providers/implementations/keymgmt/rsa_kmgmt.c

   1 /*
   2  * Copyright 2019-2023 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  * RSA low level APIs are deprecated for public use, but still ok for
  12  * internal use.
  13  */
  14 #include "internal/deprecated.h"
  15
  16 #include <openssl/core_dispatch.h>
  17 #include <openssl/core_names.h>
  18 #include <openssl/bn.h>
  19 #include <openssl/err.h>
  20 #include <openssl/rsa.h>
  21 #include <openssl/evp.h>
  22 #include <openssl/proverr.h>
  23 #include "prov/implementations.h"
  24 #include "prov/providercommon.h"
  25 #include "prov/provider_ctx.h"
  26 #include "crypto/rsa.h"
  27 #include "crypto/cryptlib.h"
  28 #include "internal/param_build_set.h"
  29
  30 static OSSL_FUNC_keymgmt_new_fn rsa_newdata;
  31 static OSSL_FUNC_keymgmt_new_fn rsapss_newdata;
  32 static OSSL_FUNC_keymgmt_gen_init_fn rsa_gen_init;
  33 static OSSL_FUNC_keymgmt_gen_init_fn rsapss_gen_init;
  34 static OSSL_FUNC_keymgmt_gen_set_params_fn rsa_gen_set_params;
  35 static OSSL_FUNC_keymgmt_gen_settable_params_fn rsa_gen_settable_params;
  36 static OSSL_FUNC_keymgmt_gen_settable_params_fn rsapss_gen_settable_params;
  37 static OSSL_FUNC_keymgmt_gen_fn rsa_gen;
  38 static OSSL_FUNC_keymgmt_gen_cleanup_fn rsa_gen_cleanup;
  39 static OSSL_FUNC_keymgmt_load_fn rsa_load;
  40 static OSSL_FUNC_keymgmt_load_fn rsapss_load;
  41 static OSSL_FUNC_keymgmt_free_fn rsa_freedata;
  42 static OSSL_FUNC_keymgmt_get_params_fn rsa_get_params;
  43 static OSSL_FUNC_keymgmt_gettable_params_fn rsa_gettable_params;
  44 static OSSL_FUNC_keymgmt_has_fn rsa_has;
  45 static OSSL_FUNC_keymgmt_match_fn rsa_match;
  46 static OSSL_FUNC_keymgmt_validate_fn rsa_validate;
  47 static OSSL_FUNC_keymgmt_import_fn rsa_import;
  48 static OSSL_FUNC_keymgmt_import_types_fn rsa_import_types;
  49 static OSSL_FUNC_keymgmt_export_fn rsa_export;
  50 static OSSL_FUNC_keymgmt_export_types_fn rsa_export_types;
  51 static OSSL_FUNC_keymgmt_query_operation_name_fn rsa_query_operation_name;
  52 static OSSL_FUNC_keymgmt_dup_fn rsa_dup;
  53
  54 #define RSA_DEFAULT_MD "SHA256"
  55 #define RSA_PSS_DEFAULT_MD OSSL_DIGEST_NAME_SHA1
  56 #define RSA_POSSIBLE_SELECTIONS                                        \
  57     (OSSL_KEYMGMT_SELECT_KEYPAIR | OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS)
  58
  59 DEFINE_STACK_OF(BIGNUM)
  60 DEFINE_SPECIAL_STACK_OF_CONST(BIGNUM_const, BIGNUM)
  61
  62 static int pss_params_fromdata(RSA_PSS_PARAMS_30 *pss_params, int *defaults_set,
  63                                const OSSL_PARAM params[], int rsa_type,
  64                                OSSL_LIB_CTX *libctx)
  65 {
  66     if (!ossl_rsa_pss_params_30_fromdata(pss_params, defaults_set,
  67                                          params, libctx))
  68         return 0;
  69
  70     /* If not a PSS type RSA, sending us PSS parameters is wrong */
  71     if (rsa_type != RSA_FLAG_TYPE_RSASSAPSS
  72         && !ossl_rsa_pss_params_30_is_unrestricted(pss_params))
  73         return 0;
  74
  75     return 1;
  76 }
  77
  78 static void *rsa_newdata(void *provctx)
  79 {
  80     OSSL_LIB_CTX *libctx = PROV_LIBCTX_OF(provctx);
  81     RSA *rsa;
  82
  83     if (!ossl_prov_is_running())
  84         return NULL;
  85
  86     rsa = ossl_rsa_new_with_ctx(libctx);
  87     if (rsa != NULL) {
  88         RSA_clear_flags(rsa, RSA_FLAG_TYPE_MASK);
  89         RSA_set_flags(rsa, RSA_FLAG_TYPE_RSA);
  90     }
  91     return rsa;
  92 }
  93
  94 static void *rsapss_newdata(void *provctx)
  95 {
  96     OSSL_LIB_CTX *libctx = PROV_LIBCTX_OF(provctx);
  97     RSA *rsa;
  98
  99     if (!ossl_prov_is_running())
 100         return NULL;
 101
 102     rsa = ossl_rsa_new_with_ctx(libctx);
 103     if (rsa != NULL) {
 104         RSA_clear_flags(rsa, RSA_FLAG_TYPE_MASK);
 105         RSA_set_flags(rsa, RSA_FLAG_TYPE_RSASSAPSS);
 106     }
 107     return rsa;
 108 }
 109
 110 static void rsa_freedata(void *keydata)
 111 {
 112     RSA_free(keydata);
 113 }
 114
 115 static int rsa_has(const void *keydata, int selection)
 116 {
 117     const RSA *rsa = keydata;
 118     int ok = 1;
 119
 120     if (rsa == NULL || !ossl_prov_is_running())
 121         return 0;
 122     if ((selection & RSA_POSSIBLE_SELECTIONS) == 0)
 123         return 1; /* the selection is not missing */
 124
