providers/implementations/keymgmt/dsa_kmgmt.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 "e_os.h" /* strcasecmp */
  17 #include <openssl/core_numbers.h>
  18 #include <openssl/core_names.h>
  19 #include <openssl/bn.h>
  20 #include <openssl/err.h>
  21 #include "prov/providercommon.h"
  22 #include "prov/implementations.h"
  23 #include "prov/provider_ctx.h"
  24 #include "crypto/dsa.h"
  25 #include "internal/sizes.h"
  26 #include "internal/nelem.h"
  27 #include "internal/param_build_set.h"
  28
  29 static OSSL_OP_keymgmt_new_fn dsa_newdata;
  30 static OSSL_OP_keymgmt_free_fn dsa_freedata;
  31 static OSSL_OP_keymgmt_gen_init_fn dsa_gen_init;
  32 static OSSL_OP_keymgmt_gen_set_template_fn dsa_gen_set_template;
  33 static OSSL_OP_keymgmt_gen_set_params_fn dsa_gen_set_params;
  34 static OSSL_OP_keymgmt_gen_settable_params_fn dsa_gen_settable_params;
  35 static OSSL_OP_keymgmt_gen_fn dsa_gen;
  36 static OSSL_OP_keymgmt_gen_cleanup_fn dsa_gen_cleanup;
  37 static OSSL_OP_keymgmt_get_params_fn dsa_get_params;
  38 static OSSL_OP_keymgmt_gettable_params_fn dsa_gettable_params;
  39 static OSSL_OP_keymgmt_has_fn dsa_has;
  40 static OSSL_OP_keymgmt_match_fn dsa_match;
  41 static OSSL_OP_keymgmt_validate_fn dsa_validate;
  42 static OSSL_OP_keymgmt_import_fn dsa_import;
  43 static OSSL_OP_keymgmt_import_types_fn dsa_import_types;
  44 static OSSL_OP_keymgmt_export_fn dsa_export;
  45 static OSSL_OP_keymgmt_export_types_fn dsa_export_types;
  46
  47 #define DSA_DEFAULT_MD "SHA256"
  48 #define DSA_POSSIBLE_SELECTIONS                                                \
  49     (OSSL_KEYMGMT_SELECT_KEYPAIR | OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS)
  50
  51 struct dsa_gen_ctx {
  52     OPENSSL_CTX *libctx;
  53
  54     FFC_PARAMS *ffc_params;
  55     int selection;
  56     /* All these parameters are used for parameter generation only */
  57     size_t pbits;
  58     size_t qbits;
  59     EVP_MD *md;
  60     unsigned char *seed; /* optional FIPS186-4 param for testing */
  61     size_t seedlen;
  62     int gindex; /* optional  FIPS186-4 generator index (ignored if -1) */
  63     int gen_type; /* DSA_PARAMGEN_TYPE_FIPS_186_2 or DSA_PARAMGEN_TYPE_FIPS_186_4 */
  64     int pcounter;
  65     int hindex;
  66     OSSL_CALLBACK *cb;
  67     void *cbarg;
  68 };
  69 typedef struct dh_name2id_st{
  70     const char *name;
  71     int id;
  72 } DSA_GENTYPE_NAME2ID;
  73
  74 static const DSA_GENTYPE_NAME2ID dsatype2id[]=
  75 {
  76     { "default", DSA_PARAMGEN_TYPE_FIPS_186_4 },
  77     { "fips186_4", DSA_PARAMGEN_TYPE_FIPS_186_4 },
  78     { "fips186_2", DSA_PARAMGEN_TYPE_FIPS_186_2 },
  79 };
  80
  81 static int dsa_gen_type_name2id(const char *name)
  82 {
  83     size_t i;
  84
  85     for (i = 0; i < OSSL_NELEM(dsatype2id); ++i) {
  86         if (strcasecmp(dsatype2id[i].name, name) == 0)
  87             return dsatype2id[i].id;
  88     }
  89     return -1;
  90 }
  91
  92 static int dsa_key_todata(DSA *dsa, OSSL_PARAM_BLD *bld, OSSL_PARAM params[])
  93 {
  94     const BIGNUM *priv = NULL, *pub = NULL;
  95
  96     if (dsa == NULL)
  97         return 0;
  98
  99     DSA_get0_key(dsa, &pub, &priv);
 100     if (priv != NULL
 101         && !ossl_param_build_set_bn(bld, params, OSSL_PKEY_PARAM_PRIV_KEY, priv))
 102         return 0;
 103     if (pub != NULL
 104         && !ossl_param_build_set_bn(bld, params, OSSL_PKEY_PARAM_PUB_KEY, pub))
 105         return 0;
 106
 107     return 1;
 108 }
 109
