providers/implementations/encode_decode/encode_key2any.c

   1 /*
   2  * Copyright 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  * Low level APIs are deprecated for public use, but still ok for internal use.
  12  */
  13 #include "internal/deprecated.h"
  14
  15 #include <openssl/core.h>
  16 #include <openssl/core_dispatch.h>
  17 #include <openssl/core_names.h>
  18 #include <openssl/crypto.h>
  19 #include <openssl/params.h>
  20 #include <openssl/asn1.h>
  21 #include <openssl/err.h>
  22 #include <openssl/pem.h>
  23 #include <openssl/x509.h>
  24 #include <openssl/pkcs12.h>      /* PKCS8_encrypt() */
  25 #include <openssl/dh.h>
  26 #include <openssl/dsa.h>
  27 #include <openssl/ec.h>
  28 #include "internal/passphrase.h"
  29 #include "internal/cryptlib.h"
  30 #include "crypto/ecx.h"
  31 #include "crypto/rsa.h"
  32 #include "prov/implementations.h"
  33 #include "prov/providercommonerr.h"
  34 #include "prov/bio.h"
  35 #include "prov/provider_ctx.h"
  36 #include "prov/der_rsa.h"
  37 #include "endecoder_local.h"
  38
  39 struct key2any_ctx_st {
  40     PROV_CTX *provctx;
  41
  42     /* Set to 1 if intending to encrypt/decrypt, otherwise 0 */
  43     int cipher_intent;
  44
  45     EVP_CIPHER *cipher;
  46
  47     struct ossl_passphrase_data_st pwdata;
  48 };
  49
  50 typedef int check_key_type_fn(const void *key, int nid);
  51 typedef int key_to_paramstring_fn(const void *key, int nid,
  52                                   void **str, int *strtype);
  53 typedef int key_to_der_fn(BIO *out, const void *key, int key_nid,
  54                           key_to_paramstring_fn *p2s, i2d_of_void *k2d,
  55                           struct key2any_ctx_st *ctx);
  56 typedef int write_bio_of_void_fn(BIO *bp, const void *x);
  57
  58 static PKCS8_PRIV_KEY_INFO *key_to_p8info(const void *key, int key_nid,
  59                                           void *params, int params_type,
  60                                           i2d_of_void *k2d)
  61 {
  62     /* der, derlen store the key DER output and its length */
  63     unsigned char *der = NULL;
  64     int derlen;
  65     /* The final PKCS#8 info */
  66     PKCS8_PRIV_KEY_INFO *p8info = NULL;
  67
  68
  69     if ((p8info = PKCS8_PRIV_KEY_INFO_new()) == NULL
  70         || (derlen = k2d(key, &der)) <= 0
  71         || !PKCS8_pkey_set0(p8info, OBJ_nid2obj(key_nid), 0,
  72                             params_type, params, der, derlen)) {
  73         ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
  74         PKCS8_PRIV_KEY_INFO_free(p8info);
  75         OPENSSL_free(der);
  76         p8info = NULL;
  77     }
  78
  79     return p8info;
  80 }
  81
  82 static X509_SIG *p8info_to_encp8(PKCS8_PRIV_KEY_INFO *p8info,
  83                                  struct key2any_ctx_st *ctx)
  84 {
  85     X509_SIG *p8 = NULL;
  86     char kstr[PEM_BUFSIZE];
  87     size_t klen = 0;
  88
  89     if (ctx->cipher == NULL)
  90         return NULL;
  91
  92     if (!ossl_pw_get_passphrase(kstr, sizeof(kstr), &klen, NULL, 1,
  93                                 &ctx->pwdata)) {
  94         ERR_raise(ERR_LIB_PROV, PROV_R_READ_KEY);
  95         return NULL;
  96     }
  97     /* First argument == -1 means "standard" */
  98     p8 = PKCS8_encrypt(-1, ctx->cipher, kstr, klen, NULL, 0, 0, p8info);
  99     OPENSSL_cleanse(kstr, klen);
 100     return p8;
 101 }
 102
 103 static X509_SIG *key_to_encp8(const void *key, int key_nid,
 104                               void *params, int params_type,
 105                               i2d_of_void *k2d, struct key2any_ctx_st *ctx)
 106 {
 107     PKCS8_PRIV_KEY_INFO *p8info =
 108         key_to_p8info(key, key_nid, params, params_type, k2d);
 109     X509_SIG *p8 = p8info_to_encp8(p8info, ctx);
 110
 111     PKCS8_PRIV_KEY_INFO_free(p8info);
 112     return p8;
 113 }
 114
 115 static X509_PUBKEY *key_to_pubkey(const void *key, int key_nid,
 116                                   void *params, int params_type,
 117                                   i2d_of_void k2d)
 118 {
 119     /* der, derlen store the key DER output and its length */
 120     unsigned char *der = NULL;
 121     int derlen;
 122     /* The final X509_PUBKEY */
 123     X509_PUBKEY *xpk = NULL;
 124
 125
 126     if ((xpk = X509_PUBKEY_new()) == NULL
