providers/implementations/signature/rsa.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 <string.h>
  17 #include <openssl/crypto.h>
  18 #include <openssl/core_numbers.h>
  19 #include <openssl/core_names.h>
  20 #include <openssl/err.h>
  21 #include <openssl/rsa.h>
  22 #include <openssl/params.h>
  23 #include <openssl/evp.h>
  24 #include "internal/cryptlib.h"
  25 #include "internal/nelem.h"
  26 #include "internal/sizes.h"
  27 #include "crypto/rsa.h"
  28 #include "prov/providercommonerr.h"
  29 #include "prov/implementations.h"
  30 #include "prov/provider_ctx.h"
  31 #include "prov/der_rsa.h"
  32
  33 static OSSL_OP_signature_newctx_fn rsa_newctx;
  34 static OSSL_OP_signature_sign_init_fn rsa_signature_init;
  35 static OSSL_OP_signature_verify_init_fn rsa_signature_init;
  36 static OSSL_OP_signature_verify_recover_init_fn rsa_signature_init;
  37 static OSSL_OP_signature_sign_fn rsa_sign;
  38 static OSSL_OP_signature_verify_fn rsa_verify;
  39 static OSSL_OP_signature_verify_recover_fn rsa_verify_recover;
  40 static OSSL_OP_signature_digest_sign_init_fn rsa_digest_signverify_init;
  41 static OSSL_OP_signature_digest_sign_update_fn rsa_digest_signverify_update;
  42 static OSSL_OP_signature_digest_sign_final_fn rsa_digest_sign_final;
  43 static OSSL_OP_signature_digest_verify_init_fn rsa_digest_signverify_init;
  44 static OSSL_OP_signature_digest_verify_update_fn rsa_digest_signverify_update;
  45 static OSSL_OP_signature_digest_verify_final_fn rsa_digest_verify_final;
  46 static OSSL_OP_signature_freectx_fn rsa_freectx;
  47 static OSSL_OP_signature_dupctx_fn rsa_dupctx;
  48 static OSSL_OP_signature_get_ctx_params_fn rsa_get_ctx_params;
  49 static OSSL_OP_signature_gettable_ctx_params_fn rsa_gettable_ctx_params;
  50 static OSSL_OP_signature_set_ctx_params_fn rsa_set_ctx_params;
  51 static OSSL_OP_signature_settable_ctx_params_fn rsa_settable_ctx_params;
  52 static OSSL_OP_signature_get_ctx_md_params_fn rsa_get_ctx_md_params;
  53 static OSSL_OP_signature_gettable_ctx_md_params_fn rsa_gettable_ctx_md_params;
  54 static OSSL_OP_signature_set_ctx_md_params_fn rsa_set_ctx_md_params;
  55 static OSSL_OP_signature_settable_ctx_md_params_fn rsa_settable_ctx_md_params;
  56
  57 static OSSL_ITEM padding_item[] = {
  58     { RSA_PKCS1_PADDING,        "pkcs1"  },
  59     { RSA_SSLV23_PADDING,       "sslv23" },
  60     { RSA_NO_PADDING,           "none"   },
  61     { RSA_PKCS1_OAEP_PADDING,   "oaep"   }, /* Correct spelling first */
  62     { RSA_PKCS1_OAEP_PADDING,   "oeap"   },
  63     { RSA_X931_PADDING,         "x931"   },
  64     { RSA_PKCS1_PSS_PADDING,    "pss"    },
  65     { 0,                        NULL     }
  66 };
  67
  68 /*
  69  * What's passed as an actual key is defined by the KEYMGMT interface.
  70  * We happen to know that our KEYMGMT simply passes RSA structures, so
  71  * we use that here too.
  72  */
  73
  74 typedef struct {
  75     OPENSSL_CTX *libctx;
  76     RSA *rsa;
  77
  78     /*
  79      * Flag to determine if the hash function can be changed (1) or not (0)
  80      * Because it's dangerous to change during a DigestSign or DigestVerify
  81      * operation, this flag is cleared by their Init function, and set again
  82      * by their Final function.
  83      */
  84     unsigned int flag_allow_md : 1;
  85
  86     /* The Algorithm Identifier of the combined signature agorithm */
  87     unsigned char aid_buf[128];
  88     unsigned char *aid;
  89     size_t  aid_len;
  90
  91     /* main digest */
  92     EVP_MD *md;
  93     EVP_MD_CTX *mdctx;
  94     int mdnid;
  95     char mdname[OSSL_MAX_NAME_SIZE]; /* Purely informational */
  96
  97     /* RSA padding mode */
  98     int pad_mode;
  99     /* message digest for MGF1 */
 100     EVP_MD *mgf1_md;
 101     char mgf1_mdname[OSSL_MAX_NAME_SIZE]; /* Purely informational */
 102     /* PSS salt length */
 103     int saltlen;
 104     /* Minimum salt length or -1 if no PSS parameter restriction */
 105     int min_saltlen;
 106
 107     /* Temp buffer */
 108     unsigned char *tbuf;
 109
 110 } PROV_RSA_CTX;
 111
 112 static size_t rsa_get_md_size(const PROV_RSA_CTX *prsactx)
 113 {
 114     if (prsactx->md != NULL)
 115         return EVP_MD_size(prsactx->md);
 116     return 0;
 117 }
 118
 119 static int rsa_get_md_nid(const EVP_MD *md)
 120 {
 121     /*
 122      * Because the RSA library deals with NIDs, we need to translate.
 123      * We do so using EVP_MD_is_a(), and therefore need a name to NID
 124      * map.
