PKEY_CTX *ctx, const EVP_MD **md)
 523 {
 524     OSSL_PARAM sig_md_params[3], *p = sig_md_params;
 525     /* 80 should be big enough */
 526     char name[80] = "";
 527     const EVP_MD *tmp;
 528
 529     if (ctx == NULL || !EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx)) {
 530         ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
 531         /* Uses the same return values as EVP_PKEY_CTX_ctrl */
 532         return -2;
 533     }
 534
 535     /* TODO(3.0): Remove this eventually when no more legacy */
 536     if (ctx->op.sig.sigprovctx == NULL)
 537         return EVP_PKEY_CTX_ctrl(ctx, -1, EVP_PKEY_OP_TYPE_SIG,
 538                                  EVP_PKEY_CTRL_GET_MD, 0, (void *)(md));
 539
 540     *p++ = OSSL_PARAM_construct_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST,
 541                                             name,
 542                                             sizeof(name));
 543     *p++ = OSSL_PARAM_construct_end();
 544
 545     if (!EVP_PKEY_CTX_get_params(ctx, sig_md_params))
 546         return 0;
 547
 548     tmp = EVP_get_digestbyname(name);
 549     if (tmp == NULL)
 550         return 0;
 551
 552     *md = tmp;
 553
 554     return 1;
 555 }
 556
 557 int EVP_PKEY_CTX_set_signature_md(EVP_PKEY_CTX *ctx, const EVP_MD *md)
 558 {
 559     OSSL_PARAM sig_md_params[3], *p = sig_md_params;
 560     size_t mdsize;
 561     const char *name;
 562
 563     if (ctx == NULL || !EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx)) {
 564         ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
 565         /* Uses the same return values as EVP_PKEY_CTX_ctrl */
 566         return -2;
 567     }
 568
 569     /* TODO(3.0): Remove this eventually when no more legacy */
 570     if (ctx->op.sig.sigprovctx == NULL)
 571         return EVP_PKEY_CTX_ctrl(ctx, -1, EVP_PKEY_OP_TYPE_SIG,
 572                                  EVP_PKEY_CTRL_MD, 0, (void *)(md));
 573
 574     if (md == NULL) {
 575         name = "";
 576         mdsize = 0;
 577     } else {
 578         mdsize = EVP_MD_size(md);
 579         name = EVP_MD_name(md);
 580     }
 581
 582     *p++ = OSSL_PARAM_construct_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST,
 583                                             /*
 584                                              * Cast away the const. This is read
 585                                              * only so should be safe
 586                                              */
 587                                             (char *)name,
 588                                             strlen(name) + 1);
 589     *p++ = OSSL_PARAM_construct_size_t(OSSL_SIGNATURE_PARAM_DIGEST_SIZE,
 590                                        &mdsize);
 591     *p++ = OSSL_PARAM_construct_end();
 592
 593     return EVP_PKEY_CTX_set_params(ctx, sig_md_params);
 594 }
 595
 596 static int legacy_ctrl_to_param(EVP_PKEY_CTX *ctx, int keytype, int optype,
 597                                 int cmd, int p1, void *p2)
 598 {
 599     switch (cmd) {
 600 #ifndef OPENSSL_NO_DH
 601     case EVP_PKEY_CTRL_DH_PAD:
 602         return EVP_PKEY_CTX_set_dh_pad(ctx, p1);
 603 #endif
 604     case EVP_PKEY_CTRL_MD:
 605         return EVP_PKEY_CTX_set_signature_md(ctx, p2);
 606     case EVP_PKEY_CTRL_GET_MD:
 607         return EVP_PKEY_CTX_get_signature_md(ctx, p2);
 608     }
 609     return 0;
 610 }
 611
 612 int EVP_PKEY_CTX_ctrl(EVP_PKEY_CTX *ctx, int keytype, int optype,
 613                       int cmd, int p1, void *p2)
 614 {
 615     int ret;
 616
 617     if (ctx == NULL) {
 618         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_COMMAND_NOT_SUPPORTED);