 110 static void *dsa_newdata(void *provctx)
 111 {
 112     return dsa_new_with_ctx(PROV_LIBRARY_CONTEXT_OF(provctx));
 113 }
 114
 115 static void dsa_freedata(void *keydata)
 116 {
 117     DSA_free(keydata);
 118 }
 119
 120 static int dsa_has(void *keydata, int selection)
 121 {
 122     DSA *dsa = keydata;
 123     int ok = 0;
 124
 125     if (dsa != NULL) {
 126         if ((selection & DSA_POSSIBLE_SELECTIONS) != 0)
 127             ok = 1;
 128
 129         if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
 130             ok = ok && (DSA_get0_pub_key(dsa) != NULL);
 131         if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 132             ok = ok && (DSA_get0_priv_key(dsa) != NULL);
 133         if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
 134             ok = ok && (DSA_get0_p(dsa) != NULL && DSA_get0_g(dsa) != NULL);
 135     }
 136     return ok;
 137 }
 138
 139 static int dsa_match(const void *keydata1, const void *keydata2, int selection)
 140 {
 141     const DSA *dsa1 = keydata1;
 142     const DSA *dsa2 = keydata2;
 143     int ok = 1;
 144
 145     if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
 146         ok = ok
 147             && BN_cmp(DSA_get0_pub_key(dsa1), DSA_get0_pub_key(dsa2)) == 0;
 148     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 149         ok = ok
 150             && BN_cmp(DSA_get0_priv_key(dsa1), DSA_get0_priv_key(dsa2)) == 0;
 151     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0) {
 152         FFC_PARAMS *dsaparams1 = dsa_get0_params((DSA *)dsa1);
 153         FFC_PARAMS *dsaparams2 = dsa_get0_params((DSA *)dsa2);
 154
 155         ok = ok && ffc_params_cmp(dsaparams1, dsaparams2, 1);
 156     }
 157     return ok;
 158 }
 159
 160 static int dsa_import(void *keydata, int selection, const OSSL_PARAM params[])
 161 {
 162     DSA *dsa = keydata;
 163     int ok = 1;
 164
 165     if (dsa == NULL)
 166         return 0;
 167
 168     if ((selection & DSA_POSSIBLE_SELECTIONS) == 0)
 169         return 0;
 170
 171     if ((selection & OSSL_KEYMGMT_SELECT_ALL_PARAMETERS) != 0)
 172         ok = ok && dsa_ffc_params_fromdata(dsa, params);
 173     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
 174         ok = ok && dsa_key_fromdata(dsa, params);
 175
 176     return ok;
 177 }
 178
 179 static int dsa_export(void *keydata, int selection, OSSL_CALLBACK *param_cb,
 180                       void *cbarg)
 181 {
 182     DSA *dsa = keydata;
 183     OSSL_PARAM_BLD *tmpl = OSSL_PARAM_BLD_new();
 184     OSSL_PARAM *params = NULL;
 185     int ok = 1;
 186
 187     if (dsa == NULL)
 188         goto err;
 189
 190     if ((selection & OSSL_KEYMGMT_SELECT_ALL_PARAMETERS) != 0)
 191         ok = ok && ffc_params_todata(dsa_get0_params(dsa), tmpl, NULL);
 192     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
 193         ok = ok && dsa_key_todata(dsa, tmpl, NULL);
 194
 195     if (!ok
 196         || (params = OSSL_PARAM_BLD_to_param(tmpl)) == NULL)
 197         goto err;;
 198
 199     ok = param_cb(params, cbarg);
 200     OSSL_PARAM_BLD_free_params(params);
 201 err:
 202     OSSL_PARAM_BLD_free(tmpl);
 203     return ok;
 204 }
 205
 206 /* IMEXPORT = IMPORT + EXPORT */
 207
 208 # define DSA_IMEXPORTABLE_PARAMETERS                                           \
 209     OSSL_PARAM_BN(OSSL_PKEY_PARAM_FFC_P, NULL, 0),                             \
 210     OSSL_PARAM_BN(OSSL_PKEY_PARAM_FFC_Q, NULL, 0),                             \
 211     OSSL_PARAM_BN(OSSL_PKEY_PARAM_FFC_G, NULL, 0),                             \
