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      * Try to derive the supported signature from |locpctx->keymgmt|.
  85      */
  86     if (!ossl_assert(locpctx->pkey->keymgmt == NULL
  87                      || locpctx->pkey->keymgmt == locpctx->keymgmt)) {
  88         ERR_clear_last_mark();
  89         ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);
  90         goto err;
  91     }
  92     supported_sig = evp_keymgmt_util_query_operation_name(locpctx->keymgmt,
  93                                                           OSSL_OP_SIGNATURE);
  94     if (supported_sig == NULL) {
  95         ERR_clear_last_mark();
  96         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
  97         goto err;
  98     }
  99
 100     /*
 101      * Because we cleared out old ops, we shouldn't need to worry about
 102      * checking if signature is already there.
 103      */
 104     signature = EVP_SIGNATURE_fetch(locpctx->libctx, supported_sig,
 105                                     locpctx->propquery);
 106
 107     if (signature == NULL)
 108         goto legacy;
 109
 110     /*
 111      * Ensure that the key is provided, either natively, or as a cached export.
 112      * We start by fetching the keymgmt with the same name as |locpctx->pkey|,
 113      * but from the provider of the signature method, using the same property
 114      * query as when fetching the signature method.
 115      * With the keymgmt we found (if we did), we try to export |locpctx->pkey|
 116      * to it (evp_pkey_export_to_provider() is smart enough to only actually
 117
 118      * export it if |tmp_keymgmt| is different from |locpctx->pkey|'s keymgmt)
 119      */
 120     tmp_keymgmt
 121         = evp_keymgmt_fetch_from_prov(EVP_SIGNATURE_get0_provider(signature),
 122                                       EVP_KEYMGMT_get0_name(locpctx->keymgmt),
 123                                       locpctx->propquery);
 124     if (tmp_keymgmt != NULL)
 125         provkey = evp_pkey_export_to_provider(locpctx->pkey, locpctx->libctx,
 126                                               &tmp_keymgmt, locpctx->propquery);
 127     if (provkey == NULL) {
 128         ERR_clear_last_mark();
 129         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 130         goto err;
 131     }
 132
 133     ERR_pop_to_mark();
 134
 135     /* No more legacy from here down to legacy: */
 136
 137     if (pctx != NULL)
 138         *pctx = locpctx;
 139
 140     locpctx->op.sig.signature = signature;
 141     locpctx->operation = ver ? EVP_PKEY_OP_VERIFYCTX
 142                              : EVP_PKEY_OP_SIGNCTX;
 143     locpctx->op.sig.algctx
 144         = signature->newctx(ossl_provider_ctx(signature->prov), props);
 145     if (locpctx->op.sig.algctx == NULL) {
 146         ERR_raise(ERR_LIB_EVP,  EVP_R_INITIALIZATION_ERROR);
 147         goto err;
 148     }
 149     if (type != NULL) {
 150         ctx->reqdigest = type;
 151         if (mdname == NULL)
 152             mdname = canon_mdname(EVP_MD_get0_name(type));
 153     } else {
 154         if (mdname == NULL) {
 155             if (evp_keymgmt_util_get_deflt_digest_name(tmp_keymgmt, provkey,
 156                                                        locmdname,
 157                                                        sizeof(locmdname)) > 0) {
 158                 mdname = canon_mdname(locmdname);
 159             }
 160         }
 161
 162         if (mdname != NULL) {
 163             /*
 164              * We're about to get a new digest so clear anything associated with
 165              * an old digest.
 166              */
 167             evp_md_ctx_clear_digest(ctx, 1);
 168
 169             /* legacy code support for engines */
 170             ERR_set_mark();
 171             /*
 172              * This might be requested by a later call to EVP_MD_CTX_get0_md().
 173              * In that case the "explicit fetch" rules apply for that
 174              * function (as per man pages), i.e. the ref count is not updated
 175              * so the EVP_MD should not be used beyound the lifetime of the
 176              * EVP_MD_CTX.
 177              */
 178             ctx->fetched_digest = EVP_MD_fetch(locpctx->libctx, mdname, props);
 179             if (ctx->fetched_digest != NULL) {
 180                 ctx->digest = ctx->reqdigest = ctx->fetched_digest;
 181             } else {
 182                 /* legacy engine support : remove the mark when this is deleted */
 183                 ctx->reqdigest = ctx->digest = EVP_get_digestbyname(mdname);
 184                 if (ctx->digest == NULL) {
 185                     (void)ERR_clear_last_mark();
 186                     ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 187                     goto err;
 188                 }
 189             }
 190             (void)ERR_pop_to_mark();
 191         }
 192     }
 193
 194     if (ver) {
 195         if (signature->digest_verify_init == NULL) {
 196             ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 197             goto err;
 198         }
 199         ret = signature->digest_verify_init(locpctx->op.sig.algctx,
 200                                             mdname, provkey, params);
 201     } else {
 202         if (signature->digest_sign_init == NULL) {
 203             ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 204             goto err;
 205         }
 206         ret = signature->digest_sign_init(locpctx->op.sig.algctx,
 207                                           mdname, provkey, params);
 208     }
 209
 210     /*
 211      * If the operation was not a success and no digest was found, an error
 212      * needs to be raised.
