crypto/evp/m_sigver.c

   1 /*
   2  * Copyright 2006-2021 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 "crypto/evp.h"
  15 #include "internal/provider.h"
  16 #include "internal/numbers.h"   /* includes SIZE_MAX */
  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     ERR_raise(ERR_LIB_EVP, 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                           OSSL_LIB_CTX *libctx, const char *props,
  42                           ENGINE *e, EVP_PKEY *pkey, int ver,
  43                           const OSSL_PARAM params[])
  44 {
  45     EVP_PKEY_CTX *locpctx = NULL;
  46     EVP_SIGNATURE *signature = NULL;
  47     EVP_KEYMGMT *tmp_keymgmt = NULL;
  48     const char *supported_sig = NULL;
  49     char locmdname[80] = "";     /* 80 chars should be enough */
  50     void *provkey = NULL;
  51     int ret;
  52
  53     if (ctx->algctx != NULL) {
  54         if (!ossl_assert(ctx->digest != NULL)) {
  55             ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
  56             return 0;
  57         }
  58         if (ctx->digest->freectx != NULL)
  59             ctx->digest->freectx(ctx->algctx);
  60         ctx->algctx = NULL;
  61     }
  62
  63     if (ctx->pctx == NULL) {
  64         if (e == NULL)
  65             ctx->pctx = EVP_PKEY_CTX_new_from_pkey(libctx, pkey, props);
  66         else
  67             ctx->pctx = EVP_PKEY_CTX_new(pkey, e);
  68     }
  69     if (ctx->pctx == NULL)
  70         return 0;
  71
  72     locpctx = ctx->pctx;
  73     evp_pkey_ctx_free_old_ops(locpctx);
  74
  75     if (props == NULL)
  76         props = locpctx->propquery;
  77
  78     ERR_set_mark();
  79
  80     if (evp_pkey_ctx_is_legacy(locpctx))
  81         goto legacy;
  82
  83     /*
  84      * Ensure that the key is provided, either natively, or as a cached export.
  85      */
  86     tmp_keymgmt = locpctx->keymgmt;
  87     provkey = evp_pkey_export_to_provider(locpctx->pkey, locpctx->libctx,
  88                                           &tmp_keymgmt, locpctx->propquery);
  89     if (provkey == NULL) {
  90         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
  91         goto err;
  92     }
  93     if (!EVP_KEYMGMT_up_ref(tmp_keymgmt)) {
  94         ERR_clear_last_mark();
  95         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
  96         goto err;
  97     }
  98     EVP_KEYMGMT_free(locpctx->keymgmt);
  99     locpctx->keymgmt = tmp_keymgmt;
 100
 101     if (locpctx->keymgmt->query_operation_name != NULL)
 102         supported_sig =
 103             locpctx->keymgmt->query_operation_name(OSSL_OP_SIGNATURE);
 104
 105     /*
 106      * If we didn't get a supported sig, assume there is one with the
 107      * same name as the key type.
 108      */
 109     if (supported_sig == NULL)
 110         supported_sig = locpctx->keytype;
 111
 112     /*
 113      * Because we cleared out old ops, we shouldn't need to worry about
 114      * checking if signature is already there.
 115      */
 116     signature = EVP_SIGNATURE_fetch(locpctx->libctx, supported_sig,
 117                                     locpctx->propquery);
 118
 119     if (signature == NULL
 120         || (EVP_KEYMGMT_get0_provider(locpctx->keymgmt)
 121             != EVP_SIGNATURE_get0_provider(signature))) {
 122         /*
 123          * We don't need to free ctx->keymgmt here, as it's not necessarily
 124          * tied to this operation.  It will be freed by EVP_PKEY_CTX_free().
 125          */
 126         EVP_SIGNATURE_free(signature);
 127         goto legacy;
 128     }
 129
 130     /*
 131      * If we don't have the full support we need with provided methods,
 132      * let's go see if legacy does.
