providers/implementations/signature/dsa.c

   1 /*
   2  * Copyright 2019-2020 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 /*
  11  * DSA 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>
  17
  18 #include <openssl/crypto.h>
  19 #include <openssl/core_dispatch.h>
  20 #include <openssl/core_names.h>
  21 #include <openssl/err.h>
  22 #include <openssl/dsa.h>
  23 #include <openssl/params.h>
  24 #include <openssl/evp.h>
  25 #include <openssl/err.h>
  26 #include "internal/nelem.h"
  27 #include "internal/sizes.h"
  28 #include "internal/cryptlib.h"
  29 #include "prov/providercommon.h"
  30 #include "prov/implementations.h"
  31 #include "prov/providercommonerr.h"
  32 #include "prov/provider_ctx.h"
  33 #include "prov/provider_util.h"
  34 #include "crypto/dsa.h"
  35 #include "prov/der_dsa.h"
  36
  37 static OSSL_FUNC_signature_newctx_fn dsa_newctx;
  38 static OSSL_FUNC_signature_sign_init_fn dsa_sign_init;
  39 static OSSL_FUNC_signature_verify_init_fn dsa_verify_init;
  40 static OSSL_FUNC_signature_sign_fn dsa_sign;
  41 static OSSL_FUNC_signature_verify_fn dsa_verify;
  42 static OSSL_FUNC_signature_digest_sign_init_fn dsa_digest_sign_init;
  43 static OSSL_FUNC_signature_digest_sign_update_fn dsa_digest_signverify_update;
  44 static OSSL_FUNC_signature_digest_sign_final_fn dsa_digest_sign_final;
  45 static OSSL_FUNC_signature_digest_verify_init_fn dsa_digest_verify_init;
  46 static OSSL_FUNC_signature_digest_verify_update_fn dsa_digest_signverify_update;
  47 static OSSL_FUNC_signature_digest_verify_final_fn dsa_digest_verify_final;
  48 static OSSL_FUNC_signature_freectx_fn dsa_freectx;
  49 static OSSL_FUNC_signature_dupctx_fn dsa_dupctx;
  50 static OSSL_FUNC_signature_get_ctx_params_fn dsa_get_ctx_params;
  51 static OSSL_FUNC_signature_gettable_ctx_params_fn dsa_gettable_ctx_params;
  52 static OSSL_FUNC_signature_set_ctx_params_fn dsa_set_ctx_params;
  53 static OSSL_FUNC_signature_settable_ctx_params_fn dsa_settable_ctx_params;
  54 static OSSL_FUNC_signature_get_ctx_md_params_fn dsa_get_ctx_md_params;
  55 static OSSL_FUNC_signature_gettable_ctx_md_params_fn dsa_gettable_ctx_md_params;
  56 static OSSL_FUNC_signature_set_ctx_md_params_fn dsa_set_ctx_md_params;
  57 static OSSL_FUNC_signature_settable_ctx_md_params_fn dsa_settable_ctx_md_params;
  58
  59 /*
  60  * What's passed as an actual key is defined by the KEYMGMT interface.
  61  * We happen to know that our KEYMGMT simply passes DSA structures, so
  62  * we use that here too.
  63  */
  64
  65 typedef struct {
  66     OPENSSL_CTX *libctx;
  67     char *propq;
  68     DSA *dsa;
  69
  70     /*
  71      * Flag to determine if the hash function can be changed (1) or not (0)
  72      * Because it's dangerous to change during a DigestSign or DigestVerify
  73      * operation, this flag is cleared by their Init function, and set again
  74      * by their Final function.
