crypto/evp/m_sigver.c

   1 /*
   2  * Copyright 2006-2020 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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 "internal/cryptlib.h"
  12 #include <openssl/evp.h>
  13 #include <openssl/objects.h>
  14 #include <openssl/x509.h>
  15 #include "crypto/evp.h"
  16 #include "internal/provider.h"
  17 #include "evp_local.h"
  18
  19 #ifndef FIPS_MODULE
  20
  21 static int update(EVP_MD_CTX *ctx, const void *data, size_t datalen)
  22 {
  23     EVPerr(EVP_F_UPDATE, EVP_R_ONLY_ONESHOT_SUPPORTED);
  24     return 0;
  25 }
  26
  27 /*
  28  * If we get the "NULL" md then the name comes back as "UNDEF". We want to use
  29  * NULL for this.
  30  */
  31 static const char *canon_mdname(const char *mdname)
  32 {
  33     if (mdname != NULL && strcmp(mdname, "UNDEF") == 0)
  34         return NULL;
  35
  36     return mdname;
  37 }
  38
  39 static int do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
  40                           const EVP_MD *type, const char *mdname,
  41                           OPENSSL_CTX *libctx, const char *props,
  42                           ENGINE *e, EVP_PKEY *pkey, int ver)
  43 {
  44     EVP_PKEY_CTX *locpctx = NULL;
  45     EVP_SIGNATURE *signature = NULL;
  46     EVP_KEYMGMT *tmp_keymgmt = NULL;
  47     const char *supported_sig = NULL;
  48     char locmdname[80] = "";     /* 80 chars should be enough */
  49     void *provkey = NULL;
  50     int ret;
  51
  52     if (ctx->provctx != NULL) {
  53         if (!ossl_assert(ctx->digest != NULL)) {
  54             ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
  55             return 0;
  56         }
  57         if (ctx->digest->freectx != NULL)
  58             ctx->digest->freectx(ctx->provctx);
  59         ctx->provctx = NULL;
  60     }
  61
  62     if (ctx->pctx == NULL) {
  63         if (libctx != NULL)
  64             ctx->pctx = EVP_PKEY_CTX_new_from_pkey(libctx, pkey, props);
  65         else
  66             ctx->pctx = EVP_PKEY_CTX_new(pkey, e);
  67     }
  68     if (ctx->pctx == NULL)
  69         return 0;
  70
  71     locpctx = ctx->pctx;
  72     evp_pkey_ctx_free_old_ops(locpctx);
  73
  74     if (props == NULL)
  75         props = locpctx->propquery;
  76
  77     /*
  78      * TODO when we stop falling back to legacy, this and the ERR_pop_to_mark()
  79      * calls can be removed.
  80      */
  81     ERR_set_mark();
  82
  83     if (evp_pkey_ctx_is_legacy(locpctx))
  84         goto legacy;
  85
  86     /*
  87      * Ensure that the key is provided, either natively, or as a cached export.
  88      */
  89     tmp_keymgmt = locpctx->keymgmt;
  90     provkey = evp_pkey_export_to_provider(locpctx->pkey, locpctx->libctx,
  91                                           &tmp_keymgmt, locpctx->propquery);
  92     if (provkey == NULL) {
  93         /*
  94          * If we couldn't find a keymgmt at all try legacy.
  95          * TODO(3.0): Once all legacy algorithms (SM2, HMAC etc) have provider
  96          * based implementations this fallback shouldn't be necessary. Either
  97          * we have an ENGINE based implementation (in which case we should have
  98          * already fallen back in the test above here), or we don't have the
  99          * provider based implementation loaded (in which case this is an
 100          * application config error)
 101          */
 102         if (locpctx->keymgmt == NULL)
 103             goto legacy;
 104         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 105         goto err;
 106     }
 107     if (!EVP_KEYMGMT_up_ref(tmp_keymgmt)) {
 108         ERR_clear_last_mark();
 109         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 110         goto err;
 111     }
 112     EVP_KEYMGMT_free(locpctx->keymgmt);
 113     locpctx->keymgmt = tmp_keymgmt;
 114
 115     if (locpctx->keymgmt->query_operation_name != NULL)
 116         supported_sig =
 117             locpctx->keymgmt->query_operation_name(OSSL_OP_SIGNATURE);
 118
 119     /*
 120      * If we didn't get a supported sig, assume there is one with the
 121      * same name as the key type.
 122      */
 123     if (supported_sig == NULL)
 124         supported_sig = locpctx->keytype;
 125
 126     /*
 127      * Because we cleared out old ops, we shouldn't need to worry about
 128      * checking if signature is already there.
