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