  75      */
  76     unsigned int flag_allow_md : 1;
  77
  78     char mdname[OSSL_MAX_NAME_SIZE];
  79
  80     /* The Algorithm Identifier of the combined signature algorithm */
  81     unsigned char aid_buf[OSSL_MAX_ALGORITHM_ID_SIZE];
  82     unsigned char *aid;
  83     size_t  aid_len;
  84
  85     /* main digest */
  86     EVP_MD *md;
  87     EVP_MD_CTX *mdctx;
  88     size_t mdsize;
  89     int operation;
  90
  91 } PROV_DSA_CTX;
  92
  93 /*
  94  * Check for valid key sizes if fips mode. Refer to
  95  * https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-131Ar2.pdf
  96  * "Table 2"
  97  */
  98 static int dsa_check_key_size(const PROV_DSA_CTX *ctx)
  99 {
 100 #ifdef FIPS_MODULE
 101     size_t L, N;
 102     const BIGNUM *p, *q;
 103     DSA *dsa = ctx->dsa;
 104
 105     if (dsa == NULL)
 106         return 0;
 107
 108     p = DSA_get0_p(dsa);
 109     q = DSA_get0_q(dsa);
 110     if (p == NULL || q == NULL)
 111         return 0;
 112
 113     L = BN_num_bits(p);
 114     N = BN_num_bits(q);
 115
 116     /*
 117      * Valid sizes or verification - Note this could be a fips186-2 type
 118      * key - so we allow 512 also. When this is no longer suppported the
 119      * lower bound should be increased to 1024.
 120      */
 121     if (ctx->operation != EVP_PKEY_OP_SIGN)
 122         return (L >= 512 && N >= 160);
 123
 124      /* Valid sizes for both sign and verify */
 125     if (L == 2048 && (N == 224 || N == 256))
 126         return 1;
 127     return (L == 3072 && N == 256);
 128 #else
 129     return 1;
 130 #endif
 131 }
 132
 133 static size_t dsa_get_md_size(const PROV_DSA_CTX *pdsactx)
 134 {
 135     if (pdsactx->md != NULL)
 136         return EVP_MD_size(pdsactx->md);
 137     return 0;
 138 }
 139
 140 static int dsa_get_md_nid(const PROV_DSA_CTX *ctx, const EVP_MD *md)
 141 {
 142     int sha1_allowed = (ctx->operation != EVP_PKEY_OP_SIGN);
 143
 144     return ossl_prov_digest_get_approved_nid(md, sha1_allowed);
 145 }
 146
 147 static void *dsa_newctx(void *provctx, const char *propq)
 148 {
 149     PROV_DSA_CTX *pdsactx;
 150
 151     if (!ossl_prov_is_running())
 152         return NULL;
 153
 154     pdsactx = OPENSSL_zalloc(sizeof(PROV_DSA_CTX));
 155     if (pdsactx == NULL)
 156         return NULL;
 157
 158     pdsactx->libctx = PROV_LIBRARY_CONTEXT_OF(provctx);
 159     pdsactx->flag_allow_md = 1;
 160     if (propq != NULL && (pdsactx->propq = OPENSSL_strdup(propq)) == NULL) {
 161         OPENSSL_free(pdsactx);
 162         pdsactx = NULL;
 163         ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
 164     }
 165     return pdsactx;
 166 }
 167
 168 static int dsa_setup_md(PROV_DSA_CTX *ctx,
 169                         const char *mdname, const char *mdprops)
 170 {
 171     if (mdprops == NULL)
 172         mdprops = ctx->propq;
 173
 174     if (mdname != NULL) {
 175         WPACKET pkt;
 176         EVP_MD *md = EVP_MD_fetch(ctx->libctx, mdname, mdprops);
 177         int md_nid = dsa_get_md_nid(ctx, md);
 178         size_t mdname_len = strlen(mdname);
 179
 180         if (md == NULL || md_nid == NID_undef) {
 181             if (md == NULL)
 182                 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
 183                                "%s could not be fetched", mdname);
 184             if (md_nid == NID_undef)
 185                 ERR_raise_data(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED,
 186                                "digest=%s", mdname);
 187             if (mdname_len >= sizeof(ctx->mdname))
 188                 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
 189                                "%s exceeds name buffer length", mdname);
 190             EVP_MD_free(md);
 191             return 0;
 192         }
 193
 194         EVP_MD_CTX_free(ctx->mdctx);
 195         EVP_MD_free(ctx->md);
 196
 197         /*
 198          * TODO(3.0) Should we care about DER writing errors?
 199          * All it really means is that for some reason, there's no
 200          * AlgorithmIdentifier to be had, but the operation itself is
 201          * still valid, just as long as it's not used to construct
 202          * anything that needs an AlgorithmIdentifier.
