providers/implementations/signature/ecdsa_sig.c

   1 /*
   2  * Copyright 2020-2021 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 /*
  11  * ECDSA low level APIs are deprecated for public use, but still ok for
  12  * internal use.
  13  */
  14 #include "internal/deprecated.h"
  15
  16 #include <string.h> /* memcpy */
  17 #include <openssl/crypto.h>
  18 #include <openssl/core_dispatch.h>
  19 #include <openssl/core_names.h>
  20 #include <openssl/dsa.h>
  21 #include <openssl/params.h>
  22 #include <openssl/evp.h>
  23 #include <openssl/err.h>
  24 #include <openssl/proverr.h>
  25 #include "internal/nelem.h"
  26 #include "internal/sizes.h"
  27 #include "internal/cryptlib.h"
  28 #include "prov/providercommon.h"
  29 #include "prov/implementations.h"
  30 #include "prov/provider_ctx.h"
  31 #include "prov/securitycheck.h"
  32 #include "crypto/ec.h"
  33 #include "prov/der_ec.h"
  34
  35 static OSSL_FUNC_signature_newctx_fn ecdsa_newctx;
  36 static OSSL_FUNC_signature_sign_init_fn ecdsa_sign_init;
  37 static OSSL_FUNC_signature_verify_init_fn ecdsa_verify_init;
  38 static OSSL_FUNC_signature_sign_fn ecdsa_sign;
  39 static OSSL_FUNC_signature_verify_fn ecdsa_verify;
  40 static OSSL_FUNC_signature_digest_sign_init_fn ecdsa_digest_sign_init;
  41 static OSSL_FUNC_signature_digest_sign_update_fn ecdsa_digest_signverify_update;
  42 static OSSL_FUNC_signature_digest_sign_final_fn ecdsa_digest_sign_final;
  43 static OSSL_FUNC_signature_digest_verify_init_fn ecdsa_digest_verify_init;
  44 static OSSL_FUNC_signature_digest_verify_update_fn ecdsa_digest_signverify_update;
  45 static OSSL_FUNC_signature_digest_verify_final_fn ecdsa_digest_verify_final;
  46 static OSSL_FUNC_signature_freectx_fn ecdsa_freectx;
  47 static OSSL_FUNC_signature_dupctx_fn ecdsa_dupctx;
  48 static OSSL_FUNC_signature_get_ctx_params_fn ecdsa_get_ctx_params;
  49 static OSSL_FUNC_signature_gettable_ctx_params_fn ecdsa_gettable_ctx_params;
  50 static OSSL_FUNC_signature_set_ctx_params_fn ecdsa_set_ctx_params;
  51 static OSSL_FUNC_signature_settable_ctx_params_fn ecdsa_settable_ctx_params;
  52 static OSSL_FUNC_signature_get_ctx_md_params_fn ecdsa_get_ctx_md_params;
  53 static OSSL_FUNC_signature_gettable_ctx_md_params_fn ecdsa_gettable_ctx_md_params;
  54 static OSSL_FUNC_signature_set_ctx_md_params_fn ecdsa_set_ctx_md_params;
  55 static OSSL_FUNC_signature_settable_ctx_md_params_fn ecdsa_settable_ctx_md_params;
  56
  57 /*
  58  * What's passed as an actual key is defined by the KEYMGMT interface.
  59  * We happen to know that our KEYMGMT simply passes DSA structures, so
  60  * we use that here too.
  61  */
  62
  63 typedef struct {
  64     OSSL_LIB_CTX *libctx;
  65     char *propq;
  66     EC_KEY *ec;
  67     char mdname[OSSL_MAX_NAME_SIZE];
  68
  69     /*
  70      * Flag to determine if the hash function can be changed (1) or not (0)
  71      * Because it's dangerous to change during a DigestSign or DigestVerify
  72      * operation, this flag is cleared by their Init function, and set again
  73      * by their Final function.
  74      */
  75     unsigned int flag_allow_md : 1;
  76
  77     /* The Algorithm Identifier of the combined signature algorithm */
  78     unsigned char aid_buf[OSSL_MAX_ALGORITHM_ID_SIZE];
  79     unsigned char *aid;
  80     size_t  aid_len;
  81     size_t mdsize;
  82     int operation;
  83
  84     EVP_MD *md;
  85     EVP_MD_CTX *mdctx;
  86     /*
  87      * Internally used to cache the results of calling the EC group
  88      * sign_setup() methods which are then passed to the sign operation.