 133      */
 134     ERR_pop_to_mark();
 135
 136     /* No more legacy from here down to legacy: */
 137
 138     if (pctx != NULL)
 139         *pctx = locpctx;
 140
 141     locpctx->op.sig.signature = signature;
 142     locpctx->operation = ver ? EVP_PKEY_OP_VERIFYCTX
 143                              : EVP_PKEY_OP_SIGNCTX;
 144     locpctx->op.sig.algctx
 145         = signature->newctx(ossl_provider_ctx(signature->prov), props);
 146     if (locpctx->op.sig.algctx == NULL) {
 147         ERR_raise(ERR_LIB_EVP,  EVP_R_INITIALIZATION_ERROR);
 148         goto err;
 149     }
 150     if (type != NULL) {
 151         ctx->reqdigest = type;
 152         if (mdname == NULL)
 153             mdname = canon_mdname(EVP_MD_get0_name(type));
 154     } else {
 155         if (mdname == NULL) {
 156             if (evp_keymgmt_util_get_deflt_digest_name(tmp_keymgmt, provkey,
 157                                                        locmdname,
 158                                                        sizeof(locmdname)) > 0) {
 159                 mdname = canon_mdname(locmdname);
 160             }
 161         }
 162
 163         if (mdname != NULL) {
 164             /*
 165              * We're about to get a new digest so clear anything associated with
 166              * an old digest.
 167              */
 168             evp_md_ctx_clear_digest(ctx, 1);
 169
 170             /* legacy code support for engines */
 171             ERR_set_mark();
 172             /*
 173              * This might be requested by a later call to EVP_MD_CTX_get0_md().
 174              * In that case the "explicit fetch" rules apply for that
 175              * function (as per man pages), i.e. the ref count is not updated
 176              * so the EVP_MD should not be used beyound the lifetime of the
 177              * EVP_MD_CTX.
 178              */
 179             ctx->fetched_digest = EVP_MD_fetch(locpctx->libctx, mdname, props);
 180             if (ctx->fetched_digest != NULL) {
 181                 ctx->digest = ctx->reqdigest = ctx->fetched_digest;
 182             } else {
 183                 /* legacy engine support : remove the mark when this is deleted */
 184                 ctx->reqdigest = ctx->digest = EVP_get_digestbyname(mdname);
 185                 if (ctx->digest == NULL) {
 186                     (void)ERR_clear_last_mark();
 187                     ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 188                     goto err;
 189                 }
 190             }
 191             (void)ERR_pop_to_mark();
 192         }
 193     }
 194
 195     if (ver) {
 196         if (signature->digest_verify_init == NULL) {
 197             ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 198             goto err;
 199         }
 200         ret = signature->digest_verify_init(locpctx->op.sig.algctx,
 201                                             mdname, provkey, params);
 202     } else {
 203         if (signature->digest_sign_init == NULL) {
 204             ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 205             goto err;
 206         }
 207         ret = signature->digest_sign_init(locpctx->op.sig.algctx,
 208                                           mdname, provkey, params);
 209     }
 210
 211     /*
 212      * If the operation was not a success and no digest was found, an error
 213      * needs to be raised.
 214      */
 215     if (ret > 0 || mdname != NULL)
 216         goto end;
 217     if (type == NULL)   /* This check is redundant but clarifies matters */
 218         ERR_raise(ERR_LIB_EVP, EVP_R_NO_DEFAULT_DIGEST);
 219
 220  err:
 221     evp_pkey_ctx_free_old_ops(locpctx);
 222     locpctx->operation = EVP_PKEY_OP_UNDEFINED;
 223     return 0;
 224
 225  legacy:
 226     /*
 227      * If we don't have the full support we need with provided methods,
 228      * let's go see if legacy does.
 229      */
 230     ERR_pop_to_mark();
 231
 232     if (type == NULL && mdname != NULL)
 233         type = evp_get_digestbyname_ex(locpctx->libctx, mdname);
 234
 235     if (ctx->pctx->pmeth == NULL) {
 236         ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 237         return 0;
 238     }
 239
 240     if (!(ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)) {
 241
 242         if (type == NULL) {
 243             int def_nid;
 244             if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) > 0)
 245                 type = EVP_get_digestbynid(def_nid);
 246         }
 247
 248         if (type == NULL) {
 249             ERR_raise(ERR_LIB_EVP, EVP_R_NO_DEFAULT_DIGEST);
 250             return 0;
 251         }
 252     }
 253
 254     if (ver) {
 255         if (ctx->pctx->pmeth->verifyctx_init) {
 256             if (ctx->pctx->pmeth->verifyctx_init(ctx->pctx, ctx) <= 0)
 257                 return 0;
 258             ctx->pctx->operation = EVP_PKEY_OP_VERIFYCTX;
 259         } else if (ctx->pctx->pmeth->digestverify != 0) {
 260             ctx->pctx->operation = EVP_PKEY_OP_VERIFY;
 261             ctx->update = update;
 262         } else if (EVP_PKEY_verify_init(ctx->pctx) <= 0) {
 263             return 0;
 264         }
 265     } else {
 266         if (ctx->pctx->pmeth->signctx_init) {
 267             if (ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx) <= 0)
 268                 return 0;
 269             ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX;
 270         } else if (ctx->pctx->pmeth->digestsign != 0) {
 271             ctx->pctx->operation = EVP_PKEY_OP_SIGN;
 272             ctx->update = update;
 273         } else if (EVP_PKEY_sign_init(ctx->pctx) <= 0) {
 274             return 0;
 275         }
 276     }
 277     if (EVP_PKEY_CTX_set_signature_md(ctx->pctx, type) <= 0)
 278         return 0;
 279     if (pctx)
 280         *pctx = ctx->pctx;
 281     if (ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)
 282         return 1;
 283     if (!EVP_DigestInit_ex(ctx, type, e))
 284         return 0;
 285     /*
 286      * This indicates the current algorithm requires
 287      * special treatment before hashing the tbs-message.
