providers/implementations/keymgmt/dsa_kmgmt.c

   1 /*
   2  * Copyright 2019-2021 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  * 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     char *mdname;
  67     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 #ifdef FIPS_MODULE
  79     { "default", DSA_PARAMGEN_TYPE_FIPS_186_4 },
  80 #else
  81     { "default", DSA_PARAMGEN_TYPE_FIPS_186_2 },
  82 #endif
  83     { "fips186_4", DSA_PARAMGEN_TYPE_FIPS_186_4 },
  84     { "fips186_2", DSA_PARAMGEN_TYPE_FIPS_186_2 },
  85 };
  86
  87 static int dsa_gen_type_name2id(const char *name)
  88 {
  89     size_t i;
  90
  91     for (i = 0; i < OSSL_NELEM(dsatype2id); ++i) {
  92         if (strcasecmp(dsatype2id[i].name, name) == 0)
  93             return dsatype2id[i].id;
  94     }
  95     return -1;
  96 }
  97
  98 static int dsa_key_todata(DSA *dsa, OSSL_PARAM_BLD *bld, OSSL_PARAM params[])
  99 {
 100     const BIGNUM *priv = NULL, *pub = NULL;
 101
 102     if (dsa == NULL)
 103         return 0;
 104
 105     DSA_get0_key(dsa, &pub, &priv);
 106     if (priv != NULL
 107         && !ossl_param_build_set_bn(bld, params, OSSL_PKEY_PARAM_PRIV_KEY, priv))
 108         return 0;
 109     if (pub != NULL
 110         && !ossl_param_build_set_bn(bld, params, OSSL_PKEY_PARAM_PUB_KEY, pub))
 111         return 0;
 112
 113     return 1;
 114 }
 115
 116 static void *dsa_newdata(void *provctx)
 117 {
 118     if (!ossl_prov_is_running())
 119         return NULL;
 120     return ossl_dsa_new(PROV_LIBCTX_OF(provctx));
 121 }
 122
 123 static void dsa_freedata(void *keydata)
 124 {
 125     DSA_free(keydata);
 126 }
 127
 128 static int dsa_has(const void *keydata, int selection)
 129 {
 130     const DSA *dsa = keydata;
 131     int ok = 0;
 132
 133     if (ossl_prov_is_running() && dsa != NULL) {
 134         if ((selection & DSA_POSSIBLE_SELECTIONS) != 0)
 135             ok = 1;
 136
 137         if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
 138             ok = ok && (DSA_get0_pub_key(dsa) != NULL);
 139         if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 140             ok = ok && (DSA_get0_priv_key(dsa) != NULL);
 141         if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
 142             ok = ok && (DSA_get0_p(dsa) != NULL && DSA_get0_g(dsa) != NULL);
 143     }
 144     return ok;
 145 }
 146
 147 static int dsa_match(const void *keydata1, const void *keydata2, int selection)
 148 {
 149     const DSA *dsa1 = keydata1;
 150     const DSA *dsa2 = keydata2;
 151     int ok = 1;
 152
 153     if (!ossl_prov_is_running())
 154         return 0;
 155
 156     if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
 157         ok = ok
 158             && BN_cmp(DSA_get0_pub_key(dsa1), DSA_get0_pub_key(dsa2)) == 0;
 159     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 160         ok = ok
 161             && BN_cmp(DSA_get0_priv_key(dsa1), DSA_get0_priv_key(dsa2)) == 0;
 162     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0) {
 163         FFC_PARAMS *dsaparams1 = ossl_dsa_get0_params((DSA *)dsa1);
 164         FFC_PARAMS *dsaparams2 = ossl_dsa_get0_params((DSA *)dsa2);
 165
 166         ok = ok && ossl_ffc_params_cmp(dsaparams1, dsaparams2, 1);
 167     }
 168     return ok;
 169 }
 170
 171 static int dsa_import(void *keydata, int selection, const OSSL_PARAM params[])
 172 {
 173     DSA *dsa = keydata;
 174     int ok = 1;
 175
 176     if (!ossl_prov_is_running() || dsa == NULL)