 619         return -2;
 620     }
 621
 622     if ((EVP_PKEY_CTX_IS_DERIVE_OP(ctx) && ctx->op.kex.exchprovctx != NULL)
 623             || (EVP_PKEY_CTX_IS_DERIVE_OP(ctx)
 624                 && ctx->op.sig.sigprovctx != NULL))
 625         return legacy_ctrl_to_param(ctx, keytype, optype, cmd, p1, p2);
 626
 627     if (ctx->pmeth == NULL || ctx->pmeth->ctrl == NULL) {
 628         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_COMMAND_NOT_SUPPORTED);
 629         return -2;
 630     }
 631     if ((keytype != -1) && (ctx->pmeth->pkey_id != keytype))
 632         return -1;
 633
 634     /* Skip the operation checks since this is called in a very early stage */
 635     if (ctx->pmeth->digest_custom != NULL)
 636         goto doit;
 637
 638     if (ctx->operation == EVP_PKEY_OP_UNDEFINED) {
 639         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_NO_OPERATION_SET);
 640         return -1;
 641     }
 642
 643     if ((optype != -1) && !(ctx->operation & optype)) {
 644         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_INVALID_OPERATION);
 645         return -1;
 646     }
 647
 648  doit:
 649     ret = ctx->pmeth->ctrl(ctx, cmd, p1, p2);
 650
 651     if (ret == -2)
 652         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_COMMAND_NOT_SUPPORTED);
 653
 654     return ret;
 655 }
 656
 657 int EVP_PKEY_CTX_ctrl_uint64(EVP_PKEY_CTX *ctx, int keytype, int optype,
 658                              int cmd, uint64_t value)
 659 {
 660     return EVP_PKEY_CTX_ctrl(ctx, keytype, optype, cmd, 0, &value);
 661 }
 662
 663 static int legacy_ctrl_str_to_param(EVP_PKEY_CTX *ctx, const char *name,
 664                                     const char *value)
 665 {
 666 #ifndef OPENSSL_NO_DH
 667     if (strcmp(name, "dh_pad") == 0) {
 668         int pad;
 669
 670         pad = atoi(value);
 671         return EVP_PKEY_CTX_set_dh_pad(ctx, pad);
 672     }
 673 #endif
 674     if (strcmp(name, "digest") == 0) {
 675         int ret;
 676         EVP_MD *md;
 677
 678         if (!EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx) || ctx->op.sig.signature == NULL)
 679             return 0;
 680         md = EVP_MD_fetch(ossl_provider_library_context(ctx->op.sig.signature->prov),
 681                           value, NULL);
 682         if (md == NULL)
 683             return 0;
 684         ret = EVP_PKEY_CTX_set_signature_md(ctx, md);
 685         EVP_MD_meth_free(md);
 686         return ret;
 687     }
 688
 689     return 0;
 690 }
 691
 692 int EVP_PKEY_CTX_ctrl_str(EVP_PKEY_CTX *ctx,
 693                           const char *name, const char *value)
 694 {
 695     if (ctx == NULL) {
 696         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL_STR, EVP_R_COMMAND_NOT_SUPPORTED);
 697         return -2;
 698     }
 699
 700     if ((EVP_PKEY_CTX_IS_DERIVE_OP(ctx) && ctx->op.kex.exchprovctx != NULL)
 701             || (EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx)
 702                 && ctx->op.sig.sigprovctx != NULL))
 703         return legacy_ctrl_str_to_param(ctx, name, value);
 704
 705     if (!ctx || !ctx->pmeth || !ctx->pmeth->ctrl_str) {
 706         EVPerr(EVP_F_EVP_PKEY_CTX_CTRL_STR, EVP_R_COMMAND_NOT_SUPPORTED);
 707         return -2;
 708     }
 709     if (strcmp(name, "digest") == 0)
 710         return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_TYPE_SIG, EVP_PKEY_CTRL_MD,
 711                                value);
 712     return ctx->pmeth->ctrl_str(ctx, name, value);
 713 }
 714
 715 /* Utility functions to send a string of hex string to a ctrl */
 716
