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