 125     /* OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS are always available even if empty */
 126     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
 127         ok = ok && (RSA_get0_n(rsa) != NULL);
 128     if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
 129         ok = ok && (RSA_get0_e(rsa) != NULL);
 130     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 131         ok = ok && (RSA_get0_d(rsa) != NULL);
 132     return ok;
 133 }
 134
 135 static int rsa_match(const void *keydata1, const void *keydata2, int selection)
 136 {
 137     const RSA *rsa1 = keydata1;
 138     const RSA *rsa2 = keydata2;
 139     int ok = 1;
 140
 141     if (!ossl_prov_is_running())
 142         return 0;
 143
 144     /* There is always an |e| */
 145     ok = ok && BN_cmp(RSA_get0_e(rsa1), RSA_get0_e(rsa2)) == 0;
 146     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0) {
 147         int key_checked = 0;
 148
 149         if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0) {
 150             const BIGNUM *pa = RSA_get0_n(rsa1);
 151             const BIGNUM *pb = RSA_get0_n(rsa2);
 152
 153             if (pa != NULL && pb != NULL) {
 154                 ok = ok && BN_cmp(pa, pb) == 0;
 155                 key_checked = 1;
 156             }
 157         }
 158         if (!key_checked
 159             && (selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0) {
 160             const BIGNUM *pa = RSA_get0_d(rsa1);
 161             const BIGNUM *pb = RSA_get0_d(rsa2);
 162
 163             if (pa != NULL && pb != NULL) {
 164                 ok = ok && BN_cmp(pa, pb) == 0;
 165                 key_checked = 1;
 166             }
 167         }
 168         ok = ok && key_checked;
 169     }
 170     return ok;
 171 }
 172
 173 static int rsa_import(void *keydata, int selection, const OSSL_PARAM params[])
 174 {
 175     RSA *rsa = keydata;
 176     int rsa_type;
 177     int ok = 1;
 178     int pss_defaults_set = 0;
 179
 180     if (!ossl_prov_is_running() || rsa == NULL)
 181         return 0;
 182
 183     if ((selection & RSA_POSSIBLE_SELECTIONS) == 0)
 184         return 0;
 185
 186     rsa_type = RSA_test_flags(rsa, RSA_FLAG_TYPE_MASK);
 187
 188     if ((selection & OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS) != 0)
 189         ok = ok && pss_params_fromdata(ossl_rsa_get0_pss_params_30(rsa),
 190                                        &pss_defaults_set,
 191                                        params, rsa_type,
 192                                        ossl_rsa_get0_libctx(rsa));
 193     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0) {
 194         int include_private =
 195             selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY ? 1 : 0;
 196
 197         ok = ok && ossl_rsa_fromdata(rsa, params, include_private);
 198     }
 199
 200     return ok;
 201 }
 202
 203 static int rsa_export(void *keydata, int selection,
 204                       OSSL_CALLBACK *param_callback, void *cbarg)
 205 {
 206     RSA *rsa = keydata;
 207     const RSA_PSS_PARAMS_30 *pss_params = ossl_rsa_get0_pss_params_30(rsa);
 208     OSSL_PARAM_BLD *tmpl;
 209     OSSL_PARAM *params = NULL;
 210     int ok = 1;
 211
 212     if (!ossl_prov_is_running() || rsa == NULL)
 213         return 0;
 214
 215     if ((selection & RSA_POSSIBLE_SELECTIONS) == 0)
 216         return 0;
 217
 218     tmpl = OSSL_PARAM_BLD_new();
 219     if (tmpl == NULL)
 220         return 0;
 221
 222     if ((selection & OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS) != 0)
 223         ok = ok && (ossl_rsa_pss_params_30_is_unrestricted(pss_params)
 224                     || ossl_rsa_pss_params_30_todata(pss_params, tmpl, NULL));
 225     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0) {
 226         int include_private =
 227             selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY ? 1 : 0;
 228
 229         ok = ok && ossl_rsa_todata(rsa, tmpl, NULL, include_private);
 230     }
 231
 232     if (!ok || (params = OSSL_PARAM_BLD_to_param(tmpl)) == NULL) {
 233         ok = 0;
 234         goto err;
 235     }
 236
 237     ok = param_callback(params, cbarg);
 238     OSSL_PARAM_free(params);
 239 err:
 240     OSSL_PARAM_BLD_free(tmpl);
 241     return ok;
 242 }
 243
 244 #ifdef FIPS_MODULE
 245 /* In fips mode there are no multi-primes. */