 127         || (derlen = k2d(key, &der)) <= 0
 128         || !X509_PUBKEY_set0_param(xpk, OBJ_nid2obj(key_nid),
 129                                    params_type, params, der, derlen)) {
 130         ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
 131         X509_PUBKEY_free(xpk);
 132         OPENSSL_free(der);
 133         xpk = NULL;
 134     }
 135
 136     return xpk;
 137 }
 138
 139 static int key_to_der_pkcs8_bio(BIO *out, const void *key, int key_nid,
 140                                 key_to_paramstring_fn *p2s, i2d_of_void *k2d,
 141                                 struct key2any_ctx_st *ctx)
 142 {
 143     int ret = 0;
 144     void *str = NULL;
 145     int strtype = V_ASN1_UNDEF;
 146
 147     if (p2s != NULL && !p2s(key, key_nid, &str, &strtype))
 148         return 0;
 149
 150     if (ctx->cipher_intent) {
 151         X509_SIG *p8 = key_to_encp8(key, key_nid, str, strtype, k2d, ctx);
 152
 153         if (p8 != NULL)
 154             ret = i2d_PKCS8_bio(out, p8);
 155
 156         X509_SIG_free(p8);
 157     } else {
 158         PKCS8_PRIV_KEY_INFO *p8info =
 159             key_to_p8info(key, key_nid, str, strtype, k2d);
 160
 161         if (p8info != NULL)
 162             ret = i2d_PKCS8_PRIV_KEY_INFO_bio(out, p8info);
 163
 164         PKCS8_PRIV_KEY_INFO_free(p8info);
 165     }
 166
 167     return ret;
 168 }
 169
 170 static int key_to_pem_pkcs8_bio(BIO *out, const void *key, int key_nid,
 171                                 key_to_paramstring_fn *p2s, i2d_of_void *k2d,
 172                                 struct key2any_ctx_st *ctx)
 173 {
 174     int ret = 0;
 175     void *str = NULL;
 176     int strtype = V_ASN1_UNDEF;
 177
 178     if (p2s != NULL && !p2s(key, key_nid, &str, &strtype))
 179         return 0;
 180
 181     if (ctx->cipher_intent) {
 182         X509_SIG *p8 = key_to_encp8(key, key_nid, str, strtype, k2d, ctx);
 183
 184         if (p8 != NULL)
 185             ret = PEM_write_bio_PKCS8(out, p8);
 186
 187         X509_SIG_free(p8);
 188     } else {
 189         PKCS8_PRIV_KEY_INFO *p8info =
 190             key_to_p8info(key, key_nid, str, strtype, k2d);
 191
 192         if (p8info != NULL)
 193             ret = PEM_write_bio_PKCS8_PRIV_KEY_INFO(out, p8info);
 194
 195         PKCS8_PRIV_KEY_INFO_free(p8info);
 196     }
 197
 198     return ret;
 199 }
 200
 201 static int key_to_der_pubkey_bio(BIO *out, const void *key, int key_nid,
 202                                  key_to_paramstring_fn *p2s, i2d_of_void *k2d,
 203                                  struct key2any_ctx_st *ctx)
 204 {
 205     int ret = 0;
 206     void *str = NULL;
 207     int strtype = V_ASN1_UNDEF;
 208     X509_PUBKEY *xpk = NULL;
 209
 210     if (p2s != NULL && !p2s(key, key_nid, &str, &strtype))
 211         return 0;
 212
 213     xpk = key_to_pubkey(key, key_nid, str, strtype, k2d);
 214
 215     if (xpk != NULL)
 216         ret = i2d_X509_PUBKEY_bio(out, xpk);
 217
 218     /* Also frees |str| */
 219     X509_PUBKEY_free(xpk);
 220     return ret;
 221 }
 222
 223 static int key_to_pem_pubkey_bio(BIO *out, const void *key, int key_nid,
 224                                  key_to_paramstring_fn *p2s, i2d_of_void *k2d,
 225                                  struct key2any_ctx_st *ctx)
 226 {
 227     int ret = 0;
 228     void *str = NULL;
 229     int strtype = V_ASN1_UNDEF;
 230     X509_PUBKEY *xpk = NULL;
 231
 232     if (p2s != NULL && !p2s(key, key_nid, &str, &strtype))
 233         return 0;
 234
 235     xpk = key_to_pubkey(key, key_nid, str, strtype, k2d);
 236
 237     if (xpk != NULL)
 238         ret = PEM_write_bio_X509_PUBKEY(out, xpk);
 239
 240     /* Also frees |str| */
 241     X509_PUBKEY_free(xpk);
 242     return ret;
 243 }
 244
 245 #define der_output_type         "DER"
 246 #define pem_output_type         "PEM"
 247
 248 /* ---------------------------------------------------------------------- */
 249
 250 #ifndef OPENSSL_NO_DH
 251 static int prepare_dh_params(const void *dh, int nid,
 252                              void **pstr, int *pstrtype)
 253 {
 254     ASN1_STRING *params = ASN1_STRING_new();
 255
 256     if (params == NULL) {
 257         ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
 258         return 0;
 259     }
 260
 261     if (nid == EVP_PKEY_DHX)