 129      */
 130     signature = EVP_SIGNATURE_fetch(locpctx->libctx, supported_sig,
 131                                     locpctx->propquery);
 132
 133     if (signature == NULL
 134         || (EVP_KEYMGMT_provider(locpctx->keymgmt)
 135             != EVP_SIGNATURE_provider(signature))) {
 136         /*
 137          * We don't need to free ctx->keymgmt here, as it's not necessarily
 138          * tied to this operation.  It will be freed by EVP_PKEY_CTX_free().
 139          */
 140         EVP_SIGNATURE_free(signature);
 141         goto legacy;
 142     }
 143
 144     /*
 145      * TODO remove this when legacy is gone
 146      * If we don't have the full support we need with provided methods,
 147      * let's go see if legacy does.
 148      */
 149     ERR_pop_to_mark();
 150
 151     /* No more legacy from here down to legacy: */
 152
 153     if (pctx != NULL)
 154         *pctx = locpctx;
 155
 156     locpctx->op.sig.signature = signature;
 157     locpctx->operation = ver ? EVP_PKEY_OP_VERIFYCTX
 158                              : EVP_PKEY_OP_SIGNCTX;
 159     locpctx->op.sig.sigprovctx
 160         = signature->newctx(ossl_provider_ctx(signature->prov), props);
 161     if (locpctx->op.sig.sigprovctx == NULL) {
 162         ERR_raise(ERR_LIB_EVP,  EVP_R_INITIALIZATION_ERROR);
 163         goto err;
 164     }
 165     if (type != NULL) {
 166         ctx->reqdigest = type;
 167         if (mdname == NULL)
 168             mdname = canon_mdname(EVP_MD_name(type));
 169     } else {
 170         if (mdname == NULL) {
 171             if (evp_keymgmt_util_get_deflt_digest_name(tmp_keymgmt, provkey,
 172                                                        locmdname,
 173                                                        sizeof(locmdname)) > 0) {
 174                 mdname = canon_mdname(locmdname);
 175             }
 176         }
 177
 178         if (mdname != NULL) {
 179             /*
 180              * We're about to get a new digest so clear anything associated with
 181              * an old digest.
 182              */
 183             evp_md_ctx_clear_digest(ctx, 1);
 184
 185             /* legacy code support for engines */
 186             ERR_set_mark();
 187             /*
 188              * This might be requested by a later call to EVP_MD_CTX_md().
 189              * In that case the "explicit fetch" rules apply for that
 190              * function (as per man pages), i.e. the ref count is not updated
 191              * so the EVP_MD should not be used beyound the lifetime of the
 192              * EVP_MD_CTX.
 193              */
 194             ctx->fetched_digest = EVP_MD_fetch(locpctx->libctx, mdname, props);
 195             if (ctx->fetched_digest != NULL) {
 196                 ctx->digest = ctx->reqdigest = ctx->fetched_digest;
 197             } else {
 198                 /* legacy engine support : remove the mark when this is deleted */
 199                 ctx->reqdigest = ctx->digest = EVP_get_digestbyname(mdname);
 200                 if (ctx->digest == NULL) {
 201                     (void)ERR_clear_last_mark();
 202                     ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 203                     goto err;
 204                 }
 205             }
 206             (void)ERR_pop_to_mark();
 207         }
 208     }
 209
 210     if (ver) {
 211         if (signature->digest_verify_init == NULL) {
 212             ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 213             goto err;
 214         }
 215         ret = signature->digest_verify_init(locpctx->op.sig.sigprovctx,
 216                                             mdname, provkey);
 217     } else {
 218         if (signature->digest_sign_init == NULL) {
 219             ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 220             goto err;
 221         }
 222         ret = signature->digest_sign_init(locpctx->op.sig.sigprovctx,
 223                                           mdname, provkey);
 224     }
 225
 226     goto end;
 227
 228  err:
 229     evp_pkey_ctx_free_old_ops(locpctx);
 230     locpctx->operation = EVP_PKEY_OP_UNDEFINED;
 231     return 0;
 232
 233  legacy:
 234     /*
 235      * TODO remove this when legacy is gone
 236      * If we don't have the full support we need with provided methods,
 237      * let's go see if legacy does.