 246 # define RSA_KEY_MP_TYPES()                                                    \
 247 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR1, NULL, 0),                           \
 248 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR2, NULL, 0),                           \
 249 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT1, NULL, 0),                         \
 250 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT2, NULL, 0),                         \
 251 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT1, NULL, 0),
 252 #else
 253 /*
 254  * We allow up to 10 prime factors (starting with p, q).
 255  * NOTE: there is only 9 OSSL_PKEY_PARAM_RSA_COEFFICIENT
 256  */
 257 # define RSA_KEY_MP_TYPES()                                                    \
 258 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR1, NULL, 0),                           \
 259 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR2, NULL, 0),                           \
 260 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR3, NULL, 0),                           \
 261 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR4, NULL, 0),                           \
 262 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR5, NULL, 0),                           \
 263 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR6, NULL, 0),                           \
 264 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR7, NULL, 0),                           \
 265 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR8, NULL, 0),                           \
 266 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR9, NULL, 0),                           \
 267 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR10, NULL, 0),                          \
 268 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT1, NULL, 0),                         \
 269 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT2, NULL, 0),                         \
 270 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT3, NULL, 0),                         \
 271 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT4, NULL, 0),                         \
 272 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT5, NULL, 0),                         \
 273 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT6, NULL, 0),                         \
 274 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT7, NULL, 0),                         \
 275 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT8, NULL, 0),                         \
 276 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT9, NULL, 0),                         \
 277 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT10, NULL, 0),                        \
 278 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT1, NULL, 0),                      \
 279 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT2, NULL, 0),                      \
 280 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT3, NULL, 0),                      \
 281 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT4, NULL, 0),                      \
 282 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT5, NULL, 0),                      \
 283 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT6, NULL, 0),                      \
 284 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT7, NULL, 0),                      \
 285 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT8, NULL, 0),                      \
 286 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT9, NULL, 0),
 287 #endif
 288
 289 #define RSA_KEY_TYPES()                                                        \
 290 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_N, NULL, 0),                                 \
 291 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_E, NULL, 0),                                 \
 292 OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_D, NULL, 0),                                 \
 293 RSA_KEY_MP_TYPES()
 294
 295 /*
 296  * This provider can export everything in an RSA key, so we use the exact
 297  * same type description for export as for import.  Other providers might
 298  * choose to import full keys, but only export the public parts, and will
 299  * therefore have the importkey_types and importkey_types functions return
 300  * different arrays.