 262         params->length = i2d_DHxparams(dh, &params->data);
 263     else
 264         params->length = i2d_DHparams(dh, &params->data);
 265
 266     if (params->length <= 0) {
 267         ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
 268         ASN1_STRING_free(params);
 269         return 0;
 270     }
 271     params->type = V_ASN1_SEQUENCE;
 272
 273     *pstr = params;
 274     *pstrtype = V_ASN1_SEQUENCE;
 275     return 1;
 276 }
 277
 278 static int dh_pub_to_der(const void *dh, unsigned char **pder)
 279 {
 280     const BIGNUM *bn = NULL;
 281     ASN1_INTEGER *pub_key = NULL;
 282     int ret;
 283
 284     if ((bn = DH_get0_pub_key(dh)) == NULL) {
 285         ERR_raise(ERR_LIB_PROV, PROV_R_NOT_A_PUBLIC_KEY);
 286         return 0;
 287     }
 288     if ((pub_key = BN_to_ASN1_INTEGER(bn, NULL)) == NULL) {
 289         ERR_raise(ERR_LIB_PROV, PROV_R_BN_ERROR);
 290         return 0;
 291     }
 292
 293     ret = i2d_ASN1_INTEGER(pub_key, pder);
 294
 295     ASN1_STRING_clear_free(pub_key);
 296     return ret;
 297 }
 298
 299 static int dh_priv_to_der(const void *dh, unsigned char **pder)
 300 {
 301     const BIGNUM *bn = NULL;
 302     ASN1_INTEGER *priv_key = NULL;
 303     int ret;
 304
 305     if ((bn = DH_get0_priv_key(dh)) == NULL) {
 306         ERR_raise(ERR_LIB_PROV, PROV_R_NOT_A_PRIVATE_KEY);
 307         return 0;
 308     }
 309     if ((priv_key = BN_to_ASN1_INTEGER(bn, NULL)) == NULL) {
 310         ERR_raise(ERR_LIB_PROV, PROV_R_BN_ERROR);
 311         return 0;
 312     }
 313
 314     ret = i2d_ASN1_INTEGER(priv_key, pder);
 315
 316     ASN1_STRING_clear_free(priv_key);
 317     return ret;
 318 }
 319
 320 static int dh_params_to_der_bio(BIO *out, const void *key)
 321 {
 322     return i2d_DHparams_bio(out, key);
 323 }
 324
 325 static int dh_params_to_pem_bio(BIO *out, const void *key)
 326 {
 327     return PEM_write_bio_DHparams(out, key);
 328 }
 329
 330 static int dh_check_key_type(const void *key, int expected_type)
 331 {
 332     int type =
 333         DH_test_flags(key, DH_FLAG_TYPE_DHX) ? EVP_PKEY_DHX : EVP_PKEY_DH;
 334
 335     return type == expected_type;
 336 }
 337
 338 # define dh_evp_type            EVP_PKEY_DH
 339 # define dhx_evp_type           EVP_PKEY_DHX
 340 # define dh_input_type          "DH"
 341 # define dhx_input_type         "DHX"
 342 #endif
 343
 344 /* ---------------------------------------------------------------------- */
 345
 346 #ifndef OPENSSL_NO_DSA
 347 static int prepare_some_dsa_params(const void *dsa, int nid,
 348                                    void **pstr, int *pstrtype)
 349 {
 350     ASN1_STRING *params = ASN1_STRING_new();
 351
 352     if (params == NULL) {
 353         ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
 354         return 0;
 355     }
 356
 357     params->length = i2d_DSAparams(dsa, &params->data);
 358
 359     if (params->length <= 0) {
 360         ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
 361         ASN1_STRING_free(params);
 362         return 0;
 363     }
 364
 365     *pstrtype = V_ASN1_SEQUENCE;
 366     *pstr = params;
 367     return 1;
 368 }
 369
 370 static int prepare_all_dsa_params(const void *dsa, int nid,
 371                                   void **pstr, int *pstrtype)
 372 {
 373     const BIGNUM *p = DSA_get0_p(dsa);
 374     const BIGNUM *q = DSA_get0_q(dsa);
 375     const BIGNUM *g = DSA_get0_g(dsa);
 376
 377     if (p != NULL && q != NULL && g != NULL)
 378         return prepare_some_dsa_params(dsa, nid, pstr, pstrtype);
 379
 380     *pstr = NULL;
 381     *pstrtype = V_ASN1_UNDEF;
 382     return 1;
 383 }
 384
 385 static int prepare_dsa_params(const void *dsa, int nid,
 386                               void **pstr, int *pstrtype)
 387 {
 388     /*
 389      * TODO(v3.0) implement setting save_parameters, see dsa_pub_encode()
 390      * in crypto/dsa/dsa_ameth.c
 391      */
 392     int save_parameters = 1;
 393
 394     return save_parameters
 395         ?  prepare_all_dsa_params(dsa, nid, pstr, pstrtype)
 396         :  prepare_some_dsa_params(dsa, nid, pstr, pstrtype);
 397 }
 398
 399 static int dsa_pub_to_der(const void *dsa, unsigned char **pder)
 400 {
 401     const BIGNUM *bn = NULL;
 402     ASN1_INTEGER *pub_key = NULL;
 403     int ret;
 404
