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_dispatch.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_FUNC_keymgmt_new_fn dsa_newdata;
  30 static OSSL_FUNC_keymgmt_free_fn dsa_freedata;
  31 static OSSL_FUNC_keymgmt_gen_init_fn dsa_gen_init;
  32 static OSSL_FUNC_keymgmt_gen_set_template_fn dsa_gen_set_template;
  33 static OSSL_FUNC_keymgmt_gen_set_params_fn dsa_gen_set_params;
  34 static OSSL_FUNC_keymgmt_gen_settable_params_fn dsa_gen_settable_params;
  35 static OSSL_FUNC_keymgmt_gen_fn dsa_gen;
  36 static OSSL_FUNC_keymgmt_gen_cleanup_fn dsa_gen_cleanup;
  37 static OSSL_FUNC_keymgmt_load_fn dsa_load;
  38 static OSSL_FUNC_keymgmt_get_params_fn dsa_get_params;
  39 static OSSL_FUNC_keymgmt_gettable_params_fn dsa_gettable_params;
  40 static OSSL_FUNC_keymgmt_has_fn dsa_has;
  41 static OSSL_FUNC_keymgmt_match_fn dsa_match;
  42 static OSSL_FUNC_keymgmt_validate_fn dsa_validate;
  43 static OSSL_FUNC_keymgmt_import_fn dsa_import;
  44 static OSSL_FUNC_keymgmt_import_types_fn dsa_import_types;
  45 static OSSL_FUNC_keymgmt_export_fn dsa_export;
  46 static OSSL_FUNC_keymgmt_export_types_fn dsa_export_types;
  47
  48 #define DSA_DEFAULT_MD "SHA256"
  49 #define DSA_POSSIBLE_SELECTIONS                                                \
  50     (OSSL_KEYMGMT_SELECT_KEYPAIR | OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS)
  51
  52 struct dsa_gen_ctx {
  53     OSSL_LIB_CTX *libctx;
  54
  55     FFC_PARAMS *ffc_params;
  56     int selection;
  57     /* All these parameters are used for parameter generation only */
  58     size_t pbits;
  59     size_t qbits;
  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     const char *mdname;
  67     const char *mdprops;
  68     OSSL_CALLBACK *cb;
  69     void *cbarg;
  70 };
  71 typedef struct dh_name2id_st{
  72     const char *name;
  73     int id;
  74 } DSA_GENTYPE_NAME2ID;
  75
  76 static const DSA_GENTYPE_NAME2ID dsatype2id[]=
  77 {
  78     { "default", DSA_PARAMGEN_TYPE_FIPS_186_4 },
  79     { "fips186_4", DSA_PARAMGEN_TYPE_FIPS_186_4 },
  80     { "fips186_2", DSA_PARAMGEN_TYPE_FIPS_186_2 },
  81 };
  82
  83 static int dsa_gen_type_name2id(const char *name)
  84 {
  85     size_t i;
  86
  87     for (i = 0; i < OSSL_NELEM(dsatype2id); ++i) {
  88         if (strcasecmp(dsatype2id[i].name, name) == 0)
  89             return dsatype2id[i].id;
  90     }
  91     return -1;
  92 }
  93
  94 static int dsa_key_todata(DSA *dsa, OSSL_PARAM_BLD *bld, OSSL_PARAM params[])
  95 {
  96     const BIGNUM *priv = NULL, *pub = NULL;
  97
  98     if (dsa == NULL)
  99         return 0;
 100
 101     DSA_get0_key(dsa, &pub, &priv);
 102     if (priv != NULL
 103         && !ossl_param_build_set_bn(bld, params, OSSL_PKEY_PARAM_PRIV_KEY, priv))
 104         return 0;
 105     if (pub != NULL
 106         && !ossl_param_build_set_bn(bld, params, OSSL_PKEY_PARAM_PUB_KEY, pub))
 107         return 0;
 108
 109     return 1;
 110 }
 111
 112 static void *dsa_newdata(void *provctx)
 113 {
 114     if (!ossl_prov_is_running())
 115         return NULL;
 116     return dsa_new_with_ctx(PROV_LIBCTX_OF(provctx));
 117 }
 118
 119 static void dsa_freedata(void *keydata)
 120 {
 121     DSA_free(keydata);
 122 }
 123
 124 static int dsa_has(void *keydata, int selection)
 125 {
 126     DSA *dsa = keydata;
 127     int ok = 0;
 128
 129     if (ossl_prov_is_running() && dsa != NULL) {
 130         if ((selection & DSA_POSSIBLE_SELECTIONS) != 0)
 131             ok = 1;
 132
 133         if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