 125      */
 126     static const OSSL_ITEM name_to_nid[] = {
 127         { NID_sha1,      OSSL_DIGEST_NAME_SHA1      },
 128         { NID_sha224,    OSSL_DIGEST_NAME_SHA2_224  },
 129         { NID_sha256,    OSSL_DIGEST_NAME_SHA2_256  },
 130         { NID_sha384,    OSSL_DIGEST_NAME_SHA2_384  },
 131         { NID_sha512,    OSSL_DIGEST_NAME_SHA2_512  },
 132         { NID_sha512_224, OSSL_DIGEST_NAME_SHA2_512_224 },
 133         { NID_sha512_256, OSSL_DIGEST_NAME_SHA2_512_256 },
 134         { NID_md5,       OSSL_DIGEST_NAME_MD5       },
 135         { NID_md5_sha1,  OSSL_DIGEST_NAME_MD5_SHA1  },
 136         { NID_md2,       OSSL_DIGEST_NAME_MD2       },
 137         { NID_md4,       OSSL_DIGEST_NAME_MD4       },
 138         { NID_mdc2,      OSSL_DIGEST_NAME_MDC2      },
 139         { NID_ripemd160, OSSL_DIGEST_NAME_RIPEMD160 },
 140         { NID_sha3_224,  OSSL_DIGEST_NAME_SHA3_224  },
 141         { NID_sha3_256,  OSSL_DIGEST_NAME_SHA3_256  },
 142         { NID_sha3_384,  OSSL_DIGEST_NAME_SHA3_384  },
 143         { NID_sha3_512,  OSSL_DIGEST_NAME_SHA3_512  },
 144     };
 145     size_t i;
 146     int mdnid = NID_undef;
 147
 148     if (md == NULL)
 149         goto end;
 150
 151     for (i = 0; i < OSSL_NELEM(name_to_nid); i++) {
 152         if (EVP_MD_is_a(md, name_to_nid[i].ptr)) {
 153             mdnid = (int)name_to_nid[i].id;
 154             break;
 155         }
 156     }
 157
 158     if (mdnid == NID_undef)
 159         ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DIGEST);
 160
 161  end:
 162     return mdnid;
 163 }
 164
 165 static int rsa_check_padding(int mdnid, int padding)
 166 {
 167     if (padding == RSA_NO_PADDING) {
 168         ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_PADDING_MODE);
 169         return 0;
 170     }
 171
 172     if (padding == RSA_X931_PADDING) {
 173         if (RSA_X931_hash_id(mdnid) == -1) {
 174             ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_X931_DIGEST);
 175             return 0;
 176         }
 177     }
 178
 179     return 1;
 180 }
 181
 182 static void *rsa_newctx(void *provctx)
 183 {
 184     PROV_RSA_CTX *prsactx = OPENSSL_zalloc(sizeof(PROV_RSA_CTX));
 185
 186     if (prsactx == NULL)
 187         return NULL;
 188
 189     prsactx->libctx = PROV_LIBRARY_CONTEXT_OF(provctx);
 190     prsactx->flag_allow_md = 1;
 191     return prsactx;
 192 }
 193
 194 /* True if PSS parameters are restricted */
 195 #define rsa_pss_restricted(prsactx) (prsactx->min_saltlen != -1)
 196
 197 static int rsa_signature_init(void *vprsactx, void *vrsa)
 198 {
 199     PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
 200
 201     if (prsactx == NULL || vrsa == NULL || !RSA_up_ref(vrsa))
 202         return 0;
 203
 204     RSA_free(prsactx->rsa);
 205     prsactx->rsa = vrsa;
 206     if (RSA_get0_pss_params(prsactx->rsa) != NULL)
 207         prsactx->pad_mode = RSA_PKCS1_PSS_PADDING;
 208     else
 209         prsactx->pad_mode = RSA_PKCS1_PADDING;
 210     /* Maximum for sign, auto for verify */
 211     prsactx->saltlen = RSA_PSS_SALTLEN_AUTO;
 212     prsactx->min_saltlen = -1;
 213
 214     return 1;
 215 }
 216
 217 static int rsa_setup_md(PROV_RSA_CTX *ctx, const char *mdname,
 218                         const char *mdprops)
 219 {
 220     if (mdname != NULL) {
 221         EVP_MD *md = EVP_MD_fetch(ctx->libctx, mdname, mdprops);
 222         int md_nid = rsa_get_md_nid(md);
 223         WPACKET pkt;
 224
 225         if (md == NULL
 226             || md_nid == NID_undef
 227             || !rsa_check_padding(md_nid, ctx->pad_mode)) {
 228             EVP_MD_free(md);
 229             return 0;
 230         }
 231
 232         EVP_MD_CTX_free(ctx->mdctx);
 233         EVP_MD_free(ctx->md);
 234
 235         /*
 236          * TODO(3.0) Should we care about DER writing errors?
 237          * All it really means is that for some reason, there's no
 238          * AlgorithmIdentifier to be had (consider RSA with MD5-SHA1),
 239          * but the operation itself is still valid, just as long as it's
 240          * not used to construct anything that needs an AlgorithmIdentifier.