 405     if ((bn = DSA_get0_pub_key(dsa)) == NULL) {
 406         ERR_raise(ERR_LIB_PROV, PROV_R_NOT_A_PUBLIC_KEY);
 407         return 0;
 408     }
 409     if ((pub_key = BN_to_ASN1_INTEGER(bn, NULL)) == NULL) {
 410         ERR_raise(ERR_LIB_PROV, PROV_R_BN_ERROR);
 411         return 0;
 412     }
 413
 414     ret = i2d_ASN1_INTEGER(pub_key, pder);
 415
 416     ASN1_STRING_clear_free(pub_key);
 417     return ret;
 418 }
 419
 420 static int dsa_priv_to_der(const void *dsa, unsigned char **pder)
 421 {
 422     const BIGNUM *bn = NULL;
 423     ASN1_INTEGER *priv_key = NULL;
 424     int ret;
 425
 426     if ((bn = DSA_get0_priv_key(dsa)) == NULL) {
 427         ERR_raise(ERR_LIB_PROV, PROV_R_NOT_A_PRIVATE_KEY);
 428         return 0;
 429     }
 430     if ((priv_key = BN_to_ASN1_INTEGER(bn, NULL)) == NULL) {
 431         ERR_raise(ERR_LIB_PROV, PROV_R_BN_ERROR);
 432         return 0;
 433     }
 434
 435     ret = i2d_ASN1_INTEGER(priv_key, pder);
 436
 437     ASN1_STRING_clear_free(priv_key);
 438     return ret;
 439 }
 440
 441 static int dsa_params_to_der_bio(BIO *out, const void *key)
 442 {
 443     return i2d_DSAparams_bio(out, key);
 444 }
 445
 446 static int dsa_params_to_pem_bio(BIO *out, const void *key)
 447 {
 448     return PEM_write_bio_DSAparams(out, key);
 449 }
 450
 451 # define dsa_check_key_type     NULL
 452 # define dsa_evp_type           EVP_PKEY_DSA
 453 # define dsa_input_type         "DSA"
 454 #endif
 455
 456 /* ---------------------------------------------------------------------- */
 457
 458 #ifndef OPENSSL_NO_EC
 459 static int prepare_ec_explicit_params(const void *eckey,
 460                                       void **pstr, int *pstrtype)
 461 {
 462     ASN1_STRING *params = ASN1_STRING_new();
 463
 464     if (params == NULL) {
 465         ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
 466         return 0;
 467     }
 468
 469     params->length = i2d_ECParameters(eckey, &params->data);
 470     if (params->length <= 0) {
 471         ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
 472         ASN1_STRING_free(params);
 473         return 0;
 474     }
 475
 476     *pstrtype = V_ASN1_SEQUENCE;
 477     *pstr = params;
 478     return 1;
 479 }
 480
 481 static int prepare_ec_params(const void *eckey, int nid,
 482                              void **pstr, int *pstrtype)
 483 {
 484     int curve_nid;
 485     const EC_GROUP *group = EC_KEY_get0_group(eckey);
 486     ASN1_OBJECT *params = NULL;
 487
 488     if (group == NULL)
 489         return 0;
 490     curve_nid = EC_GROUP_get_curve_name(group);
 491     if (curve_nid != NID_undef) {
 492         params = OBJ_nid2obj(curve_nid);
 493         if (params == NULL)
 494             return 0;
 495     }
 496
 497     if (curve_nid != NID_undef
 498         && (EC_GROUP_get_asn1_flag(group) & OPENSSL_EC_NAMED_CURVE)) {
 499         if (OBJ_length(params) == 0) {
 500             /* Some curves might not have an associated OID */
 501             ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_OID);
 502             ASN1_OBJECT_free(params);
 503             return 0;
 504         }
 505         *pstr = params;
 506         *pstrtype = V_ASN1_OBJECT;
 507         return 1;
 508     } else {
 509         return prepare_ec_explicit_params(eckey, pstr, pstrtype);
 510     }
 511 }
 512
 513 static int ec_params_to_der_bio(BIO *out, const void *eckey)
 514 {
 515     return i2d_ECPKParameters_bio(out, EC_KEY_get0_group(eckey));
 516 }
 517
 518 static int ec_params_to_pem_bio(BIO *out, const void *eckey)
 519 {
 520     return PEM_write_bio_ECPKParameters(out, EC_KEY_get0_group(eckey));
 521 }
 522
 523 static int ec_pub_to_der(const void *eckey, unsigned char **pder)
 524 {
 525     return i2o_ECPublicKey(eckey, pder);
 526 }
 527
 528 static int ec_priv_to_der(const void *veckey, unsigned char **pder)
 529 {
 530     EC_KEY *eckey = (EC_KEY *)veckey;
 531     unsigned int old_flags;
 532     int ret = 0;
 533
 534     /*
 535      * For PKCS8 the curve name appears in the PKCS8_PRIV_KEY_INFO object
 536      * as the pkeyalg->parameter field. (For a named curve this is an OID)
 537      * The pkey field is an octet string that holds the encoded
 538      * ECPrivateKey SEQUENCE with the optional parameters field omitted.