 134             ok = ok && (DSA_get0_pub_key(dsa) != NULL);
 135         if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 136             ok = ok && (DSA_get0_priv_key(dsa) != NULL);
 137         if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
 138             ok = ok && (DSA_get0_p(dsa) != NULL && DSA_get0_g(dsa) != NULL);
 139     }
 140     return ok;
 141 }
 142
 143 static int dsa_match(const void *keydata1, const void *keydata2, int selection)
 144 {
 145     const DSA *dsa1 = keydata1;
 146     const DSA *dsa2 = keydata2;
 147     int ok = 1;
 148
 149     if (!ossl_prov_is_running())
 150         return 0;
 151
 152     if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
 153         ok = ok
 154             && BN_cmp(DSA_get0_pub_key(dsa1), DSA_get0_pub_key(dsa2)) == 0;
 155     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 156         ok = ok
 157             && BN_cmp(DSA_get0_priv_key(dsa1), DSA_get0_priv_key(dsa2)) == 0;
 158     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0) {
 159         FFC_PARAMS *dsaparams1 = dsa_get0_params((DSA *)dsa1);
 160         FFC_PARAMS *dsaparams2 = dsa_get0_params((DSA *)dsa2);
 161
 162         ok = ok && ossl_ffc_params_cmp(dsaparams1, dsaparams2, 1);
 163     }
 164     return ok;
 165 }
 166
 167 static int dsa_import(void *keydata, int selection, const OSSL_PARAM params[])
 168 {
 169     DSA *dsa = keydata;
 170     int ok = 1;
 171
 172     if (!ossl_prov_is_running() || dsa == NULL)
 173         return 0;
 174
 175     if ((selection & DSA_POSSIBLE_SELECTIONS) == 0)
 176         return 0;
 177
 178     if ((selection & OSSL_KEYMGMT_SELECT_ALL_PARAMETERS) != 0)
 179         ok = ok && dsa_ffc_params_fromdata(dsa, params);
 180     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
 181         ok = ok && dsa_key_fromdata(dsa, params);
 182
 183     return ok;
 184 }
 185
 186 static int dsa_export(void *keydata, int selection, OSSL_CALLBACK *param_cb,
 187                       void *cbarg)
 188 {
 189     DSA *dsa = keydata;
 190     OSSL_PARAM_BLD *tmpl = OSSL_PARAM_BLD_new();
 191     OSSL_PARAM *params = NULL;
 192     int ok = 1;
 193
 194     if (!ossl_prov_is_running() || dsa == NULL)
 195         goto err;
 196
 197     if ((selection & OSSL_KEYMGMT_SELECT_ALL_PARAMETERS) != 0)
 198         ok = ok && ossl_ffc_params_todata(dsa_get0_params(dsa), tmpl, NULL);
 199     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
 200         ok = ok && dsa_key_todata(dsa, tmpl, NULL);
 201
 202     if (!ok
 203         || (params = OSSL_PARAM_BLD_to_param(tmpl)) == NULL)
 204         goto err;;
 205
 206     ok = param_cb(params, cbarg);
 207     OSSL_PARAM_BLD_free_params(params);
 208 err:
 209     OSSL_PARAM_BLD_free(tmpl);
 210     return ok;
 211 }
 212
 213 /* IMEXPORT = IMPORT + EXPORT */
 214
 215 # define DSA_IMEXPORTABLE_PARAMETERS                                           \
 216     OSSL_PARAM_BN(OSSL_PKEY_PARAM_FFC_P, NULL, 0),                             \
 217     OSSL_PARAM_BN(OSSL_PKEY_PARAM_FFC_Q, NULL, 0),                             \
 218     OSSL_PARAM_BN(OSSL_PKEY_PARAM_FFC_G, NULL, 0),                             \
 219     OSSL_PARAM_BN(OSSL_PKEY_PARAM_FFC_COFACTOR, NULL, 0),                      \
 220     OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_GINDEX, NULL),                          \
 221     OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_PCOUNTER, NULL),                        \
 222     OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_H, NULL),                               \