 241          */
 242         ctx->aid_len = 0;
 243         if (WPACKET_init_der(&pkt, ctx->aid_buf, sizeof(ctx->aid_buf))
 244             && DER_w_algorithmIdentifier_RSA_with(&pkt, -1, ctx->rsa, md_nid)
 245             && WPACKET_finish(&pkt)) {
 246             WPACKET_get_total_written(&pkt, &ctx->aid_len);
 247             ctx->aid = WPACKET_get_curr(&pkt);
 248         }
 249         WPACKET_cleanup(&pkt);
 250
 251         ctx->mdctx = NULL;
 252         ctx->md = md;
 253         ctx->mdnid = md_nid;
 254         OPENSSL_strlcpy(ctx->mdname, mdname, sizeof(ctx->mdname));
 255     }
 256
 257     return 1;
 258 }
 259
 260 static int rsa_setup_mgf1_md(PROV_RSA_CTX *ctx, const char *mdname,
 261                              const char *props)
 262 {
 263     if (ctx->mgf1_mdname[0] != '\0')
 264         EVP_MD_free(ctx->mgf1_md);
 265
 266     if ((ctx->mgf1_md = EVP_MD_fetch(ctx->libctx, mdname, props)) == NULL)
 267         return 0;
 268     OPENSSL_strlcpy(ctx->mgf1_mdname, mdname, sizeof(ctx->mgf1_mdname));
 269
 270     return 1;
 271 }
 272
 273 static int setup_tbuf(PROV_RSA_CTX *ctx)
 274 {
 275     if (ctx->tbuf != NULL)
 276         return 1;
 277     if ((ctx->tbuf = OPENSSL_malloc(RSA_size(ctx->rsa))) == NULL) {
 278         ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
 279         return 0;
 280     }
 281     return 1;
 282 }
 283
 284 static void clean_tbuf(PROV_RSA_CTX *ctx)
 285 {
 286     if (ctx->tbuf != NULL)
 287         OPENSSL_cleanse(ctx->tbuf, RSA_size(ctx->rsa));
 288 }
 289
 290 static void free_tbuf(PROV_RSA_CTX *ctx)
 291 {
 292     OPENSSL_clear_free(ctx->tbuf, RSA_size(ctx->rsa));
 293     ctx->tbuf = NULL;
 294 }
 295
 296 static int rsa_sign(void *vprsactx, unsigned char *sig, size_t *siglen,
 297                     size_t sigsize, const unsigned char *tbs, size_t tbslen)
 298 {
 299     PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
 300     int ret;
 301     size_t rsasize = RSA_size(prsactx->rsa);
 302     size_t mdsize = rsa_get_md_size(prsactx);
 303
 304     if (sig == NULL) {
 305         *siglen = rsasize;
 306         return 1;
 307     }
 308
 309     if (sigsize < (size_t)rsasize)
 310         return 0;
 311
 312     if (mdsize != 0) {
 313         if (tbslen != mdsize) {
 314             ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DIGEST_LENGTH);
 315             return 0;
 316         }
 317
 318 #ifndef FIPS_MODULE
 319         if (EVP_MD_is_a(prsactx->md, OSSL_DIGEST_NAME_MDC2)) {
 320             unsigned int sltmp;
 321
 322             if (prsactx->pad_mode != RSA_PKCS1_PADDING) {
 323                 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_PADDING_MODE,
 324                                "only PKCS#1 padding supported with MDC2");
 325                 return 0;
 326             }
 327             ret = RSA_sign_ASN1_OCTET_STRING(0, tbs, tbslen, sig, &sltmp,
 328                                              prsactx->rsa);
 329
 330             if (ret <= 0) {
 331                 ERR_raise(ERR_LIB_PROV, ERR_LIB_RSA);
 332                 return 0;
 333             }
 334             ret = sltmp;
 335             goto end;
 336         }
 337 #endif
 338         switch (prsactx->pad_mode) {
 339         case RSA_X931_PADDING:
 340             if ((size_t)RSA_size(prsactx->rsa) < tbslen + 1) {
 341                 ERR_raise(ERR_LIB_PROV, PROV_R_KEY_SIZE_TOO_SMALL);
 342                 return 0;
 343             }
 344             if (!setup_tbuf(prsactx)) {
 345                 ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
 346                 return 0;
 347             }
 348             memcpy(prsactx->tbuf, tbs, tbslen);
 349             prsactx->tbuf[tbslen] = RSA_X931_hash_id(prsactx->mdnid);
 350             ret = RSA_private_encrypt(tbslen + 1, prsactx->tbuf,
 351                                       sig, prsactx->rsa, RSA_X931_PADDING);
 352             clean_tbuf(prsactx);
 353             break;
 354
 355         case RSA_PKCS1_PADDING:
 356             {
 357                 unsigned int sltmp;
 358
 359                 ret = RSA_sign(prsactx->mdnid, tbs, tbslen, sig, &sltmp,
 360                                prsactx->rsa);
 361                 if (ret <= 0) {
 362                     ERR_raise(ERR_LIB_PROV, ERR_LIB_RSA);
 363                     return 0;
 364                 }
 365                 ret = sltmp;
 366             }
 367             break;
 368
 369         case RSA_PKCS1_PSS_PADDING:
 370             /* Check PSS restrictions */
 371             if (rsa_pss_restricted(prsactx)) {
 372                 switch (prsactx->saltlen) {
 373                 case RSA_PSS_SALTLEN_DIGEST:
 374                     if (prsactx->min_saltlen > EVP_MD_size(prsactx->md)) {
 375                         ERR_raise(ERR_LIB_PROV, PROV_R_PSS_SALTLEN_TOO_SMALL);
 376                         return 0;
 377                     }
 378                     /* FALLTHRU */
 379                 default:
 380                     if (prsactx->saltlen >= 0
 381                         && prsactx->saltlen < prsactx->min_saltlen) {
 382                         ERR_raise(ERR_LIB_PROV, PROV_R_PSS_SALTLEN_TOO_SMALL);
 383                         return 0;
 384                     }
 385                     break;
 386                 }
 387             }
 388             if (!setup_tbuf(prsactx))
 389                 return 0;
 390             if (!RSA_padding_add_PKCS1_PSS_mgf1(prsactx->rsa,
 391                                                 prsactx->tbuf, tbs,