 301  */
 302 static const OSSL_PARAM rsa_key_types[] = {
 303     RSA_KEY_TYPES()
 304     OSSL_PARAM_END
 305 };
 306 /*
 307  * We lied about the amount of factors, exponents and coefficients, the
 308  * export and import functions can really deal with an infinite amount
 309  * of these numbers.  However, RSA keys with too many primes are futile,
 310  * so we at least pretend to have some limits.
 311  */
 312
 313 static const OSSL_PARAM *rsa_imexport_types(int selection)
 314 {
 315     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
 316         return rsa_key_types;
 317     return NULL;
 318 }
 319
 320 static const OSSL_PARAM *rsa_import_types(int selection)
 321 {
 322     return rsa_imexport_types(selection);
 323 }
 324
 325 static const OSSL_PARAM *rsa_export_types(int selection)
 326 {
 327     return rsa_imexport_types(selection);
 328 }
 329
 330 static int rsa_get_params(void *key, OSSL_PARAM params[])
 331 {
 332     RSA *rsa = key;
 333     const RSA_PSS_PARAMS_30 *pss_params = ossl_rsa_get0_pss_params_30(rsa);
 334     int rsa_type = RSA_test_flags(rsa, RSA_FLAG_TYPE_MASK);
 335     OSSL_PARAM *p;
 336     int empty = RSA_get0_n(rsa) == NULL;
 337
 338     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_BITS)) != NULL
 339         && (empty || !OSSL_PARAM_set_int(p, RSA_bits(rsa))))
 340         return 0;
 341     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_SECURITY_BITS)) != NULL
 342         && (empty || !OSSL_PARAM_set_int(p, RSA_security_bits(rsa))))
 343         return 0;
 344     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_MAX_SIZE)) != NULL
 345         && (empty || !OSSL_PARAM_set_int(p, RSA_size(rsa))))
 346         return 0;
 347
 348     /*
 349      * For restricted RSA-PSS keys, we ignore the default digest request.
 350      * With RSA-OAEP keys, this may need to be amended.
 351      */
 352     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_DEFAULT_DIGEST)) != NULL
 353         && (rsa_type != RSA_FLAG_TYPE_RSASSAPSS
 354             || ossl_rsa_pss_params_30_is_unrestricted(pss_params))) {
 355         if (!OSSL_PARAM_set_utf8_string(p, RSA_DEFAULT_MD))
 356             return 0;
 357     }
 358
 359     /*
 360      * For non-RSA-PSS keys, we ignore the mandatory digest request.
 361      * With RSA-OAEP keys, this may need to be amended.
 362      */
 363     if ((p = OSSL_PARAM_locate(params,
 364                                OSSL_PKEY_PARAM_MANDATORY_DIGEST)) != NULL
 365         && rsa_type == RSA_FLAG_TYPE_RSASSAPSS
 366         && !ossl_rsa_pss_params_30_is_unrestricted(pss_params)) {
 367         const char *mdname =
 368             ossl_rsa_oaeppss_nid2name(ossl_rsa_pss_params_30_hashalg(pss_params));
 369
 370         if (mdname == NULL || !OSSL_PARAM_set_utf8_string(p, mdname))
 371             return 0;
 372     }
 373     return (rsa_type != RSA_FLAG_TYPE_RSASSAPSS
 374             || ossl_rsa_pss_params_30_todata(pss_params, NULL, params))
 375         && ossl_rsa_todata(rsa, NULL, params, 1);
 376 }
 377
 378 static const OSSL_PARAM rsa_params[] = {
 379     OSSL_PARAM_int(OSSL_PKEY_PARAM_BITS, NULL),
 380     OSSL_PARAM_int(OSSL_PKEY_PARAM_SECURITY_BITS, NULL),
 381     OSSL_PARAM_int(OSSL_PKEY_PARAM_MAX_SIZE, NULL),
 382     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_DEFAULT_DIGEST, NULL, 0),
 383     RSA_KEY_TYPES()
 384     OSSL_PARAM_END
 385 };
 386
 387 static const OSSL_PARAM *rsa_gettable_params(void *provctx)
 388 {
 389     return rsa_params;
 390 }
 391