 177         return 0;
 178
 179     if ((selection & DSA_POSSIBLE_SELECTIONS) == 0)
 180         return 0;
 181
 182     if ((selection & OSSL_KEYMGMT_SELECT_ALL_PARAMETERS) != 0)
 183         ok = ok && ossl_dsa_ffc_params_fromdata(dsa, params);
 184     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
 185         ok = ok && ossl_dsa_key_fromdata(dsa, params);
 186
 187     return ok;
 188 }
 189
 190 static int dsa_export(void *keydata, int selection, OSSL_CALLBACK *param_cb,
 191                       void *cbarg)
 192 {
 193     DSA *dsa = keydata;
 194     OSSL_PARAM_BLD *tmpl = OSSL_PARAM_BLD_new();
 195     OSSL_PARAM *params = NULL;
 196     int ok = 1;
 197
 198     if (!ossl_prov_is_running() || dsa == NULL)
 199         goto err;
 200
 201     if ((selection & OSSL_KEYMGMT_SELECT_ALL_PARAMETERS) != 0)
 202         ok = ok && ossl_ffc_params_todata(ossl_dsa_get0_params(dsa), tmpl, NULL);
 203     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
 204         ok = ok && dsa_key_todata(dsa, tmpl, NULL);
 205
 206     if (!ok
 207         || (params = OSSL_PARAM_BLD_to_param(tmpl)) == NULL)
 208         goto err;;
 209
 210     ok = param_cb(params, cbarg);
 211     OSSL_PARAM_BLD_free_params(params);
 212 err:
 213     OSSL_PARAM_BLD_free(tmpl);
 214     return ok;
 215 }
 216
 217 /* IMEXPORT = IMPORT + EXPORT */
 218
 219 # define DSA_IMEXPORTABLE_PARAMETERS                                           \
 220     OSSL_PARAM_BN(OSSL_PKEY_PARAM_FFC_P, NULL, 0),                             \
 221     OSSL_PARAM_BN(OSSL_PKEY_PARAM_FFC_Q, NULL, 0),                             \
 222     OSSL_PARAM_BN(OSSL_PKEY_PARAM_FFC_G, NULL, 0),                             \
 223     OSSL_PARAM_BN(OSSL_PKEY_PARAM_FFC_COFACTOR, NULL, 0),                      \
 224     OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_GINDEX, NULL),                          \
 225     OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_PCOUNTER, NULL),                        \
 226     OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_H, NULL),                               \
 227     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_FFC_SEED, NULL, 0)
 228 # define DSA_IMEXPORTABLE_PUBLIC_KEY                    \
 229     OSSL_PARAM_BN(OSSL_PKEY_PARAM_PUB_KEY, NULL, 0)
 230 # define DSA_IMEXPORTABLE_PRIVATE_KEY                   \
 231     OSSL_PARAM_BN(OSSL_PKEY_PARAM_PRIV_KEY, NULL, 0)
 232 static const OSSL_PARAM dsa_all_types[] = {
 233     DSA_IMEXPORTABLE_PARAMETERS,
 234     DSA_IMEXPORTABLE_PUBLIC_KEY,
 235     DSA_IMEXPORTABLE_PRIVATE_KEY,
 236     OSSL_PARAM_END
 237 };
 238 static const OSSL_PARAM dsa_parameter_types[] = {
 239     DSA_IMEXPORTABLE_PARAMETERS,
 240     OSSL_PARAM_END
 241 };
 242 static const OSSL_PARAM dsa_key_types[] = {
 243     DSA_IMEXPORTABLE_PUBLIC_KEY,
 244     DSA_IMEXPORTABLE_PRIVATE_KEY,
 245     OSSL_PARAM_END
 246 };
 247 static const OSSL_PARAM *dsa_types[] = {
 248     NULL,                        /* Index 0 = none of them */
 249     dsa_parameter_types,          /* Index 1 = parameter types */
 250     dsa_key_types,                /* Index 2 = key types */
 251     dsa_all_types                 /* Index 3 = 1 + 2 */
 252 };
 253
 254 static const OSSL_PARAM *dsa_imexport_types(int selection)
 255 {
 256     int type_select = 0;
 257
 258     if ((selection & OSSL_KEYMGMT_SELECT_ALL_PARAMETERS) != 0)
 259         type_select += 1;