 392                                                 prsactx->md, prsactx->mgf1_md,
 393                                                 prsactx->saltlen)) {
 394                 ERR_raise(ERR_LIB_PROV, ERR_LIB_RSA);
 395                 return 0;
 396             }
 397             ret = RSA_private_encrypt(RSA_size(prsactx->rsa), prsactx->tbuf,
 398                                       sig, prsactx->rsa, RSA_NO_PADDING);
 399             clean_tbuf(prsactx);
 400             break;
 401
 402         default:
 403             ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_PADDING_MODE,
 404                            "Only X.931, PKCS#1 v1.5 or PSS padding allowed");
 405             return 0;
 406         }
 407     } else {
 408         ret = RSA_private_encrypt(tbslen, tbs, sig, prsactx->rsa,
 409                                   prsactx->pad_mode);
 410     }
 411
 412 #ifndef FIPS_MODULE
 413  end:
 414 #endif
 415     if (ret <= 0) {
 416         ERR_raise(ERR_LIB_PROV, ERR_LIB_RSA);
 417         return 0;
 418     }
 419
 420     *siglen = ret;
 421     return 1;
 422 }
 423
 424 static int rsa_verify_recover(void *vprsactx,
 425                               unsigned char *rout,
 426                               size_t *routlen,
 427                               size_t routsize,
 428                               const unsigned char *sig,
 429                               size_t siglen)
 430 {
 431     PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
 432     int ret;
 433
 434     if (rout == NULL) {
 435         *routlen = RSA_size(prsactx->rsa);
 436         return 1;
 437     }
 438
 439     if (prsactx->md != NULL) {
 440         switch (prsactx->pad_mode) {
 441         case RSA_X931_PADDING:
 442             if (!setup_tbuf(prsactx))
 443                 return 0;
 444             ret = RSA_public_decrypt(siglen, sig, prsactx->tbuf, prsactx->rsa,
 445                                      RSA_X931_PADDING);
 446             if (ret < 1) {
 447                 ERR_raise(ERR_LIB_PROV, ERR_LIB_RSA);
 448                 return 0;
 449             }
 450             ret--;
 451             if (prsactx->tbuf[ret] != RSA_X931_hash_id(prsactx->mdnid)) {
 452                 ERR_raise(ERR_LIB_PROV, PROV_R_ALGORITHM_MISMATCH);
 453                 return 0;
 454             }
 455             if (ret != EVP_MD_size(prsactx->md)) {
 456                 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST_LENGTH,
 457                                "Should be %d, but got %d",
 458                                EVP_MD_size(prsactx->md), ret);
 459                 return 0;
 460             }
 461
 462             *routlen = ret;
 463             if (routsize < (size_t)ret) {
 464                 ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
 465                 return 0;
 466             }
 467             memcpy(rout, prsactx->tbuf, ret);
 468             break;
 469
 470         case RSA_PKCS1_PADDING:
 471             {
 472                 size_t sltmp;
 473
 474                 ret = int_rsa_verify(prsactx->mdnid, NULL, 0, rout, &sltmp,
 475                                      sig, siglen, prsactx->rsa);
 476                 if (ret <= 0) {
 477                     ERR_raise(ERR_LIB_PROV, ERR_LIB_RSA);
 478                     return 0;
 479                 }
 480                 ret = sltmp;
 481             }
 482             break;
 483
 484         default:
 485             ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_PADDING_MODE,
 486                            "Only X.931 or PKCS#1 v1.5 padding allowed");
 487             return 0;
 488         }
 489     } else {
 490         ret = RSA_public_decrypt(siglen, sig, rout, prsactx->rsa,
 491                                  prsactx->pad_mode);
 492         if (ret < 0) {
 493             ERR_raise(ERR_LIB_PROV, ERR_LIB_RSA);
 494             return 0;
 495         }
 496     }
 497     *routlen = ret;
 498     return 1;
 499 }
 500
 501 static int rsa_verify(void *vprsactx, const unsigned char *sig, size_t siglen,
 502                       const unsigned char *tbs, size_t tbslen)
 503 {
 504     PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
 505     size_t rslen;
 506
 507     if (prsactx->md != NULL) {
 508         switch (prsactx->pad_mode) {
 509         case RSA_PKCS1_PADDING:
 510             if (!RSA_verify(prsactx->mdnid, tbs, tbslen, sig, siglen,
 511                             prsactx->rsa)) {
 512                 ERR_raise(ERR_LIB_PROV, ERR_LIB_RSA);
 513                 return 0;
 514             }
 515             return 1;
 516         case RSA_X931_PADDING:
 517             if (rsa_verify_recover(prsactx, NULL, &rslen, 0, sig, siglen) <= 0)
 518                 return 0;
 519             break;
 520         case RSA_PKCS1_PSS_PADDING:
 521             {
 522                 int ret;
 523                 size_t mdsize;
 524
 525                 /* Check PSS restrictions */
 526                 if (rsa_pss_restricted(prsactx)) {
 527                     switch (prsactx->saltlen) {
 528                     case RSA_PSS_SALTLEN_AUTO:
 529                         ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_PSS_SALTLEN);
 530                         return 0;
 531                     case RSA_PSS_SALTLEN_DIGEST:
 532                         if (prsactx->min_saltlen > EVP_MD_size(prsactx->md)) {
 533                             ERR_raise(ERR_LIB_PROV,
 534                                       PROV_R_PSS_SALTLEN_TOO_SMALL);