 203          */
 204         ctx->aid_len = 0;
 205         if (WPACKET_init_der(&pkt, ctx->aid_buf, sizeof(ctx->aid_buf))
 206             && DER_w_algorithmIdentifier_DSA_with_MD(&pkt, -1, ctx->dsa,
 207                                                      md_nid)
 208             && WPACKET_finish(&pkt)) {
 209             WPACKET_get_total_written(&pkt, &ctx->aid_len);
 210             ctx->aid = WPACKET_get_curr(&pkt);
 211         }
 212         WPACKET_cleanup(&pkt);
 213
 214         ctx->mdctx = NULL;
 215         ctx->md = md;
 216         OPENSSL_strlcpy(ctx->mdname, mdname, sizeof(ctx->mdname));
 217     }
 218     return 1;
 219 }
 220
 221 static int dsa_signverify_init(void *vpdsactx, void *vdsa, int operation)
 222 {
 223     PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
 224
 225     if (!ossl_prov_is_running()
 226             || pdsactx == NULL
 227             || vdsa == NULL
 228             || !DSA_up_ref(vdsa))
 229         return 0;
 230     DSA_free(pdsactx->dsa);
 231     pdsactx->dsa = vdsa;
 232     pdsactx->operation = operation;
 233     if (!dsa_check_key_size(pdsactx)) {
 234         ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
 235         return 0;
 236     }
 237     return 1;
 238 }
 239
 240 static int dsa_sign_init(void *vpdsactx, void *vdsa)
 241 {
 242     return dsa_signverify_init(vpdsactx, vdsa, EVP_PKEY_OP_SIGN);
 243 }
 244
 245 static int dsa_verify_init(void *vpdsactx, void *vdsa)
 246 {
 247     return dsa_signverify_init(vpdsactx, vdsa, EVP_PKEY_OP_VERIFY);
 248 }
 249
 250 static int dsa_sign(void *vpdsactx, unsigned char *sig, size_t *siglen,
 251                     size_t sigsize, const unsigned char *tbs, size_t tbslen)
 252 {
 253     PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
 254     int ret;
 255     unsigned int sltmp;
 256     size_t dsasize = DSA_size(pdsactx->dsa);
 257     size_t mdsize = dsa_get_md_size(pdsactx);
 258
 259     if (!ossl_prov_is_running())
 260         return 0;
 261
 262     if (sig == NULL) {
 263         *siglen = dsasize;
 264         return 1;
 265     }
 266
 267     if (sigsize < (size_t)dsasize)
 268         return 0;
 269
 270     if (mdsize != 0 && tbslen != mdsize)
 271         return 0;
 272
 273     ret = dsa_sign_int(0, tbs, tbslen, sig, &sltmp, pdsactx->dsa);
 274     if (ret <= 0)
 275         return 0;
 276
 277     *siglen = sltmp;
 278     return 1;
 279 }
 280
 281 static int dsa_verify(void *vpdsactx, const unsigned char *sig, size_t siglen,
 282                       const unsigned char *tbs, size_t tbslen)
 283 {
 284     PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
 285     size_t mdsize = dsa_get_md_size(pdsactx);
 286
 287     if (!ossl_prov_is_running() || (mdsize != 0 && tbslen != mdsize))
 288         return 0;
 289
 290     return DSA_verify(0, tbs, tbslen, sig, siglen, pdsactx->dsa);
 291 }
 292
 293 static int dsa_digest_signverify_init(void *vpdsactx, const char *mdname,
 294                                       void *vdsa, int operation)
 295 {
 296     PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
 297
 298     if (!ossl_prov_is_running())