 223     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_FFC_SEED, NULL, 0)
 224 # define DSA_IMEXPORTABLE_PUBLIC_KEY                    \
 225     OSSL_PARAM_BN(OSSL_PKEY_PARAM_PUB_KEY, NULL, 0)
 226 # define DSA_IMEXPORTABLE_PRIVATE_KEY                   \
 227     OSSL_PARAM_BN(OSSL_PKEY_PARAM_PRIV_KEY, NULL, 0)
 228 static const OSSL_PARAM dsa_all_types[] = {
 229     DSA_IMEXPORTABLE_PARAMETERS,
 230     DSA_IMEXPORTABLE_PUBLIC_KEY,
 231     DSA_IMEXPORTABLE_PRIVATE_KEY,
 232     OSSL_PARAM_END
 233 };
 234 static const OSSL_PARAM dsa_parameter_types[] = {
 235     DSA_IMEXPORTABLE_PARAMETERS,
 236     OSSL_PARAM_END
 237 };
 238 static const OSSL_PARAM dsa_key_types[] = {
 239     DSA_IMEXPORTABLE_PUBLIC_KEY,
 240     DSA_IMEXPORTABLE_PRIVATE_KEY,
 241     OSSL_PARAM_END
 242 };
 243 static const OSSL_PARAM *dsa_types[] = {
 244     NULL,                        /* Index 0 = none of them */
 245     dsa_parameter_types,          /* Index 1 = parameter types */
 246     dsa_key_types,                /* Index 2 = key types */
 247     dsa_all_types                 /* Index 3 = 1 + 2 */
 248 };
 249
 250 static const OSSL_PARAM *dsa_imexport_types(int selection)
 251 {
 252     int type_select = 0;
 253
 254     if ((selection & OSSL_KEYMGMT_SELECT_ALL_PARAMETERS) != 0)
 255         type_select += 1;
 256     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
 257         type_select += 2;
 258     return dsa_types[type_select];
 259 }
 260
 261 static const OSSL_PARAM *dsa_import_types(int selection)
 262 {
 263     return dsa_imexport_types(selection);
 264 }
 265
 266 static const OSSL_PARAM *dsa_export_types(int selection)
 267 {
 268     return dsa_imexport_types(selection);
 269 }
 270
 271 static ossl_inline int dsa_get_params(void *key, OSSL_PARAM params[])
 272 {
 273     DSA *dsa = key;
 274     OSSL_PARAM *p;
 275
 276     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_BITS)) != NULL
 277         && !OSSL_PARAM_set_int(p, DSA_bits(dsa)))
 278         return 0;
 279     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_SECURITY_BITS)) != NULL
 280         && !OSSL_PARAM_set_int(p, DSA_security_bits(dsa)))
 281         return 0;
 282     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_MAX_SIZE)) != NULL
 283         && !OSSL_PARAM_set_int(p, DSA_size(dsa)))
 284         return 0;
 285     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_DEFAULT_DIGEST)) != NULL
 286         && !OSSL_PARAM_set_utf8_string(p, DSA_DEFAULT_MD))
 287         return 0;
 288     return ossl_ffc_params_todata(dsa_get0_params(dsa), NULL, params)
 289            && dsa_key_todata(dsa, NULL, params);
 290 }
 291
 292 static const OSSL_PARAM dsa_params[] = {
 293     OSSL_PARAM_int(OSSL_PKEY_PARAM_BITS, NULL),
 294     OSSL_PARAM_int(OSSL_PKEY_PARAM_SECURITY_BITS, NULL),
 295     OSSL_PARAM_int(OSSL_PKEY_PARAM_MAX_SIZE, NULL),
 296     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_DEFAULT_DIGEST, NULL, 0),
 297     DSA_IMEXPORTABLE_PARAMETERS,
 298     DSA_IMEXPORTABLE_PUBLIC_KEY,
 299     DSA_IMEXPORTABLE_PRIVATE_KEY,
 300     OSSL_PARAM_END
 301 };
 302
 303 static const OSSL_PARAM *dsa_gettable_params(void *provctx)
 304 {
 305     return dsa_params;
 306 }
 307
 308 static int dsa_validate_domparams(DSA *dsa)
 309 {
 310     int status = 0;
 311
 312     return dsa_check_params(dsa, &status);
 313 }
 314
 315 static int dsa_validate_public(DSA *dsa)
 316 {
 317     int status = 0;
 318     const BIGNUM *pub_key = NULL;
 319
 320     DSA_get0_key(dsa, &pub_key, NULL);
 321     if (pub_key == NULL)
 322         return 0;