  89      * This is used by CAVS failure tests to terminate a loop if the signature
  90      * is not valid.
  91      * This could of also been done with a simple flag.
  92      */
  93     BIGNUM *kinv;
  94     BIGNUM *r;
  95 #if !defined(OPENSSL_NO_ACVP_TESTS)
  96     /*
  97      * This indicates that KAT (CAVS) test is running. Externally an app will
  98      * override the random callback such that the generated private key and k
  99      * are known.
 100      * Normal operation will loop to choose a new k if the signature is not
 101      * valid - but for this mode of operation it forces a failure instead.
 102      */
 103     unsigned int kattest;
 104 #endif
 105 } PROV_ECDSA_CTX;
 106
 107 static void *ecdsa_newctx(void *provctx, const char *propq)
 108 {
 109     PROV_ECDSA_CTX *ctx;
 110
 111     if (!ossl_prov_is_running())
 112         return NULL;
 113
 114     ctx = OPENSSL_zalloc(sizeof(PROV_ECDSA_CTX));
 115     if (ctx == NULL)
 116         return NULL;
 117
 118     ctx->flag_allow_md = 1;
 119     ctx->libctx = PROV_LIBCTX_OF(provctx);
 120     if (propq != NULL && (ctx->propq = OPENSSL_strdup(propq)) == NULL) {
 121         OPENSSL_free(ctx);
 122         ctx = NULL;
 123         ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
 124     }
 125     return ctx;
 126 }
 127
 128 static int ecdsa_signverify_init(void *vctx, void *ec,
 129                                  const OSSL_PARAM params[], int operation)
 130 {
 131     PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
 132
 133     if (!ossl_prov_is_running()
 134             || ctx == NULL
 135             || ec == NULL
 136             || !EC_KEY_up_ref(ec))
 137         return 0;
 138     EC_KEY_free(ctx->ec);
 139     ctx->ec = ec;
 140     ctx->operation = operation;
 141     if (!ecdsa_set_ctx_params(ctx, params))
 142         return 0;
 143     return ossl_ec_check_key(ctx->libctx, ec, operation == EVP_PKEY_OP_SIGN);
 144 }
 145
 146 static int ecdsa_sign_init(void *vctx, void *ec, const OSSL_PARAM params[])
 147 {
 148     return ecdsa_signverify_init(vctx, ec, params, EVP_PKEY_OP_SIGN);
 149 }
 150
 151 static int ecdsa_verify_init(void *vctx, void *ec, const OSSL_PARAM params[])
 152 {
 153     return ecdsa_signverify_init(vctx, ec, params, EVP_PKEY_OP_VERIFY);
 154 }
 155
 156 static int ecdsa_sign(void *vctx, unsigned char *sig, size_t *siglen,
 157                       size_t sigsize, const unsigned char *tbs, size_t tbslen)
 158 {
 159     PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
 160     int ret;
 161     unsigned int sltmp;
 162     size_t ecsize = ECDSA_size(ctx->ec);
 163
 164     if (!ossl_prov_is_running())
 165         return 0;
 166
 167     if (sig == NULL) {
 168         *siglen = ecsize;
 169         return 1;
 170     }
 171
 172 #if !defined(OPENSSL_NO_ACVP_TESTS)
 173     if (ctx->kattest && !ECDSA_sign_setup(ctx->ec, NULL, &ctx->kinv, &ctx->r))
 174         return 0;
 175 #endif
 176
 177     if (sigsize < (size_t)ecsize)
 178         return 0;
 179
 180     if (ctx->mdsize != 0 && tbslen != ctx->mdsize)
 181         return 0;
 182
 183     ret = ECDSA_sign_ex(0, tbs, tbslen, sig, &sltmp, ctx->kinv, ctx->r, ctx->ec);
 184     if (ret <= 0)
 185         return 0;
 186
 187     *siglen = sltmp;
 188     return 1;
 189 }
 190
 191 static int ecdsa_verify(void *vctx, const unsigned char *sig, size_t siglen,
 192                         const unsigned char *tbs, size_t tbslen)
 193 {
 194     PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
 195
 196     if (!ossl_prov_is_running() || (ctx->mdsize != 0 && tbslen != ctx->mdsize))
 197         return 0;
 198
 199     return ECDSA_verify(0, tbs, tbslen, sig, siglen, ctx->ec);
 200 }
 201
 202 static int ecdsa_setup_md(PROV_ECDSA_CTX *ctx, const char *mdname,
 203                           const char *mdprops)
 204 {
 205     EVP_MD *md = NULL;
 206     size_t mdname_len;
 207     int md_nid, sha1_allowed;
 208     WPACKET pkt;
 209
 210     if (mdname == NULL)
 211         return 1;
 212
 213     mdname_len = strlen(mdname);