 212     OSSL_PARAM_BN(OSSL_PKEY_PARAM_FFC_COFACTOR, NULL, 0),                      \
 213     OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_GINDEX, NULL),                          \
 214     OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_PCOUNTER, NULL),                        \
 215     OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_H, NULL),                               \
 216     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_FFC_GROUP, NULL, 0),                \
 217     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_FFC_SEED, NULL, 0)
 218 # define DSA_IMEXPORTABLE_PUBLIC_KEY                    \
 219     OSSL_PARAM_BN(OSSL_PKEY_PARAM_PUB_KEY, NULL, 0)
 220 # define DSA_IMEXPORTABLE_PRIVATE_KEY                   \
 221     OSSL_PARAM_BN(OSSL_PKEY_PARAM_PRIV_KEY, NULL, 0)
 222 static const OSSL_PARAM dsa_all_types[] = {
 223     DSA_IMEXPORTABLE_PARAMETERS,
 224     DSA_IMEXPORTABLE_PUBLIC_KEY,
 225     DSA_IMEXPORTABLE_PRIVATE_KEY,
 226     OSSL_PARAM_END
 227 };
 228 static const OSSL_PARAM dsa_parameter_types[] = {
 229     DSA_IMEXPORTABLE_PARAMETERS,
 230     OSSL_PARAM_END
 231 };
 232 static const OSSL_PARAM dsa_key_types[] = {
 233     DSA_IMEXPORTABLE_PUBLIC_KEY,
 234     DSA_IMEXPORTABLE_PRIVATE_KEY,
 235     OSSL_PARAM_END
 236 };
 237 static const OSSL_PARAM *dsa_types[] = {
 238     NULL,                        /* Index 0 = none of them */
 239     dsa_parameter_types,          /* Index 1 = parameter types */
 240     dsa_key_types,                /* Index 2 = key types */
 241     dsa_all_types                 /* Index 3 = 1 + 2 */
 242 };
 243
 244 static const OSSL_PARAM *dsa_imexport_types(int selection)
 245 {
 246     int type_select = 0;
 247
 248     if ((selection & OSSL_KEYMGMT_SELECT_ALL_PARAMETERS) != 0)
 249         type_select += 1;
 250     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
 251         type_select += 2;
 252     return dsa_types[type_select];
 253 }
 254
 255 static const OSSL_PARAM *dsa_import_types(int selection)
 256 {
 257     return dsa_imexport_types(selection);
 258 }
 259
 260 static const OSSL_PARAM *dsa_export_types(int selection)
 261 {
 262     return dsa_imexport_types(selection);
 263 }
 264
 265 static ossl_inline int dsa_get_params(void *key, OSSL_PARAM params[])
 266 {
 267     DSA *dsa = key;
 268     OSSL_PARAM *p;
 269
 270     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_BITS)) != NULL
 271         && !OSSL_PARAM_set_int(p, DSA_bits(dsa)))
 272         return 0;
 273     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_SECURITY_BITS)) != NULL
 274         && !OSSL_PARAM_set_int(p, DSA_security_bits(dsa)))
 275         return 0;
 276     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_MAX_SIZE)) != NULL
 277         && !OSSL_PARAM_set_int(p, DSA_size(dsa)))
 278         return 0;
 279     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_DEFAULT_DIGEST)) != NULL
 280         && !OSSL_PARAM_set_utf8_string(p, DSA_DEFAULT_MD))
 281         return 0;
 282     return ffc_params_todata(dsa_get0_params(dsa), NULL, params)
 283            && dsa_key_todata(dsa, NULL, params);
 284 }
 285
 286 static const OSSL_PARAM dsa_params[] = {
 287     OSSL_PARAM_int(OSSL_PKEY_PARAM_BITS, NULL),
 288     OSSL_PARAM_int(OSSL_PKEY_PARAM_SECURITY_BITS, NULL),
 289     OSSL_PARAM_int(OSSL_PKEY_PARAM_MAX_SIZE, NULL),
 290     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_DEFAULT_DIGEST, NULL, 0),
 291     DSA_IMEXPORTABLE_PARAMETERS,