 260     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
 261         type_select += 2;
 262     return dsa_types[type_select];
 263 }
 264
 265 static const OSSL_PARAM *dsa_import_types(int selection)
 266 {
 267     return dsa_imexport_types(selection);
 268 }
 269
 270 static const OSSL_PARAM *dsa_export_types(int selection)
 271 {
 272     return dsa_imexport_types(selection);
 273 }
 274
 275 static ossl_inline int dsa_get_params(void *key, OSSL_PARAM params[])
 276 {
 277     DSA *dsa = key;
 278     OSSL_PARAM *p;
 279
 280     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_BITS)) != NULL
 281         && !OSSL_PARAM_set_int(p, DSA_bits(dsa)))
 282         return 0;
 283     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_SECURITY_BITS)) != NULL
 284         && !OSSL_PARAM_set_int(p, DSA_security_bits(dsa)))
 285         return 0;
 286     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_MAX_SIZE)) != NULL
 287         && !OSSL_PARAM_set_int(p, DSA_size(dsa)))
 288         return 0;
 289     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_DEFAULT_DIGEST)) != NULL
 290         && !OSSL_PARAM_set_utf8_string(p, DSA_DEFAULT_MD))
 291         return 0;
 292     return ossl_ffc_params_todata(ossl_dsa_get0_params(dsa), NULL, params)
 293            && dsa_key_todata(dsa, NULL, params);
 294 }
 295
 296 static const OSSL_PARAM dsa_params[] = {
 297     OSSL_PARAM_int(OSSL_PKEY_PARAM_BITS, NULL),
 298     OSSL_PARAM_int(OSSL_PKEY_PARAM_SECURITY_BITS, NULL),
 299     OSSL_PARAM_int(OSSL_PKEY_PARAM_MAX_SIZE, NULL),
 300     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_DEFAULT_DIGEST, NULL, 0),
 301     DSA_IMEXPORTABLE_PARAMETERS,
 302     DSA_IMEXPORTABLE_PUBLIC_KEY,
 303     DSA_IMEXPORTABLE_PRIVATE_KEY,
 304     OSSL_PARAM_END
 305 };
 306
 307 static const OSSL_PARAM *dsa_gettable_params(void *provctx)
 308 {
 309     return dsa_params;
 310 }
 311
 312 static int dsa_validate_domparams(const DSA *dsa, int checktype)
 313 {
 314     int status = 0;
 315
 316     return ossl_dsa_check_params(dsa, checktype, &status);
 317 }
 318
 319 static int dsa_validate_public(const DSA *dsa)
 320 {
 321     int status = 0;
 322     const BIGNUM *pub_key = NULL;
 323
 324     DSA_get0_key(dsa, &pub_key, NULL);
 325     if (pub_key == NULL)
 326         return 0;
 327     return ossl_dsa_check_pub_key(dsa, pub_key, &status);
 328 }
 329
 330 static int dsa_validate_private(const DSA *dsa)
 331 {
 332     int status = 0;
 333     const BIGNUM *priv_key = NULL;
 334
 335     DSA_get0_key(dsa, NULL, &priv_key);
 336     if (priv_key == NULL)
 337         return 0;
 338     return ossl_dsa_check_priv_key(dsa, priv_key, &status);
 339 }
 340
 341 static int dsa_validate(const void *keydata, int selection, int checktype)
 342 {
 343     const DSA *dsa = keydata;
 344     int ok = 0;
 345
 346     if (!ossl_prov_is_running())
 347         return 0;
 348
 349     if ((selection & DSA_POSSIBLE_SELECTIONS) != 0)
 350         ok = 1;
 351
 352     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
 353         ok = ok && dsa_validate_domparams(dsa, checktype);
 354
 355     if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
 356         ok = ok && dsa_validate_public(dsa);
 357
 358     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 359         ok = ok && dsa_validate_private(dsa);
 360
 361     /* If the whole key is selected, we do a pairwise validation */
 362     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR)
