providers/implementations/asymciphers/rsa_enc.c

   1 /*
   2  * Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 /*
  11  * 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_dispatch.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_FUNC_asym_cipher_newctx_fn rsa_newctx;
  35 static OSSL_FUNC_asym_cipher_encrypt_init_fn rsa_init;
  36 static OSSL_FUNC_asym_cipher_encrypt_fn rsa_encrypt;
  37 static OSSL_FUNC_asym_cipher_decrypt_init_fn rsa_init;
  38 static OSSL_FUNC_asym_cipher_decrypt_fn rsa_decrypt;
  39 static OSSL_FUNC_asym_cipher_freectx_fn rsa_freectx;
  40 static OSSL_FUNC_asym_cipher_dupctx_fn rsa_dupctx;
  41 static OSSL_FUNC_asym_cipher_get_ctx_params_fn rsa_get_ctx_params;
  42 static OSSL_FUNC_asym_cipher_gettable_ctx_params_fn rsa_gettable_ctx_params;
  43 static OSSL_FUNC_asym_cipher_set_ctx_params_fn rsa_set_ctx_params;
  44 static OSSL_FUNC_asym_cipher_settable_ctx_params_fn rsa_settable_ctx_params;
  45
  46 static OSSL_ITEM padding_item[] = {
  47     { RSA_PKCS1_PADDING,        OSSL_PKEY_RSA_PAD_MODE_PKCSV15 },
  48     { RSA_SSLV23_PADDING,       OSSL_PKEY_RSA_PAD_MODE_SSLV23 },
  49     { RSA_NO_PADDING,           OSSL_PKEY_RSA_PAD_MODE_NONE },
  50     { RSA_PKCS1_OAEP_PADDING,   OSSL_PKEY_RSA_PAD_MODE_OAEP }, /* Correct spelling first */
  51     { RSA_PKCS1_OAEP_PADDING,   "oeap"   },
  52     { RSA_X931_PADDING,         OSSL_PKEY_RSA_PAD_MODE_X931 },
  53     { 0,                        NULL     }
  54 };
  55
  56 /*
  57  * What's passed as an actual key is defined by the KEYMGMT interface.
  58  * We happen to know that our KEYMGMT simply passes RSA structures, so
  59  * we use that here too.
  60  */
  61
  62 typedef struct {
  63     OPENSSL_CTX *libctx;
  64     RSA *rsa;
  65     int pad_mode;
  66     /* OAEP message digest */
  67     EVP_MD *oaep_md;
  68     /* message digest for MGF1 */
  69     EVP_MD *mgf1_md;
  70     /* OAEP label */
  71     unsigned char *oaep_label;
  72     size_t oaep_labellen;
  73     /* TLS padding */
  74     unsigned int client_version;
  75     unsigned int alt_version;
  76 } PROV_RSA_CTX;
  77
  78 static void *rsa_newctx(void *provctx)
  79 {
  80     PROV_RSA_CTX *prsactx =  OPENSSL_zalloc(sizeof(PROV_RSA_CTX));
  81
  82     if (prsactx == NULL)
  83         return NULL;
  84     prsactx->libctx = PROV_LIBRARY_CONTEXT_OF(provctx);
  85
  86     return prsactx;
  87 }
  88
  89 static int rsa_init(void *vprsactx, void *vrsa)
  90 {
  91     PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
  92
  93     if (prsactx == NULL || vrsa == NULL || !RSA_up_ref(vrsa))
  94         return 0;
  95     RSA_free(prsactx->rsa);
  96     prsactx->rsa = vrsa;
  97
  98     switch (RSA_test_flags(prsactx->rsa, RSA_FLAG_TYPE_MASK)) {
  99     case RSA_FLAG_TYPE_RSA:
 100         prsactx->pad_mode = RSA_PKCS1_PADDING;
 101         break;
 102     default:
 103         ERR_raise(ERR_LIB_PROV, PROV_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 104         return 0;
 105     }
 106
 107     return 1;
 108 }
 109
 110 static int rsa_encrypt(void *vprsactx, unsigned char *out, size_t *outlen,
 111                        size_t outsize, const unsigned char *in, size_t inlen)
 112 {
 113     PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
 114     int ret;
 115
 116     if (out == NULL) {
 117         size_t len = RSA_size(prsactx->rsa);
 118
 119         if (len == 0) {
 120             ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY);
 121             return 0;
 122         }
 123         *outlen = len;
 124         return 1;
 125     }
 126
 127     if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
 128         int rsasize = RSA_size(prsactx->rsa);
 129         unsigned char *tbuf;
 130
 131         if ((tbuf = OPENSSL_malloc(rsasize)) == NULL) {
 132             PROVerr(0, ERR_R_MALLOC_FAILURE);
 133             return 0;
 134         }
 135         if (prsactx->oaep_md == NULL) {
 136             OPENSSL_free(tbuf);
 137             prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, "SHA-1", NULL);