 292     DSA_IMEXPORTABLE_PUBLIC_KEY,
 293     DSA_IMEXPORTABLE_PRIVATE_KEY,
 294     OSSL_PARAM_END
 295 };
 296
 297 static const OSSL_PARAM *dsa_gettable_params(void)
 298 {
 299     return dsa_params;
 300 }
 301
 302 static int dsa_validate_domparams(DSA *dsa)
 303 {
 304     int status = 0;
 305
 306     return dsa_check_params(dsa, &status);
 307 }
 308
 309 static int dsa_validate_public(DSA *dsa)
 310 {
 311     int status = 0;
 312     const BIGNUM *pub_key = NULL;
 313
 314     DSA_get0_key(dsa, &pub_key, NULL);
 315     return dsa_check_pub_key(dsa, pub_key, &status);
 316 }
 317
 318 static int dsa_validate_private(DSA *dsa)
 319 {
 320     int status = 0;
 321     const BIGNUM *priv_key = NULL;
 322
 323     DSA_get0_key(dsa, NULL, &priv_key);
 324     return dsa_check_priv_key(dsa, priv_key, &status);
 325 }
 326
 327 static int dsa_validate(void *keydata, int selection)
 328 {
 329     DSA *dsa = keydata;
 330     int ok = 0;
 331
 332     if ((selection & DSA_POSSIBLE_SELECTIONS) != 0)
 333         ok = 1;
 334
 335     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
 336         ok = ok && dsa_validate_domparams(dsa);
 337
 338     if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
 339         ok = ok && dsa_validate_public(dsa);
 340
 341     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 342         ok = ok && dsa_validate_private(dsa);
 343
 344     /* If the whole key is selected, we do a pairwise validation */
 345     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR)
 346         == OSSL_KEYMGMT_SELECT_KEYPAIR)
 347         ok = ok && dsa_check_pairwise(dsa);
 348     return ok;
 349 }
 350
 351 static void *dsa_gen_init(void *provctx, int selection)
 352 {
 353     OPENSSL_CTX *libctx = PROV_LIBRARY_CONTEXT_OF(provctx);
 354     struct dsa_gen_ctx *gctx = NULL;
 355
 356     if ((selection & DSA_POSSIBLE_SELECTIONS) == 0)
 357         return NULL;
 358
 359     if ((gctx = OPENSSL_zalloc(sizeof(*gctx))) != NULL) {
 360         gctx->selection = selection;
 361         gctx->libctx = libctx;
 362         gctx->pbits = 2048;
 363         gctx->qbits = 224;
 364         gctx->md = NULL;
 365         gctx->gen_type = DSA_PARAMGEN_TYPE_FIPS_186_4;
 366         gctx->gindex = -1;
 367         gctx->pcounter = -1;
 368         gctx->hindex = 0;
 369     }
 370     return gctx;
 371 }
 372
 373 static int dsa_gen_set_template(void *genctx, void *templ)
 374 {
 375     struct dsa_gen_ctx *gctx = genctx;
 376     DSA *dsa = templ;
 377
 378     if (gctx == NULL || dsa == NULL)
 379         return 0;
 380     gctx->ffc_params = dsa_get0_params(dsa);
 381     return 1;
 382 }
 383
 384 static int dsa_set_gen_seed(struct dsa_gen_ctx *gctx, unsigned char *seed,
 385                             size_t seedlen)
 386 {
 387     OPENSSL_clear_free(gctx->seed, gctx->seedlen);
 388     gctx->seed = NULL;
 389     gctx->seedlen = 0;
 390     if (seed != NULL && seedlen > 0) {
 391         gctx->seed = OPENSSL_memdup(seed, seedlen);
 392         if (gctx->seed == NULL)
 393             return 0;
 394         gctx->seedlen = seedlen;
 395     }
 396     return 1;
 397 }
 398
 399 static int dsa_gen_set_params(void *genctx, const OSSL_PARAM params[])
 400 {
 401     struct dsa_gen_ctx *gctx = genctx;
 402     const OSSL_PARAM *p;
 403
 404     if (gctx == NULL)
 405         return 0;
 406
 407     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_TYPE);
 408     if (p != NULL) {
 409         if (p->data_type != OSSL_PARAM_UTF8_STRING