 392 static int rsa_validate(const void *keydata, int selection, int checktype)
 393 {
 394     const RSA *rsa = keydata;
 395     int ok = 1;
 396
 397     if (!ossl_prov_is_running())
 398         return 0;
 399
 400     if ((selection & RSA_POSSIBLE_SELECTIONS) == 0)
 401         return 1; /* nothing to validate */
 402
 403     /* If the whole key is selected, we do a pairwise validation */
 404     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR)
 405         == OSSL_KEYMGMT_SELECT_KEYPAIR) {
 406         ok = ok && ossl_rsa_validate_pairwise(rsa);
 407     } else {
 408         if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 409             ok = ok && ossl_rsa_validate_private(rsa);
 410         if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
 411             ok = ok && ossl_rsa_validate_public(rsa);
 412     }
 413     return ok;
 414 }
 415
 416 struct rsa_gen_ctx {
 417     OSSL_LIB_CTX *libctx;
 418     const char *propq;
 419
 420     int rsa_type;
 421
 422     size_t nbits;
 423     BIGNUM *pub_exp;
 424     size_t primes;
 425
 426     /* For PSS */
 427     RSA_PSS_PARAMS_30 pss_params;
 428     int pss_defaults_set;
 429
 430     /* For generation callback */
 431     OSSL_CALLBACK *cb;
 432     void *cbarg;
 433
 434 #if defined(FIPS_MODULE) && !defined(OPENSSL_NO_ACVP_TESTS)
 435     /* ACVP test parameters */
 436     OSSL_PARAM *acvp_test_params;
 437 #endif
 438 };
 439
 440 static int rsa_gencb(int p, int n, BN_GENCB *cb)
 441 {
 442     struct rsa_gen_ctx *gctx = BN_GENCB_get_arg(cb);
 443     OSSL_PARAM params[] = { OSSL_PARAM_END, OSSL_PARAM_END, OSSL_PARAM_END };
 444
 445     params[0] = OSSL_PARAM_construct_int(OSSL_GEN_PARAM_POTENTIAL, &p);
 446     params[1] = OSSL_PARAM_construct_int(OSSL_GEN_PARAM_ITERATION, &n);
 447     return gctx->cb(params, gctx->cbarg);
 448 }
 449
 450 static void *gen_init(void *provctx, int selection, int rsa_type,
 451                       const OSSL_PARAM params[])
 452 {
 453     OSSL_LIB_CTX *libctx = PROV_LIBCTX_OF(provctx);
 454     struct rsa_gen_ctx *gctx = NULL;
 455
 456     if (!ossl_prov_is_running())
 457         return NULL;
 458
 459     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) == 0)
 460         return NULL;
 461
 462     if ((gctx = OPENSSL_zalloc(sizeof(*gctx))) != NULL) {
 463         gctx->libctx = libctx;
 464         if ((gctx->pub_exp = BN_new()) == NULL
 465             || !BN_set_word(gctx->pub_exp, RSA_F4)) {
 466             goto err;
 467         }
 468         gctx->nbits = 2048;
 469         gctx->primes = RSA_DEFAULT_PRIME_NUM;
 470         gctx->rsa_type = rsa_type;
 471     } else {
 472         goto err;
 473     }
 474
 475     if (!rsa_gen_set_params(gctx, params))
 476         goto err;
 477     return gctx;
 478
 479 err:
 480     if (gctx != NULL)
 481         BN_free(gctx->pub_exp);
 482     OPENSSL_free(gctx);
 483     return NULL;
 484 }
 485
 486 static void *rsa_gen_init(void *provctx, int selection,
 487                           const OSSL_PARAM params[])
 488 {
 489     return gen_init(provctx, selection, RSA_FLAG_TYPE_RSA, params);
 490 }
 491
 492 static void *rsapss_gen_init(void *provctx, int selection,
 493                              const OSSL_PARAM params[])
 494 {
 495     return gen_init(provctx, selection, RSA_FLAG_TYPE_RSASSAPSS, params);
 496 }
 497
 498 /*
 499  * This function is common for all RSA sub-types, to detect possible
 500  * misuse, such as PSS parameters being passed when a plain RSA key
 501  * is generated.