 238      */
 239     ERR_pop_to_mark();
 240
 241     if (type == NULL && mdname != NULL)
 242         type = evp_get_digestbyname_ex(locpctx->libctx, mdname);
 243
 244     if (ctx->pctx->pmeth == NULL) {
 245         EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 246         return 0;
 247     }
 248
 249     if (!(ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)) {
 250
 251         if (type == NULL) {
 252             int def_nid;
 253             if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) > 0)
 254                 type = EVP_get_digestbynid(def_nid);
 255         }
 256
 257         if (type == NULL) {
 258             EVPerr(EVP_F_DO_SIGVER_INIT, EVP_R_NO_DEFAULT_DIGEST);
 259             return 0;
 260         }
 261     }
 262
 263     if (ver) {
 264         if (ctx->pctx->pmeth->verifyctx_init) {
 265             if (ctx->pctx->pmeth->verifyctx_init(ctx->pctx, ctx) <= 0)
 266                 return 0;
 267             ctx->pctx->operation = EVP_PKEY_OP_VERIFYCTX;
 268         } else if (ctx->pctx->pmeth->digestverify != 0) {
 269             ctx->pctx->operation = EVP_PKEY_OP_VERIFY;
 270             ctx->update = update;
 271         } else if (EVP_PKEY_verify_init(ctx->pctx) <= 0) {
 272             return 0;
 273         }
 274     } else {
 275         if (ctx->pctx->pmeth->signctx_init) {
 276             if (ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx) <= 0)
 277                 return 0;
 278             ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX;
 279         } else if (ctx->pctx->pmeth->digestsign != 0) {
 280             ctx->pctx->operation = EVP_PKEY_OP_SIGN;
 281             ctx->update = update;
 282         } else if (EVP_PKEY_sign_init(ctx->pctx) <= 0) {
 283             return 0;
 284         }
 285     }
 286     if (EVP_PKEY_CTX_set_signature_md(ctx->pctx, type) <= 0)
 287         return 0;
 288     if (pctx)
 289         *pctx = ctx->pctx;
 290     if (ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)
 291         return 1;
 292     if (!EVP_DigestInit_ex(ctx, type, e))
 293         return 0;
 294     /*
 295      * This indicates the current algorithm requires
 296      * special treatment before hashing the tbs-message.
 297      */
 298     ctx->pctx->flag_call_digest_custom = 0;
 299     if (ctx->pctx->pmeth->digest_custom != NULL)
 300         ctx->pctx->flag_call_digest_custom = 1;
 301
 302     ret = 1;
 303
 304  end:
 305 #ifndef FIPS_MODULE
 306     if (ret > 0)
 307         ret = evp_pkey_ctx_use_cached_data(locpctx);
 308 #endif
 309
 310     return ret > 0 ? 1 : 0;
 311 }
 312
 313 int EVP_DigestSignInit_ex(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 314                           const char *mdname, OPENSSL_CTX *libctx,
 315                           const char *props, EVP_PKEY *pkey)
 316 {
 317     return do_sigver_init(ctx, pctx, NULL, mdname, libctx, props, NULL, pkey, 0);
 318 }
 319
 320 int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 321                        const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
 322 {
 323     return do_sigver_init(ctx, pctx, type, NULL, NULL, NULL, e, pkey, 0);
 324 }
 325
 326 int EVP_DigestVerifyInit_ex(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 327                             const char *mdname, OPENSSL_CTX *libctx,
 328                             const char *props, EVP_PKEY *pkey)
 329 {
 330     return do_sigver_init(ctx, pctx, NULL, mdname, libctx, props, NULL, pkey, 1);
 331 }
 332
 333 int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 334                          const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
 335 {
 336     return do_sigver_init(ctx, pctx, type, NULL, NULL, NULL, e, pkey, 1);
 337 }
 338 #endif /* FIPS_MDOE */
 339
 340 int EVP_DigestSignUpdate(EVP_MD_CTX *ctx, const void *data, size_t dsize)
 341 {
 342     EVP_PKEY_CTX *pctx = ctx->pctx;
 343
 344     if (pctx == NULL
 345             || pctx->operation != EVP_PKEY_OP_SIGNCTX
 346             || pctx->op.sig.sigprovctx == NULL
 347             || pctx->op.sig.signature == NULL)
 348         goto legacy;
 349
 350     if (pctx->op.sig.signature->digest_sign_update == NULL) {
 351         ERR_raise(ERR_LIB_EVP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 352         return 0;
 353     }
 354
 355     return pctx->op.sig.signature->digest_sign_update(pctx->op.sig.sigprovctx,
 356                                                       data, dsize);
 357
 358  legacy:
 359     if (pctx != NULL) {
 360         /* do_sigver_init() checked that |digest_custom| is non-NULL */