 323     return dsa_check_pub_key(dsa, pub_key, &status);
 324 }
 325
 326 static int dsa_validate_private(DSA *dsa)
 327 {
 328     int status = 0;
 329     const BIGNUM *priv_key = NULL;
 330
 331     DSA_get0_key(dsa, NULL, &priv_key);
 332     if (priv_key == NULL)
 333         return 0;
 334     return dsa_check_priv_key(dsa, priv_key, &status);
 335 }
 336
 337 static int dsa_validate(void *keydata, int selection)
 338 {
 339     DSA *dsa = keydata;
 340     int ok = 0;
 341
 342     if (!ossl_prov_is_running())
 343         return 0;
 344
 345     if ((selection & DSA_POSSIBLE_SELECTIONS) != 0)
 346         ok = 1;
 347
 348     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
 349         ok = ok && dsa_validate_domparams(dsa);
 350
 351     if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
 352         ok = ok && dsa_validate_public(dsa);
 353
 354     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 355         ok = ok && dsa_validate_private(dsa);
 356
 357     /* If the whole key is selected, we do a pairwise validation */
 358     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR)
 359         == OSSL_KEYMGMT_SELECT_KEYPAIR)
 360         ok = ok && dsa_check_pairwise(dsa);
 361     return ok;
 362 }
 363
 364 static void *dsa_gen_init(void *provctx, int selection)
 365 {
 366     OSSL_LIB_CTX *libctx = PROV_LIBCTX_OF(provctx);
 367     struct dsa_gen_ctx *gctx = NULL;
 368
 369     if (!ossl_prov_is_running() || (selection & DSA_POSSIBLE_SELECTIONS) == 0)
 370         return NULL;
 371
 372     if ((gctx = OPENSSL_zalloc(sizeof(*gctx))) != NULL) {
 373         gctx->selection = selection;
 374         gctx->libctx = libctx;
 375         gctx->pbits = 2048;
 376         gctx->qbits = 224;
 377         gctx->gen_type = DSA_PARAMGEN_TYPE_FIPS_186_4;
 378         gctx->gindex = -1;
 379         gctx->pcounter = -1;
 380         gctx->hindex = 0;
 381     }
 382     return gctx;
 383 }
 384
 385 static int dsa_gen_set_template(void *genctx, void *templ)
 386 {
 387     struct dsa_gen_ctx *gctx = genctx;
 388     DSA *dsa = templ;
 389
 390     if (!ossl_prov_is_running() || gctx == NULL || dsa == NULL)
 391         return 0;
 392     gctx->ffc_params = dsa_get0_params(dsa);
 393     return 1;
 394 }
 395
 396 static int dsa_set_gen_seed(struct dsa_gen_ctx *gctx, unsigned char *seed,
 397                             size_t seedlen)
 398 {
 399     OPENSSL_clear_free(gctx->seed, gctx->seedlen);
 400     gctx->seed = NULL;
 401     gctx->seedlen = 0;
 402     if (seed != NULL && seedlen > 0) {
 403         gctx->seed = OPENSSL_memdup(seed, seedlen);
 404         if (gctx->seed == NULL)
 405             return 0;
 406         gctx->seedlen = seedlen;
 407     }
 408     return 1;
 409 }
 410
 411 static int dsa_gen_set_params(void *genctx, const OSSL_PARAM params[])
 412 {
 413     struct dsa_gen_ctx *gctx = genctx;
 414     const OSSL_PARAM *p;
 415
 416     if (gctx == NULL)
 417         return 0;
 418
 419     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_TYPE);
 420     if (p != NULL) {
 421         if (p->data_type != OSSL_PARAM_UTF8_STRING
 422             || ((gctx->gen_type = dsa_gen_type_name2id(p->data)) == -1)) {
 423             ERR_raise(ERR_LIB_PROV, ERR_R_PASSED_INVALID_ARGUMENT);
 424             return 0;
 425         }
 426     }
 427     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_GINDEX);
 428     if (p != NULL
 429         && !OSSL_PARAM_get_int(p, &gctx->gindex))
 430         return 0;
 431     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_PCOUNTER);