 539      * We omit this by setting the EC_PKEY_NO_PARAMETERS flag.
 540      */
 541     old_flags = EC_KEY_get_enc_flags(eckey); /* save old flags */
 542     EC_KEY_set_enc_flags(eckey, old_flags | EC_PKEY_NO_PARAMETERS);
 543     ret = i2d_ECPrivateKey(eckey, pder);
 544     EC_KEY_set_enc_flags(eckey, old_flags); /* restore old flags */
 545     return ret; /* return the length of the der encoded data */
 546 }
 547
 548 # define ec_check_key_type      NULL
 549 # define ec_evp_type            EVP_PKEY_EC
 550 # define ec_input_type          "EC"
 551 #endif
 552
 553 /* ---------------------------------------------------------------------- */
 554
 555 #ifndef OPENSSL_NO_EC
 556 # define prepare_ecx_params NULL
 557
 558 static int ecx_pub_to_der(const void *vecxkey, unsigned char **pder)
 559 {
 560     const ECX_KEY *ecxkey = vecxkey;
 561     unsigned char *keyblob;
 562
 563     if (ecxkey == NULL) {
 564         ERR_raise(ERR_LIB_PROV, ERR_R_PASSED_NULL_PARAMETER);
 565         return 0;
 566     }
 567
 568     keyblob = OPENSSL_memdup(ecxkey->pubkey, ecxkey->keylen);
 569     if (keyblob == NULL) {
 570         ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
 571         return 0;
 572     }
 573
 574     *pder = keyblob;
 575     return ecxkey->keylen;
 576 }
 577
 578 static int ecx_priv_to_der(const void *vecxkey, unsigned char **pder)
 579 {
 580     const ECX_KEY *ecxkey = vecxkey;
 581     ASN1_OCTET_STRING oct;
 582     int keybloblen;
 583
 584     if (ecxkey == NULL || ecxkey->privkey == NULL) {
 585         ERR_raise(ERR_LIB_PROV, ERR_R_PASSED_NULL_PARAMETER);
 586         return 0;
 587     }
 588
 589     oct.data = ecxkey->privkey;
 590     oct.length = ecxkey->keylen;
 591     oct.flags = 0;
 592
 593     keybloblen = i2d_ASN1_OCTET_STRING(&oct, pder);
 594     if (keybloblen < 0) {
 595         ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
 596         return 0;
 597     }
 598
 599     return keybloblen;
 600 }
 601
 602 # define ecx_params_to_der_bio  NULL
 603 # define ecx_params_to_pem_bio  NULL
 604 # define ecx_check_key_type     NULL
 605
 606 # define ed25519_evp_type       EVP_PKEY_ED25519
 607 # define ed448_evp_type         EVP_PKEY_ED448
 608 # define x25519_evp_type        EVP_PKEY_X25519
 609 # define x448_evp_type          EVP_PKEY_X448
 610 # define ed25519_input_type     "ED25519"
 611 # define ed448_input_type       "ED448"
 612 # define x25519_input_type      "X25519"
 613 # define x448_input_type        "X448"
 614 #endif
 615
 616 /* ---------------------------------------------------------------------- */
 617
 618 /*
 619  * Helper functions to prepare RSA-PSS params for encoding.  We would
 620  * have simply written the whole AlgorithmIdentifier, but existing libcrypto
 621  * functionality doesn't allow that.
 622  */
 623
 624 static int prepare_rsa_params(const void *rsa, int nid,
 625                               void **pstr, int *pstrtype)
 626 {
 627     const RSA_PSS_PARAMS_30 *pss = ossl_rsa_get0_pss_params_30((RSA *)rsa);
 628
 629     *pstr = NULL;
 630
 631     switch (RSA_test_flags(rsa, RSA_FLAG_TYPE_MASK)) {
 632     case RSA_FLAG_TYPE_RSA:
 633         /* If plain RSA, the parameters shall be NULL */
 634         *pstrtype = V_ASN1_NULL;
 635         return 1;
 636     case RSA_FLAG_TYPE_RSASSAPSS:
 637         if (ossl_rsa_pss_params_30_is_unrestricted(pss)) {
 638             *pstrtype = V_ASN1_UNDEF;
 639             return 1;
 640         } else {
 641             ASN1_STRING *astr = NULL;
 642             WPACKET pkt;
 643             unsigned char *str = NULL;
 644             size_t str_sz = 0;
 645             int i;
 646
 647             for (i = 0; i < 2; i++) {
 648                 switch (i) {
 649                 case 0:
 650                     if (!WPACKET_init_null_der(&pkt))
 651                         goto err;
 652                     break;
 653                 case 1:
 654                     if ((str = OPENSSL_malloc(str_sz)) == NULL
 655                         || !WPACKET_init_der(&pkt, str, str_sz)) {
 656                         goto err;
 657                     }
 658                     break;
 659                 }
 660                 if (!ossl_DER_w_RSASSA_PSS_params(&pkt, -1, pss)
 661                     || !WPACKET_finish(&pkt)
 662                     || !WPACKET_get_total_written(&pkt, &str_sz))
 663                     goto err;
 664                 WPACKET_cleanup(&pkt);
 665
 666                 /*
 667                  * If no PSS parameters are going to be written, there's no
 668                  * point going for another iteration.