 361         if (pctx->flag_call_digest_custom
 362             && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx))
 363             return 0;
 364         pctx->flag_call_digest_custom = 0;
 365     }
 366
 367     return EVP_DigestUpdate(ctx, data, dsize);
 368 }
 369
 370 int EVP_DigestVerifyUpdate(EVP_MD_CTX *ctx, const void *data, size_t dsize)
 371 {
 372     EVP_PKEY_CTX *pctx = ctx->pctx;
 373
 374     if (pctx == NULL
 375             || pctx->operation != EVP_PKEY_OP_VERIFYCTX
 376             || pctx->op.sig.sigprovctx == NULL
 377             || pctx->op.sig.signature == NULL)
 378         goto legacy;
 379
 380     if (pctx->op.sig.signature->digest_verify_update == NULL) {
 381         ERR_raise(ERR_LIB_EVP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 382         return 0;
 383     }
 384
 385     return pctx->op.sig.signature->digest_verify_update(pctx->op.sig.sigprovctx,
 386                                                         data, dsize);
 387
 388  legacy:
 389     if (pctx != NULL) {
 390         /* do_sigver_init() checked that |digest_custom| is non-NULL */
 391         if (pctx->flag_call_digest_custom
 392             && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx))
 393             return 0;
 394         pctx->flag_call_digest_custom = 0;
 395     }
 396
 397     return EVP_DigestUpdate(ctx, data, dsize);
 398 }
 399
 400 #ifndef FIPS_MODULE
 401 int EVP_DigestSignFinal(EVP_MD_CTX *ctx, unsigned char *sigret,
 402                         size_t *siglen)
 403 {
 404     int sctx = 0, r = 0;
 405     EVP_PKEY_CTX *pctx = ctx->pctx;
 406
 407     if (pctx == NULL
 408             || pctx->operation != EVP_PKEY_OP_SIGNCTX
 409             || pctx->op.sig.sigprovctx == NULL
 410             || pctx->op.sig.signature == NULL)
 411         goto legacy;
 412
 413     return pctx->op.sig.signature->digest_sign_final(pctx->op.sig.sigprovctx,
 414                                                      sigret, siglen, SIZE_MAX);
 415
 416  legacy:
 417     if (pctx == NULL || pctx->pmeth == NULL) {
 418         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 419         return 0;
 420     }
 421
 422     /* do_sigver_init() checked that |digest_custom| is non-NULL */
 423     if (pctx->flag_call_digest_custom
 424         && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx))
 425         return 0;
 426     pctx->flag_call_digest_custom = 0;
 427
 428     if (pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM) {
 429         if (sigret == NULL)
 430             return pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
 431         if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE)
 432             r = pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
 433         else {
 434             EVP_PKEY_CTX *dctx = EVP_PKEY_CTX_dup(pctx);
 435
 436             if (dctx == NULL)
 437                 return 0;
 438             r = dctx->pmeth->signctx(dctx, sigret, siglen, ctx);
 439             EVP_PKEY_CTX_free(dctx);
 440         }
 441         return r;
 442     }
 443     if (pctx->pmeth->signctx != NULL)
 444         sctx = 1;
 445     else
 446         sctx = 0;
 447     if (sigret != NULL) {
 448         unsigned char md[EVP_MAX_MD_SIZE];
 449         unsigned int mdlen = 0;
 450
 451         if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) {
 452             if (sctx)
 453                 r = pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
 454             else
 455                 r = EVP_DigestFinal_ex(ctx, md, &mdlen);
 456         } else {
 457             EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
 458
 459             if (tmp_ctx == NULL)
 460                 return 0;
 461             if (!EVP_MD_CTX_copy_ex(tmp_ctx, ctx)) {
 462                 EVP_MD_CTX_free(tmp_ctx);
 463                 return 0;
 464             }
 465             if (sctx)
 466                 r = tmp_ctx->pctx->pmeth->signctx(tmp_ctx->pctx,
 467                                                   sigret, siglen, tmp_ctx);
 468             else
 469                 r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen);
 470             EVP_MD_CTX_free(tmp_ctx);
 471         }
 472         if (sctx || !r)
 473             return r;
 474         if (EVP_PKEY_sign(pctx, sigret, siglen, md, mdlen) <= 0)
 475             return 0;
 476     } else {
 477         if (sctx) {
 478             if (pctx->pmeth->signctx(pctx, sigret, siglen, ctx) <= 0)
 479                 return 0;
 480         } else {