 299         return 0;
 300
 301     pdsactx->flag_allow_md = 0;
 302     if (!dsa_signverify_init(vpdsactx, vdsa, operation))
 303         return 0;
 304
 305     if (!dsa_setup_md(pdsactx, mdname, NULL))
 306         return 0;
 307
 308     pdsactx->mdctx = EVP_MD_CTX_new();
 309     if (pdsactx->mdctx == NULL)
 310         goto error;
 311
 312     if (!EVP_DigestInit_ex(pdsactx->mdctx, pdsactx->md, NULL))
 313         goto error;
 314
 315     return 1;
 316
 317  error:
 318     EVP_MD_CTX_free(pdsactx->mdctx);
 319     EVP_MD_free(pdsactx->md);
 320     pdsactx->mdctx = NULL;
 321     pdsactx->md = NULL;
 322     return 0;
 323 }
 324
 325 static int dsa_digest_sign_init(void *vpdsactx, const char *mdname,
 326                                       void *vdsa)
 327 {
 328     return dsa_digest_signverify_init(vpdsactx, mdname, vdsa, EVP_PKEY_OP_SIGN);
 329 }
 330
 331 static int dsa_digest_verify_init(void *vpdsactx, const char *mdname, void *vdsa)
 332 {
 333     return dsa_digest_signverify_init(vpdsactx, mdname, vdsa, EVP_PKEY_OP_VERIFY);
 334 }
 335
 336 int dsa_digest_signverify_update(void *vpdsactx, const unsigned char *data,
 337                                  size_t datalen)
 338 {
 339     PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
 340
 341     if (pdsactx == NULL || pdsactx->mdctx == NULL)
 342         return 0;
 343
 344     return EVP_DigestUpdate(pdsactx->mdctx, data, datalen);
 345 }
 346
 347 int dsa_digest_sign_final(void *vpdsactx, unsigned char *sig, size_t *siglen,
 348                           size_t sigsize)
 349 {
 350     PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
 351     unsigned char digest[EVP_MAX_MD_SIZE];
 352     unsigned int dlen = 0;
 353
 354     if (!ossl_prov_is_running() || pdsactx == NULL || pdsactx->mdctx == NULL)
 355         return 0;
 356
 357     /*
 358      * If sig is NULL then we're just finding out the sig size. Other fields
 359      * are ignored. Defer to dsa_sign.
 360      */
 361     if (sig != NULL) {
 362         /*
 363          * TODO(3.0): There is the possibility that some externally provided
 364          * digests exceed EVP_MAX_MD_SIZE. We should probably handle that somehow -
 365          * but that problem is much larger than just in DSA.
 366          */
 367         if (!EVP_DigestFinal_ex(pdsactx->mdctx, digest, &dlen))
 368             return 0;
 369     }
 370
 371     pdsactx->flag_allow_md = 1;
 372
 373     return dsa_sign(vpdsactx, sig, siglen, sigsize, digest, (size_t)dlen);
 374 }
 375
 376
 377 int dsa_digest_verify_final(void *vpdsactx, const unsigned char *sig,
 378                             size_t siglen)
 379 {
 380     PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
 381     unsigned char digest[EVP_MAX_MD_SIZE];
 382     unsigned int dlen = 0;
 383
 384     if (!ossl_prov_is_running() || pdsactx == NULL || pdsactx->mdctx == NULL)
 385         return 0;
 386
 387     /*
 388      * TODO(3.0): There is the possibility that some externally provided
 389      * digests exceed EVP_MAX_MD_SIZE. We should probably handle that somehow -
 390      * but that problem is much larger than just in DSA.