 138             PROVerr(0, ERR_R_INTERNAL_ERROR);
 139             return 0;
 140         }
 141         ret =
 142             rsa_padding_add_PKCS1_OAEP_mgf1_with_libctx(prsactx->libctx, tbuf,
 143                                                         rsasize, in, inlen,
 144                                                         prsactx->oaep_label,
 145                                                         prsactx->oaep_labellen,
 146                                                         prsactx->oaep_md,
 147                                                         prsactx->mgf1_md);
 148
 149         if (!ret) {
 150             OPENSSL_free(tbuf);
 151             return 0;
 152         }
 153         ret = RSA_public_encrypt(rsasize, tbuf, out, prsactx->rsa,
 154                                  RSA_NO_PADDING);
 155         OPENSSL_free(tbuf);
 156     } else {
 157         ret = RSA_public_encrypt(inlen, in, out, prsactx->rsa,
 158                                  prsactx->pad_mode);
 159     }
 160     /* A ret value of 0 is not an error */
 161     if (ret < 0)
 162         return ret;
 163     *outlen = ret;
 164     return 1;
 165 }
 166
 167 static int rsa_decrypt(void *vprsactx, unsigned char *out, size_t *outlen,
 168                        size_t outsize, const unsigned char *in, size_t inlen)
 169 {
 170     PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
 171     int ret;
 172     size_t len = RSA_size(prsactx->rsa);
 173
 174     if (prsactx->pad_mode == RSA_PKCS1_WITH_TLS_PADDING) {
 175         if (out == NULL) {
 176             *outlen = SSL_MAX_MASTER_KEY_LENGTH;
 177             return 1;
 178         }
 179         if (outsize < SSL_MAX_MASTER_KEY_LENGTH) {
 180             ERR_raise(ERR_LIB_PROV, PROV_R_BAD_LENGTH);
 181             return 0;
 182         }
 183     } else {
 184         if (out == NULL) {
 185             if (len == 0) {
 186                 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY);
 187                 return 0;
 188             }
 189             *outlen = len;
 190             return 1;
 191         }
 192
 193         if (outsize < len) {
 194             ERR_raise(ERR_LIB_PROV, PROV_R_BAD_LENGTH);
 195             return 0;
 196         }
 197     }
 198
 199     if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING
 200             || prsactx->pad_mode == RSA_PKCS1_WITH_TLS_PADDING) {
 201         unsigned char *tbuf;
 202
 203         if ((tbuf = OPENSSL_malloc(len)) == NULL) {
 204             PROVerr(0, ERR_R_MALLOC_FAILURE);
 205             return 0;
 206         }
 207         ret = RSA_private_decrypt(inlen, in, tbuf, prsactx->rsa,
 208                                   RSA_NO_PADDING);
 209         /*
 210          * With no padding then, on success ret should be len, otherwise an
 211          * error occurred (non-constant time)
 212          */
 213         if (ret != (int)len) {
 214             OPENSSL_free(tbuf);
 215             ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_DECRYPT);
 216             return 0;
 217         }
 218         if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
 219             if (prsactx->oaep_md == NULL) {
 220                 prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, "SHA-1", NULL);
 221                 if (prsactx->oaep_md == NULL) {
 222                     PROVerr(0, ERR_R_INTERNAL_ERROR);
 223                     return 0;
 224                 }
 225             }
 226             ret = RSA_padding_check_PKCS1_OAEP_mgf1(out, outsize, tbuf,
 227                                                     len, len,
 228                                                     prsactx->oaep_label,
 229                                                     prsactx->oaep_labellen,
 230                                                     prsactx->oaep_md,
 231                                                     prsactx->mgf1_md);
 232         } else {
 233             /* RSA_PKCS1_WITH_TLS_PADDING */
 234             if (prsactx->client_version <= 0) {