 535                             return 0;
 536                         }
 537                         /* FALLTHRU */
 538                     default:
 539                         if (prsactx->saltlen >= 0
 540                             && prsactx->saltlen < prsactx->min_saltlen) {
 541                             ERR_raise(ERR_LIB_PROV, PROV_R_PSS_SALTLEN_TOO_SMALL);
 542                             return 0;
 543                         }
 544                         break;
 545                     }
 546                 }
 547
 548                 /*
 549                  * We need to check this for the RSA_verify_PKCS1_PSS_mgf1()
 550                  * call
 551                  */
 552                 mdsize = rsa_get_md_size(prsactx);
 553                 if (tbslen != mdsize) {
 554                     ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST_LENGTH,
 555                                    "Should be %d, but got %d",
 556                                    mdsize, tbslen);
 557                     return 0;
 558                 }
 559
 560                 if (!setup_tbuf(prsactx))
 561                     return 0;
 562                 ret = RSA_public_decrypt(siglen, sig, prsactx->tbuf,
 563                                          prsactx->rsa, RSA_NO_PADDING);
 564                 if (ret <= 0) {
 565                     ERR_raise(ERR_LIB_PROV, ERR_LIB_RSA);
 566                     return 0;
 567                 }
 568                 ret = RSA_verify_PKCS1_PSS_mgf1(prsactx->rsa, tbs,
 569                                                 prsactx->md, prsactx->mgf1_md,
 570                                                 prsactx->tbuf,
 571                                                 prsactx->saltlen);
 572                 if (ret <= 0) {
 573                     ERR_raise(ERR_LIB_PROV, ERR_LIB_RSA);
 574                     return 0;
 575                 }
 576                 return 1;
 577             }
 578         default:
 579             ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_PADDING_MODE,
 580                            "Only X.931, PKCS#1 v1.5 or PSS padding allowed");
 581             return 0;
 582         }
 583     } else {
 584         if (!setup_tbuf(prsactx))
 585             return 0;
 586         rslen = RSA_public_decrypt(siglen, sig, prsactx->tbuf, prsactx->rsa,
 587                                    prsactx->pad_mode);
 588         if (rslen == 0) {
 589             ERR_raise(ERR_LIB_PROV, ERR_LIB_RSA);
 590             return 0;
 591         }
 592     }
 593
 594     if ((rslen != tbslen) || memcmp(tbs, prsactx->tbuf, rslen))
 595         return 0;
 596
 597     return 1;
 598 }
 599
 600 static int rsa_digest_signverify_init(void *vprsactx, const char *mdname,
 601                                       const char *props, void *vrsa)
 602 {
 603     PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
 604
 605     prsactx->flag_allow_md = 0;
 606     if (!rsa_signature_init(vprsactx, vrsa)
 607         || !rsa_setup_md(prsactx, mdname, props))
 608         return 0;
 609
 610     prsactx->mdctx = EVP_MD_CTX_new();
 611     if (prsactx->mdctx == NULL)
 612         goto error;
 613
 614     if (!EVP_DigestInit_ex(prsactx->mdctx, prsactx->md, NULL))
 615         goto error;
 616
 617     return 1;
 618
 619  error:
 620     EVP_MD_CTX_free(prsactx->mdctx);
 621     EVP_MD_free(prsactx->md);
 622     prsactx->mdctx = NULL;
 623     prsactx->md = NULL;
 624     return 0;
 625 }
 626
 627 int rsa_digest_signverify_update(void *vprsactx, const unsigned char *data,
 628                                  size_t datalen)
 629 {
 630     PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
 631
 632     if (prsactx == NULL || prsactx->mdctx == NULL)
 633         return 0;
 634
 635     return EVP_DigestUpdate(prsactx->mdctx, data, datalen);
 636 }
 637
 638 int rsa_digest_sign_final(void *vprsactx, unsigned char *sig, size_t *siglen,
 639                           size_t sigsize)
 640 {
 641     PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
 642     unsigned char digest[EVP_MAX_MD_SIZE];
 643     unsigned int dlen = 0;
 644
 645     prsactx->flag_allow_md = 1;
 646     if (prsactx == NULL || prsactx->mdctx == NULL)
 647         return 0;
 648
 649     /*
 650      * If sig is NULL then we're just finding out the sig size. Other fields
 651      * are ignored. Defer to rsa_sign.
 652      */
 653     if (sig != NULL) {
 654         /*
 655          * TODO(3.0): There is the possibility that some externally provided
 656          * digests exceed EVP_MAX_MD_SIZE. We should probably handle that somehow -
 657          * but that problem is much larger than just in RSA.
 658          */
 659         if (!EVP_DigestFinal_ex(prsactx->mdctx, digest, &dlen))
 660             return 0;
 661     }
 662
 663     return rsa_sign(vprsactx, sig, siglen, sigsize, digest, (size_t)dlen);
 664 }
 665
 666
 667 int rsa_digest_verify_final(void *vprsactx, const unsigned char *sig,
 668                             size_t siglen)
 669 {
 670     PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
 671     unsigned char digest[EVP_MAX_MD_SIZE];
 672     unsigned int dlen = 0;
 673
 674     prsactx->flag_allow_md = 1;
 675     if (prsactx == NULL || prsactx->mdctx == NULL)
 676         return 0;
 677
 678     /*
 679      * TODO(3.0): There is the possibility that some externally provided
 680      * digests exceed EVP_MAX_MD_SIZE. We should probably handle that somehow -
 681      * but that problem is much larger than just in RSA.