 502  */
 503 static int rsa_gen_set_params(void *genctx, const OSSL_PARAM params[])
 504 {
 505     struct rsa_gen_ctx *gctx = genctx;
 506     const OSSL_PARAM *p;
 507
 508     if (params == NULL)
 509         return 1;
 510
 511     if ((p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_BITS)) != NULL) {
 512         if (!OSSL_PARAM_get_size_t(p, &gctx->nbits))
 513             return 0;
 514         if (gctx->nbits < RSA_MIN_MODULUS_BITS) {
 515             ERR_raise(ERR_LIB_PROV, PROV_R_KEY_SIZE_TOO_SMALL);
 516             return 0;
 517         }
 518     }
 519     if ((p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_PRIMES)) != NULL
 520         && !OSSL_PARAM_get_size_t(p, &gctx->primes))
 521         return 0;
 522     if ((p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_E)) != NULL
 523         && !OSSL_PARAM_get_BN(p, &gctx->pub_exp))
 524         return 0;
 525     /* Only attempt to get PSS parameters when generating an RSA-PSS key */
 526     if (gctx->rsa_type == RSA_FLAG_TYPE_RSASSAPSS
 527         && !pss_params_fromdata(&gctx->pss_params, &gctx->pss_defaults_set, params,
 528                                 gctx->rsa_type, gctx->libctx))
 529         return 0;
 530 #if defined(FIPS_MODULE) && !defined(OPENSSL_NO_ACVP_TESTS)
 531     /* Any ACVP test related parameters are copied into a params[] */
 532     if (!ossl_rsa_acvp_test_gen_params_new(&gctx->acvp_test_params, params))
 533         return 0;
 534 #endif
 535     return 1;
 536 }
 537
 538 #define rsa_gen_basic                                           \
 539     OSSL_PARAM_size_t(OSSL_PKEY_PARAM_RSA_BITS, NULL),          \
 540     OSSL_PARAM_size_t(OSSL_PKEY_PARAM_RSA_PRIMES, NULL),        \
 541     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_E, NULL, 0)
 542
 543 /*
 544  * The following must be kept in sync with ossl_rsa_pss_params_30_fromdata()
 545  * in crypto/rsa/rsa_backend.c
 546  */
 547 #define rsa_gen_pss                                                     \
 548     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_RSA_DIGEST, NULL, 0),        \
 549     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_RSA_DIGEST_PROPS, NULL, 0),  \
 550     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_RSA_MASKGENFUNC, NULL, 0),   \
 551     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_RSA_MGF1_DIGEST, NULL, 0),   \
 552     OSSL_PARAM_int(OSSL_PKEY_PARAM_RSA_PSS_SALTLEN, NULL)
 553
 554 static const OSSL_PARAM *rsa_gen_settable_params(ossl_unused void *genctx,
 555                                                  ossl_unused void *provctx)
 556 {
 557     static OSSL_PARAM settable[] = {
 558         rsa_gen_basic,
 559         OSSL_PARAM_END
 560     };
 561
 562     return settable;
 563 }
 564
 565 static const OSSL_PARAM *rsapss_gen_settable_params(ossl_unused void *genctx,
 566                                                     ossl_unused void *provctx)
 567 {
 568     static OSSL_PARAM settable[] = {
 569         rsa_gen_basic,
 570         rsa_gen_pss,
 571         OSSL_PARAM_END
 572     };
 573
 574     return settable;
 575 }
 576
 577 static void *rsa_gen(void *genctx, OSSL_CALLBACK *osslcb, void *cbarg)
 578 {
 579     struct rsa_gen_ctx *gctx = genctx;
 580     RSA *rsa = NULL, *rsa_tmp = NULL;
 581     BN_GENCB *gencb = NULL;
 582
 583     if (!ossl_prov_is_running() || gctx == NULL)
 584         return NULL;
 585
 586     switch (gctx->rsa_type) {
 587     case RSA_FLAG_TYPE_RSA:
 588         /* For plain RSA keys, PSS parameters must not be set */
 589         if (!ossl_rsa_pss_params_30_is_unrestricted(&gctx->pss_params))
 590             goto err;
 591         break;
 592     case RSA_FLAG_TYPE_RSASSAPSS:
 593         /*
 594          * For plain RSA-PSS keys, PSS parameters may be set but don't have
 595          * to, so not check.