 235                 ERR_raise(ERR_LIB_PROV, PROV_R_BAD_TLS_CLIENT_VERSION);
 236                 return 0;
 237             }
 238             ret = rsa_padding_check_PKCS1_type_2_TLS(prsactx->libctx, out,
 239                                                      outsize,
 240                                                      tbuf, len,
 241                                                      prsactx->client_version,
 242                                                      prsactx->alt_version);
 243         }
 244         OPENSSL_free(tbuf);
 245     } else {
 246         ret = RSA_private_decrypt(inlen, in, out, prsactx->rsa,
 247                                   prsactx->pad_mode);
 248     }
 249     *outlen = constant_time_select_s(constant_time_msb_s(ret), *outlen, ret);
 250     ret = constant_time_select_int(constant_time_msb(ret), 0, 1);
 251     return ret;
 252 }
 253
 254 static void rsa_freectx(void *vprsactx)
 255 {
 256     PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
 257
 258     RSA_free(prsactx->rsa);
 259
 260     EVP_MD_free(prsactx->oaep_md);
 261     EVP_MD_free(prsactx->mgf1_md);
 262     OPENSSL_free(prsactx->oaep_label);
 263
 264     OPENSSL_free(prsactx);
 265 }
 266
 267 static void *rsa_dupctx(void *vprsactx)
 268 {
 269     PROV_RSA_CTX *srcctx = (PROV_RSA_CTX *)vprsactx;
 270     PROV_RSA_CTX *dstctx;
 271
 272     dstctx = OPENSSL_zalloc(sizeof(*srcctx));
 273     if (dstctx == NULL)
 274         return NULL;
 275
 276     *dstctx = *srcctx;
 277     if (dstctx->rsa != NULL && !RSA_up_ref(dstctx->rsa)) {
 278         OPENSSL_free(dstctx);
 279         return NULL;
 280     }
 281
 282     if (dstctx->oaep_md != NULL && !EVP_MD_up_ref(dstctx->oaep_md)) {
 283         RSA_free(dstctx->rsa);
 284         OPENSSL_free(dstctx);
 285         return NULL;
 286     }
 287
 288     if (dstctx->mgf1_md != NULL && !EVP_MD_up_ref(dstctx->mgf1_md)) {
 289         RSA_free(dstctx->rsa);
 290         EVP_MD_free(dstctx->oaep_md);
 291         OPENSSL_free(dstctx);
 292         return NULL;
 293     }
 294
 295     return dstctx;
 296 }
 297
 298 static int rsa_get_ctx_params(void *vprsactx, OSSL_PARAM *params)
 299 {
 300     PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
 301     OSSL_PARAM *p;
 302
 303     if (prsactx == NULL || params == NULL)
 304         return 0;
 305
 306     p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_PAD_MODE);
 307     if (p != NULL)
 308         switch (p->data_type) {
 309         case OSSL_PARAM_INTEGER: /* Support for legacy pad mode number */
 310             if (!OSSL_PARAM_set_int(p, prsactx->pad_mode))
 311                 return 0;
 312             break;
 313         case OSSL_PARAM_UTF8_STRING:
 314             {
 315                 int i;
 316                 const char *word = NULL;
 317
 318                 for (i = 0; padding_item[i].id != 0; i++) {
 319                     if (prsactx->pad_mode == (int)padding_item[i].id) {
 320                         word = padding_item[i].ptr;
 321                         break;
 322                     }
 323                 }
 324
 325                 if (word != NULL) {
 326                     if (!OSSL_PARAM_set_utf8_string(p, word))
 327                         return 0;
 328                 } else {
 329                     ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
 330                 }
 331             }
 332             break;
 333         default:
 334             return 0;
 335         }
 336
 337     p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST);
 338     if (p != NULL && !OSSL_PARAM_set_utf8_string(p, prsactx->oaep_md == NULL
 339                                                     ? ""
 340                                                     : EVP_MD_name(prsactx->oaep_md)))
 341         return 0;
 342
 343     p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST);
 344     if (p != NULL) {
 345         EVP_MD *mgf1_md = prsactx->mgf1_md == NULL ? prsactx->oaep_md
 346                                                    : prsactx->mgf1_md;