 214     if (mdname_len >= sizeof(ctx->mdname)) {
 215         ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
 216                        "%s exceeds name buffer length", mdname);
 217         return 0;
 218     }
 219     if (mdprops == NULL)
 220         mdprops = ctx->propq;
 221     md = EVP_MD_fetch(ctx->libctx, mdname, mdprops);
 222     if (md == NULL) {
 223         ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
 224                        "%s could not be fetched", mdname);
 225         return 0;
 226     }
 227     sha1_allowed = (ctx->operation != EVP_PKEY_OP_SIGN);
 228     md_nid = ossl_digest_get_approved_nid_with_sha1(ctx->libctx, md,
 229                                                     sha1_allowed);
 230     if (md_nid < 0) {
 231         ERR_raise_data(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED,
 232                        "digest=%s", mdname);
 233         EVP_MD_free(md);
 234         return 0;
 235     }
 236
 237     EVP_MD_CTX_free(ctx->mdctx);
 238     EVP_MD_free(ctx->md);
 239
 240     ctx->aid_len = 0;
 241     if (WPACKET_init_der(&pkt, ctx->aid_buf, sizeof(ctx->aid_buf))
 242         && ossl_DER_w_algorithmIdentifier_ECDSA_with_MD(&pkt, -1, ctx->ec,
 243                                                         md_nid)
 244         && WPACKET_finish(&pkt)) {
 245         WPACKET_get_total_written(&pkt, &ctx->aid_len);
 246         ctx->aid = WPACKET_get_curr(&pkt);
 247     }
 248     WPACKET_cleanup(&pkt);
 249     ctx->mdctx = NULL;
 250     ctx->md = md;
 251     ctx->mdsize = EVP_MD_size(ctx->md);
 252     OPENSSL_strlcpy(ctx->mdname, mdname, sizeof(ctx->mdname));
 253
 254     return 1;
 255 }
 256
 257 static int ecdsa_digest_signverify_init(void *vctx, const char *mdname,
 258                                         void *ec, const OSSL_PARAM params[],
 259                                         int operation)
 260 {
 261     PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
 262
 263     if (!ossl_prov_is_running())
 264         return 0;
 265
 266     ctx->flag_allow_md = 0;
 267     if (!ecdsa_signverify_init(vctx, ec, params, operation)
 268         || !ecdsa_setup_md(ctx, mdname, NULL))
 269         return 0;
 270
 271     ctx->mdctx = EVP_MD_CTX_new();
 272     if (ctx->mdctx == NULL)
 273         goto error;
 274
 275     if (!EVP_DigestInit_ex2(ctx->mdctx, ctx->md, params))
 276         goto error;
 277     return 1;
 278 error:
 279     EVP_MD_CTX_free(ctx->mdctx);
 280     EVP_MD_free(ctx->md);
 281     ctx->mdctx = NULL;
 282     ctx->md = NULL;
 283     return 0;
 284 }
 285
 286 static int ecdsa_digest_sign_init(void *vctx, const char *mdname, void *ec,
 287                                   const OSSL_PARAM params[])
 288 {
 289     return ecdsa_digest_signverify_init(vctx, mdname, ec, params,
 290                                         EVP_PKEY_OP_SIGN);
 291 }
 292
 293 static int ecdsa_digest_verify_init(void *vctx, const char *mdname, void *ec,
 294                                     const OSSL_PARAM params[])
 295 {
 296     return ecdsa_digest_signverify_init(vctx, mdname, ec, params,
 297                                         EVP_PKEY_OP_VERIFY);
 298 }
 299
 300 int ecdsa_digest_signverify_update(void *vctx, const unsigned char *data,
 301                                    size_t datalen)
 302 {
 303     PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
 304
 305     if (ctx == NULL || ctx->mdctx == NULL)
 306         return 0;
 307
 308     return EVP_DigestUpdate(ctx->mdctx, data, datalen);
 309 }
 310
 311 int ecdsa_digest_sign_final(void *vctx, unsigned char *sig, size_t *siglen,
 312                             size_t sigsize)
 313 {
 314     PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
 315     unsigned char digest[EVP_MAX_MD_SIZE];
 316     unsigned int dlen = 0;
 317
 318     if (!ossl_prov_is_running() || ctx == NULL || ctx->mdctx == NULL)
 319         return 0;
 320
 321     /*
 322      * If sig is NULL then we're just finding out the sig size. Other fields
 323      * are ignored. Defer to ecdsa_sign.
