crypto/evp/signature.c

   1 /*
   2  * Copyright 2006-2016 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 <stdlib.h>
  12 #include <openssl/objects.h>
  13 #include <openssl/evp.h>
  14 #include "internal/cryptlib.h"
  15 #include "crypto/evp.h"
  16 #include "internal/provider.h"
  17 #include "evp_local.h"
  18
  19 static EVP_SIGNATURE *evp_signature_new(OSSL_PROVIDER *prov)
  20 {
  21     EVP_SIGNATURE *signature = OPENSSL_zalloc(sizeof(EVP_SIGNATURE));
  22
  23     if (signature == NULL) {
  24         ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
  25         return NULL;
  26     }
  27
  28     signature->lock = CRYPTO_THREAD_lock_new();
  29     if (signature->lock == NULL) {
  30         ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
  31         OPENSSL_free(signature);
  32         return NULL;
  33     }
  34     signature->prov = prov;
  35     ossl_provider_up_ref(prov);
  36     signature->refcnt = 1;
  37
  38     return signature;
  39 }
  40
  41 static void *evp_signature_from_dispatch(int name_id,
  42                                          const OSSL_DISPATCH *fns,
  43                                          OSSL_PROVIDER *prov)
  44 {
  45     EVP_SIGNATURE *signature = NULL;
  46     int ctxfncnt = 0, signfncnt = 0, verifyfncnt = 0, verifyrecfncnt = 0;
  47     int digsignfncnt = 0, digverifyfncnt = 0;
  48     int gparamfncnt = 0, sparamfncnt = 0, gmdparamfncnt = 0, smdparamfncnt = 0;
  49
  50     if ((signature = evp_signature_new(prov)) == NULL) {
  51         ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
  52         goto err;
  53     }
  54
  55     signature->name_id = name_id;
  56
  57     for (; fns->function_id != 0; fns++) {
  58         switch (fns->function_id) {
  59         case OSSL_FUNC_SIGNATURE_NEWCTX:
  60             if (signature->newctx != NULL)
  61                 break;
  62             signature->newctx = OSSL_get_OP_signature_newctx(fns);
  63             ctxfncnt++;
  64             break;
  65         case OSSL_FUNC_SIGNATURE_SIGN_INIT:
  66             if (signature->sign_init != NULL)
  67                 break;
  68             signature->sign_init = OSSL_get_OP_signature_sign_init(fns);
  69             signfncnt++;
  70             break;
  71         case OSSL_FUNC_SIGNATURE_SIGN:
  72             if (signature->sign != NULL)
  73                 break;
  74             signature->sign = OSSL_get_OP_signature_sign(fns);
  75             signfncnt++;
  76             break;
  77         case OSSL_FUNC_SIGNATURE_VERIFY_INIT:
  78             if (signature->verify_init != NULL)
  79                 break;
  80             signature->verify_init = OSSL_get_OP_signature_verify_init(fns);
  81             verifyfncnt++;
  82             break;
  83         case OSSL_FUNC_SIGNATURE_VERIFY:
  84             if (signature->verify != NULL)
  85                 break;
  86             signature->verify = OSSL_get_OP_signature_verify(fns);
  87             verifyfncnt++;
  88             break;
  89         case OSSL_FUNC_SIGNATURE_VERIFY_RECOVER_INIT:
  90             if (signature->verify_recover_init != NULL)
  91                 break;
  92             signature->verify_recover_init
  93                 = OSSL_get_OP_signature_verify_recover_init(fns);
  94             verifyrecfncnt++;
  95             break;
  96         case OSSL_FUNC_SIGNATURE_VERIFY_RECOVER:
  97             if (signature->verify_recover != NULL)
  98                 break;
  99             signature->verify_recover
 100                 = OSSL_get_OP_signature_verify_recover(fns);
 101             verifyrecfncnt++;
 102             break;
 103         case OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT:
 104             if (signature->digest_sign_init != NULL)
 105                 break;
 106             signature->digest_sign_init