 717 int EVP_PKEY_CTX_str2ctrl(EVP_PKEY_CTX *ctx, int cmd, const char *str)
 718 {
 719     size_t len;
 720
 721     len = strlen(str);
 722     if (len > INT_MAX)
 723         return -1;
 724     return ctx->pmeth->ctrl(ctx, cmd, len, (void *)str);
 725 }
 726
 727 int EVP_PKEY_CTX_hex2ctrl(EVP_PKEY_CTX *ctx, int cmd, const char *hex)
 728 {
 729     unsigned char *bin;
 730     long binlen;
 731     int rv = -1;
 732
 733     bin = OPENSSL_hexstr2buf(hex, &binlen);
 734     if (bin == NULL)
 735         return 0;
 736     if (binlen <= INT_MAX)
 737         rv = ctx->pmeth->ctrl(ctx, cmd, binlen, bin);
 738     OPENSSL_free(bin);
 739     return rv;
 740 }
 741
 742 /* Pass a message digest to a ctrl */
 743 int EVP_PKEY_CTX_md(EVP_PKEY_CTX *ctx, int optype, int cmd, const char *md)
 744 {
 745     const EVP_MD *m;
 746
 747     if (md == NULL || (m = EVP_get_digestbyname(md)) == NULL) {
 748         EVPerr(EVP_F_EVP_PKEY_CTX_MD, EVP_R_INVALID_DIGEST);
 749         return 0;
 750     }
 751     return EVP_PKEY_CTX_ctrl(ctx, -1, optype, cmd, 0, (void *)m);
 752 }
 753
 754 int EVP_PKEY_CTX_get_operation(EVP_PKEY_CTX *ctx)
 755 {
 756     return ctx->operation;
 757 }
 758
 759 void EVP_PKEY_CTX_set0_keygen_info(EVP_PKEY_CTX *ctx, int *dat, int datlen)
 760 {
 761     ctx->keygen_info = dat;
 762     ctx->keygen_info_count = datlen;
 763 }
 764
 765 void EVP_PKEY_CTX_set_data(EVP_PKEY_CTX *ctx, void *data)
 766 {
 767     ctx->data = data;
 768 }
 769
 770 void *EVP_PKEY_CTX_get_data(const EVP_PKEY_CTX *ctx)
 771 {
 772     return ctx->data;
 773 }
 774
 775 EVP_PKEY *EVP_PKEY_CTX_get0_pkey(EVP_PKEY_CTX *ctx)
 776 {
 777     return ctx->pkey;
 778 }
 779
 780 EVP_PKEY *EVP_PKEY_CTX_get0_peerkey(EVP_PKEY_CTX *ctx)
 781 {
 782     return ctx->peerkey;
 783 }
 784
 785 void EVP_PKEY_CTX_set_app_data(EVP_PKEY_CTX *ctx, void *data)
 786 {
 787     ctx->app_data = data;
 788 }
 789
 790 void *EVP_PKEY_CTX_get_app_data(EVP_PKEY_CTX *ctx)
 791 {
 792     return ctx->app_data;
 793 }
 794
 795 void EVP_PKEY_meth_set_init(EVP_PKEY_METHOD *pmeth,
 796                             int (*init) (EVP_PKEY_CTX *ctx))
 797 {
 798     pmeth->init = init;
 799 }
 800
 801 void EVP_PKEY_meth_set_copy(EVP_PKEY_METHOD *pmeth,
 802                             int (*copy) (EVP_PKEY_CTX *dst,
 803                                          const EVP_PKEY_CTX *src))
 804 {
 805     pmeth->copy = copy;
 806 }
 807
 808 void EVP_PKEY_meth_set_cleanup(EVP_PKEY_METHOD *pmeth,
 809                                void (*cleanup) (EVP_PKEY_CTX *ctx))
 810 {
 811     pmeth->cleanup = cleanup;
 812 }
 813
 814 void EVP_PKEY_meth_set_paramgen(EVP_PKEY_METHOD *pmeth,
 815                                 int (*paramgen_init) (EVP_PKEY_CTX *ctx),
 816                                 int (*paramgen) (EVP_PKEY_CTX *ctx,
 817                                                  EVP_PKEY *pkey))
 818 {
 819     pmeth->paramgen_init = paramgen_init;
 820     pmeth->paramgen = paramgen;
 821 }
 822
 823 void EVP_PKEY_meth_set_keygen(EVP_PKEY_METHOD *pmeth,
 824                               int (*keygen_init) (EVP_PKEY_CTX *ctx),
 825                               int (*keygen) (EVP_PKEY_CTX *ctx,
 826                                              EVP_PKEY *pkey))
 827 {
 828     pmeth->keygen_init = keygen_init;
 829     pmeth->keygen = keygen;
 830 }
 831
 832 void EVP_PKEY_meth_set_sign(EVP_PKEY_METHOD *pmeth,
 833                             int (*sign_init) (EVP_PKEY_CTX *ctx),
 834                             int (*sign) (EVP_PKEY_CTX *ctx,
 835                                          unsigned char *sig, size_t *siglen,