 347
 348         if (!OSSL_PARAM_set_utf8_string(p, mgf1_md == NULL
 349                                            ? ""
 350                                            : EVP_MD_name(mgf1_md)))
 351         return 0;
 352     }
 353
 354     p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL);
 355     if (p != NULL && !OSSL_PARAM_set_octet_ptr(p, prsactx->oaep_label, 0))
 356         return 0;
 357
 358     p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL_LEN);
 359     if (p != NULL && !OSSL_PARAM_set_size_t(p, prsactx->oaep_labellen))
 360         return 0;
 361
 362     p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION);
 363     if (p != NULL && !OSSL_PARAM_set_uint(p, prsactx->client_version))
 364         return 0;
 365
 366     p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION);
 367     if (p != NULL && !OSSL_PARAM_set_uint(p, prsactx->alt_version))
 368         return 0;
 369
 370     return 1;
 371 }
 372
 373 static const OSSL_PARAM known_gettable_ctx_params[] = {
 374     OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST, NULL, 0),
 375     OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_PAD_MODE, NULL, 0),
 376     OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST, NULL, 0),
 377     OSSL_PARAM_DEFN(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL, OSSL_PARAM_OCTET_PTR,
 378                     NULL, 0),
 379     OSSL_PARAM_size_t(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL_LEN, NULL),
 380     OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION, NULL),
 381     OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION, NULL),
 382     OSSL_PARAM_END
 383 };
 384
 385 static const OSSL_PARAM *rsa_gettable_ctx_params(void)
 386 {
 387     return known_gettable_ctx_params;
 388 }
 389
 390 static int rsa_set_ctx_params(void *vprsactx, const OSSL_PARAM params[])
 391 {
 392     PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
 393     const OSSL_PARAM *p;
 394     char mdname[OSSL_MAX_NAME_SIZE];
 395     char mdprops[OSSL_MAX_PROPQUERY_SIZE] = { '\0' };
 396     char *str = mdname;
 397
 398     if (prsactx == NULL || params == NULL)
 399         return 0;
 400
 401     p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST);
 402     if (p != NULL) {
 403         if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdname)))
 404             return 0;
 405
 406         str = mdprops;
 407         p = OSSL_PARAM_locate_const(params,
 408                                     OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST_PROPS);
 409         if (p != NULL) {
 410             if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdprops)))
 411                 return 0;
 412         }
 413
 414         EVP_MD_free(prsactx->oaep_md);
 415         prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, mdname, mdprops);
 416
 417         if (prsactx->oaep_md == NULL)
 418             return 0;
 419     }
 420
 421     p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_PAD_MODE);
 422     if (p != NULL) {
 423         int pad_mode = 0;
 424
 425         switch (p->data_type) {
 426         case OSSL_PARAM_INTEGER: /* Support for legacy pad mode number */
 427             if (!OSSL_PARAM_get_int(p, &pad_mode))
 428                 return 0;
 429             break;
 430         case OSSL_PARAM_UTF8_STRING:
 431             {
 432                 int i;
 433
 434                 if (p->data == NULL)
 435                     return 0;
 436
 437                 for (i = 0; padding_item[i].id != 0; i++) {
 438                     if (strcmp(p->data, padding_item[i].ptr) == 0) {
 439                         pad_mode = padding_item[i].id;
 440                         break;
 441                     }
 442                 }
 443             }
 444             break;
 445         default:
 446             return 0;
 447         }
 448
 449         /*
 450          * PSS padding is for signatures only so is not compatible with
 451          * asymmetric cipher use.