 288      */
 289     ctx->pctx->flag_call_digest_custom = 0;
 290     if (ctx->pctx->pmeth->digest_custom != NULL)
 291         ctx->pctx->flag_call_digest_custom = 1;
 292
 293     ret = 1;
 294
 295  end:
 296 #ifndef FIPS_MODULE
 297     if (ret > 0)
 298         ret = evp_pkey_ctx_use_cached_data(locpctx);
 299 #endif
 300
 301     return ret > 0 ? 1 : 0;
 302 }
 303
 304 int EVP_DigestSignInit_ex(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 305                           const char *mdname, OSSL_LIB_CTX *libctx,
 306                           const char *props, EVP_PKEY *pkey,
 307                           const OSSL_PARAM params[])
 308 {
 309     return do_sigver_init(ctx, pctx, NULL, mdname, libctx, props, NULL, pkey, 0,
 310                           params);
 311 }
 312
 313 int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 314                        const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
 315 {
 316     return do_sigver_init(ctx, pctx, type, NULL, NULL, NULL, e, pkey, 0,
 317                           NULL);
 318 }
 319
 320 int EVP_DigestVerifyInit_ex(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 321                             const char *mdname, OSSL_LIB_CTX *libctx,
 322                             const char *props, EVP_PKEY *pkey,
 323                             const OSSL_PARAM params[])
 324 {
 325     return do_sigver_init(ctx, pctx, NULL, mdname, libctx, props, NULL, pkey, 1,
 326                           params);
 327 }
 328
 329 int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 330                          const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
 331 {
 332     return do_sigver_init(ctx, pctx, type, NULL, NULL, NULL, e, pkey, 1,
 333                           NULL);
 334 }
 335 #endif /* FIPS_MDOE */
 336
 337 int EVP_DigestSignUpdate(EVP_MD_CTX *ctx, const void *data, size_t dsize)
 338 {
 339     EVP_PKEY_CTX *pctx = ctx->pctx;
 340
 341     if (pctx == NULL
 342             || pctx->operation != EVP_PKEY_OP_SIGNCTX
 343             || pctx->op.sig.algctx == NULL
 344             || pctx->op.sig.signature == NULL)
 345         goto legacy;
 346
 347     if (pctx->op.sig.signature->digest_sign_update == NULL) {
 348         ERR_raise(ERR_LIB_EVP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 349         return 0;
 350     }
 351
 352     return pctx->op.sig.signature->digest_sign_update(pctx->op.sig.algctx,
 353                                                       data, dsize);
 354
 355  legacy:
 356     if (pctx != NULL) {
 357         /* do_sigver_init() checked that |digest_custom| is non-NULL */
 358         if (pctx->flag_call_digest_custom
 359             && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx))
 360             return 0;
 361         pctx->flag_call_digest_custom = 0;
 362     }
 363
 364     return EVP_DigestUpdate(ctx, data, dsize);
 365 }
 366
 367 int EVP_DigestVerifyUpdate(EVP_MD_CTX *ctx, const void *data, size_t dsize)
 368 {
 369     EVP_PKEY_CTX *pctx = ctx->pctx;
 370
 371     if (pctx == NULL
 372             || pctx->operation != EVP_PKEY_OP_VERIFYCTX
 373             || pctx->op.sig.algctx == NULL
 374             || pctx->op.sig.signature == NULL)
 375         goto legacy;
 376
 377     if (pctx->op.sig.signature->digest_verify_update == NULL) {
 378         ERR_raise(ERR_LIB_EVP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 379         return 0;
 380     }
 381
 382     return pctx->op.sig.signature->digest_verify_update(pctx->op.sig.algctx,
 383                                                         data, dsize);
 384
 385  legacy:
 386     if (pctx != NULL) {
 387         /* do_sigver_init() checked that |digest_custom| is non-NULL */
 388         if (pctx->flag_call_digest_custom
 389             && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx))
 390             return 0;