 836                                          const unsigned char *tbs,
 837                                          size_t tbslen))
 838 {
 839     pmeth->sign_init = sign_init;
 840     pmeth->sign = sign;
 841 }
 842
 843 void EVP_PKEY_meth_set_verify(EVP_PKEY_METHOD *pmeth,
 844                               int (*verify_init) (EVP_PKEY_CTX *ctx),
 845                               int (*verify) (EVP_PKEY_CTX *ctx,
 846                                              const unsigned char *sig,
 847                                              size_t siglen,
 848                                              const unsigned char *tbs,
 849                                              size_t tbslen))
 850 {
 851     pmeth->verify_init = verify_init;
 852     pmeth->verify = verify;
 853 }
 854
 855 void EVP_PKEY_meth_set_verify_recover(EVP_PKEY_METHOD *pmeth,
 856                                       int (*verify_recover_init) (EVP_PKEY_CTX
 857                                                                   *ctx),
 858                                       int (*verify_recover) (EVP_PKEY_CTX
 859                                                              *ctx,
 860                                                              unsigned char
 861                                                              *sig,
 862                                                              size_t *siglen,
 863                                                              const unsigned
 864                                                              char *tbs,
 865                                                              size_t tbslen))
 866 {
 867     pmeth->verify_recover_init = verify_recover_init;
 868     pmeth->verify_recover = verify_recover;
 869 }
 870
 871 void EVP_PKEY_meth_set_signctx(EVP_PKEY_METHOD *pmeth,
 872                                int (*signctx_init) (EVP_PKEY_CTX *ctx,
 873                                                     EVP_MD_CTX *mctx),
 874                                int (*signctx) (EVP_PKEY_CTX *ctx,
 875                                                unsigned char *sig,
 876                                                size_t *siglen,
 877                                                EVP_MD_CTX *mctx))
 878 {
 879     pmeth->signctx_init = signctx_init;
 880     pmeth->signctx = signctx;
 881 }
 882
 883 void EVP_PKEY_meth_set_verifyctx(EVP_PKEY_METHOD *pmeth,
 884                                  int (*verifyctx_init) (EVP_PKEY_CTX *ctx,
 885                                                         EVP_MD_CTX *mctx),
 886                                  int (*verifyctx) (EVP_PKEY_CTX *ctx,
 887                                                    const unsigned char *sig,
 888                                                    int siglen,
 889                                                    EVP_MD_CTX *mctx))
 890 {
 891     pmeth->verifyctx_init = verifyctx_init;
 892     pmeth->verifyctx = verifyctx;
 893 }
 894
 895 void EVP_PKEY_meth_set_encrypt(EVP_PKEY_METHOD *pmeth,
 896                                int (*encrypt_init) (EVP_PKEY_CTX *ctx),
 897                                int (*encryptfn) (EVP_PKEY_CTX *ctx,
 898                                                  unsigned char *out,
 899                                                  size_t *outlen,
 900                                                  const unsigned char *in,
 901                                                  size_t inlen))
 902 {
 903     pmeth->encrypt_init = encrypt_init;
 904     pmeth->encrypt = encryptfn;
 905 }
 906
 907 void EVP_PKEY_meth_set_decrypt(EVP_PKEY_METHOD *pmeth,