 669                  * This saves us from getting |str| allocated just to have it
 670                  * immediately de-allocated.
 671                  */
 672                 if (str_sz == 0)
 673                     break;
 674             }
 675
 676             if ((astr = ASN1_STRING_new()) == NULL)
 677                 goto err;
 678             *pstrtype = V_ASN1_SEQUENCE;
 679             ASN1_STRING_set0(astr, str, (int)str_sz);
 680             *pstr = astr;
 681
 682             return 1;
 683          err:
 684             OPENSSL_free(str);
 685             return 0;
 686         }
 687     }
 688
 689     /* Currently unsupported RSA key type */
 690     return 0;
 691 }
 692
 693 #define rsa_params_to_der_bio   NULL
 694 #define rsa_params_to_pem_bio   NULL
 695 #define rsa_priv_to_der         (i2d_of_void *)i2d_RSAPrivateKey
 696 #define rsa_pub_to_der          (i2d_of_void *)i2d_RSAPublicKey
 697
 698 static int rsa_check_key_type(const void *rsa, int expected_type)
 699 {
 700     switch (RSA_test_flags(rsa, RSA_FLAG_TYPE_MASK)) {
 701     case RSA_FLAG_TYPE_RSA:
 702         return expected_type == EVP_PKEY_RSA;
 703     case RSA_FLAG_TYPE_RSASSAPSS:
 704         return expected_type == EVP_PKEY_RSA_PSS;
 705     }
 706
 707     /* Currently unsupported RSA key type */
 708     return EVP_PKEY_NONE;
 709 }
 710
 711 #define rsa_evp_type            EVP_PKEY_RSA
 712 #define rsapss_evp_type         EVP_PKEY_RSA_PSS
 713 #define rsa_input_type          "RSA"
 714 #define rsapss_input_type       "RSA-PSS"
 715
 716 /* ---------------------------------------------------------------------- */
 717
 718 static OSSL_FUNC_decoder_newctx_fn key2any_newctx;
 719 static OSSL_FUNC_decoder_freectx_fn key2any_freectx;
 720 static OSSL_FUNC_decoder_gettable_params_fn key2any_gettable_params;
 721
 722 static void *key2any_newctx(void *provctx)
 723 {
 724     struct key2any_ctx_st *ctx = OPENSSL_zalloc(sizeof(*ctx));
 725
 726     if (ctx != NULL)
 727         ctx->provctx = provctx;
 728
 729     return ctx;
 730 }
 731
 732 static void key2any_freectx(void *vctx)
 733 {
 734     struct key2any_ctx_st *ctx = vctx;
 735
 736     ossl_pw_clear_passphrase_data(&ctx->pwdata);
 737     EVP_CIPHER_free(ctx->cipher);
 738     OPENSSL_free(ctx);
 739 }
 740
 741 static const OSSL_PARAM *key2any_gettable_params(void *provctx)
 742 {
 743     static const OSSL_PARAM gettables[] = {
 744         { OSSL_ENCODER_PARAM_OUTPUT_TYPE, OSSL_PARAM_UTF8_PTR, NULL, 0, 0 },
 745         OSSL_PARAM_END,
 746     };
 747
 748     return gettables;
 749 }
 750
 751 static int key2any_get_params(OSSL_PARAM params[], const char *input_type,
 752                               const char *output_type)
 753 {
 754     OSSL_PARAM *p;
 755
 756     p = OSSL_PARAM_locate(params, OSSL_ENCODER_PARAM_INPUT_TYPE);
 757     if (p != NULL && !OSSL_PARAM_set_utf8_ptr(p, input_type))
 758         return 0;
 759
 760     p = OSSL_PARAM_locate(params, OSSL_ENCODER_PARAM_OUTPUT_TYPE);
 761     if (p != NULL && !OSSL_PARAM_set_utf8_ptr(p, output_type))
 762         return 0;
 763
 764     return 1;
 765 }
 766
 767 static const OSSL_PARAM *key2any_settable_ctx_params(ossl_unused void *provctx)
 768 {
 769     static const OSSL_PARAM settables[] = {
 770         OSSL_PARAM_utf8_string(OSSL_ENCODER_PARAM_CIPHER, NULL, 0),
 771         OSSL_PARAM_utf8_string(OSSL_ENCODER_PARAM_PROPERTIES, NULL, 0),
 772         OSSL_PARAM_END,
 773     };
 774
 775     return settables;
 776 }
 777
 778 static int key2any_set_ctx_params(void *vctx, const OSSL_PARAM params[])
 779 {
 780     struct key2any_ctx_st *ctx = vctx;
 781     OPENSSL_CTX *libctx = ossl_prov_ctx_get0_library_context(ctx->provctx);
 782     const OSSL_PARAM *cipherp =
 783         OSSL_PARAM_locate_const(params, OSSL_ENCODER_PARAM_CIPHER);
 784     const OSSL_PARAM *propsp =
 785         OSSL_PARAM_locate_const(params, OSSL_ENCODER_PARAM_PROPERTIES);
 786
 787     if (cipherp != NULL) {
 788         const char *ciphername = NULL;
 789         const char *props = NULL;
 790
 791         if (!OSSL_PARAM_get_utf8_string_ptr(cipherp, &ciphername))
 792             return 0;
 793         if (propsp != NULL && !OSSL_PARAM_get_utf8_string_ptr(propsp, &props))
 794             return 0;
 795
 796         EVP_CIPHER_free(ctx->cipher);
 797         ctx->cipher_intent = ciphername != NULL;
 798         if (ciphername != NULL
 799             && ((ctx->cipher =
 800                  EVP_CIPHER_fetch(libctx, ciphername, props)) == NULL))
 801             return 0;
 802     }
 803     return 1;
 804 }
 805
 806 static int key2any_encode(struct key2any_ctx_st *ctx, OSSL_CORE_BIO *cout,
 807                           const void *key, int type,
 808                           check_key_type_fn *checker,
