providers/implementations/asymciphers/rsa_enc.c

   1 /*
   2  * Copyright 2019 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/crypto.h>
  17 #include <openssl/evp.h>
  18 #include <openssl/core_numbers.h>
  19 #include <openssl/core_names.h>
  20 #include <openssl/rsa.h>
  21 #include <openssl/params.h>
  22 #include <openssl/err.h>
  23 /* Just for SSL_MAX_MASTER_KEY_LENGTH */
  24 #include <openssl/ssl.h>
  25 #include "internal/constant_time.h"
  26 #include "internal/sizes.h"
  27 #include "crypto/rsa.h"
  28 #include "prov/providercommonerr.h"
  29 #include "prov/provider_ctx.h"
  30 #include "prov/implementations.h"
  31
  32 #include <stdlib.h>
  33
  34 static OSSL_OP_asym_cipher_newctx_fn rsa_newctx;
  35 static OSSL_OP_asym_cipher_encrypt_init_fn rsa_init;
  36 static OSSL_OP_asym_cipher_encrypt_fn rsa_encrypt;
  37 static OSSL_OP_asym_cipher_decrypt_init_fn rsa_init;
  38 static OSSL_OP_asym_cipher_decrypt_fn rsa_decrypt;
  39 static OSSL_OP_asym_cipher_freectx_fn rsa_freectx;
  40 static OSSL_OP_asym_cipher_dupctx_fn rsa_dupctx;
  41 static OSSL_OP_asym_cipher_get_ctx_params_fn rsa_get_ctx_params;
  42 static OSSL_OP_asym_cipher_gettable_ctx_params_fn rsa_gettable_ctx_params;
  43 static OSSL_OP_asym_cipher_set_ctx_params_fn rsa_set_ctx_params;
  44 static OSSL_OP_asym_cipher_settable_ctx_params_fn rsa_settable_ctx_params;
  45
  46 static OSSL_ITEM padding_item[] = {
  47     { RSA_PKCS1_PADDING,        "pkcs1"  },
  48     { RSA_SSLV23_PADDING,       "sslv23" },
  49     { RSA_NO_PADDING,           "none"   },
  50     { RSA_PKCS1_OAEP_PADDING,   "oaep"   }, /* Correct spelling first */
  51     { RSA_PKCS1_OAEP_PADDING,   "oeap"   },
  52     { RSA_X931_PADDING,         "x931"   },
  53     { RSA_PKCS1_PSS_PADDING,    "pss"    },
  54     { 0,                        NULL     }
  55 };
  56
  57 /*
  58  * What's passed as an actual key is defined by the KEYMGMT interface.
  59  * We happen to know that our KEYMGMT simply passes RSA structures, so
  60  * we use that here too.
  61  */
  62
  63 typedef struct {
  64     OPENSSL_CTX *libctx;
  65     RSA *rsa;
  66     int pad_mode;
  67     /* OAEP message digest */
  68     EVP_MD *oaep_md;
  69     /* message digest for MGF1 */
  70     EVP_MD *mgf1_md;
  71     /* OAEP label */
  72     unsigned char *oaep_label;
  73     size_t oaep_labellen;
  74     /* TLS padding */
  75     unsigned int client_version;
  76     unsigned int alt_version;
  77 } PROV_RSA_CTX;
  78
  79 static void *rsa_newctx(void *provctx)
  80 {
  81     PROV_RSA_CTX *prsactx =  OPENSSL_zalloc(sizeof(PROV_RSA_CTX));
  82
  83     if (prsactx == NULL)
  84         return NULL;
  85     prsactx->libctx = PROV_LIBRARY_CONTEXT_OF(provctx);
  86
  87     return prsactx;
  88 }
  89
  90 static int rsa_init(void *vprsactx, void *vrsa)
  91 {
  92     PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
  93
  94     if (prsactx == NULL || vrsa == NULL || !RSA_up_ref(vrsa))
  95         return 0;
  96     RSA_free(prsactx->rsa);
  97     prsactx->rsa = vrsa;
  98     prsactx->pad_mode = RSA_PKCS1_PADDING;
  99     return 1;
 100 }
 101
 102 static int rsa_encrypt(void *vprsactx, unsigned char *out, size_t *outlen,
 103                        size_t outsize, const unsigned char *in, size_t inlen)
 104 {
 105     PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
 106     int ret;
 107
 108     if (out == NULL) {
 109         size_t len = RSA_size(prsactx->rsa);
 110
 111         if (len == 0) {
 112             ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY);
 113             return 0;
 114         }
 115         *outlen = len;
 116         return 1;
 117     }
 118
 119     if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
 120         int rsasize = RSA_size(prsactx->rsa);
 121         unsigned char *tbuf;
 122
 123         if ((tbuf = OPENSSL_malloc(rsasize)) == NULL) {
 124             PROVerr(0, ERR_R_MALLOC_FAILURE);
 125             return 0;
 126         }
 127         if (prsactx->oaep_md == NULL) {