 363         == OSSL_KEYMGMT_SELECT_KEYPAIR)
 364         ok = ok && ossl_dsa_check_pairwise(dsa);
 365     return ok;
 366 }
 367
 368 static void *dsa_gen_init(void *provctx, int selection,
 369                           const OSSL_PARAM params[])
 370 {
 371     OSSL_LIB_CTX *libctx = PROV_LIBCTX_OF(provctx);
 372     struct dsa_gen_ctx *gctx = NULL;
 373
 374     if (!ossl_prov_is_running() || (selection & DSA_POSSIBLE_SELECTIONS) == 0)
 375         return NULL;
 376
 377     if ((gctx = OPENSSL_zalloc(sizeof(*gctx))) != NULL) {
 378         gctx->selection = selection;
 379         gctx->libctx = libctx;
 380         gctx->pbits = 2048;
 381         gctx->qbits = 224;
 382 #ifdef FIPS_MODULE
 383         gctx->gen_type = DSA_PARAMGEN_TYPE_FIPS_186_4;
 384 #else
 385         gctx->gen_type = DSA_PARAMGEN_TYPE_FIPS_186_2;
 386 #endif
 387         gctx->gindex = -1;
 388         gctx->pcounter = -1;
 389         gctx->hindex = 0;
 390     }
 391     if (!dsa_gen_set_params(gctx, params)) {
 392         OPENSSL_free(gctx);
 393         gctx = NULL;
 394     }
 395     return gctx;
 396 }
 397
 398 static int dsa_gen_set_template(void *genctx, void *templ)
 399 {
 400     struct dsa_gen_ctx *gctx = genctx;
 401     DSA *dsa = templ;
 402
 403     if (!ossl_prov_is_running() || gctx == NULL || dsa == NULL)
 404         return 0;
 405     gctx->ffc_params = ossl_dsa_get0_params(dsa);
 406     return 1;
 407 }
 408
 409 static int dsa_set_gen_seed(struct dsa_gen_ctx *gctx, unsigned char *seed,
 410                             size_t seedlen)
 411 {
 412     OPENSSL_clear_free(gctx->seed, gctx->seedlen);
 413     gctx->seed = NULL;
 414     gctx->seedlen = 0;
 415     if (seed != NULL && seedlen > 0) {
 416         gctx->seed = OPENSSL_memdup(seed, seedlen);
 417         if (gctx->seed == NULL)
 418             return 0;
 419         gctx->seedlen = seedlen;
 420     }
 421     return 1;
 422 }
 423
 424 static int dsa_gen_set_params(void *genctx, const OSSL_PARAM params[])
 425 {
 426     struct dsa_gen_ctx *gctx = genctx;
 427     const OSSL_PARAM *p;
 428
 429     if (gctx == NULL)
 430         return 0;
 431     if (params == NULL)
 432         return 1;
 433
 434
 435     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_TYPE);
 436     if (p != NULL) {
 437         if (p->data_type != OSSL_PARAM_UTF8_STRING
 438             || ((gctx->gen_type = dsa_gen_type_name2id(p->data)) == -1)) {
 439             ERR_raise(ERR_LIB_PROV, ERR_R_PASSED_INVALID_ARGUMENT);
 440             return 0;
 441         }
 442     }
 443     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_GINDEX);
 444     if (p != NULL
 445         && !OSSL_PARAM_get_int(p, &gctx->gindex))
 446         return 0;
 447     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_PCOUNTER);
 448     if (p != NULL
 449         && !OSSL_PARAM_get_int(p, &gctx->pcounter))
 450         return 0;
 451     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_H);
 452     if (p != NULL
 453         && !OSSL_PARAM_get_int(p, &gctx->hindex))
 454         return 0;
 455     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_SEED);
 456     if (p != NULL
 457         && (p->data_type != OSSL_PARAM_OCTET_STRING
 458             || !dsa_set_gen_seed(gctx, p->data, p->data_size)))
 459             return 0;
 460     if ((p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_PBITS)) != NULL
 461         && !OSSL_PARAM_get_size_t(p, &gctx->pbits))