 107                 = OSSL_get_OP_signature_digest_sign_init(fns);
 108             digsignfncnt++;
 109             break;
 110         case OSSL_FUNC_SIGNATURE_DIGEST_SIGN_UPDATE:
 111             if (signature->digest_sign_update != NULL)
 112                 break;
 113             signature->digest_sign_update
 114                 = OSSL_get_OP_signature_digest_sign_update(fns);
 115             digsignfncnt++;
 116             break;
 117         case OSSL_FUNC_SIGNATURE_DIGEST_SIGN_FINAL:
 118             if (signature->digest_sign_final != NULL)
 119                 break;
 120             signature->digest_sign_final
 121                 = OSSL_get_OP_signature_digest_sign_final(fns);
 122             digsignfncnt++;
 123             break;
 124         case OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT:
 125             if (signature->digest_verify_init != NULL)
 126                 break;
 127             signature->digest_verify_init
 128                 = OSSL_get_OP_signature_digest_verify_init(fns);
 129             digverifyfncnt++;
 130             break;
 131         case OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_UPDATE:
 132             if (signature->digest_verify_update != NULL)
 133                 break;
 134             signature->digest_verify_update
 135                 = OSSL_get_OP_signature_digest_verify_update(fns);
 136             digverifyfncnt++;
 137             break;
 138         case OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_FINAL:
 139             if (signature->digest_verify_final != NULL)
 140                 break;
 141             signature->digest_verify_final
 142                 = OSSL_get_OP_signature_digest_verify_final(fns);
 143             digverifyfncnt++;
 144             break;
 145         case OSSL_FUNC_SIGNATURE_FREECTX:
 146             if (signature->freectx != NULL)
 147                 break;
 148             signature->freectx = OSSL_get_OP_signature_freectx(fns);
 149             ctxfncnt++;
 150             break;
 151         case OSSL_FUNC_SIGNATURE_DUPCTX:
 152             if (signature->dupctx != NULL)
 153                 break;
 154             signature->dupctx = OSSL_get_OP_signature_dupctx(fns);
 155             break;
 156         case OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS:
 157             if (signature->get_ctx_params != NULL)
 158                 break;
 159             signature->get_ctx_params
 160                 = OSSL_get_OP_signature_get_ctx_params(fns);
 161             gparamfncnt++;
 162             break;
 163         case OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS:
 164             if (signature->gettable_ctx_params != NULL)
 165                 break;
 166             signature->gettable_ctx_params
 167                 = OSSL_get_OP_signature_gettable_ctx_params(fns);
 168             gparamfncnt++;
 169             break;
 170         case OSSL_FUNC_SIGNATURE_SET_CTX_PARAMS:
 171             if (signature->set_ctx_params != NULL)
 172                 break;
 173             signature->set_ctx_params
 174                 = OSSL_get_OP_signature_set_ctx_params(fns);
 175             sparamfncnt++;
 176             break;
 177         case OSSL_FUNC_SIGNATURE_SETTABLE_CTX_PARAMS:
 178             if (signature->settable_ctx_params != NULL)
 179                 break;
 180             signature->settable_ctx_params
 181                 = OSSL_get_OP_signature_settable_ctx_params(fns);
 182             sparamfncnt++;
 183             break;
 184         case OSSL_FUNC_SIGNATURE_GET_CTX_MD_PARAMS:
 185             if (signature->get_ctx_md_params != NULL)
 186                 break;
 187             signature->get_ctx_md_params
 188                 = OSSL_get_OP_signature_get_ctx_md_params(fns);
 189             gmdparamfncnt++;
 190             break;