 391      */
 392     if (!EVP_DigestFinal_ex(pdsactx->mdctx, digest, &dlen))
 393         return 0;
 394
 395     pdsactx->flag_allow_md = 1;
 396
 397     return dsa_verify(vpdsactx, sig, siglen, digest, (size_t)dlen);
 398 }
 399
 400 static void dsa_freectx(void *vpdsactx)
 401 {
 402     PROV_DSA_CTX *ctx = (PROV_DSA_CTX *)vpdsactx;
 403
 404     OPENSSL_free(ctx->propq);
 405     EVP_MD_CTX_free(ctx->mdctx);
 406     EVP_MD_free(ctx->md);
 407     ctx->propq = NULL;
 408     ctx->mdctx = NULL;
 409     ctx->md = NULL;
 410     ctx->mdsize = 0;
 411     DSA_free(ctx->dsa);
 412     OPENSSL_free(ctx);
 413 }
 414
 415 static void *dsa_dupctx(void *vpdsactx)
 416 {
 417     PROV_DSA_CTX *srcctx = (PROV_DSA_CTX *)vpdsactx;
 418     PROV_DSA_CTX *dstctx;
 419
 420     if (!ossl_prov_is_running())
 421         return NULL;
 422
 423     dstctx = OPENSSL_zalloc(sizeof(*srcctx));
 424     if (dstctx == NULL)
 425         return NULL;
 426
 427     *dstctx = *srcctx;
 428     dstctx->dsa = NULL;
 429     dstctx->md = NULL;
 430     dstctx->mdctx = NULL;
 431
 432     if (srcctx->dsa != NULL && !DSA_up_ref(srcctx->dsa))
 433         goto err;
 434     dstctx->dsa = srcctx->dsa;
 435
 436     if (srcctx->md != NULL && !EVP_MD_up_ref(srcctx->md))
 437         goto err;
 438     dstctx->md = srcctx->md;
 439
 440     if (srcctx->mdctx != NULL) {
 441         dstctx->mdctx = EVP_MD_CTX_new();
 442         if (dstctx->mdctx == NULL
 443                 || !EVP_MD_CTX_copy_ex(dstctx->mdctx, srcctx->mdctx))
 444             goto err;
 445     }
 446
 447     return dstctx;
 448  err:
 449     dsa_freectx(dstctx);
 450     return NULL;
 451 }
 452
 453 static int dsa_get_ctx_params(void *vpdsactx, OSSL_PARAM *params)
 454 {
 455     PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
 456     OSSL_PARAM *p;
 457
 458     if (pdsactx == NULL || params == NULL)
 459         return 0;
 460
 461     p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_ALGORITHM_ID);
 462     if (p != NULL
 463         && !OSSL_PARAM_set_octet_string(p, pdsactx->aid, pdsactx->aid_len))
 464         return 0;
 465
 466     p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST);
 467     if (p != NULL && !OSSL_PARAM_set_utf8_string(p, pdsactx->mdname))
 468         return 0;
 469
 470     return 1;
 471 }
 472
 473 static const OSSL_PARAM known_gettable_ctx_params[] = {
 474     OSSL_PARAM_octet_string(OSSL_SIGNATURE_PARAM_ALGORITHM_ID, NULL, 0),
 475     OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
 476     OSSL_PARAM_END
 477 };
 478
 479 static const OSSL_PARAM *dsa_gettable_ctx_params(ossl_unused void *vctx)
 480 {
 481     return known_gettable_ctx_params;
 482 }
 483
 484 static int dsa_set_ctx_params(void *vpdsactx, const OSSL_PARAM params[])
 485 {
 486     PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
 487     const OSSL_PARAM *p;
 488
 489     if (pdsactx == NULL || params == NULL)
 490         return 0;
 491
 492     p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST);
 493     /* Not allowed during certain operations */
 494     if (p != NULL && !pdsactx->flag_allow_md)
 495         return 0;
 496     if (p != NULL) {
 497         char mdname[OSSL_MAX_NAME_SIZE] = "", *pmdname = mdname;
 498         char mdprops[OSSL_MAX_PROPQUERY_SIZE] = "", *pmdprops = mdprops;
 499         const OSSL_PARAM *propsp =
 500             OSSL_PARAM_locate_const(params,
 501                                     OSSL_SIGNATURE_PARAM_PROPERTIES);
 502
 503         if (!OSSL_PARAM_get_utf8_string(p, &pmdname, sizeof(mdname)))
 504             return 0;
 505         if (propsp != NULL
 506             && !OSSL_PARAM_get_utf8_string(propsp, &pmdprops, sizeof(mdprops)))
 507             return 0;
 508         if (!dsa_setup_md(pdsactx, mdname, mdprops))
 509             return 0;
 510     }
 511
 512     return 1;
 513 }
 514
 515 static const OSSL_PARAM known_settable_ctx_params[] = {
 516     OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
 517     OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PROPERTIES, NULL, 0),
 518     OSSL_PARAM_END
 519 };
 520
 521 static const OSSL_PARAM *dsa_settable_ctx_params(ossl_unused void *provctx)
 522 {
 523     /*
 524      * TODO(3.0): Should this function return a different set of settable ctx
 525      * params if the ctx is being used for a DigestSign/DigestVerify? In that
 526      * case it is not allowed to set the digest size/digest name because the
 527      * digest is explicitly set as part of the init.