 432     if (p != NULL
 433         && !OSSL_PARAM_get_int(p, &gctx->pcounter))
 434         return 0;
 435     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_H);
 436     if (p != NULL
 437         && !OSSL_PARAM_get_int(p, &gctx->hindex))
 438         return 0;
 439     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_SEED);
 440     if (p != NULL
 441         && (p->data_type != OSSL_PARAM_OCTET_STRING
 442             || !dsa_set_gen_seed(gctx, p->data, p->data_size)))
 443             return 0;
 444     if ((p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_PBITS)) != NULL
 445         && !OSSL_PARAM_get_size_t(p, &gctx->pbits))
 446         return 0;
 447     if ((p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_QBITS)) != NULL
 448         && !OSSL_PARAM_get_size_t(p, &gctx->qbits))
 449         return 0;
 450     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_DIGEST);
 451     if (p != NULL) {
 452         if (p->data_type != OSSL_PARAM_UTF8_STRING)
 453             return 0;
 454         gctx->mdname = p->data;
 455     }
 456     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_DIGEST_PROPS);
 457     if (p != NULL) {
 458         if (p->data_type != OSSL_PARAM_UTF8_STRING)
 459             return 0;
 460         gctx->mdprops = p->data;
 461     }
 462     return 1;
 463 }
 464
 465 static const OSSL_PARAM *dsa_gen_settable_params(void *provctx)
 466 {
 467     static OSSL_PARAM settable[] = {
 468         OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_FFC_TYPE, NULL, 0),
 469         OSSL_PARAM_size_t(OSSL_PKEY_PARAM_FFC_PBITS, NULL),
 470         OSSL_PARAM_size_t(OSSL_PKEY_PARAM_FFC_QBITS, NULL),
 471         OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_FFC_DIGEST, NULL, 0),
 472         OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_FFC_DIGEST_PROPS, NULL, 0),
 473         OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_GINDEX, NULL),
 474         OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_FFC_SEED, NULL, 0),
 475         OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_PCOUNTER, NULL),
 476         OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_H, NULL),
 477         OSSL_PARAM_END
 478     };
 479     return settable;
 480 }
 481
 482 static int dsa_gencb(int p, int n, BN_GENCB *cb)
 483 {
 484     struct dsa_gen_ctx *gctx = BN_GENCB_get_arg(cb);
 485     OSSL_PARAM params[] = { OSSL_PARAM_END, OSSL_PARAM_END, OSSL_PARAM_END };
 486
 487     params[0] = OSSL_PARAM_construct_int(OSSL_GEN_PARAM_POTENTIAL, &p);
 488     params[1] = OSSL_PARAM_construct_int(OSSL_GEN_PARAM_ITERATION, &n);
 489
 490     return gctx->cb(params, gctx->cbarg);
 491 }
 492
 493 static void *dsa_gen(void *genctx, OSSL_CALLBACK *osslcb, void *cbarg)
 494 {
 495     struct dsa_gen_ctx *gctx = genctx;
 496     DSA *dsa = NULL;
 497     BN_GENCB *gencb = NULL;
 498     int ret = 0;
 499     FFC_PARAMS *ffc;
 500
 501     if (!ossl_prov_is_running() || gctx == NULL)
 502         return NULL;
 503     dsa = dsa_new_with_ctx(gctx->libctx);
 504     if (dsa == NULL)
 505         return NULL;
 506
 507     gctx->cb = osslcb;
 508     gctx->cbarg = cbarg;
 509     gencb = BN_GENCB_new();
 510     if (gencb != NULL)
 511         BN_GENCB_set(gencb, dsa_gencb, genctx);
 512
 513     ffc = dsa_get0_params(dsa);
 514     /* Copy the template value if one was passed */
 515     if (gctx->ffc_params != NULL
 516         && !ossl_ffc_params_copy(ffc, gctx->ffc_params))
 517         goto end;
 518
 519     if (gctx->seed != NULL