 809                           key_to_der_fn *writer,
 810                           OSSL_PASSPHRASE_CALLBACK *cb, void *cbarg,
 811                           key_to_paramstring_fn *key2paramstring,
 812                           i2d_of_void *key2der)
 813 {
 814     int ret = 0;
 815
 816     if (key == NULL) {
 817         ERR_raise(ERR_LIB_PROV, ERR_R_PASSED_NULL_PARAMETER);
 818     } else if (checker == NULL || checker(key, type)) {
 819         BIO *out = bio_new_from_core_bio(ctx->provctx, cout);
 820
 821         if (out != NULL
 822             && writer != NULL
 823             && ossl_pw_set_ossl_passphrase_cb(&ctx->pwdata, cb, cbarg))
 824             ret = writer(out, key, type, key2paramstring, key2der, ctx);
 825
 826         BIO_free(out);
 827     } else {
 828         ERR_raise(ERR_LIB_PROV, ERR_R_PASSED_INVALID_ARGUMENT);
 829     }
 830     return ret;
 831 }
 832
 833 static int key2any_encode_params(struct key2any_ctx_st *ctx,
 834                                  OSSL_CORE_BIO *cout,
 835                                  const void *key, int type,
 836                                  check_key_type_fn *checker,
 837                                  write_bio_of_void_fn *writer)
 838 {
 839     int ret = 0;
 840
 841     if (key == NULL) {
 842         ERR_raise(ERR_LIB_PROV, ERR_R_PASSED_NULL_PARAMETER);
 843     } else if (checker == NULL || checker(key, type)) {
 844         BIO *out = bio_new_from_core_bio(ctx->provctx, cout);
 845
 846         if (out != NULL && writer != NULL)
 847             ret = writer(out, key);
 848
 849         BIO_free(out);
 850     } else {
 851         ERR_raise(ERR_LIB_PROV, ERR_R_PASSED_INVALID_ARGUMENT);
 852     }
 853
 854     return ret;
 855 }
 856
 857 #define MAKE_ENCODER(impl, type, evp_type, output)                          \
 858     static OSSL_FUNC_encoder_get_params_fn                                  \
 859     impl##2##output##_get_params;                                           \
 860     static OSSL_FUNC_encoder_import_object_fn                               \
 861     impl##2##output##_import_object;                                        \
 862     static OSSL_FUNC_encoder_free_object_fn                                 \
 863     impl##2##output##_free_object;                                          \
 864     static OSSL_FUNC_encoder_encode_fn impl##2##output##_encode;            \
 865                                                                             \
 866     static int impl##2##output##_get_params(OSSL_PARAM params[])            \
 867     {                                                                       \
 868         return key2any_get_params(params, impl##_input_type,                \
 869                                   output##_output_type);                    \
 870     }                                                                       \
 871     static void *                                                           \
 872     impl##2##output##_import_object(void *vctx, int selection,              \
 873                                     const OSSL_PARAM params[])              \
 874     {                                                                       \
 875         struct key2any_ctx_st *ctx = vctx;                                  \
 876         return ossl_prov_import_key(ossl_##impl##_keymgmt_functions,        \
 877                                     ctx->provctx, selection, params);       \
 878     }                                                                       \
 879     static void impl##2##output##_free_object(void *key)                    \
 880     {                                                                       \
 881         ossl_prov_free_key(ossl_##impl##_keymgmt_functions, key);           \
 882     }                                                                       \
 883     static int                                                              \
 884     impl##2##output##_encode(void *ctx, OSSL_CORE_BIO *cout,                \
 885                              const void *key,                               \
 886                              const OSSL_PARAM key_abstract[],               \
 887                              int selection,                                 \
 888                              OSSL_PASSPHRASE_CALLBACK *cb, void *cbarg)     \
 889     {                                                                       \
 890         /* We don't deal with abstract objects */                           \
 891         if (key_abstract != NULL) {                                         \
 892             ERR_raise(ERR_LIB_PROV, ERR_R_PASSED_INVALID_ARGUMENT);         \
 893             return 0;                                                       \