 391         pctx->flag_call_digest_custom = 0;
 392     }
 393
 394     return EVP_DigestUpdate(ctx, data, dsize);
 395 }
 396
 397 #ifndef FIPS_MODULE
 398 int EVP_DigestSignFinal(EVP_MD_CTX *ctx, unsigned char *sigret,
 399                         size_t *siglen)
 400 {
 401     int sctx = 0, r = 0;
 402     EVP_PKEY_CTX *pctx = ctx->pctx;
 403
 404     if (pctx == NULL
 405             || pctx->operation != EVP_PKEY_OP_SIGNCTX
 406             || pctx->op.sig.algctx == NULL
 407             || pctx->op.sig.signature == NULL)
 408         goto legacy;
 409
 410     return pctx->op.sig.signature->digest_sign_final(pctx->op.sig.algctx,
 411                                                      sigret, siglen, SIZE_MAX);
 412
 413  legacy:
 414     if (pctx == NULL || pctx->pmeth == NULL) {
 415         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 416         return 0;
 417     }
 418
 419     /* do_sigver_init() checked that |digest_custom| is non-NULL */
 420     if (pctx->flag_call_digest_custom
 421         && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx))
 422         return 0;
 423     pctx->flag_call_digest_custom = 0;
 424
 425     if (pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM) {
 426         if (sigret == NULL)
 427             return pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
 428         if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE)
 429             r = pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
 430         else {
 431             EVP_PKEY_CTX *dctx = EVP_PKEY_CTX_dup(pctx);
 432
 433             if (dctx == NULL)
 434                 return 0;
 435             r = dctx->pmeth->signctx(dctx, sigret, siglen, ctx);
 436             EVP_PKEY_CTX_free(dctx);
 437         }
 438         return r;
 439     }
 440     if (pctx->pmeth->signctx != NULL)
 441         sctx = 1;
 442     else
 443         sctx = 0;
 444     if (sigret != NULL) {
 445         unsigned char md[EVP_MAX_MD_SIZE];
 446         unsigned int mdlen = 0;
 447
 448         if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) {
 449             if (sctx)
 450                 r = pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
 451             else
 452                 r = EVP_DigestFinal_ex(ctx, md, &mdlen);
 453         } else {
 454             EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
 455
 456             if (tmp_ctx == NULL)
 457                 return 0;
 458             if (!EVP_MD_CTX_copy_ex(tmp_ctx, ctx)) {
 459                 EVP_MD_CTX_free(tmp_ctx);
 460                 return 0;
 461             }
 462             if (sctx)
 463                 r = tmp_ctx->pctx->pmeth->signctx(tmp_ctx->pctx,
 464                                                   sigret, siglen, tmp_ctx);
 465             else
 466                 r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen);
 467             EVP_MD_CTX_free(tmp_ctx);
 468         }
 469         if (sctx || !r)
 470             return r;
 471         if (EVP_PKEY_sign(pctx, sigret, siglen, md, mdlen) <= 0)
 472             return 0;
 473     } else {
 474         if (sctx) {
 475             if (pctx->pmeth->signctx(pctx, sigret, siglen, ctx) <= 0)
 476                 return 0;
 477         } else {
 478             int s = EVP_MD_get_size(ctx->digest);
 479
 480             if (s < 0 || EVP_PKEY_sign(pctx, sigret, siglen, NULL, s) <= 0)
 481                 return 0;
 482         }
 483     }
 484     return 1;
 485 }
 486
 487 int EVP_DigestSign(EVP_MD_CTX *ctx, unsigned char *sigret, size_t *siglen,
 488                    const unsigned char *tbs, size_t tbslen)
 489 {
 490     EVP_PKEY_CTX *pctx = ctx->pctx;
 491
 492     if (pctx != NULL
 493             && pctx->operation == EVP_PKEY_OP_SIGNCTX
 494             && pctx->op.sig.algctx != NULL
 495             && pctx->op.sig.signature != NULL) {
 496         if (pctx->op.sig.signature->digest_sign != NULL)