 128             OPENSSL_free(tbuf);
 129             prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, "SHA-1", NULL);
 130             PROVerr(0, ERR_R_INTERNAL_ERROR);
 131             return 0;
 132         }
 133         ret = RSA_padding_add_PKCS1_OAEP_mgf1(tbuf, rsasize, in, inlen,
 134                                               prsactx->oaep_label,
 135                                               prsactx->oaep_labellen,
 136                                               prsactx->oaep_md,
 137                                               prsactx->mgf1_md);
 138
 139         if (!ret) {
 140             OPENSSL_free(tbuf);
 141             return 0;
 142         }
 143         ret = RSA_public_encrypt(rsasize, tbuf, out, prsactx->rsa,
 144                                  RSA_NO_PADDING);
 145         OPENSSL_free(tbuf);
 146     } else {
 147         ret = RSA_public_encrypt(inlen, in, out, prsactx->rsa,
 148                                  prsactx->pad_mode);
 149     }
 150     /* A ret value of 0 is not an error */
 151     if (ret < 0)
 152         return ret;
 153     *outlen = ret;
 154     return 1;
 155 }
 156
 157 static int rsa_decrypt(void *vprsactx, unsigned char *out, size_t *outlen,
 158                        size_t outsize, const unsigned char *in, size_t inlen)
 159 {
 160     PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
 161     int ret;
 162     size_t len = RSA_size(prsactx->rsa);
 163
 164     if (prsactx->pad_mode == RSA_PKCS1_WITH_TLS_PADDING) {
 165         if (out == NULL) {
 166             *outlen = SSL_MAX_MASTER_KEY_LENGTH;
 167             return 1;
 168         }
 169         if (outsize < SSL_MAX_MASTER_KEY_LENGTH) {
 170             ERR_raise(ERR_LIB_PROV, PROV_R_BAD_LENGTH);
 171             return 0;
 172         }
 173     } else {
 174         if (out == NULL) {
 175             if (len == 0) {
 176                 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY);
 177                 return 0;
 178             }
 179             *outlen = len;
 180             return 1;
 181         }
 182
 183         if (outsize < len) {
 184             ERR_raise(ERR_LIB_PROV, PROV_R_BAD_LENGTH);
 185             return 0;
 186         }
 187     }
 188
 189     if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING
 190             || prsactx->pad_mode == RSA_PKCS1_WITH_TLS_PADDING) {
 191         unsigned char *tbuf;
 192
 193         if ((tbuf = OPENSSL_malloc(len)) == NULL) {
 194             PROVerr(0, ERR_R_MALLOC_FAILURE);
 195             return 0;
 196         }
 197         ret = RSA_private_decrypt(inlen, in, tbuf, prsactx->rsa,
 198                                   RSA_NO_PADDING);
 199         /*
 200          * With no padding then, on success ret should be len, otherwise an
 201          * error occurred (non-constant time)
 202          */
 203         if (ret != (int)len) {
 204             OPENSSL_free(tbuf);
 205             ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_DECRYPT);
 206             return 0;
 207         }
 208         if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
 209             if (prsactx->oaep_md == NULL) {
 210                 prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, "SHA-1", NULL);
 211                 if (prsactx->oaep_md == NULL) {
 212                     PROVerr(0, ERR_R_INTERNAL_ERROR);
 213                     return 0;
 214                 }
 215             }
 216             ret = RSA_padding_check_PKCS1_OAEP_mgf1(out, outsize, tbuf,
 217                                                     len, len,
 218                                                     prsactx->oaep_label,
 219                                                     prsactx->oaep_labellen,
 220                                                     prsactx->oaep_md,
 221                                                     prsactx->mgf1_md);
 222         } else {
 223             /* RSA_PKCS1_WITH_TLS_PADDING */