 462         return 0;
 463     if ((p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_QBITS)) != NULL
 464         && !OSSL_PARAM_get_size_t(p, &gctx->qbits))
 465         return 0;
 466     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_DIGEST);
 467     if (p != NULL) {
 468         if (p->data_type != OSSL_PARAM_UTF8_STRING)
 469             return 0;
 470         OPENSSL_free(gctx->mdname);
 471         gctx->mdname = OPENSSL_strdup(p->data);
 472         if (gctx->mdname == NULL)
 473             return 0;
 474     }
 475     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_DIGEST_PROPS);
 476     if (p != NULL) {
 477         if (p->data_type != OSSL_PARAM_UTF8_STRING)
 478             return 0;
 479         OPENSSL_free(gctx->mdprops);
 480         gctx->mdprops = OPENSSL_strdup(p->data);
 481         if (gctx->mdprops == NULL)
 482             return 0;
 483     }
 484     return 1;
 485 }
 486
 487 static const OSSL_PARAM *dsa_gen_settable_params(ossl_unused void *genctx,
 488                                                  ossl_unused void *provctx)
 489 {
 490     static OSSL_PARAM settable[] = {
 491         OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_FFC_TYPE, NULL, 0),
 492         OSSL_PARAM_size_t(OSSL_PKEY_PARAM_FFC_PBITS, NULL),
 493         OSSL_PARAM_size_t(OSSL_PKEY_PARAM_FFC_QBITS, NULL),
 494         OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_FFC_DIGEST, NULL, 0),
 495         OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_FFC_DIGEST_PROPS, NULL, 0),
 496         OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_GINDEX, NULL),
 497         OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_FFC_SEED, NULL, 0),
 498         OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_PCOUNTER, NULL),
 499         OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_H, NULL),
 500         OSSL_PARAM_END
 501     };
 502     return settable;
 503 }
 504
 505 static int dsa_gencb(int p, int n, BN_GENCB *cb)
 506 {
 507     struct dsa_gen_ctx *gctx = BN_GENCB_get_arg(cb);
 508     OSSL_PARAM params[] = { OSSL_PARAM_END, OSSL_PARAM_END, OSSL_PARAM_END };
 509
 510     params[0] = OSSL_PARAM_construct_int(OSSL_GEN_PARAM_POTENTIAL, &p);
 511     params[1] = OSSL_PARAM_construct_int(OSSL_GEN_PARAM_ITERATION, &n);
 512
 513     return gctx->cb(params, gctx->cbarg);
 514 }
 515
 516 static void *dsa_gen(void *genctx, OSSL_CALLBACK *osslcb, void *cbarg)
 517 {
 518     struct dsa_gen_ctx *gctx = genctx;
 519     DSA *dsa = NULL;
 520     BN_GENCB *gencb = NULL;
 521     int ret = 0;
 522     FFC_PARAMS *ffc;
 523
 524     if (!ossl_prov_is_running() || gctx == NULL)
 525         return NULL;
 526     dsa = ossl_dsa_new(gctx->libctx);
 527     if (dsa == NULL)
 528         return NULL;
 529
 530     gctx->cb = osslcb;
 531     gctx->cbarg = cbarg;
 532     gencb = BN_GENCB_new();
 533     if (gencb != NULL)
 534         BN_GENCB_set(gencb, dsa_gencb, genctx);
 535
 536     ffc = ossl_dsa_get0_params(dsa);
 537     /* Copy the template value if one was passed */
 538     if (gctx->ffc_params != NULL
 539         && !ossl_ffc_params_copy(ffc, gctx->ffc_params))
 540         goto end;
 541
 542     if (gctx->seed != NULL
 543         && !ossl_ffc_params_set_seed(ffc, gctx->seed, gctx->seedlen))
 544         goto end;
 545     if (gctx->gindex != -1) {
 546         ossl_ffc_params_set_gindex(ffc, gctx->gindex);
 547         if (gctx->pcounter != -1)