 410             || ((gctx->gen_type = dsa_gen_type_name2id(p->data)) == -1)) {
 411             ERR_raise(ERR_LIB_PROV, ERR_R_PASSED_INVALID_ARGUMENT);
 412             return 0;
 413         }
 414     }
 415     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_GINDEX);
 416     if (p != NULL
 417         && !OSSL_PARAM_get_int(p, &gctx->gindex))
 418         return 0;
 419     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_PCOUNTER);
 420     if (p != NULL
 421         && !OSSL_PARAM_get_int(p, &gctx->pcounter))
 422         return 0;
 423     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_H);
 424     if (p != NULL
 425         && !OSSL_PARAM_get_int(p, &gctx->hindex))
 426         return 0;
 427     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_SEED);
 428     if (p != NULL
 429         && (p->data_type != OSSL_PARAM_OCTET_STRING
 430             || !dsa_set_gen_seed(gctx, p->data, p->data_size)))
 431             return 0;
 432     if ((p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_PBITS)) != NULL
 433         && !OSSL_PARAM_get_size_t(p, &gctx->pbits))
 434         return 0;
 435     if ((p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_QBITS)) != NULL
 436         && !OSSL_PARAM_get_size_t(p, &gctx->qbits))
 437         return 0;
 438     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_DIGEST);
 439     if (p != NULL) {
 440         const OSSL_PARAM *p1;
 441         char mdprops[OSSL_MAX_PROPQUERY_SIZE] = { '\0' };
 442         char *str = mdprops;
 443
 444         if (p->data_type != OSSL_PARAM_UTF8_STRING)
 445             return 0;
 446         p1 = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_DIGEST_PROPS);
 447         if (p1 != NULL) {
 448             if (!OSSL_PARAM_get_utf8_string(p1, &str, sizeof(mdprops)))
 449                 return 0;
 450         }
 451         EVP_MD_free(gctx->md);
 452         gctx->md = EVP_MD_fetch(gctx->libctx, p->data, mdprops);
 453         if (gctx->md == NULL)
 454             return 0;
 455     }
 456     return 1;
 457 }
 458
 459 static const OSSL_PARAM *dsa_gen_settable_params(void *provctx)
 460 {
 461     static OSSL_PARAM settable[] = {
 462         OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_FFC_TYPE, NULL, 0),
 463         OSSL_PARAM_size_t(OSSL_PKEY_PARAM_FFC_PBITS, NULL),
 464         OSSL_PARAM_size_t(OSSL_PKEY_PARAM_FFC_QBITS, NULL),
 465         OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_FFC_DIGEST, NULL, 0),
 466         OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_FFC_DIGEST_PROPS, NULL, 0),
 467         OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_GINDEX, NULL),
 468         OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_FFC_SEED, NULL, 0),
 469         OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_PCOUNTER, NULL),
 470         OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_H, NULL),
 471         OSSL_PARAM_END
 472     };
 473     return settable;
 474 }
 475
 476 static int dsa_gencb(int p, int n, BN_GENCB *cb)
 477 {
 478     struct dsa_gen_ctx *gctx = BN_GENCB_get_arg(cb);
 479     OSSL_PARAM params[] = { OSSL_PARAM_END, OSSL_PARAM_END, OSSL_PARAM_END };
 480
 481     params[0] = OSSL_PARAM_construct_int(OSSL_GEN_PARAM_POTENTIAL, &p);
 482     params[1] = OSSL_PARAM_construct_int(OSSL_GEN_PARAM_ITERATION, &n);
 483
 484     return gctx->cb(params, gctx->cbarg);
 485 }
 486
 487 static void *dsa_gen(void *genctx, OSSL_CALLBACK *osslcb, void *cbarg)
 488 {
 489     struct dsa_gen_ctx *gctx = genctx;