 191         case OSSL_FUNC_SIGNATURE_GETTABLE_CTX_MD_PARAMS:
 192             if (signature->gettable_ctx_md_params != NULL)
 193                 break;
 194             signature->gettable_ctx_md_params
 195                 = OSSL_get_OP_signature_gettable_ctx_md_params(fns);
 196             gmdparamfncnt++;
 197             break;
 198         case OSSL_FUNC_SIGNATURE_SET_CTX_MD_PARAMS:
 199             if (signature->set_ctx_md_params != NULL)
 200                 break;
 201             signature->set_ctx_md_params
 202                 = OSSL_get_OP_signature_set_ctx_md_params(fns);
 203             smdparamfncnt++;
 204             break;
 205         case OSSL_FUNC_SIGNATURE_SETTABLE_CTX_MD_PARAMS:
 206             if (signature->settable_ctx_md_params != NULL)
 207                 break;
 208             signature->settable_ctx_md_params
 209                 = OSSL_get_OP_signature_settable_ctx_md_params(fns);
 210             smdparamfncnt++;
 211             break;
 212         }
 213     }
 214     if (ctxfncnt != 2
 215         || (signfncnt == 0
 216             && verifyfncnt == 0
 217             && verifyrecfncnt == 0
 218             && digsignfncnt == 0
 219             && digverifyfncnt == 0)
 220         || (signfncnt != 0 && signfncnt != 2)
 221         || (verifyfncnt != 0 && verifyfncnt != 2)
 222         || (verifyrecfncnt != 0 && verifyrecfncnt != 2)
 223         || (digsignfncnt != 0 && digsignfncnt != 3)
 224         || (digverifyfncnt != 0 && digverifyfncnt != 3)
 225         || (gparamfncnt != 0 && gparamfncnt != 2)
 226         || (sparamfncnt != 0 && sparamfncnt != 2)
 227         || (gmdparamfncnt != 0 && gmdparamfncnt != 2)
 228         || (smdparamfncnt != 0 && smdparamfncnt != 2)) {
 229         /*
 230          * In order to be a consistent set of functions we must have at least
 231          * a set of context functions (newctx and freectx) as well as a set of
 232          * "signature" functions:
 233          *  (sign_init, sign) or
 234          *  (verify_init verify) or
 235          *  (verify_recover_init, verify_recover) or
 236          *  (digest_sign_init, digest_sign_update, digest_sign_final) or
 237          *  (digest_verify_init, digest_verify_update, digest_verify_final).
 238          *
 239          * set_ctx_params and settable_ctx_params are optional, but if one of
 240          * them is present then the other one must also be present. The same
 241          * applies to get_ctx_params and gettable_ctx_params. The same rules
 242          * apply to the "md_params" functions. The dupctx function is optional.
 243          */
 244         ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS);
 245         goto err;
 246     }
 247
 248     return signature;
 249  err:
 250     EVP_SIGNATURE_free(signature);
 251     return NULL;
 252 }
 253
 254 void EVP_SIGNATURE_free(EVP_SIGNATURE *signature)
 255 {
 256     if (signature != NULL) {
 257         int i;
 258
 259         CRYPTO_DOWN_REF(&signature->refcnt, &i, signature->lock);
 260         if (i > 0)
 261             return;
 262         ossl_provider_free(signature->prov);
 263         CRYPTO_THREAD_lock_free(signature->lock);
 264         OPENSSL_free(signature);
 265     }
 266 }
 267
 268 int EVP_SIGNATURE_up_ref(EVP_SIGNATURE *signature)
 269 {
 270     int ref = 0;
 271
 272     CRYPTO_UP_REF(&signature->refcnt, &ref, signature->lock);
 273     return 1;
 274 }
 275
 276 OSSL_PROVIDER *EVP_SIGNATURE_provider(const EVP_SIGNATURE *signature)
 277 {
 278     return signature->prov;
 279 }
 280
 281 EVP_SIGNATURE *EVP_SIGNATURE_fetch(OPENSSL_CTX *ctx, const char *algorithm,
 282                                    const char *properties)
 283 {
 284     return evp_generic_fetch(ctx, OSSL_OP_SIGNATURE, algorithm, properties,
 285                              evp_signature_from_dispatch,