 224             if (prsactx->client_version <= 0) {
 225                 ERR_raise(ERR_LIB_PROV, PROV_R_BAD_TLS_CLIENT_VERSION);
 226                 return 0;
 227             }
 228             ret = rsa_padding_check_PKCS1_type_2_TLS(out, outsize,
 229                                                      tbuf, len,
 230                                                      prsactx->client_version,
 231                                                      prsactx->alt_version);
 232         }
 233         OPENSSL_free(tbuf);
 234     } else {
 235         ret = RSA_private_decrypt(inlen, in, out, prsactx->rsa,
 236                                   prsactx->pad_mode);
 237     }
 238     *outlen = constant_time_select_s(constant_time_msb_s(ret), *outlen, ret);
 239     ret = constant_time_select_int(constant_time_msb(ret), 0, 1);
 240     return ret;
 241 }
 242
 243 static void rsa_freectx(void *vprsactx)
 244 {
 245     PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
 246
 247     RSA_free(prsactx->rsa);
 248
 249     EVP_MD_free(prsactx->oaep_md);
 250     EVP_MD_free(prsactx->mgf1_md);
 251
 252     OPENSSL_free(prsactx);
 253 }
 254
 255 static void *rsa_dupctx(void *vprsactx)
 256 {
 257     PROV_RSA_CTX *srcctx = (PROV_RSA_CTX *)vprsactx;
 258     PROV_RSA_CTX *dstctx;
 259
 260     dstctx = OPENSSL_zalloc(sizeof(*srcctx));
 261     if (dstctx == NULL)
 262         return NULL;
 263
 264     *dstctx = *srcctx;
 265     if (dstctx->rsa != NULL && !RSA_up_ref(dstctx->rsa)) {
 266         OPENSSL_free(dstctx);
 267         return NULL;
 268     }
 269
 270     if (dstctx->oaep_md != NULL && !EVP_MD_up_ref(dstctx->oaep_md)) {
 271         RSA_free(dstctx->rsa);
 272         OPENSSL_free(dstctx);
 273         return NULL;
 274     }
 275
 276     if (dstctx->mgf1_md != NULL && !EVP_MD_up_ref(dstctx->mgf1_md)) {
 277         RSA_free(dstctx->rsa);
 278         EVP_MD_free(dstctx->oaep_md);
 279         OPENSSL_free(dstctx);
 280         return NULL;
 281     }
 282
 283     return dstctx;
 284 }
 285
 286 static int rsa_get_ctx_params(void *vprsactx, OSSL_PARAM *params)
 287 {
 288     PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
 289     OSSL_PARAM *p;
 290
 291     if (prsactx == NULL || params == NULL)
 292         return 0;
 293
 294     p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_PAD_MODE);
 295     if (p != NULL)
 296         switch (p->data_type) {
 297         case OSSL_PARAM_INTEGER: /* Support for legacy pad mode number */
 298             if (!OSSL_PARAM_set_int(p, prsactx->pad_mode))
 299                 return 0;
 300             break;
 301         case OSSL_PARAM_UTF8_STRING:
 302             {
 303                 int i;
 304                 const char *word = NULL;
 305
 306                 for (i = 0; padding_item[i].id != 0; i++) {
 307                     if (prsactx->pad_mode == (int)padding_item[i].id) {
 308                         word = padding_item[i].ptr;
 309                         break;
 310                     }
 311                 }
 312
 313                 if (word != NULL) {
 314                     if (!OSSL_PARAM_set_utf8_string(p, word))
 315                         return 0;
 316                 } else {
 317                     ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
 318                 }
 319             }
 320             break;
 321         default:
 322             return 0;
 323         }
 324
 325     p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST);
 326     if (p != NULL && !OSSL_PARAM_set_utf8_string(p, prsactx->oaep_md == NULL
 327                                                     ? ""
 328                                                     : EVP_MD_name(prsactx->oaep_md)))
 329         return 0;
 330
 331     p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST);
 332     if (p != NULL) {
 333         EVP_MD *mgf1_md = prsactx->mgf1_md == NULL ? prsactx->oaep_md
 334                                                    : prsactx->mgf1_md;
 335