 213      */
 214     if (ret > 0 || mdname != NULL)
 215         goto end;
 216     if (type == NULL)   /* This check is redundant but clarifies matters */
 217         ERR_raise(ERR_LIB_EVP, EVP_R_NO_DEFAULT_DIGEST);
 218
 219  err:
 220     evp_pkey_ctx_free_old_ops(locpctx);
 221     locpctx->operation = EVP_PKEY_OP_UNDEFINED;
 222     EVP_KEYMGMT_free(tmp_keymgmt);
 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     EVP_KEYMGMT_free(tmp_keymgmt);
 232     tmp_keymgmt = NULL;
 233
 234     if (type == NULL && mdname != NULL)
 235         type = evp_get_digestbyname_ex(locpctx->libctx, mdname);
 236
 237     if (ctx->pctx->pmeth == NULL) {
 238         ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 239         return 0;
 240     }
 241
 242     if (!(ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)) {
 243
 244         if (type == NULL) {
 245             int def_nid;
 246             if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) > 0)
 247                 type = EVP_get_digestbynid(def_nid);
 248         }
 249
 250         if (type == NULL) {
 251             ERR_raise(ERR_LIB_EVP, EVP_R_NO_DEFAULT_DIGEST);
 252             return 0;
 253         }
 254     }
 255
 256     if (ver) {
 257         if (ctx->pctx->pmeth->verifyctx_init) {
 258             if (ctx->pctx->pmeth->verifyctx_init(ctx->pctx, ctx) <= 0)
 259                 return 0;
 260             ctx->pctx->operation = EVP_PKEY_OP_VERIFYCTX;
 261         } else if (ctx->pctx->pmeth->digestverify != 0) {
 262             ctx->pctx->operation = EVP_PKEY_OP_VERIFY;
 263             ctx->update = update;
 264         } else if (EVP_PKEY_verify_init(ctx->pctx) <= 0) {
 265             return 0;
 266         }
 267     } else {
 268         if (ctx->pctx->pmeth->signctx_init) {
 269             if (ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx) <= 0)
 270                 return 0;
 271             ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX;
 272         } else if (ctx->pctx->pmeth->digestsign != 0) {
 273             ctx->pctx->operation = EVP_PKEY_OP_SIGN;
 274             ctx->update = update;
 275         } else if (EVP_PKEY_sign_init(ctx->pctx) <= 0) {
 276             return 0;
 277         }
 278     }
 279     if (EVP_PKEY_CTX_set_signature_md(ctx->pctx, type) <= 0)
 280         return 0;
 281     if (pctx)
 282         *pctx = ctx->pctx;
 283     if (ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)
 284         return 1;
 285     if (!EVP_DigestInit_ex(ctx, type, e))
 286         return 0;
 287     /*
 288      * This indicates the current algorithm requires
 289      * special treatment before hashing the tbs-message.