 286                              (int (*)(void *))EVP_SIGNATURE_up_ref,
 287                              (void (*)(void *))EVP_SIGNATURE_free);
 288 }
 289
 290 int EVP_SIGNATURE_is_a(const EVP_SIGNATURE *signature, const char *name)
 291 {
 292     return evp_is_a(signature->prov, signature->name_id, NULL, name);
 293 }
 294
 295 int EVP_SIGNATURE_number(const EVP_SIGNATURE *signature)
 296 {
 297     return signature->name_id;
 298 }
 299
 300 void EVP_SIGNATURE_do_all_provided(OPENSSL_CTX *libctx,
 301                                    void (*fn)(EVP_SIGNATURE *signature,
 302                                               void *arg),
 303                                    void *arg)
 304 {
 305     evp_generic_do_all(libctx, OSSL_OP_SIGNATURE,
 306                        (void (*)(void *, void *))fn, arg,
 307                        evp_signature_from_dispatch,
 308                        (void (*)(void *))EVP_SIGNATURE_free);
 309 }
 310
 311
 312 void EVP_SIGNATURE_names_do_all(const EVP_SIGNATURE *signature,
 313                                 void (*fn)(const char *name, void *data),
 314                                 void *data)
 315 {
 316     if (signature->prov != NULL)
 317         evp_names_do_all(signature->prov, signature->name_id, fn, data);
 318 }
 319
 320 static int evp_pkey_signature_init(EVP_PKEY_CTX *ctx, int operation)
 321 {
 322     int ret = 0;
 323     void *provkey = NULL;
 324     EVP_SIGNATURE *signature = NULL;
 325     EVP_KEYMGMT *tmp_keymgmt = NULL;
 326     const char *supported_sig = NULL;
 327
 328     if (ctx == NULL) {
 329         EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 330         return -2;
 331     }
 332
 333     evp_pkey_ctx_free_old_ops(ctx);
 334     ctx->operation = operation;
 335
 336     /*
 337      * TODO when we stop falling back to legacy, this and the ERR_pop_to_mark()
 338      * calls can be removed.
 339      */
 340     ERR_set_mark();
 341
 342     if (ctx->keytype == NULL)
 343         goto legacy;
 344
 345     /*
 346      * Ensure that the key is provided, either natively, or as a cached export.
 347      *  If not, go legacy
 348      */
 349     tmp_keymgmt = ctx->keymgmt;
 350     provkey = evp_pkey_export_to_provider(ctx->pkey, ctx->libctx,
 351                                           &tmp_keymgmt, ctx->propquery);
 352     if (provkey == NULL)
 353         goto legacy;
 354     if (!EVP_KEYMGMT_up_ref(tmp_keymgmt)) {
 355         ERR_clear_last_mark();
 356         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 357         goto err;
 358     }
 359     EVP_KEYMGMT_free(ctx->keymgmt);
 360     ctx->keymgmt = tmp_keymgmt;
 361
 362     if (ctx->keymgmt->query_operation_name != NULL)
 363         supported_sig = ctx->keymgmt->query_operation_name(OSSL_OP_SIGNATURE);
 364
 365     /*
 366      * If we didn't get a supported sig, assume there is one with the
 367      * same name as the key type.
 368      */
 369     if (supported_sig == NULL)
 370         supported_sig = ctx->keytype;
 371
 372     /*
 373      * Because we cleared out old ops, we shouldn't need to worry about
 374      * checking if signature is already there.
 375      */
 376     signature =
 377         EVP_SIGNATURE_fetch(ctx->libctx, supported_sig, ctx->propquery);
 378
 379     if (signature == NULL
 380         || (EVP_KEYMGMT_provider(ctx->keymgmt)
 381             != EVP_SIGNATURE_provider(signature))) {
 382         /*
 383          * We don't need to free ctx->keymgmt here, as it's not necessarily
 384          * tied to this operation.  It will be freed by EVP_PKEY_CTX_free().
 385          */
 386         EVP_SIGNATURE_free(signature);
 387         goto legacy;
 388     }
 389
 390     /*
 391      * TODO remove this when legacy is gone
 392      * If we don't have the full support we need with provided methods,
 393      * let's go see if legacy does.