 336         if (!OSSL_PARAM_set_utf8_string(p, mgf1_md == NULL
 337                                            ? ""
 338                                            : EVP_MD_name(mgf1_md)))
 339         return 0;
 340     }
 341
 342     p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL);
 343     if (p != NULL && !OSSL_PARAM_set_octet_ptr(p, prsactx->oaep_label, 0))
 344         return 0;
 345
 346     p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL_LEN);
 347     if (p != NULL && !OSSL_PARAM_set_size_t(p, prsactx->oaep_labellen))
 348         return 0;
 349
 350     p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION);
 351     if (p != NULL && !OSSL_PARAM_set_uint(p, prsactx->client_version))
 352         return 0;
 353
 354     p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION);
 355     if (p != NULL && !OSSL_PARAM_set_uint(p, prsactx->alt_version))
 356         return 0;
 357
 358     return 1;
 359 }
 360
 361 static const OSSL_PARAM known_gettable_ctx_params[] = {
 362     OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST, NULL, 0),
 363     OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_PAD_MODE, NULL, 0),
 364     OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST, NULL, 0),
 365     OSSL_PARAM_DEFN(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL, OSSL_PARAM_OCTET_PTR,
 366                     NULL, 0),
 367     OSSL_PARAM_size_t(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL_LEN, NULL),
 368     OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION, NULL),
 369     OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION, NULL),
 370     OSSL_PARAM_END
 371 };
 372
 373 static const OSSL_PARAM *rsa_gettable_ctx_params(void)
 374 {
 375     return known_gettable_ctx_params;
 376 }
 377
 378 static int rsa_set_ctx_params(void *vprsactx, const OSSL_PARAM params[])
 379 {
 380     PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
 381     const OSSL_PARAM *p;
 382     char mdname[OSSL_MAX_NAME_SIZE];
 383     char mdprops[OSSL_MAX_PROPQUERY_SIZE] = { '\0' };
 384     char *str = mdname;
 385
 386     if (prsactx == NULL || params == NULL)
 387         return 0;
 388
 389     p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST);
 390     if (p != NULL) {
 391         if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdname)))
 392             return 0;
 393
 394         str = mdprops;
 395         p = OSSL_PARAM_locate_const(params,
 396                                     OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST_PROPS);
 397         if (p != NULL) {
 398             if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdprops)))
 399                 return 0;
 400         }
 401
 402         EVP_MD_free(prsactx->oaep_md);
 403         prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, mdname, mdprops);
 404
 405         if (prsactx->oaep_md == NULL)
 406             return 0;
 407     }
 408
 409     p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_PAD_MODE);
 410     if (p != NULL) {
 411         int pad_mode = 0;
 412
 413         switch (p->data_type) {
 414         case OSSL_PARAM_INTEGER: /* Support for legacy pad mode number */
 415             if (!OSSL_PARAM_get_int(p, &pad_mode))
 416                 return 0;
 417             break;
 418         case OSSL_PARAM_UTF8_STRING:
 419             {
 420                 int i;
 421
 422                 if (p->data == NULL)
 423                     return 0;
 424
 425                 for (i = 0; padding_item[i].id != 0; i++) {
 426                     if (strcmp(p->data, padding_item[i].ptr) == 0) {
 427                         pad_mode = padding_item[i].id;
 428                         break;
 429                     }
 430                 }
 431             }
 432             break;
 433         default:
 434             return 0;
 435         }
 436
 437         /*
 438          * PSS padding is for signatures only so is not compatible with
 439          * asymmetric cipher use.