 894         }                                                                   \
 895         if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)             \
 896             return key2any_encode(ctx, cout, key, impl##_evp_type,          \
 897                                   type##_check_key_type,                    \
 898                                   key_to_##output##_pkcs8_bio,              \
 899                                   cb, cbarg,                                \
 900                                   prepare_##type##_params,                  \
 901                                   type##_priv_to_der);                      \
 902         if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)              \
 903             return key2any_encode(ctx, cout, key, impl##_evp_type,          \
 904                                   type##_check_key_type,                    \
 905                                   key_to_##output##_pubkey_bio,             \
 906                                   cb, cbarg,                                \
 907                                   prepare_##type##_params,                  \
 908                                   type##_pub_to_der);                       \
 909         if ((selection & OSSL_KEYMGMT_SELECT_ALL_PARAMETERS) != 0)          \
 910             return key2any_encode_params(ctx, cout, key,                    \
 911                                          impl##_evp_type,                   \
 912                                          type##_check_key_type,             \
 913                                          type##_params_to_##output##_bio);  \
 914                                                                             \
 915         ERR_raise(ERR_LIB_PROV, ERR_R_PASSED_INVALID_ARGUMENT);             \
 916         return 0;                                                           \
 917     }                                                                       \
 918     const OSSL_DISPATCH ossl_##impl##_to_##output##_encoder_functions[] = { \
 919         { OSSL_FUNC_ENCODER_NEWCTX,                                         \
 920           (void (*)(void))key2any_newctx },                                 \
 921         { OSSL_FUNC_ENCODER_FREECTX,                                        \
 922           (void (*)(void))key2any_freectx },                                \
 923         { OSSL_FUNC_ENCODER_GETTABLE_PARAMS,                                \
 924           (void (*)(void))key2any_gettable_params },                        \
 925         { OSSL_FUNC_ENCODER_GET_PARAMS,                                     \
 926           (void (*)(void))impl##2##output##_get_params },                   \
 927         { OSSL_FUNC_ENCODER_SETTABLE_CTX_PARAMS,                            \
 928           (void (*)(void))key2any_settable_ctx_params },                    \
 929         { OSSL_FUNC_ENCODER_SET_CTX_PARAMS,                                 \
 930           (void (*)(void))key2any_set_ctx_params },                         \
 931         { OSSL_FUNC_ENCODER_IMPORT_OBJECT,                                  \
 932           (void (*)(void))impl##2##output##_import_object },                \
 933         { OSSL_FUNC_ENCODER_FREE_OBJECT,                                    \
 934           (void (*)(void))impl##2##output##_free_object },                  \
 935         { OSSL_FUNC_ENCODER_ENCODE,                                         \
 936           (void (*)(void))impl##2##output##_encode },                       \
 937         { 0, NULL }                                                         \
 938     }
 939
 940 #ifndef OPENSSL_NO_DH
 941 MAKE_ENCODER(dh, dh, EVP_PKEY_DH, der);
 942 MAKE_ENCODER(dh, dh, EVP_PKEY_DH, pem);
 943 MAKE_ENCODER(dhx, dh, EVP_PKEY_DH, der);
 944 MAKE_ENCODER(dhx, dh, EVP_PKEY_DH, pem);
 945 #endif
 946 #ifndef OPENSSL_NO_DSA
 947 MAKE_ENCODER(dsa, dsa, EVP_PKEY_DSA, der);
 948 MAKE_ENCODER(dsa, dsa, EVP_PKEY_DSA, pem);
 949 #endif
 950 #ifndef OPENSSL_NO_EC
 951 MAKE_ENCODER(ec, ec, EVP_PKEY_EC, der);
 952 MAKE_ENCODER(ec, ec, EVP_PKEY_EC, pem);
 953 MAKE_ENCODER(ed25519, ecx, EVP_PKEY_ED25519, der);
 954 MAKE_ENCODER(ed25519, ecx, EVP_PKEY_ED25519, pem);
 955 MAKE_ENCODER(ed448, ecx, EVP_PKEY_ED448, der);
 956 MAKE_ENCODER(ed448, ecx, EVP_PKEY_ED448, pem);
 957 MAKE_ENCODER(x25519, ecx, EVP_PKEY_X25519, der);
 958 MAKE_ENCODER(x25519, ecx, EVP_PKEY_X25519, pem);
 959 MAKE_ENCODER(x448, ecx, EVP_PKEY_ED448, der);
 960 MAKE_ENCODER(x448, ecx, EVP_PKEY_ED448, pem);
 961 #endif
 962 MAKE_ENCODER(rsa, rsa, EVP_PKEY_RSA, der);
 963 MAKE_ENCODER(rsa, rsa, EVP_PKEY_RSA, pem);
 964 MAKE_ENCODER(rsapss, rsa, EVP_PKEY_RSA, der);
 965 MAKE_ENCODER(rsapss, rsa, EVP_PKEY_RSA, pem);