 548             ossl_ffc_params_set_pcounter(ffc, gctx->pcounter);
 549     } else if (gctx->hindex != 0) {
 550         ossl_ffc_params_set_h(ffc, gctx->hindex);
 551     }
 552     if (gctx->mdname != NULL) {
 553         if (!ossl_ffc_set_digest(ffc, gctx->mdname, gctx->mdprops))
 554             goto end;
 555     }
 556     if ((gctx->selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0) {
 557
 558          if (ossl_dsa_generate_ffc_parameters(dsa, gctx->gen_type,
 559                                               gctx->pbits, gctx->qbits,
 560                                               gencb) <= 0)
 561              goto end;
 562     }
 563     ossl_ffc_params_enable_flags(ffc, FFC_PARAM_FLAG_VALIDATE_LEGACY,
 564                                  gctx->gen_type == DSA_PARAMGEN_TYPE_FIPS_186_2);
 565     if ((gctx->selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0) {
 566         if (ffc->p == NULL
 567             || ffc->q == NULL
 568             || ffc->g == NULL)
 569             goto end;
 570         if (DSA_generate_key(dsa) <= 0)
 571             goto end;
 572     }
 573     ret = 1;
 574 end:
 575     if (ret <= 0) {
 576         DSA_free(dsa);
 577         dsa = NULL;
 578     }
 579     BN_GENCB_free(gencb);
 580     return dsa;
 581 }
 582
 583 static void dsa_gen_cleanup(void *genctx)
 584 {
 585     struct dsa_gen_ctx *gctx = genctx;
 586
 587     if (gctx == NULL)
 588         return;
 589
 590     OPENSSL_free(gctx->mdname);
 591     OPENSSL_free(gctx->mdprops);
 592     OPENSSL_clear_free(gctx->seed, gctx->seedlen);
 593     OPENSSL_free(gctx);
 594 }
 595
 596 void *dsa_load(const void *reference, size_t reference_sz)
 597 {
 598     DSA *dsa = NULL;
 599
 600     if (ossl_prov_is_running() && reference_sz == sizeof(dsa)) {
 601         /* The contents of the reference is the address to our object */
 602         dsa = *(DSA **)reference;
 603         /* We grabbed, so we detach it */
 604         *(DSA **)reference = NULL;
 605         return dsa;
 606     }
 607     return NULL;
 608 }
 609
 610 const OSSL_DISPATCH ossl_dsa_keymgmt_functions[] = {
 611     { OSSL_FUNC_KEYMGMT_NEW, (void (*)(void))dsa_newdata },
 612     { OSSL_FUNC_KEYMGMT_GEN_INIT, (void (*)(void))dsa_gen_init },
 613     { OSSL_FUNC_KEYMGMT_GEN_SET_TEMPLATE, (void (*)(void))dsa_gen_set_template },
 614     { OSSL_FUNC_KEYMGMT_GEN_SET_PARAMS, (void (*)(void))dsa_gen_set_params },
 615     { OSSL_FUNC_KEYMGMT_GEN_SETTABLE_PARAMS,
 616       (void (*)(void))dsa_gen_settable_params },
 617     { OSSL_FUNC_KEYMGMT_GEN, (void (*)(void))dsa_gen },
 618     { OSSL_FUNC_KEYMGMT_GEN_CLEANUP, (void (*)(void))dsa_gen_cleanup },
 619     { OSSL_FUNC_KEYMGMT_LOAD, (void (*)(void))dsa_load },
 620     { OSSL_FUNC_KEYMGMT_FREE, (void (*)(void))dsa_freedata },
 621     { OSSL_FUNC_KEYMGMT_GET_PARAMS, (void (*) (void))dsa_get_params },
 622     { OSSL_FUNC_KEYMGMT_GETTABLE_PARAMS, (void (*) (void))dsa_gettable_params },
 623     { OSSL_FUNC_KEYMGMT_HAS, (void (*)(void))dsa_has },
 624     { OSSL_FUNC_KEYMGMT_MATCH, (void (*)(void))dsa_match },
 625     { OSSL_FUNC_KEYMGMT_VALIDATE, (void (*)(void))dsa_validate },
 626     { OSSL_FUNC_KEYMGMT_IMPORT, (void (*)(void))dsa_import },
 627     { OSSL_FUNC_KEYMGMT_IMPORT_TYPES, (void (*)(void))dsa_import_types },
 628     { OSSL_FUNC_KEYMGMT_EXPORT, (void (*)(void))dsa_export },
 629     { OSSL_FUNC_KEYMGMT_EXPORT_TYPES, (void (*)(void))dsa_export_types },
 630     { 0, NULL }
 631 };