 290      */
 291     ctx->pctx->flag_call_digest_custom = 0;
 292     if (ctx->pctx->pmeth->digest_custom != NULL)
 293         ctx->pctx->flag_call_digest_custom = 1;
 294
 295     ret = 1;
 296
 297  end:
 298 #ifndef FIPS_MODULE
 299     if (ret > 0)
 300         ret = evp_pkey_ctx_use_cached_data(locpctx);
 301 #endif
 302
 303     EVP_KEYMGMT_free(tmp_keymgmt);
 304     return ret > 0 ? 1 : 0;
 305 }
 306
 307 int EVP_DigestSignInit_ex(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 308                           const char *mdname, OSSL_LIB_CTX *libctx,
 309                           const char *props, EVP_PKEY *pkey,
 310                           const OSSL_PARAM params[])
 311 {
 312     return do_sigver_init(ctx, pctx, NULL, mdname, libctx, props, NULL, pkey, 0,
 313                           params);
 314 }
 315
 316 int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 317                        const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
 318 {
 319     return do_sigver_init(ctx, pctx, type, NULL, NULL, NULL, e, pkey, 0,
 320                           NULL);
 321 }
 322
 323 int EVP_DigestVerifyInit_ex(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 324                             const char *mdname, OSSL_LIB_CTX *libctx,
 325                             const char *props, EVP_PKEY *pkey,
 326                             const OSSL_PARAM params[])
 327 {
 328     return do_sigver_init(ctx, pctx, NULL, mdname, libctx, props, NULL, pkey, 1,
 329                           params);
 330 }
 331
 332 int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 333                          const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
 334 {
 335     return do_sigver_init(ctx, pctx, type, NULL, NULL, NULL, e, pkey, 1,
 336                           NULL);
 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.algctx == 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.algctx,
 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.algctx == 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.algctx,
 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 *dctx, *pctx = ctx->pctx;
 406
 407     if (pctx == NULL
 408             || pctx->operation != EVP_PKEY_OP_SIGNCTX
 409             || pctx->op.sig.algctx == NULL
 410             || pctx->op.sig.signature == NULL)
 411         goto legacy;
 412
 413     if (sigret == NULL || (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) != 0)
 414         return pctx->op.sig.signature->digest_sign_final(pctx->op.sig.algctx,
 415                                                          sigret, siglen,
 416                                                          (sigret == NULL) ? 0 : *siglen);
 417     dctx = EVP_PKEY_CTX_dup(pctx);
 418     if (dctx == NULL)
 419         return 0;
 420
 421     r = dctx->op.sig.signature->digest_sign_final(dctx->op.sig.algctx,
 422                                                   sigret, siglen,
 423                                                   (sigret == NULL) ? 0 : *siglen);
 424     EVP_PKEY_CTX_free(dctx);
 425     return r;
 426
 427  legacy:
 428     if (pctx == NULL || pctx->pmeth == NULL) {
 429         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 430         return 0;
 431     }
 432
 433     /* do_sigver_init() checked that |digest_custom| is non-NULL */
 434     if (pctx->flag_call_digest_custom
 435         && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx))
 436         return 0;
 437     pctx->flag_call_digest_custom = 0;
 438
 439     if (pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM) {
 440         if (sigret == NULL)
 441             return pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
 442         if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE)
 443             r = pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
 444         else {
 445             dctx = EVP_PKEY_CTX_dup(pctx);
 446             if (dctx == NULL)
 447                 return 0;
 448             r = dctx->pmeth->signctx(dctx, sigret, siglen, ctx);
 449             EVP_PKEY_CTX_free(dctx);
 450         }
 451         return r;
 452     }
 453     if (pctx->pmeth->signctx != NULL)
 454         sctx = 1;
 455     else
 456         sctx = 0;
 457     if (sigret != NULL) {
 458         unsigned char md[EVP_MAX_MD_SIZE];
 459         unsigned int mdlen = 0;
 460
 461         if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) {
 462             if (sctx)
 463                 r = pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
 464             else
 465                 r = EVP_DigestFinal_ex(ctx, md, &mdlen);
 466         } else {
 467             EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
 468
 469             if (tmp_ctx == NULL)
 470                 return 0;
 471             if (!EVP_MD_CTX_copy_ex(tmp_ctx, ctx)) {
 472                 EVP_MD_CTX_free(tmp_ctx);
 473                 return 0;
 474             }
 475             if (sctx)
 476                 r = tmp_ctx->pctx->pmeth->signctx(tmp_ctx->pctx,
 477                                                   sigret, siglen, tmp_ctx);
 478             else
 479                 r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen);
 480             EVP_MD_CTX_free(tmp_ctx);
 481         }
 482         if (sctx || !r)