 394      */
 395     ERR_pop_to_mark();
 396
 397     /* No more legacy from here down to legacy: */
 398
 399     ctx->op.sig.signature = signature;
 400     ctx->op.sig.sigprovctx = signature->newctx(ossl_provider_ctx(signature->prov));
 401     if (ctx->op.sig.sigprovctx == NULL) {
 402         /* The provider key can stay in the cache */
 403         EVPerr(0, EVP_R_INITIALIZATION_ERROR);
 404         goto err;
 405     }
 406
 407     switch (operation) {
 408     case EVP_PKEY_OP_SIGN:
 409         if (signature->sign_init == NULL) {
 410             EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 411             ret = -2;
 412             goto err;
 413         }
 414         ret = signature->sign_init(ctx->op.sig.sigprovctx, provkey);
 415         break;
 416     case EVP_PKEY_OP_VERIFY:
 417         if (signature->verify_init == NULL) {
 418             EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 419             ret = -2;
 420             goto err;
 421         }
 422         ret = signature->verify_init(ctx->op.sig.sigprovctx, provkey);
 423         break;
 424     case EVP_PKEY_OP_VERIFYRECOVER:
 425         if (signature->verify_recover_init == NULL) {
 426             EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 427             ret = -2;
 428             goto err;
 429         }
 430         ret = signature->verify_recover_init(ctx->op.sig.sigprovctx, provkey);
 431         break;
 432     default:
 433         EVPerr(0, EVP_R_INITIALIZATION_ERROR);
 434         goto err;
 435     }
 436
 437     if (ret <= 0) {
 438         signature->freectx(ctx->op.sig.sigprovctx);
 439         ctx->op.sig.sigprovctx = NULL;
 440         goto err;
 441     }
 442     return 1;
 443
 444  legacy:
 445     /*
 446      * TODO remove this when legacy is gone
 447      * If we don't have the full support we need with provided methods,
 448      * let's go see if legacy does.
 449      */
 450     ERR_pop_to_mark();
 451
 452     if (ctx->pmeth == NULL
 453             || (operation == EVP_PKEY_OP_SIGN && ctx->pmeth->sign == NULL)
 454             || (operation == EVP_PKEY_OP_VERIFY && ctx->pmeth->verify == NULL)
 455             || (operation == EVP_PKEY_OP_VERIFYRECOVER
 456                 && ctx->pmeth->verify_recover == NULL)) {
 457         EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 458         return -2;
 459     }
 460
 461     switch (operation) {
 462     case EVP_PKEY_OP_SIGN:
 463         if (ctx->pmeth->sign_init == NULL)
 464             return 1;
 465         ret = ctx->pmeth->sign_init(ctx);
 466         break;
 467     case EVP_PKEY_OP_VERIFY:
 468         if (ctx->pmeth->verify_init == NULL)
 469             return 1;
 470         ret = ctx->pmeth->verify_init(ctx);
 471         break;
 472     case EVP_PKEY_OP_VERIFYRECOVER:
 473         if (ctx->pmeth->verify_recover_init == NULL)
 474             return 1;
 475         ret = ctx->pmeth->verify_recover_init(ctx);
 476         break;
 477     default:
 478         EVPerr(0, EVP_R_INITIALIZATION_ERROR);
 479         goto err;
 480     }
 481     if (ret <= 0)
 482         goto err;
 483     return ret;
 484
 485  err:
 486     ctx->operation = EVP_PKEY_OP_UNDEFINED;
 487     return ret;
 488 }
 489
 490 int EVP_PKEY_sign_init(EVP_PKEY_CTX *ctx)
 491 {
 492     return evp_pkey_signature_init(ctx, EVP_PKEY_OP_SIGN);
 493 }
 494
 495 int EVP_PKEY_sign(EVP_PKEY_CTX *ctx,
 496                   unsigned char *sig, size_t *siglen,