 908                                int (*decrypt_init) (EVP_PKEY_CTX *ctx),
 909                                int (*decrypt) (EVP_PKEY_CTX *ctx,
 910                                                unsigned char *out,
 911                                                size_t *outlen,
 912                                                const unsigned char *in,
 913                                                size_t inlen))
 914 {
 915     pmeth->decrypt_init = decrypt_init;
 916     pmeth->decrypt = decrypt;
 917 }
 918
 919 void EVP_PKEY_meth_set_derive(EVP_PKEY_METHOD *pmeth,
 920                               int (*derive_init) (EVP_PKEY_CTX *ctx),
 921                               int (*derive) (EVP_PKEY_CTX *ctx,
 922                                              unsigned char *key,
 923                                              size_t *keylen))
 924 {
 925     pmeth->derive_init = derive_init;
 926     pmeth->derive = derive;
 927 }
 928
 929 void EVP_PKEY_meth_set_ctrl(EVP_PKEY_METHOD *pmeth,
 930                             int (*ctrl) (EVP_PKEY_CTX *ctx, int type, int p1,
 931                                          void *p2),
 932                             int (*ctrl_str) (EVP_PKEY_CTX *ctx,
 933                                              const char *type,
 934                                              const char *value))
 935 {
 936     pmeth->ctrl = ctrl;
 937     pmeth->ctrl_str = ctrl_str;
 938 }
 939
 940 void EVP_PKEY_meth_set_check(EVP_PKEY_METHOD *pmeth,
 941                              int (*check) (EVP_PKEY *pkey))
 942 {
 943     pmeth->check = check;
 944 }
 945
 946 void EVP_PKEY_meth_set_public_check(EVP_PKEY_METHOD *pmeth,
 947                                     int (*check) (EVP_PKEY *pkey))
 948 {
 949     pmeth->public_check = check;
 950 }
 951
 952 void EVP_PKEY_meth_set_param_check(EVP_PKEY_METHOD *pmeth,
 953                                    int (*check) (EVP_PKEY *pkey))
 954 {
 955     pmeth->param_check = check;
 956 }
 957
 958 void EVP_PKEY_meth_set_digest_custom(EVP_PKEY_METHOD *pmeth,
 959                                      int (*digest_custom) (EVP_PKEY_CTX *ctx,
 960                                                            EVP_MD_CTX *mctx))
 961 {
 962     pmeth->digest_custom = digest_custom;
 963 }
 964
 965 void EVP_PKEY_meth_get_init(const EVP_PKEY_METHOD *pmeth,
 966                             int (**pinit) (EVP_PKEY_CTX *ctx))
 967 {
 968     *pinit = pmeth->init;
 969 }
 970
 971 void EVP_PKEY_meth_get_copy(const EVP_PKEY_METHOD *pmeth,
 972                             int (**pcopy) (EVP_PKEY_CTX *dst,
 973                                            const EVP_PKEY_CTX *src))
 974 {
 975     *pcopy = pmeth->copy;
 976 }
 977
 978 void EVP_PKEY_meth_get_cleanup(const EVP_PKEY_METHOD *pmeth,
 979                                void (**pcleanup) (EVP_PKEY_CTX *ctx))
 980 {
 981     *pcleanup = pmeth->cleanup;
 982 }
 983
 984 void EVP_PKEY_meth_get_paramgen(const EVP_PKEY_METHOD *pmeth,
 985                                 int (**pparamgen_init) (EVP_PKEY_CTX *ctx),
 986                                 int (**pparamgen) (EVP_PKEY_CTX *ctx,
 987                                                    EVP_PKEY *pkey))
 988 {
 989     if (pparamgen_init)
 990         *pparamgen_init = pmeth->paramgen_init;
 991     if (pparamgen)
 992         *pparamgen = pmeth->paramgen;
 993 }
 994
 995 void EVP_PKEY_meth_get_keygen(const EVP_PKEY_METHOD *pmeth,
 996                               int (**pkeygen_init) (EVP_PKEY_CTX *ctx),
 997                               int (**pkeygen) (EVP_PKEY_CTX *ctx,
 998                                                EVP_PKEY *pkey))