 324      */
 325     if (sig != NULL
 326         && !EVP_DigestFinal_ex(ctx->mdctx, digest, &dlen))
 327         return 0;
 328     ctx->flag_allow_md = 1;
 329     return ecdsa_sign(vctx, sig, siglen, sigsize, digest, (size_t)dlen);
 330 }
 331
 332 int ecdsa_digest_verify_final(void *vctx, const unsigned char *sig,
 333                               size_t siglen)
 334 {
 335     PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
 336     unsigned char digest[EVP_MAX_MD_SIZE];
 337     unsigned int dlen = 0;
 338
 339     if (!ossl_prov_is_running() || ctx == NULL || ctx->mdctx == NULL)
 340         return 0;
 341
 342     if (!EVP_DigestFinal_ex(ctx->mdctx, digest, &dlen))
 343         return 0;
 344     ctx->flag_allow_md = 1;
 345     return ecdsa_verify(ctx, sig, siglen, digest, (size_t)dlen);
 346 }
 347
 348 static void ecdsa_freectx(void *vctx)
 349 {
 350     PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
 351
 352     OPENSSL_free(ctx->propq);
 353     EVP_MD_CTX_free(ctx->mdctx);
 354     EVP_MD_free(ctx->md);
 355     ctx->propq = NULL;
 356     ctx->mdctx = NULL;
 357     ctx->md = NULL;
 358     ctx->mdsize = 0;
 359     EC_KEY_free(ctx->ec);
 360     BN_clear_free(ctx->kinv);
 361     BN_clear_free(ctx->r);
 362     OPENSSL_free(ctx);
 363 }
 364
 365 static void *ecdsa_dupctx(void *vctx)
 366 {
 367     PROV_ECDSA_CTX *srcctx = (PROV_ECDSA_CTX *)vctx;
 368     PROV_ECDSA_CTX *dstctx;
 369
 370     if (!ossl_prov_is_running())
 371         return NULL;
 372
 373     dstctx = OPENSSL_zalloc(sizeof(*srcctx));
 374     if (dstctx == NULL)
 375         return NULL;
 376
 377     *dstctx = *srcctx;
 378     dstctx->ec = NULL;
 379     dstctx->md = NULL;
 380     dstctx->mdctx = NULL;
 381     dstctx->propq = NULL;
 382
 383     if (srcctx->ec != NULL && !EC_KEY_up_ref(srcctx->ec))
 384         goto err;
 385     /* Test KATS should not need to be supported */
 386     if (srcctx->kinv != NULL || srcctx->r != NULL)
 387         goto err;
 388     dstctx->ec = srcctx->ec;
 389
 390     if (srcctx->md != NULL && !EVP_MD_up_ref(srcctx->md))
 391         goto err;
 392     dstctx->md = srcctx->md;
 393
 394     if (srcctx->mdctx != NULL) {
 395         dstctx->mdctx = EVP_MD_CTX_new();
 396         if (dstctx->mdctx == NULL
 397                 || !EVP_MD_CTX_copy_ex(dstctx->mdctx, srcctx->mdctx))
 398             goto err;
 399     }
 400
 401     if (srcctx->propq != NULL) {
 402         dstctx->propq = OPENSSL_strdup(srcctx->propq);
 403         if (dstctx->propq == NULL)
 404             goto err;
 405     }
 406
 407     return dstctx;
 408  err:
 409     ecdsa_freectx(dstctx);
 410     return NULL;
 411 }
 412
 413 static int ecdsa_get_ctx_params(void *vctx, OSSL_PARAM *params)
 414 {
 415     PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
 416     OSSL_PARAM *p;
 417
 418     if (ctx == NULL)
 419         return 0;
 420
 421     p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_ALGORITHM_ID);
 422     if (p != NULL && !OSSL_PARAM_set_octet_string(p, ctx->aid, ctx->aid_len))
 423         return 0;
 424
 425     p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST_SIZE);
 426     if (p != NULL && !OSSL_PARAM_set_size_t(p, ctx->mdsize))
 427         return 0;
 428
 429     p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST);