 483             return r;
 484         if (EVP_PKEY_sign(pctx, sigret, siglen, md, mdlen) <= 0)
 485             return 0;
 486     } else {
 487         if (sctx) {
 488             if (pctx->pmeth->signctx(pctx, sigret, siglen, ctx) <= 0)
 489                 return 0;
 490         } else {
 491             int s = EVP_MD_get_size(ctx->digest);
 492
 493             if (s < 0 || EVP_PKEY_sign(pctx, sigret, siglen, NULL, s) <= 0)
 494                 return 0;
 495         }
 496     }
 497     return 1;
 498 }
 499
 500 int EVP_DigestSign(EVP_MD_CTX *ctx, unsigned char *sigret, size_t *siglen,
 501                    const unsigned char *tbs, size_t tbslen)
 502 {
 503     EVP_PKEY_CTX *pctx = ctx->pctx;
 504
 505     if (pctx != NULL
 506             && pctx->operation == EVP_PKEY_OP_SIGNCTX
 507             && pctx->op.sig.algctx != NULL
 508             && pctx->op.sig.signature != NULL) {
 509         if (pctx->op.sig.signature->digest_sign != NULL)
 510             return pctx->op.sig.signature->digest_sign(pctx->op.sig.algctx,
 511                                                        sigret, siglen,
 512                                                        sigret == NULL ? 0 : *siglen,
 513                                                        tbs, tbslen);
 514     } else {
 515         /* legacy */
 516         if (ctx->pctx->pmeth != NULL && ctx->pctx->pmeth->digestsign != NULL)
 517             return ctx->pctx->pmeth->digestsign(ctx, sigret, siglen, tbs, tbslen);
 518     }
 519
 520     if (sigret != NULL && EVP_DigestSignUpdate(ctx, tbs, tbslen) <= 0)
 521         return 0;
 522     return EVP_DigestSignFinal(ctx, sigret, siglen);
 523 }
 524
 525 int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sig,
 526                           size_t siglen)
 527 {
 528     unsigned char md[EVP_MAX_MD_SIZE];
 529     int r = 0;
 530     unsigned int mdlen = 0;
 531     int vctx = 0;
 532     EVP_PKEY_CTX *dctx, *pctx = ctx->pctx;
 533
 534     if (pctx == NULL
 535             || pctx->operation != EVP_PKEY_OP_VERIFYCTX
 536             || pctx->op.sig.algctx == NULL
 537             || pctx->op.sig.signature == NULL)
 538         goto legacy;
 539
 540     if ((ctx->flags & EVP_MD_CTX_FLAG_FINALISE) != 0)
 541         return pctx->op.sig.signature->digest_verify_final(pctx->op.sig.algctx,
 542                                                            sig, siglen);
 543     dctx = EVP_PKEY_CTX_dup(pctx);
 544     if (dctx == NULL)
 545         return 0;
 546
 547     r = dctx->op.sig.signature->digest_verify_final(dctx->op.sig.algctx,
 548                                                     sig, siglen);
 549     EVP_PKEY_CTX_free(dctx);
 550     return r;
 551
 552  legacy:
 553     if (pctx == NULL || pctx->pmeth == NULL) {
 554         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 555         return 0;
 556     }
 557
 558     /* do_sigver_init() checked that |digest_custom| is non-NULL */
 559     if (pctx->flag_call_digest_custom
 560         && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx))
 561         return 0;
 562     pctx->flag_call_digest_custom = 0;
 563
 564     if (pctx->pmeth->verifyctx != NULL)
 565         vctx = 1;
 566     else
 567         vctx = 0;
 568     if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) {
 569         if (vctx)
 570             r = pctx->pmeth->verifyctx(pctx, sig, siglen, ctx);
 571         else
 572             r = EVP_DigestFinal_ex(ctx, md, &mdlen);
 573     } else {
 574         EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
 575         if (tmp_ctx == NULL)
 576             return -1;
 577         if (!EVP_MD_CTX_copy_ex(tmp_ctx, ctx)) {
 578             EVP_MD_CTX_free(tmp_ctx);
 579             return -1;
 580         }
 581         if (vctx)
 582             r = tmp_ctx->pctx->pmeth->verifyctx(tmp_ctx->pctx,
 583                                                 sig, siglen, tmp_ctx);
 584         else
 585             r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen);
 586         EVP_MD_CTX_free(tmp_ctx);
 587     }
 588     if (vctx || !r)
 589         return r;
 590     return EVP_PKEY_verify(pctx, sig, siglen, md, mdlen);
 591 }
 592
 593 int EVP_DigestVerify(EVP_MD_CTX *ctx, const unsigned char *sigret,
 594                      size_t siglen, const unsigned char *tbs, size_t tbslen)
 595 {
 596     EVP_PKEY_CTX *pctx = ctx->pctx;
 597
 598     if (pctx != NULL
 599             && pctx->operation == EVP_PKEY_OP_VERIFYCTX
 600             && pctx->op.sig.algctx != NULL
 601             && pctx->op.sig.signature != NULL) {
 602         if (pctx->op.sig.signature->digest_verify != NULL)
 603             return pctx->op.sig.signature->digest_verify(pctx->op.sig.algctx,
 604                                                          sigret, siglen,
 605                                                          tbs, tbslen);
 606     } else {
 607         /* legacy */
 608         if (ctx->pctx->pmeth != NULL && ctx->pctx->pmeth->digestverify != NULL)
 609             return ctx->pctx->pmeth->digestverify(ctx, sigret, siglen, tbs, tbslen);
 610     }
 611
 612     if (EVP_DigestVerifyUpdate(ctx, tbs, tbslen) <= 0)
 613         return -1;
 614     return EVP_DigestVerifyFinal(ctx, sigret, siglen);
 615 }
 616 #endif /* FIPS_MODULE */