 497             return pctx->op.sig.signature->digest_sign(pctx->op.sig.algctx,
 498                                                        sigret, siglen, SIZE_MAX,
 499                                                        tbs, tbslen);
 500     } else {
 501         /* legacy */
 502         if (ctx->pctx->pmeth != NULL && ctx->pctx->pmeth->digestsign != NULL)
 503             return ctx->pctx->pmeth->digestsign(ctx, sigret, siglen, tbs, tbslen);
 504     }
 505
 506     if (sigret != NULL && EVP_DigestSignUpdate(ctx, tbs, tbslen) <= 0)
 507         return 0;
 508     return EVP_DigestSignFinal(ctx, sigret, siglen);
 509 }
 510
 511 int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sig,
 512                           size_t siglen)
 513 {
 514     unsigned char md[EVP_MAX_MD_SIZE];
 515     int r = 0;
 516     unsigned int mdlen = 0;
 517     int vctx = 0;
 518     EVP_PKEY_CTX *pctx = ctx->pctx;
 519
 520     if (pctx == NULL
 521             || pctx->operation != EVP_PKEY_OP_VERIFYCTX
 522             || pctx->op.sig.algctx == NULL
 523             || pctx->op.sig.signature == NULL)
 524         goto legacy;
 525
 526     return pctx->op.sig.signature->digest_verify_final(pctx->op.sig.algctx,
 527                                                        sig, siglen);
 528
 529  legacy:
 530     if (pctx == NULL || pctx->pmeth == NULL) {
 531         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 532         return 0;
 533     }
 534
 535     /* do_sigver_init() checked that |digest_custom| is non-NULL */
 536     if (pctx->flag_call_digest_custom
 537         && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx))
 538         return 0;
 539     pctx->flag_call_digest_custom = 0;
 540
 541     if (pctx->pmeth->verifyctx != NULL)
 542         vctx = 1;
 543     else
 544         vctx = 0;
 545     if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) {
 546         if (vctx)
 547             r = pctx->pmeth->verifyctx(pctx, sig, siglen, ctx);
 548         else
 549             r = EVP_DigestFinal_ex(ctx, md, &mdlen);
 550     } else {
 551         EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
 552         if (tmp_ctx == NULL)
 553             return -1;
 554         if (!EVP_MD_CTX_copy_ex(tmp_ctx, ctx)) {
 555             EVP_MD_CTX_free(tmp_ctx);
 556             return -1;
 557         }
 558         if (vctx)
 559             r = tmp_ctx->pctx->pmeth->verifyctx(tmp_ctx->pctx,
 560                                                 sig, siglen, tmp_ctx);
 561         else
 562             r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen);
 563         EVP_MD_CTX_free(tmp_ctx);
 564     }
 565     if (vctx || !r)
 566         return r;
 567     return EVP_PKEY_verify(pctx, sig, siglen, md, mdlen);
 568 }
 569
 570 int EVP_DigestVerify(EVP_MD_CTX *ctx, const unsigned char *sigret,
 571                      size_t siglen, const unsigned char *tbs, size_t tbslen)
 572 {
 573     EVP_PKEY_CTX *pctx = ctx->pctx;
 574
 575     if (pctx != NULL
 576             && pctx->operation == EVP_PKEY_OP_VERIFYCTX
 577             && pctx->op.sig.algctx != NULL
 578             && pctx->op.sig.signature != NULL) {
 579         if (pctx->op.sig.signature->digest_verify != NULL)
 580             return pctx->op.sig.signature->digest_verify(pctx->op.sig.algctx,
 581                                                          sigret, siglen,
 582                                                          tbs, tbslen);
 583     } else {
 584         /* legacy */
 585         if (ctx->pctx->pmeth != NULL && ctx->pctx->pmeth->digestverify != NULL)
 586             return ctx->pctx->pmeth->digestverify(ctx, sigret, siglen, tbs, tbslen);
 587     }
 588
 589     if (EVP_DigestVerifyUpdate(ctx, tbs, tbslen) <= 0)
 590         return -1;
 591     return EVP_DigestVerifyFinal(ctx, sigret, siglen);
 592 }
 593 #endif /* FIPS_MODULE */