 682      */
 683     if (!EVP_DigestFinal_ex(prsactx->mdctx, digest, &dlen))
 684         return 0;
 685
 686     return rsa_verify(vprsactx, sig, siglen, digest, (size_t)dlen);
 687 }
 688
 689 static void rsa_freectx(void *vprsactx)
 690 {
 691     PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
 692
 693     if (prsactx == NULL)
 694         return;
 695
 696     RSA_free(prsactx->rsa);
 697     EVP_MD_CTX_free(prsactx->mdctx);
 698     EVP_MD_free(prsactx->md);
 699     EVP_MD_free(prsactx->mgf1_md);
 700     free_tbuf(prsactx);
 701
 702     OPENSSL_clear_free(prsactx, sizeof(prsactx));
 703 }
 704
 705 static void *rsa_dupctx(void *vprsactx)
 706 {
 707     PROV_RSA_CTX *srcctx = (PROV_RSA_CTX *)vprsactx;
 708     PROV_RSA_CTX *dstctx;
 709
 710     dstctx = OPENSSL_zalloc(sizeof(*srcctx));
 711     if (dstctx == NULL)
 712         return NULL;
 713
 714     *dstctx = *srcctx;
 715     dstctx->rsa = NULL;
 716     dstctx->md = NULL;
 717     dstctx->mdctx = NULL;
 718     dstctx->tbuf = NULL;
 719
 720     if (srcctx->rsa != NULL && !RSA_up_ref(srcctx->rsa))
 721         goto err;
 722     dstctx->rsa = srcctx->rsa;
 723
 724     if (srcctx->md != NULL && !EVP_MD_up_ref(srcctx->md))
 725         goto err;
 726     dstctx->md = srcctx->md;
 727
 728     if (srcctx->mgf1_md != NULL && !EVP_MD_up_ref(srcctx->mgf1_md))
 729         goto err;
 730     dstctx->mgf1_md = srcctx->mgf1_md;
 731
 732     if (srcctx->mdctx != NULL) {
 733         dstctx->mdctx = EVP_MD_CTX_new();
 734         if (dstctx->mdctx == NULL
 735                 || !EVP_MD_CTX_copy_ex(dstctx->mdctx, srcctx->mdctx))
 736             goto err;
 737     }
 738
 739     return dstctx;
 740  err:
 741     rsa_freectx(dstctx);
 742     return NULL;
 743 }
 744
 745 static int rsa_get_ctx_params(void *vprsactx, OSSL_PARAM *params)
 746 {
 747     PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
 748     OSSL_PARAM *p;
 749
 750     if (prsactx == NULL || params == NULL)
 751         return 0;
 752
 753     p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_ALGORITHM_ID);
 754     if (p != NULL
 755         && !OSSL_PARAM_set_octet_string(p, prsactx->aid, prsactx->aid_len))
 756         return 0;
 757
 758     p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_PAD_MODE);
 759     if (p != NULL)
 760         switch (p->data_type) {
 761         case OSSL_PARAM_INTEGER:
 762             if (!OSSL_PARAM_set_int(p, prsactx->pad_mode))
 763                 return 0;
 764             break;
 765         case OSSL_PARAM_UTF8_STRING:
 766             {
 767                 int i;
 768                 const char *word = NULL;
 769
 770                 for (i = 0; padding_item[i].id != 0; i++) {
 771                     if (prsactx->pad_mode == (int)padding_item[i].id) {
 772                         word = padding_item[i].ptr;
 773                         break;
 774                     }
 775                 }
 776
 777                 if (word != NULL) {
 778                     if (!OSSL_PARAM_set_utf8_string(p, word))
 779                         return 0;
 780                 } else {
 781                     ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
 782                 }
 783             }
 784             break;
 785         default:
 786             return 0;
 787         }
 788
 789     p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST);
 790     if (p != NULL && !OSSL_PARAM_set_utf8_string(p, prsactx->mdname))
 791         return 0;
 792
 793     p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_MGF1_DIGEST);
 794     if (p != NULL && !OSSL_PARAM_set_utf8_string(p, prsactx->mgf1_mdname))
 795         return 0;
 796
 797     p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_PSS_SALTLEN);
 798     if (p != NULL) {
 799         if (p->data_type == OSSL_PARAM_INTEGER) {
 800             if (!OSSL_PARAM_set_int(p, prsactx->saltlen))
 801                 return 0;
 802         } else if (p->data_type == OSSL_PARAM_UTF8_STRING) {
 803             switch (prsactx->saltlen) {
 804             case RSA_PSS_SALTLEN_DIGEST:
 805                 if (!OSSL_PARAM_set_utf8_string(p, "digest"))
 806                     return 0;
 807                 break;
 808             case RSA_PSS_SALTLEN_MAX:
 809                 if (!OSSL_PARAM_set_utf8_string(p, "max"))
 810                     return 0;
 811                 break;
 812             case RSA_PSS_SALTLEN_AUTO:
 813                 if (!OSSL_PARAM_set_utf8_string(p, "auto"))
 814                     return 0;
 815                 break;
 816             default:
 817                 if (BIO_snprintf(p->data, p->data_size, "%d", prsactx->saltlen)
 818                     <= 0)
 819                     return 0;
 820                 break;
 821             }
 822         }
 823     }
 824
 825     return 1;
 826 }
 827
 828 static const OSSL_PARAM known_gettable_ctx_params[] = {
 829     OSSL_PARAM_octet_string(OSSL_SIGNATURE_PARAM_ALGORITHM_ID, NULL, 0),
 830     OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PAD_MODE, NULL, 0),
 831     OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
 832     OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_MGF1_DIGEST, NULL, 0),
 833     OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PSS_SALTLEN, NULL, 0),
 834     OSSL_PARAM_END
 835 };
 836
 837 static const OSSL_PARAM *rsa_gettable_ctx_params(void)
 838 {