 440          */
 441         if (pad_mode == RSA_PKCS1_PSS_PADDING)
 442             return 0;
 443         if (pad_mode == RSA_PKCS1_OAEP_PADDING && prsactx->oaep_md == NULL) {
 444             prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, "SHA1", mdprops);
 445             if (prsactx->oaep_md == NULL)
 446                 return 0;
 447         }
 448         prsactx->pad_mode = pad_mode;
 449     }
 450
 451     p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST);
 452     if (p != NULL) {
 453         if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdname)))
 454             return 0;
 455
 456         str = mdprops;
 457         p = OSSL_PARAM_locate_const(params,
 458                                     OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST_PROPS);
 459         if (p != NULL) {
 460             if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdprops)))
 461                 return 0;
 462         } else {
 463             str = NULL;
 464         }
 465
 466         EVP_MD_free(prsactx->mgf1_md);
 467         prsactx->mgf1_md = EVP_MD_fetch(prsactx->libctx, mdname, str);
 468
 469         if (prsactx->mgf1_md == NULL)
 470             return 0;
 471     }
 472
 473     p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL);
 474     if (p != NULL) {
 475         void *tmp_label = NULL;
 476         size_t tmp_labellen;
 477
 478         if (!OSSL_PARAM_get_octet_string(p, &tmp_label, 0, &tmp_labellen))
 479             return 0;
 480         OPENSSL_free(prsactx->oaep_label);
 481         prsactx->oaep_label = (unsigned char *)tmp_label;
 482         prsactx->oaep_labellen = tmp_labellen;
 483     }
 484
 485     p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION);
 486     if (p != NULL) {
 487         unsigned int client_version;
 488
 489         if (!OSSL_PARAM_get_uint(p, &client_version))
 490             return 0;
 491         prsactx->client_version = client_version;
 492     }
 493
 494     p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION);
 495     if (p != NULL) {
 496         unsigned int alt_version;
 497
 498         if (!OSSL_PARAM_get_uint(p, &alt_version))
 499             return 0;
 500         prsactx->alt_version = alt_version;
 501     }
 502
 503     return 1;
 504 }
 505
 506 static const OSSL_PARAM known_settable_ctx_params[] = {
 507     OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST, NULL, 0),
 508     OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_PAD_MODE, NULL, 0),
 509     OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST, NULL, 0),
 510     OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST_PROPS, NULL, 0),
 511     OSSL_PARAM_octet_string(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL, NULL, 0),
 512     OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION, NULL),
 513     OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION, NULL),
 514     OSSL_PARAM_END
 515 };
 516
 517 static const OSSL_PARAM *rsa_settable_ctx_params(void)
 518 {
 519     return known_settable_ctx_params;
 520 }
 521
 522 const OSSL_DISPATCH rsa_asym_cipher_functions[] = {
 523     { OSSL_FUNC_ASYM_CIPHER_NEWCTX, (void (*)(void))rsa_newctx },
 524     { OSSL_FUNC_ASYM_CIPHER_ENCRYPT_INIT, (void (*)(void))rsa_init },
 525     { OSSL_FUNC_ASYM_CIPHER_ENCRYPT, (void (*)(void))rsa_encrypt },
 526     { OSSL_FUNC_ASYM_CIPHER_DECRYPT_INIT, (void (*)(void))rsa_init },
 527     { OSSL_FUNC_ASYM_CIPHER_DECRYPT, (void (*)(void))rsa_decrypt },
 528     { OSSL_FUNC_ASYM_CIPHER_FREECTX, (void (*)(void))rsa_freectx },
 529     { OSSL_FUNC_ASYM_CIPHER_DUPCTX, (void (*)(void))rsa_dupctx },
 530     { OSSL_FUNC_ASYM_CIPHER_GET_CTX_PARAMS,
 531       (void (*)(void))rsa_get_ctx_params },
 532     { OSSL_FUNC_ASYM_CIPHER_GETTABLE_CTX_PARAMS,
 533       (void (*)(void))rsa_gettable_ctx_params },
 534     { OSSL_FUNC_ASYM_CIPHER_SET_CTX_PARAMS,
 535       (void (*)(void))rsa_set_ctx_params },
 536     { OSSL_FUNC_ASYM_CIPHER_SETTABLE_CTX_PARAMS,
 537       (void (*)(void))rsa_settable_ctx_params },
 538     { 0, NULL }
 539 };