 999 {
1000     if (pkeygen_init)
1001         *pkeygen_init = pmeth->keygen_init;
1002     if (pkeygen)
1003         *pkeygen = pmeth->keygen;
1004 }
1005
1006 void EVP_PKEY_meth_get_sign(const EVP_PKEY_METHOD *pmeth,
1007                             int (**psign_init) (EVP_PKEY_CTX *ctx),
1008                             int (**psign) (EVP_PKEY_CTX *ctx,
1009                                            unsigned char *sig, size_t *siglen,
1010                                            const unsigned char *tbs,
1011                                            size_t tbslen))
1012 {
1013     if (psign_init)
1014         *psign_init = pmeth->sign_init;
1015     if (psign)
1016         *psign = pmeth->sign;
1017 }
1018
1019 void EVP_PKEY_meth_get_verify(const EVP_PKEY_METHOD *pmeth,
1020                               int (**pverify_init) (EVP_PKEY_CTX *ctx),
1021                               int (**pverify) (EVP_PKEY_CTX *ctx,
1022                                                const unsigned char *sig,
1023                                                size_t siglen,
1024                                                const unsigned char *tbs,
1025                                                size_t tbslen))
1026 {
1027     if (pverify_init)
1028         *pverify_init = pmeth->verify_init;
1029     if (pverify)
1030         *pverify = pmeth->verify;
1031 }
1032
1033 void EVP_PKEY_meth_get_verify_recover(const EVP_PKEY_METHOD *pmeth,
1034                                       int (**pverify_recover_init) (EVP_PKEY_CTX
1035                                                                     *ctx),
1036                                       int (**pverify_recover) (EVP_PKEY_CTX
1037                                                                *ctx,
1038                                                                unsigned char
1039                                                                *sig,
1040                                                                size_t *siglen,
1041                                                                const unsigned
1042                                                                char *tbs,
1043                                                                size_t tbslen))
1044 {
1045     if (pverify_recover_init)
1046         *pverify_recover_init = pmeth->verify_recover_init;
1047     if (pverify_recover)
1048         *pverify_recover = pmeth->verify_recover;
1049 }
1050
1051 void EVP_PKEY_meth_get_signctx(const EVP_PKEY_METHOD *pmeth,
1052                                int (**psignctx_init) (EVP_PKEY_CTX *ctx,
1053                                                       EVP_MD_CTX *mctx),
1054                                int (**psignctx) (EVP_PKEY_CTX *ctx,
1055                                                  unsigned char *sig,
1056                                                  size_t *siglen,
1057                                                  EVP_MD_CTX *mctx))
1058 {
1059     if (psignctx_init)
1060         *psignctx_init = pmeth->signctx_init;
1061     if (psignctx)
1062         *psignctx = pmeth->signctx;
1063 }
1064
1065 void EVP_PKEY_meth_get_verifyctx(const EVP_PKEY_METHOD *pmeth,
1066                                  int (**pverifyctx_init) (EVP_PKEY_CTX *ctx,
1067                                                           EVP_MD_CTX *mctx),
1068                                  int (**pverifyctx) (EVP_PKEY_CTX *ctx,
1069                                                      const unsigned char *sig,
1070                                                      int siglen,
1071                                                      EVP_MD_CTX *mctx))