 839     return known_gettable_ctx_params;
 840 }
 841
 842 static int rsa_set_ctx_params(void *vprsactx, const OSSL_PARAM params[])
 843 {
 844     PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
 845     const OSSL_PARAM *p;
 846
 847     if (prsactx == NULL || params == NULL)
 848         return 0;
 849
 850     p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST);
 851     /* Not allowed during certain operations */
 852     if (p != NULL && !prsactx->flag_allow_md)
 853         return 0;
 854     if (p != NULL) {
 855         char mdname[OSSL_MAX_NAME_SIZE] = "", *pmdname = mdname;
 856         char mdprops[OSSL_MAX_PROPQUERY_SIZE] = "", *pmdprops = mdprops;
 857         const OSSL_PARAM *propsp =
 858             OSSL_PARAM_locate_const(params,
 859                                     OSSL_SIGNATURE_PARAM_PROPERTIES);
 860
 861         if (!OSSL_PARAM_get_utf8_string(p, &pmdname, sizeof(mdname)))
 862             return 0;
 863         if (propsp != NULL
 864             && !OSSL_PARAM_get_utf8_string(propsp, &pmdprops, sizeof(mdprops)))
 865             return 0;
 866
 867         /* TODO(3.0) PSS check needs more work */
 868         if (rsa_pss_restricted(prsactx)) {
 869             /* TODO(3.0) figure out what to do for prsactx->md == NULL */
 870             if (prsactx->md == NULL || EVP_MD_is_a(prsactx->md, mdname))
 871                 return 1;
 872             ERR_raise(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED);
 873             return 0;
 874         }
 875
 876         /* non-PSS code follows */
 877         if (!rsa_setup_md(prsactx, mdname, mdprops))
 878             return 0;
 879     }
 880
 881     p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_PAD_MODE);
 882     if (p != NULL) {
 883         int pad_mode = 0;
 884
 885         switch (p->data_type) {
 886         case OSSL_PARAM_INTEGER: /* Support for legacy pad mode number */
 887             if (!OSSL_PARAM_get_int(p, &pad_mode))
 888                 return 0;
 889             break;
 890         case OSSL_PARAM_UTF8_STRING:
 891             {
 892                 int i;
 893
 894                 if (p->data == NULL)
 895                     return 0;
 896
 897                 for (i = 0; padding_item[i].id != 0; i++) {
 898                     if (strcmp(p->data, padding_item[i].ptr) == 0) {
 899                         pad_mode = padding_item[i].id;
 900                         break;
 901                     }
 902                 }
 903             }
 904             break;
 905         default:
 906             return 0;
 907         }
 908
 909         switch (pad_mode) {
 910         case RSA_PKCS1_OAEP_PADDING:
 911             /*
 912              * OAEP padding is for asymmetric cipher only so is not compatible
 913              * with signature use.
 914              */
 915             ERR_raise_data(ERR_LIB_PROV,
 916                            PROV_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE,
 917                            "OAEP padding not allowed for signing / verifying");
 918             return 0;
 919         case RSA_PKCS1_PSS_PADDING:
 920             if (prsactx->mdname[0] == '\0')
 921                 rsa_setup_md(prsactx, "SHA1", "");
 922             goto cont;
 923         case RSA_PKCS1_PADDING:
 924         case RSA_SSLV23_PADDING:
 925         case RSA_NO_PADDING:
 926         case RSA_X931_PADDING:
 927             if (RSA_get0_pss_params(prsactx->rsa) != NULL) {
 928                 ERR_raise_data(ERR_LIB_PROV,
 929                                PROV_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE,
 930                                "X.931 padding not allowed with RSA-PSS");
 931                 return 0;
 932             }
 933         cont:
 934             if (!rsa_check_padding(prsactx->mdnid, pad_mode))
 935                 return 0;
 936             break;
 937         default:
 938             return 0;
 939         }
 940         prsactx->pad_mode = pad_mode;
 941     }
 942
 943     p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_PSS_SALTLEN);
 944     if (p != NULL) {
 945         int saltlen;
 946
 947         if (prsactx->pad_mode != RSA_PKCS1_PSS_PADDING) {
 948             ERR_raise_data(ERR_LIB_PROV, PROV_R_NOT_SUPPORTED,
 949                            "PSS saltlen can only be specified if "
 950                            "PSS padding has been specified first");
 951             return 0;
 952         }
 953
 954         switch (p->data_type) {
 955         case OSSL_PARAM_INTEGER: /* Support for legacy pad mode number */
 956             if (!OSSL_PARAM_get_int(p, &saltlen))
 957                 return 0;
 958             break;
 959         case OSSL_PARAM_UTF8_STRING:
 960             if (strcmp(p->data, "digest") == 0)
 961                 saltlen = RSA_PSS_SALTLEN_DIGEST;
 962             else if (strcmp(p->data, "max") == 0)
 963                 saltlen = RSA_PSS_SALTLEN_MAX;
 964             else if (strcmp(p->data, "auto") == 0)
 965                 saltlen = RSA_PSS_SALTLEN_AUTO;
 966             else
 967                 saltlen = atoi(p->data);
 968             break;
 969         default:
 970             return 0;
 971         }
 972
 973         /*
 974          * RSA_PSS_SALTLEN_MAX seems curiously named in this check.
 975          * Contrary to what it's name suggests, it's the currently
 976          * lowest saltlen number possible.