 452          */
 453         if (pad_mode == RSA_PKCS1_PSS_PADDING)
 454             return 0;
 455         if (pad_mode == RSA_PKCS1_OAEP_PADDING && prsactx->oaep_md == NULL) {
 456             prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, "SHA1", mdprops);
 457             if (prsactx->oaep_md == NULL)
 458                 return 0;
 459         }
 460         prsactx->pad_mode = pad_mode;
 461     }
 462
 463     p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST);
 464     if (p != NULL) {
 465         if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdname)))
 466             return 0;
 467
 468         str = mdprops;
 469         p = OSSL_PARAM_locate_const(params,
 470                                     OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST_PROPS);
 471         if (p != NULL) {
 472             if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdprops)))
 473                 return 0;
 474         } else {
 475             str = NULL;
 476         }
 477
 478         EVP_MD_free(prsactx->mgf1_md);
 479         prsactx->mgf1_md = EVP_MD_fetch(prsactx->libctx, mdname, str);
 480
 481         if (prsactx->mgf1_md == NULL)
 482             return 0;
 483     }
 484
 485     p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL);
 486     if (p != NULL) {
 487         void *tmp_label = NULL;
 488         size_t tmp_labellen;
 489
 490         if (!OSSL_PARAM_get_octet_string(p, &tmp_label, 0, &tmp_labellen))
 491             return 0;
 492         OPENSSL_free(prsactx->oaep_label);
 493         prsactx->oaep_label = (unsigned char *)tmp_label;
 494         prsactx->oaep_labellen = tmp_labellen;
 495     }
 496
 497     p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION);
 498     if (p != NULL) {
 499         unsigned int client_version;
 500
 501         if (!OSSL_PARAM_get_uint(p, &client_version))
 502             return 0;
 503         prsactx->client_version = client_version;
 504     }
 505
 506     p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION);
 507     if (p != NULL) {
 508         unsigned int alt_version;
 509
 510         if (!OSSL_PARAM_get_uint(p, &alt_version))
 511             return 0;
 512         prsactx->alt_version = alt_version;
 513     }
 514
 515     return 1;
 516 }
 517
 518 static const OSSL_PARAM known_settable_ctx_params[] = {
 519     OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST, NULL, 0),
 520     OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_PAD_MODE, NULL, 0),
 521     OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST, NULL, 0),
 522     OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST_PROPS, NULL, 0),
 523     OSSL_PARAM_octet_string(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL, NULL, 0),
 524     OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION, NULL),
 525     OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION, NULL),
 526     OSSL_PARAM_END
 527 };
 528
 529 static const OSSL_PARAM *rsa_settable_ctx_params(void)
 530 {
 531     return known_settable_ctx_params;
 532 }
 533
 534 const OSSL_DISPATCH rsa_asym_cipher_functions[] = {
 535     { OSSL_FUNC_ASYM_CIPHER_NEWCTX, (void (*)(void))rsa_newctx },
 536     { OSSL_FUNC_ASYM_CIPHER_ENCRYPT_INIT, (void (*)(void))rsa_init },
 537     { OSSL_FUNC_ASYM_CIPHER_ENCRYPT, (void (*)(void))rsa_encrypt },
 538     { OSSL_FUNC_ASYM_CIPHER_DECRYPT_INIT, (void (*)(void))rsa_init },
 539     { OSSL_FUNC_ASYM_CIPHER_DECRYPT, (void (*)(void))rsa_decrypt },
 540     { OSSL_FUNC_ASYM_CIPHER_FREECTX, (void (*)(void))rsa_freectx },
 541     { OSSL_FUNC_ASYM_CIPHER_DUPCTX, (void (*)(void))rsa_dupctx },
 542     { OSSL_FUNC_ASYM_CIPHER_GET_CTX_PARAMS,
 543       (void (*)(void))rsa_get_ctx_params },
 544     { OSSL_FUNC_ASYM_CIPHER_GETTABLE_CTX_PARAMS,
 545       (void (*)(void))rsa_gettable_ctx_params },
 546     { OSSL_FUNC_ASYM_CIPHER_SET_CTX_PARAMS,
 547       (void (*)(void))rsa_set_ctx_params },
 548     { OSSL_FUNC_ASYM_CIPHER_SETTABLE_CTX_PARAMS,
 549       (void (*)(void))rsa_settable_ctx_params },
 550     { 0, NULL }
 551 };