 520         && !ossl_ffc_params_set_seed(ffc, gctx->seed, gctx->seedlen))
 521         goto end;
 522     if (gctx->gindex != -1) {
 523         ossl_ffc_params_set_gindex(ffc, gctx->gindex);
 524         if (gctx->pcounter != -1)
 525             ossl_ffc_params_set_pcounter(ffc, gctx->pcounter);
 526     } else if (gctx->hindex != 0) {
 527         ossl_ffc_params_set_h(ffc, gctx->hindex);
 528     }
 529     if (gctx->mdname != NULL) {
 530         if (!ossl_ffc_set_digest(ffc, gctx->mdname, gctx->mdprops))
 531             goto end;
 532     }
 533     if ((gctx->selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0) {
 534
 535          if (dsa_generate_ffc_parameters(dsa, gctx->gen_type,
 536                                          gctx->pbits, gctx->qbits,
 537                                          gencb) <= 0)
 538              goto end;
 539     }
 540     ossl_ffc_params_enable_flags(ffc, FFC_PARAM_FLAG_VALIDATE_LEGACY,
 541                                  gctx->gen_type == DSA_PARAMGEN_TYPE_FIPS_186_2);
 542     if ((gctx->selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0) {
 543         if (ffc->p == NULL
 544             || ffc->q == NULL
 545             || ffc->g == NULL)
 546             goto end;
 547         if (DSA_generate_key(dsa) <= 0)
 548             goto end;
 549     }
 550     ret = 1;
 551 end:
 552     if (ret <= 0) {
 553         DSA_free(dsa);
 554         dsa = NULL;
 555     }
 556     BN_GENCB_free(gencb);
 557     return dsa;
 558 }
 559
 560 static void dsa_gen_cleanup(void *genctx)
 561 {
 562     struct dsa_gen_ctx *gctx = genctx;
 563
 564     if (gctx == NULL)
 565         return;
 566
 567     OPENSSL_clear_free(gctx->seed, gctx->seedlen);
 568     OPENSSL_free(gctx);
 569 }
 570
 571 void *dsa_load(const void *reference, size_t reference_sz)
 572 {
 573     DSA *dsa = NULL;
 574
 575     if (ossl_prov_is_running() && reference_sz == sizeof(dsa)) {
 576         /* The contents of the reference is the address to our object */
 577         dsa = *(DSA **)reference;
 578         /* We grabbed, so we detach it */
 579         *(DSA **)reference = NULL;
 580         return dsa;
 581     }
 582     return NULL;
 583 }
 584
 585 const OSSL_DISPATCH ossl_dsa_keymgmt_functions[] = {
 586     { OSSL_FUNC_KEYMGMT_NEW, (void (*)(void))dsa_newdata },
 587     { OSSL_FUNC_KEYMGMT_GEN_INIT, (void (*)(void))dsa_gen_init },
 588     { OSSL_FUNC_KEYMGMT_GEN_SET_TEMPLATE, (void (*)(void))dsa_gen_set_template },
 589     { OSSL_FUNC_KEYMGMT_GEN_SET_PARAMS, (void (*)(void))dsa_gen_set_params },
 590     { OSSL_FUNC_KEYMGMT_GEN_SETTABLE_PARAMS,
 591       (void (*)(void))dsa_gen_settable_params },
 592     { OSSL_FUNC_KEYMGMT_GEN, (void (*)(void))dsa_gen },
 593     { OSSL_FUNC_KEYMGMT_GEN_CLEANUP, (void (*)(void))dsa_gen_cleanup },
 594     { OSSL_FUNC_KEYMGMT_LOAD, (void (*)(void))dsa_load },
 595     { OSSL_FUNC_KEYMGMT_FREE, (void (*)(void))dsa_freedata },
 596     { OSSL_FUNC_KEYMGMT_GET_PARAMS, (void (*) (void))dsa_get_params },
 597     { OSSL_FUNC_KEYMGMT_GETTABLE_PARAMS, (void (*) (void))dsa_gettable_params },
 598     { OSSL_FUNC_KEYMGMT_HAS, (void (*)(void))dsa_has },
 599     { OSSL_FUNC_KEYMGMT_MATCH, (void (*)(void))dsa_match },
 600     { OSSL_FUNC_KEYMGMT_VALIDATE, (void (*)(void))dsa_validate },
 601     { OSSL_FUNC_KEYMGMT_IMPORT, (void (*)(void))dsa_import },
 602     { OSSL_FUNC_KEYMGMT_IMPORT_TYPES, (void (*)(void))dsa_import_types },
 603     { OSSL_FUNC_KEYMGMT_EXPORT, (void (*)(void))dsa_export },
 604     { OSSL_FUNC_KEYMGMT_EXPORT_TYPES, (void (*)(void))dsa_export_types },
 605     { 0, NULL }
 606 };