 490     DSA *dsa = NULL;
 491     BN_GENCB *gencb = NULL;
 492     int ret = 0;
 493     FFC_PARAMS *ffc;
 494
 495     if (gctx == NULL)
 496         return NULL;
 497     dsa = dsa_new_with_ctx(gctx->libctx);
 498     if (dsa == NULL)
 499         return NULL;
 500
 501     gctx->cb = osslcb;
 502     gctx->cbarg = cbarg;
 503     gencb = BN_GENCB_new();
 504     if (gencb != NULL)
 505         BN_GENCB_set(gencb, dsa_gencb, genctx);
 506
 507     ffc = dsa_get0_params(dsa);
 508     /* Copy the template value if one was passed */
 509     if (gctx->ffc_params != NULL
 510         && !ffc_params_copy(ffc, gctx->ffc_params))
 511         goto end;
 512
 513     if (gctx->seed != NULL
 514         && !ffc_params_set_seed(ffc, gctx->seed, gctx->seedlen))
 515         goto end;
 516     if (gctx->gindex != -1) {
 517         ffc_params_set_gindex(ffc, gctx->gindex);
 518         if (gctx->pcounter != -1)
 519             ffc_params_set_pcounter(ffc, gctx->pcounter);
 520     } else if (gctx->hindex != 0) {
 521         ffc_params_set_h(ffc, gctx->hindex);
 522     }
 523     if ((gctx->selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0) {
 524
 525          if (dsa_generate_ffc_parameters(dsa, gctx->gen_type,
 526                                          gctx->pbits, gctx->qbits, gctx->md,
 527                                          gencb) <= 0)
 528              goto end;
 529     }
 530     if ((gctx->selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0) {
 531         if (ffc->p == NULL
 532             || ffc->q == NULL
 533             || ffc->g == NULL)
 534             goto end;
 535         if (DSA_generate_key(dsa) <= 0)
 536             goto end;
 537     }
 538     ret = 1;
 539 end:
 540     if (ret <= 0) {
 541         DSA_free(dsa);
 542         dsa = NULL;
 543     }
 544     BN_GENCB_free(gencb);
 545     return dsa;
 546 }
 547
 548 static void dsa_gen_cleanup(void *genctx)
 549 {
 550     struct dsa_gen_ctx *gctx = genctx;
 551
 552     if (gctx == NULL)
 553         return;
 554
 555     OPENSSL_clear_free(gctx->seed, gctx->seedlen);
 556     EVP_MD_free(gctx->md);
 557     OPENSSL_free(gctx);
 558 }
 559
 560 const OSSL_DISPATCH dsa_keymgmt_functions[] = {
 561     { OSSL_FUNC_KEYMGMT_NEW, (void (*)(void))dsa_newdata },
 562     { OSSL_FUNC_KEYMGMT_GEN_INIT, (void (*)(void))dsa_gen_init },
 563     { OSSL_FUNC_KEYMGMT_GEN_SET_TEMPLATE, (void (*)(void))dsa_gen_set_template },
 564     { OSSL_FUNC_KEYMGMT_GEN_SET_PARAMS, (void (*)(void))dsa_gen_set_params },
 565     { OSSL_FUNC_KEYMGMT_GEN_SETTABLE_PARAMS,
 566       (void (*)(void))dsa_gen_settable_params },
 567     { OSSL_FUNC_KEYMGMT_GEN, (void (*)(void))dsa_gen },
 568     { OSSL_FUNC_KEYMGMT_GEN_CLEANUP, (void (*)(void))dsa_gen_cleanup },
 569     { OSSL_FUNC_KEYMGMT_FREE, (void (*)(void))dsa_freedata },
 570     { OSSL_FUNC_KEYMGMT_GET_PARAMS, (void (*) (void))dsa_get_params },
 571     { OSSL_FUNC_KEYMGMT_GETTABLE_PARAMS, (void (*) (void))dsa_gettable_params },
 572     { OSSL_FUNC_KEYMGMT_HAS, (void (*)(void))dsa_has },
 573     { OSSL_FUNC_KEYMGMT_MATCH, (void (*)(void))dsa_match },
 574     { OSSL_FUNC_KEYMGMT_VALIDATE, (void (*)(void))dsa_validate },
 575     { OSSL_FUNC_KEYMGMT_IMPORT, (void (*)(void))dsa_import },
 576     { OSSL_FUNC_KEYMGMT_IMPORT_TYPES, (void (*)(void))dsa_import_types },
 577     { OSSL_FUNC_KEYMGMT_EXPORT, (void (*)(void))dsa_export },
 578     { OSSL_FUNC_KEYMGMT_EXPORT_TYPES, (void (*)(void))dsa_export_types },
 579     { 0, NULL }
 580 };