 497                   const unsigned char *tbs, size_t tbslen)
 498 {
 499     int ret;
 500
 501     if (ctx == NULL) {
 502         EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 503         return -2;
 504     }
 505
 506     if (ctx->operation != EVP_PKEY_OP_SIGN) {
 507         EVPerr(0, EVP_R_OPERATON_NOT_INITIALIZED);
 508         return -1;
 509     }
 510
 511     if (ctx->op.sig.sigprovctx == NULL)
 512         goto legacy;
 513
 514     ret = ctx->op.sig.signature->sign(ctx->op.sig.sigprovctx, sig, siglen,
 515                                       SIZE_MAX, tbs, tbslen);
 516
 517     return ret;
 518  legacy:
 519
 520     if (ctx->pmeth == NULL || ctx->pmeth->sign == NULL) {
 521         EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 522         return -2;
 523     }
 524
 525     M_check_autoarg(ctx, sig, siglen, EVP_F_EVP_PKEY_SIGN)
 526         return ctx->pmeth->sign(ctx, sig, siglen, tbs, tbslen);
 527 }
 528
 529 int EVP_PKEY_verify_init(EVP_PKEY_CTX *ctx)
 530 {
 531     return evp_pkey_signature_init(ctx, EVP_PKEY_OP_VERIFY);
 532 }
 533
 534 int EVP_PKEY_verify(EVP_PKEY_CTX *ctx,
 535                     const unsigned char *sig, size_t siglen,
 536                     const unsigned char *tbs, size_t tbslen)
 537 {
 538     int ret;
 539
 540     if (ctx == NULL) {
 541         EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 542         return -2;
 543     }
 544
 545     if (ctx->operation != EVP_PKEY_OP_VERIFY) {
 546         EVPerr(0, EVP_R_OPERATON_NOT_INITIALIZED);
 547         return -1;
 548     }
 549
 550     if (ctx->op.sig.sigprovctx == NULL)
 551         goto legacy;
 552
 553     ret = ctx->op.sig.signature->verify(ctx->op.sig.sigprovctx, sig, siglen,
 554                                         tbs, tbslen);
 555
 556     return ret;
 557  legacy:
 558     if (ctx->pmeth == NULL || ctx->pmeth->verify == NULL) {
 559         EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 560         return -2;
 561     }
 562
 563     return ctx->pmeth->verify(ctx, sig, siglen, tbs, tbslen);
 564 }
 565
 566 int EVP_PKEY_verify_recover_init(EVP_PKEY_CTX *ctx)
 567 {
 568     return evp_pkey_signature_init(ctx, EVP_PKEY_OP_VERIFYRECOVER);
 569 }
 570
 571 int EVP_PKEY_verify_recover(EVP_PKEY_CTX *ctx,
 572                             unsigned char *rout, size_t *routlen,
 573                             const unsigned char *sig, size_t siglen)
 574 {
 575     int ret;
 576
 577     if (ctx == NULL) {
 578         EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 579         return -2;
 580     }
 581
 582     if (ctx->operation != EVP_PKEY_OP_VERIFYRECOVER) {
 583         EVPerr(0, EVP_R_OPERATON_NOT_INITIALIZED);
 584         return -1;
 585     }
 586
 587     if (ctx->op.sig.sigprovctx == NULL)
 588         goto legacy;
 589
 590     ret = ctx->op.sig.signature->verify_recover(ctx->op.sig.sigprovctx, rout,
 591                                                 routlen,
 592                                                 (rout == NULL ? 0 : *routlen),
 593                                                 sig, siglen);
 594     return ret;
 595  legacy:
 596     if (ctx->pmeth == NULL || ctx->pmeth->verify_recover == NULL) {
 597         EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 598         return -2;
 599     }
 600     M_check_autoarg(ctx, rout, routlen, EVP_F_EVP_PKEY_VERIFY_RECOVER)
 601         return ctx->pmeth->verify_recover(ctx, rout, routlen, sig, siglen);
 602 }