 481             int s = EVP_MD_size(ctx->digest);
 482
 483             if (s < 0 || EVP_PKEY_sign(pctx, sigret, siglen, NULL, s) <= 0)
 484                 return 0;
 485         }
 486     }
 487     return 1;
 488 }
 489
 490 int EVP_DigestSign(EVP_MD_CTX *ctx, unsigned char *sigret, size_t *siglen,
 491                    const unsigned char *tbs, size_t tbslen)
 492 {
 493     EVP_PKEY_CTX *pctx = ctx->pctx;
 494
 495     if (pctx != NULL
 496             && pctx->operation == EVP_PKEY_OP_SIGNCTX
 497             && pctx->op.sig.sigprovctx != NULL
 498             && pctx->op.sig.signature != NULL) {
 499         if (pctx->op.sig.signature->digest_sign != NULL)
 500             return pctx->op.sig.signature->digest_sign(pctx->op.sig.sigprovctx,
 501                                                        sigret, siglen, SIZE_MAX,
 502                                                        tbs, tbslen);
 503     } else {
 504         /* legacy */
 505         if (ctx->pctx->pmeth != NULL && ctx->pctx->pmeth->digestsign != NULL)
 506             return ctx->pctx->pmeth->digestsign(ctx, sigret, siglen, tbs, tbslen);
 507     }
 508
 509     if (sigret != NULL && EVP_DigestSignUpdate(ctx, tbs, tbslen) <= 0)
 510         return 0;
 511     return EVP_DigestSignFinal(ctx, sigret, siglen);
 512 }
 513
 514 int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sig,
 515                           size_t siglen)
 516 {
 517     unsigned char md[EVP_MAX_MD_SIZE];
 518     int r = 0;
 519     unsigned int mdlen = 0;
 520     int vctx = 0;
 521     EVP_PKEY_CTX *pctx = ctx->pctx;
 522
 523     if (pctx == NULL
 524             || pctx->operation != EVP_PKEY_OP_VERIFYCTX
 525             || pctx->op.sig.sigprovctx == NULL
 526             || pctx->op.sig.signature == NULL)
 527         goto legacy;
 528
 529     return pctx->op.sig.signature->digest_verify_final(pctx->op.sig.sigprovctx,
 530                                                        sig, siglen);
 531
 532  legacy:
 533     if (pctx == NULL || pctx->pmeth == NULL) {
 534         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 535         return 0;
 536     }
 537
 538     /* do_sigver_init() checked that |digest_custom| is non-NULL */
 539     if (pctx->flag_call_digest_custom
 540         && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx))
 541         return 0;
 542     pctx->flag_call_digest_custom = 0;
 543
 544     if (pctx->pmeth->verifyctx != NULL)
 545         vctx = 1;
 546     else
 547         vctx = 0;
 548     if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) {
 549         if (vctx)
 550             r = pctx->pmeth->verifyctx(pctx, sig, siglen, ctx);
 551         else
 552             r = EVP_DigestFinal_ex(ctx, md, &mdlen);
 553     } else {
 554         EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
 555         if (tmp_ctx == NULL)
 556             return -1;
 557         if (!EVP_MD_CTX_copy_ex(tmp_ctx, ctx)) {
 558             EVP_MD_CTX_free(tmp_ctx);
 559             return -1;
 560         }
 561         if (vctx)
 562             r = tmp_ctx->pctx->pmeth->verifyctx(tmp_ctx->pctx,
 563                                                 sig, siglen, tmp_ctx);
 564         else
 565             r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen);
 566         EVP_MD_CTX_free(tmp_ctx);
 567     }
 568     if (vctx || !r)
 569         return r;
 570     return EVP_PKEY_verify(pctx, sig, siglen, md, mdlen);
 571 }
 572
 573 int EVP_DigestVerify(EVP_MD_CTX *ctx, const unsigned char *sigret,
 574                      size_t siglen, const unsigned char *tbs, size_t tbslen)
 575 {
 576     EVP_PKEY_CTX *pctx = ctx->pctx;
 577
 578     if (pctx != NULL
 579             && pctx->operation == EVP_PKEY_OP_VERIFYCTX
 580             && pctx->op.sig.sigprovctx != NULL
 581             && pctx->op.sig.signature != NULL) {
 582         if (pctx->op.sig.signature->digest_verify != NULL)
 583             return pctx->op.sig.signature->digest_verify(pctx->op.sig.sigprovctx,
 584                                                          sigret, siglen,
 585                                                          tbs, tbslen);
 586     } else {
 587         /* legacy */
 588         if (ctx->pctx->pmeth != NULL && ctx->pctx->pmeth->digestverify != NULL)
 589             return ctx->pctx->pmeth->digestverify(ctx, sigret, siglen, tbs, tbslen);
 590     }
 591
 592     if (EVP_DigestVerifyUpdate(ctx, tbs, tbslen) <= 0)
 593         return -1;
 594     return EVP_DigestVerifyFinal(ctx, sigret, siglen);
 595 }
 596 #endif /* FIPS_MODULE */