1072 {
1073     if (pverifyctx_init)
1074         *pverifyctx_init = pmeth->verifyctx_init;
1075     if (pverifyctx)
1076         *pverifyctx = pmeth->verifyctx;
1077 }
1078
1079 void EVP_PKEY_meth_get_encrypt(const EVP_PKEY_METHOD *pmeth,
1080                                int (**pencrypt_init) (EVP_PKEY_CTX *ctx),
1081                                int (**pencryptfn) (EVP_PKEY_CTX *ctx,
1082                                                    unsigned char *out,
1083                                                    size_t *outlen,
1084                                                    const unsigned char *in,
1085                                                    size_t inlen))
1086 {
1087     if (pencrypt_init)
1088         *pencrypt_init = pmeth->encrypt_init;
1089     if (pencryptfn)
1090         *pencryptfn = pmeth->encrypt;
1091 }
1092
1093 void EVP_PKEY_meth_get_decrypt(const EVP_PKEY_METHOD *pmeth,
1094                                int (**pdecrypt_init) (EVP_PKEY_CTX *ctx),
1095                                int (**pdecrypt) (EVP_PKEY_CTX *ctx,
1096                                                  unsigned char *out,
1097                                                  size_t *outlen,
1098                                                  const unsigned char *in,
1099                                                  size_t inlen))
1100 {
1101     if (pdecrypt_init)
1102         *pdecrypt_init = pmeth->decrypt_init;
1103     if (pdecrypt)
1104         *pdecrypt = pmeth->decrypt;
1105 }
1106
1107 void EVP_PKEY_meth_get_derive(const EVP_PKEY_METHOD *pmeth,
1108                               int (**pderive_init) (EVP_PKEY_CTX *ctx),
1109                               int (**pderive) (EVP_PKEY_CTX *ctx,
1110                                                unsigned char *key,
1111                                                size_t *keylen))
1112 {
1113     if (pderive_init)
1114         *pderive_init = pmeth->derive_init;
1115     if (pderive)
1116         *pderive = pmeth->derive;
1117 }
1118
1119 void EVP_PKEY_meth_get_ctrl(const EVP_PKEY_METHOD *pmeth,
1120                             int (**pctrl) (EVP_PKEY_CTX *ctx, int type, int p1,
1121                                            void *p2),
1122                             int (**pctrl_str) (EVP_PKEY_CTX *ctx,
1123                                                const char *type,
1124                                                const char *value))
1125 {
1126     if (pctrl)
1127         *pctrl = pmeth->ctrl;
1128     if (pctrl_str)
1129         *pctrl_str = pmeth->ctrl_str;
1130 }
1131
1132 void EVP_PKEY_meth_get_check(const EVP_PKEY_METHOD *pmeth,
1133                              int (**pcheck) (EVP_PKEY *pkey))
1134 {
1135     if (pcheck != NULL)
1136         *pcheck = pmeth->check;
1137 }
1138
1139 void EVP_PKEY_meth_get_public_check(const EVP_PKEY_METHOD *pmeth,
1140                                     int (**pcheck) (EVP_PKEY *pkey))
1141 {
1142     if (pcheck != NULL)
1143         *pcheck = pmeth->public_check;
1144 }
1145
1146 void EVP_PKEY_meth_get_param_check(const EVP_PKEY_METHOD *pmeth,
1147                                    int (**pcheck) (EVP_PKEY *pkey))
1148 {
1149     if (pcheck != NULL)
1150         *pcheck = pmeth->param_check;
1151 }
1152
1153 void EVP_PKEY_meth_get_digest_custom(EVP_PKEY_METHOD *pmeth,
1154                                      int (**pdigest_custom) (EVP_PKEY_CTX *ctx,
1155                                                              EVP_MD_CTX *mctx))
1156 {
1157     if (pdigest_custom != NULL)
1158         *pdigest_custom = pmeth->digest_custom;
1159 }