 430     if (p != NULL && !OSSL_PARAM_set_utf8_string(p, ctx->md == NULL
 431                                                     ? ctx->mdname
 432                                                     : EVP_MD_name(ctx->md)))
 433         return 0;
 434
 435     return 1;
 436 }
 437
 438 static const OSSL_PARAM known_gettable_ctx_params[] = {
 439     OSSL_PARAM_octet_string(OSSL_SIGNATURE_PARAM_ALGORITHM_ID, NULL, 0),
 440     OSSL_PARAM_size_t(OSSL_SIGNATURE_PARAM_DIGEST_SIZE, NULL),
 441     OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
 442     OSSL_PARAM_END
 443 };
 444
 445 static const OSSL_PARAM *ecdsa_gettable_ctx_params(ossl_unused void *vctx,
 446                                                    ossl_unused void *provctx)
 447 {
 448     return known_gettable_ctx_params;
 449 }
 450
 451 static int ecdsa_set_ctx_params(void *vctx, const OSSL_PARAM params[])
 452 {
 453     PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
 454     const OSSL_PARAM *p;
 455
 456     if (ctx == NULL)
 457         return 0;
 458     if (params == NULL)
 459         return 1;
 460
 461 #if !defined(OPENSSL_NO_ACVP_TESTS)
 462     p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_KAT);
 463     if (p != NULL && !OSSL_PARAM_get_uint(p, &ctx->kattest))
 464         return 0;
 465 #endif
 466
 467     p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST);
 468     /* Not allowed during certain operations */
 469     if (p != NULL && !ctx->flag_allow_md)
 470         return 0;
 471     if (p != NULL) {
 472         char mdname[OSSL_MAX_NAME_SIZE] = "", *pmdname = mdname;
 473         char mdprops[OSSL_MAX_PROPQUERY_SIZE] = "", *pmdprops = mdprops;
 474         const OSSL_PARAM *propsp =
 475             OSSL_PARAM_locate_const(params,
 476                                     OSSL_SIGNATURE_PARAM_PROPERTIES);
 477
 478         if (!OSSL_PARAM_get_utf8_string(p, &pmdname, sizeof(mdname)))
 479             return 0;
 480         if (propsp != NULL
 481             && !OSSL_PARAM_get_utf8_string(propsp, &pmdprops, sizeof(mdprops)))
 482             return 0;
 483         if (!ecdsa_setup_md(ctx, mdname, mdprops))
 484             return 0;
 485     }
 486
 487     p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST_SIZE);
 488     if (p != NULL
 489         && (!ctx->flag_allow_md
 490             || !OSSL_PARAM_get_size_t(p, &ctx->mdsize)))
 491         return 0;
 492
 493     return 1;
 494 }
 495
 496 static const OSSL_PARAM settable_ctx_params[] = {
 497     OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
 498     OSSL_PARAM_size_t(OSSL_SIGNATURE_PARAM_DIGEST_SIZE, NULL),
 499     OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PROPERTIES, NULL, 0),
 500     OSSL_PARAM_uint(OSSL_SIGNATURE_PARAM_KAT, NULL),
 501     OSSL_PARAM_END
 502 };
 503
 504 static const OSSL_PARAM settable_ctx_params_no_digest[] = {
 505     OSSL_PARAM_uint(OSSL_SIGNATURE_PARAM_KAT, NULL),
 506     OSSL_PARAM_END
 507 };
 508
 509 static const OSSL_PARAM *ecdsa_settable_ctx_params(void *vctx,
 510                                                    ossl_unused void *provctx)
 511 {
 512     PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
 513
 514     if (ctx != NULL && !ctx->flag_allow_md)
 515         return settable_ctx_params_no_digest;
 516     return settable_ctx_params;
 517 }
 518