 528      * NOTE: Ideally we would check pdsactx->flag_allow_md, but this is
 529      * problematic because there is no nice way of passing the
 530      * PROV_DSA_CTX down to this function...
 531      * Because we have API's that dont know about their parent..
 532      * e.g: EVP_SIGNATURE_gettable_ctx_params(const EVP_SIGNATURE *sig).
 533      * We could pass NULL for that case (but then how useful is the check?).
 534      */
 535     return known_settable_ctx_params;
 536 }
 537
 538 static int dsa_get_ctx_md_params(void *vpdsactx, OSSL_PARAM *params)
 539 {
 540     PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
 541
 542     if (pdsactx->mdctx == NULL)
 543         return 0;
 544
 545     return EVP_MD_CTX_get_params(pdsactx->mdctx, params);
 546 }
 547
 548 static const OSSL_PARAM *dsa_gettable_ctx_md_params(void *vpdsactx)
 549 {
 550     PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
 551
 552     if (pdsactx->md == NULL)
 553         return 0;
 554
 555     return EVP_MD_gettable_ctx_params(pdsactx->md);
 556 }
 557
 558 static int dsa_set_ctx_md_params(void *vpdsactx, const OSSL_PARAM params[])
 559 {
 560     PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
 561
 562     if (pdsactx->mdctx == NULL)
 563         return 0;
 564
 565     return EVP_MD_CTX_set_params(pdsactx->mdctx, params);
 566 }
 567
 568 static const OSSL_PARAM *dsa_settable_ctx_md_params(void *vpdsactx)
 569 {
 570     PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
 571
 572     if (pdsactx->md == NULL)
 573         return 0;
 574
 575     return EVP_MD_settable_ctx_params(pdsactx->md);
 576 }
 577
 578 const OSSL_DISPATCH dsa_signature_functions[] = {
 579     { OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))dsa_newctx },
 580     { OSSL_FUNC_SIGNATURE_SIGN_INIT, (void (*)(void))dsa_sign_init },
 581     { OSSL_FUNC_SIGNATURE_SIGN, (void (*)(void))dsa_sign },
 582     { OSSL_FUNC_SIGNATURE_VERIFY_INIT, (void (*)(void))dsa_verify_init },
 583     { OSSL_FUNC_SIGNATURE_VERIFY, (void (*)(void))dsa_verify },
 584     { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,
 585       (void (*)(void))dsa_digest_sign_init },
 586     { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_UPDATE,
 587       (void (*)(void))dsa_digest_signverify_update },
 588     { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_FINAL,
 589       (void (*)(void))dsa_digest_sign_final },
 590     { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT,
 591       (void (*)(void))dsa_digest_verify_init },
 592     { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_UPDATE,
 593       (void (*)(void))dsa_digest_signverify_update },
 594     { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_FINAL,
 595       (void (*)(void))dsa_digest_verify_final },
 596     { OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))dsa_freectx },
 597     { OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))dsa_dupctx },
 598     { OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS, (void (*)(void))dsa_get_ctx_params },
 599     { OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS,
 600       (void (*)(void))dsa_gettable_ctx_params },
 601     { OSSL_FUNC_SIGNATURE_SET_CTX_PARAMS, (void (*)(void))dsa_set_ctx_params },
 602     { OSSL_FUNC_SIGNATURE_SETTABLE_CTX_PARAMS,
 603       (void (*)(void))dsa_settable_ctx_params },
 604     { OSSL_FUNC_SIGNATURE_GET_CTX_MD_PARAMS,
 605       (void (*)(void))dsa_get_ctx_md_params },
 606     { OSSL_FUNC_SIGNATURE_GETTABLE_CTX_MD_PARAMS,
 607       (void (*)(void))dsa_gettable_ctx_md_params },
 608     { OSSL_FUNC_SIGNATURE_SET_CTX_MD_PARAMS,
 609       (void (*)(void))dsa_set_ctx_md_params },
 610     { OSSL_FUNC_SIGNATURE_SETTABLE_CTX_MD_PARAMS,
 611       (void (*)(void))dsa_settable_ctx_md_params },
 612     { 0, NULL }
 613 };