 596          */
 597         break;
 598     default:
 599         /* Unsupported RSA key sub-type... */
 600         return NULL;
 601     }
 602
 603     if ((rsa_tmp = ossl_rsa_new_with_ctx(gctx->libctx)) == NULL)
 604         return NULL;
 605
 606     gctx->cb = osslcb;
 607     gctx->cbarg = cbarg;
 608     gencb = BN_GENCB_new();
 609     if (gencb != NULL)
 610         BN_GENCB_set(gencb, rsa_gencb, genctx);
 611
 612 #if defined(FIPS_MODULE) && !defined(OPENSSL_NO_ACVP_TESTS)
 613     if (gctx->acvp_test_params != NULL) {
 614         if (!ossl_rsa_acvp_test_set_params(rsa_tmp, gctx->acvp_test_params))
 615             goto err;
 616     }
 617 #endif
 618
 619     if (!RSA_generate_multi_prime_key(rsa_tmp,
 620                                       (int)gctx->nbits, (int)gctx->primes,
 621                                       gctx->pub_exp, gencb))
 622         goto err;
 623
 624     if (!ossl_rsa_pss_params_30_copy(ossl_rsa_get0_pss_params_30(rsa_tmp),
 625                                      &gctx->pss_params))
 626         goto err;
 627
 628     RSA_clear_flags(rsa_tmp, RSA_FLAG_TYPE_MASK);
 629     RSA_set_flags(rsa_tmp, gctx->rsa_type);
 630
 631     rsa = rsa_tmp;
 632     rsa_tmp = NULL;
 633  err:
 634     BN_GENCB_free(gencb);
 635     RSA_free(rsa_tmp);
 636     return rsa;
 637 }
 638
 639 static void rsa_gen_cleanup(void *genctx)
 640 {
 641     struct rsa_gen_ctx *gctx = genctx;
 642
 643     if (gctx == NULL)
 644         return;
 645 #if defined(FIPS_MODULE) && !defined(OPENSSL_NO_ACVP_TESTS)
 646     ossl_rsa_acvp_test_gen_params_free(gctx->acvp_test_params);
 647     gctx->acvp_test_params = NULL;
 648 #endif
 649     BN_clear_free(gctx->pub_exp);
 650     OPENSSL_free(gctx);
 651 }
 652
 653 static void *common_load(const void *reference, size_t reference_sz,
 654                          int expected_rsa_type)
 655 {
 656     RSA *rsa = NULL;
 657
 658     if (ossl_prov_is_running() && reference_sz == sizeof(rsa)) {
 659         /* The contents of the reference is the address to our object */
 660         rsa = *(RSA **)reference;
 661
 662         if (RSA_test_flags(rsa, RSA_FLAG_TYPE_MASK) != expected_rsa_type)
 663             return NULL;
 664
 665         /* We grabbed, so we detach it */
 666         *(RSA **)reference = NULL;
 667         return rsa;
 668     }
 669     return NULL;
 670 }
 671
 672 static void *rsa_load(const void *reference, size_t reference_sz)
 673 {
 674     return common_load(reference, reference_sz, RSA_FLAG_TYPE_RSA);
 675 }
 676
 677 static void *rsapss_load(const void *reference, size_t reference_sz)
 678 {
 679     return common_load(reference, reference_sz, RSA_FLAG_TYPE_RSASSAPSS);
 680 }
 681
 682 static void *rsa_dup(const void *keydata_from, int selection)
 683 {
 684     if (ossl_prov_is_running()
 685         /* do not allow creating empty keys by duplication */
 686         && (selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
 687         return ossl_rsa_dup(keydata_from, selection);
 688     return NULL;
 689 }
 690