 519 static int ecdsa_get_ctx_md_params(void *vctx, OSSL_PARAM *params)
 520 {
 521     PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
 522
 523     if (ctx->mdctx == NULL)
 524         return 0;
 525
 526     return EVP_MD_CTX_get_params(ctx->mdctx, params);
 527 }
 528
 529 static const OSSL_PARAM *ecdsa_gettable_ctx_md_params(void *vctx)
 530 {
 531     PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
 532
 533     if (ctx->md == NULL)
 534         return 0;
 535
 536     return EVP_MD_gettable_ctx_params(ctx->md);
 537 }
 538
 539 static int ecdsa_set_ctx_md_params(void *vctx, const OSSL_PARAM params[])
 540 {
 541     PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
 542
 543     if (ctx->mdctx == NULL)
 544         return 0;
 545
 546     return EVP_MD_CTX_set_params(ctx->mdctx, params);
 547 }
 548
 549 static const OSSL_PARAM *ecdsa_settable_ctx_md_params(void *vctx)
 550 {
 551     PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
 552
 553     if (ctx->md == NULL)
 554         return 0;
 555
 556     return EVP_MD_settable_ctx_params(ctx->md);
 557 }
 558
 559 const OSSL_DISPATCH ossl_ecdsa_signature_functions[] = {
 560     { OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))ecdsa_newctx },
 561     { OSSL_FUNC_SIGNATURE_SIGN_INIT, (void (*)(void))ecdsa_sign_init },
 562     { OSSL_FUNC_SIGNATURE_SIGN, (void (*)(void))ecdsa_sign },
 563     { OSSL_FUNC_SIGNATURE_VERIFY_INIT, (void (*)(void))ecdsa_verify_init },
 564     { OSSL_FUNC_SIGNATURE_VERIFY, (void (*)(void))ecdsa_verify },
 565     { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,
 566       (void (*)(void))ecdsa_digest_sign_init },
 567     { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_UPDATE,
 568       (void (*)(void))ecdsa_digest_signverify_update },
 569     { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_FINAL,
 570       (void (*)(void))ecdsa_digest_sign_final },
 571     { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT,
 572       (void (*)(void))ecdsa_digest_verify_init },
 573     { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_UPDATE,
 574       (void (*)(void))ecdsa_digest_signverify_update },
 575     { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_FINAL,
 576       (void (*)(void))ecdsa_digest_verify_final },
 577     { OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))ecdsa_freectx },
 578     { OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))ecdsa_dupctx },
 579     { OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS, (void (*)(void))ecdsa_get_ctx_params },
 580     { OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS,
 581       (void (*)(void))ecdsa_gettable_ctx_params },
 582     { OSSL_FUNC_SIGNATURE_SET_CTX_PARAMS, (void (*)(void))ecdsa_set_ctx_params },
 583     { OSSL_FUNC_SIGNATURE_SETTABLE_CTX_PARAMS,
 584       (void (*)(void))ecdsa_settable_ctx_params },
 585     { OSSL_FUNC_SIGNATURE_GET_CTX_MD_PARAMS,
 586       (void (*)(void))ecdsa_get_ctx_md_params },
 587     { OSSL_FUNC_SIGNATURE_GETTABLE_CTX_MD_PARAMS,
 588       (void (*)(void))ecdsa_gettable_ctx_md_params },
 589     { OSSL_FUNC_SIGNATURE_SET_CTX_MD_PARAMS,
 590       (void (*)(void))ecdsa_set_ctx_md_params },
 591     { OSSL_FUNC_SIGNATURE_SETTABLE_CTX_MD_PARAMS,
 592       (void (*)(void))ecdsa_settable_ctx_md_params },
 593     { 0, NULL }
 594 };