 977          */
 978         if (saltlen < RSA_PSS_SALTLEN_MAX) {
 979             ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_PSS_SALTLEN);
 980             return 0;
 981         }
 982
 983         prsactx->saltlen = saltlen;
 984     }
 985
 986     p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_MGF1_DIGEST);
 987     if (p != NULL) {
 988         char mdname[OSSL_MAX_NAME_SIZE] = "", *pmdname = mdname;
 989         char mdprops[OSSL_MAX_PROPQUERY_SIZE] = "", *pmdprops = mdprops;
 990         const OSSL_PARAM *propsp =
 991             OSSL_PARAM_locate_const(params,
 992                                     OSSL_SIGNATURE_PARAM_MGF1_PROPERTIES);
 993
 994         if (!OSSL_PARAM_get_utf8_string(p, &pmdname, sizeof(mdname)))
 995             return 0;
 996         if (propsp != NULL
 997             && !OSSL_PARAM_get_utf8_string(propsp, &pmdprops, sizeof(mdprops)))
 998             return 0;
 999
1000         if (prsactx->pad_mode != RSA_PKCS1_PSS_PADDING) {
1001             ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_MGF1_MD);
1002             return  0;
1003         }
1004
1005         /* TODO(3.0) PSS check needs more work */
1006         if (rsa_pss_restricted(prsactx)) {
1007             /* TODO(3.0) figure out what to do for prsactx->md == NULL */
1008             if (prsactx->mgf1_md == NULL
1009                 || EVP_MD_is_a(prsactx->mgf1_md, mdname))
1010                 return 1;
1011             ERR_raise(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED);
1012             return 0;
1013         }
1014
1015         /* non-PSS code follows */
1016         if (!rsa_setup_mgf1_md(prsactx, mdname, mdprops))
1017             return 0;
1018     }
1019
1020     return 1;
1021 }
1022
1023 static const OSSL_PARAM known_settable_ctx_params[] = {
1024     OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PAD_MODE, NULL, 0),
1025     OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
1026     OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PROPERTIES, NULL, 0),
1027     OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_MGF1_DIGEST, NULL, 0),
1028     OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_MGF1_PROPERTIES, NULL, 0),
1029     OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PSS_SALTLEN, NULL, 0),
1030     OSSL_PARAM_END
1031 };
1032
1033 static const OSSL_PARAM *rsa_settable_ctx_params(void)
1034 {
1035     /*
1036      * TODO(3.0): Should this function return a different set of settable ctx
1037      * params if the ctx is being used for a DigestSign/DigestVerify? In that
1038      * case it is not allowed to set the digest size/digest name because the
1039      * digest is explicitly set as part of the init.
1040      */
1041     return known_settable_ctx_params;
1042 }
1043
1044 static int rsa_get_ctx_md_params(void *vprsactx, OSSL_PARAM *params)
1045 {
1046     PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
1047
1048     if (prsactx->mdctx == NULL)
1049         return 0;
1050
1051     return EVP_MD_CTX_get_params(prsactx->mdctx, params);
1052 }
1053
1054 static const OSSL_PARAM *rsa_gettable_ctx_md_params(void *vprsactx)
1055 {
1056     PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
1057
1058     if (prsactx->md == NULL)
1059         return 0;
1060
1061     return EVP_MD_gettable_ctx_params(prsactx->md);
1062 }
1063
1064 static int rsa_set_ctx_md_params(void *vprsactx, const OSSL_PARAM params[])
1065 {
1066     PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
1067
1068     if (prsactx->mdctx == NULL)
1069         return 0;
1070
1071     return EVP_MD_CTX_set_params(prsactx->mdctx, params);
1072 }
1073
1074 static const OSSL_PARAM *rsa_settable_ctx_md_params(void *vprsactx)
1075 {
1076     PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
1077
1078     if (prsactx->md == NULL)
1079         return 0;
1080
1081     return EVP_MD_settable_ctx_params(prsactx->md);
1082 }
1083
1084 const OSSL_DISPATCH rsa_signature_functions[] = {
1085     { OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))rsa_newctx },
1086     { OSSL_FUNC_SIGNATURE_SIGN_INIT, (void (*)(void))rsa_signature_init },
1087     { OSSL_FUNC_SIGNATURE_SIGN, (void (*)(void))rsa_sign },
1088     { OSSL_FUNC_SIGNATURE_VERIFY_INIT, (void (*)(void))rsa_signature_init },
1089     { OSSL_FUNC_SIGNATURE_VERIFY, (void (*)(void))rsa_verify },
1090     { OSSL_FUNC_SIGNATURE_VERIFY_RECOVER_INIT, (void (*)(void))rsa_signature_init },
1091     { OSSL_FUNC_SIGNATURE_VERIFY_RECOVER, (void (*)(void))rsa_verify_recover },
1092     { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,
1093       (void (*)(void))rsa_digest_signverify_init },
1094     { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_UPDATE,
1095       (void (*)(void))rsa_digest_signverify_update },
1096     { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_FINAL,
1097       (void (*)(void))rsa_digest_sign_final },
1098     { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT,
1099       (void (*)(void))rsa_digest_signverify_init },
1100     { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_UPDATE,
1101       (void (*)(void))rsa_digest_signverify_update },
1102     { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_FINAL,
1103       (void (*)(void))rsa_digest_verify_final },
1104     { OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))rsa_freectx },
1105     { OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))rsa_dupctx },
1106     { OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS, (void (*)(void))rsa_get_ctx_params },
1107     { OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS,
1108       (void (*)(void))rsa_gettable_ctx_params },
1109     { OSSL_FUNC_SIGNATURE_SET_CTX_PARAMS, (void (*)(void))rsa_set_ctx_params },
1110     { OSSL_FUNC_SIGNATURE_SETTABLE_CTX_PARAMS,
1111       (void (*)(void))rsa_settable_ctx_params },
1112     { OSSL_FUNC_SIGNATURE_GET_CTX_MD_PARAMS,
1113       (void (*)(void))rsa_get_ctx_md_params },
1114     { OSSL_FUNC_SIGNATURE_GETTABLE_CTX_MD_PARAMS,
1115       (void (*)(void))rsa_gettable_ctx_md_params },
1116     { OSSL_FUNC_SIGNATURE_SET_CTX_MD_PARAMS,
1117       (void (*)(void))rsa_set_ctx_md_params },
1118     { OSSL_FUNC_SIGNATURE_SETTABLE_CTX_MD_PARAMS,
1119       (void (*)(void))rsa_settable_ctx_md_params },
1120     { 0, NULL }
1121 };