 691 /* For any RSA key, we use the "RSA" algorithms regardless of sub-type. */
 692 static const char *rsa_query_operation_name(int operation_id)
 693 {
 694     return "RSA";
 695 }
 696
 697 const OSSL_DISPATCH ossl_rsa_keymgmt_functions[] = {
 698     { OSSL_FUNC_KEYMGMT_NEW, (void (*)(void))rsa_newdata },
 699     { OSSL_FUNC_KEYMGMT_GEN_INIT, (void (*)(void))rsa_gen_init },
 700     { OSSL_FUNC_KEYMGMT_GEN_SET_PARAMS,
 701       (void (*)(void))rsa_gen_set_params },
 702     { OSSL_FUNC_KEYMGMT_GEN_SETTABLE_PARAMS,
 703       (void (*)(void))rsa_gen_settable_params },
 704     { OSSL_FUNC_KEYMGMT_GEN, (void (*)(void))rsa_gen },
 705     { OSSL_FUNC_KEYMGMT_GEN_CLEANUP, (void (*)(void))rsa_gen_cleanup },
 706     { OSSL_FUNC_KEYMGMT_LOAD, (void (*)(void))rsa_load },
 707     { OSSL_FUNC_KEYMGMT_FREE, (void (*)(void))rsa_freedata },
 708     { OSSL_FUNC_KEYMGMT_GET_PARAMS, (void (*) (void))rsa_get_params },
 709     { OSSL_FUNC_KEYMGMT_GETTABLE_PARAMS, (void (*) (void))rsa_gettable_params },
 710     { OSSL_FUNC_KEYMGMT_HAS, (void (*)(void))rsa_has },
 711     { OSSL_FUNC_KEYMGMT_MATCH, (void (*)(void))rsa_match },
 712     { OSSL_FUNC_KEYMGMT_VALIDATE, (void (*)(void))rsa_validate },
 713     { OSSL_FUNC_KEYMGMT_IMPORT, (void (*)(void))rsa_import },
 714     { OSSL_FUNC_KEYMGMT_IMPORT_TYPES, (void (*)(void))rsa_import_types },
 715     { OSSL_FUNC_KEYMGMT_EXPORT, (void (*)(void))rsa_export },
 716     { OSSL_FUNC_KEYMGMT_EXPORT_TYPES, (void (*)(void))rsa_export_types },
 717     { OSSL_FUNC_KEYMGMT_DUP, (void (*)(void))rsa_dup },
 718     OSSL_DISPATCH_END
 719 };
 720
 721 const OSSL_DISPATCH ossl_rsapss_keymgmt_functions[] = {
 722     { OSSL_FUNC_KEYMGMT_NEW, (void (*)(void))rsapss_newdata },
 723     { OSSL_FUNC_KEYMGMT_GEN_INIT, (void (*)(void))rsapss_gen_init },
 724     { OSSL_FUNC_KEYMGMT_GEN_SET_PARAMS, (void (*)(void))rsa_gen_set_params },
 725     { OSSL_FUNC_KEYMGMT_GEN_SETTABLE_PARAMS,
 726       (void (*)(void))rsapss_gen_settable_params },
 727     { OSSL_FUNC_KEYMGMT_GEN, (void (*)(void))rsa_gen },
 728     { OSSL_FUNC_KEYMGMT_GEN_CLEANUP, (void (*)(void))rsa_gen_cleanup },
 729     { OSSL_FUNC_KEYMGMT_LOAD, (void (*)(void))rsapss_load },
 730     { OSSL_FUNC_KEYMGMT_FREE, (void (*)(void))rsa_freedata },
 731     { OSSL_FUNC_KEYMGMT_GET_PARAMS, (void (*) (void))rsa_get_params },
 732     { OSSL_FUNC_KEYMGMT_GETTABLE_PARAMS, (void (*) (void))rsa_gettable_params },
 733     { OSSL_FUNC_KEYMGMT_HAS, (void (*)(void))rsa_has },
 734     { OSSL_FUNC_KEYMGMT_MATCH, (void (*)(void))rsa_match },
 735     { OSSL_FUNC_KEYMGMT_VALIDATE, (void (*)(void))rsa_validate },
 736     { OSSL_FUNC_KEYMGMT_IMPORT, (void (*)(void))rsa_import },
 737     { OSSL_FUNC_KEYMGMT_IMPORT_TYPES, (void (*)(void))rsa_import_types },
 738     { OSSL_FUNC_KEYMGMT_EXPORT, (void (*)(void))rsa_export },
 739     { OSSL_FUNC_KEYMGMT_EXPORT_TYPES, (void (*)(void))rsa_export_types },
 740     { OSSL_FUNC_KEYMGMT_QUERY_OPERATION_NAME,
 741       (void (*)(void))rsa_query_operation_name },
 742     { OSSL_FUNC_KEYMGMT_DUP, (void (*)(void))rsa_dup },
 743     OSSL_DISPATCH_END
 744 };