lib/libcrypto/evp/pmeth_fn.c

   1 /* $OpenBSD: pmeth_fn.c,v 1.6 2017/01/29 17:49:23 beck Exp $ */
   2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
   3  * project 2006.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59 #include <stdio.h>
  60 #include <stdlib.h>
  61
  62 #include <openssl/err.h>
  63 #include <openssl/evp.h>
  64 #include <openssl/objects.h>
  65
  66 #include "evp_locl.h"
  67
  68 #define M_check_autoarg(ctx, arg, arglen, err) \
  69         if (ctx->pmeth->flags & EVP_PKEY_FLAG_AUTOARGLEN) \
  70                 { \
  71                 size_t pksize = (size_t)EVP_PKEY_size(ctx->pkey); \
  72                 if (!arg) \
  73                         { \
  74                         *arglen = pksize; \
  75                         return 1; \
  76                         } \
  77                 else if (*arglen < pksize) \
  78                         { \
  79                         EVPerror(EVP_R_BUFFER_TOO_SMALL); /*ckerr_ignore*/\
  80                         return 0; \
  81                         } \
  82                 }
  83
  84 int
  85 EVP_PKEY_sign_init(EVP_PKEY_CTX *ctx)
  86 {
  87         int ret;
  88
  89         if (!ctx || !ctx->pmeth || !ctx->pmeth->sign) {
  90                 EVPerror(EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
  91                 return -2;
  92         }
  93         ctx->operation = EVP_PKEY_OP_SIGN;
  94         if (!ctx->pmeth->sign_init)
  95                 return 1;
  96         ret = ctx->pmeth->sign_init(ctx);
  97         if (ret <= 0)
  98                 ctx->operation = EVP_PKEY_OP_UNDEFINED;
  99         return ret;
 100 }
 101
 102 int
 103 EVP_PKEY_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
 104     const unsigned char *tbs, size_t tbslen)
 105 {
 106         if (!ctx || !ctx->pmeth || !ctx->pmeth->sign) {
 107                 EVPerror(EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 108                 return -2;
 109         }
 110         if (ctx->operation != EVP_PKEY_OP_SIGN) {
 111                 EVPerror(EVP_R_OPERATON_NOT_INITIALIZED);
 112                 return -1;
 113         }
 114         M_check_autoarg(ctx, sig, siglen, EVP_F_EVP_PKEY_SIGN)
 115         return ctx->pmeth->sign(ctx, sig, siglen, tbs, tbslen);
 116 }
 117
 118 int
 119 EVP_PKEY_verify_init(EVP_PKEY_CTX *ctx)
 120 {
 121         int ret;
 122
 123         if (!ctx || !ctx->pmeth || !ctx->pmeth->verify) {
 124                 EVPerror(EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 125                 return -2;
 126         }
 127         ctx->operation = EVP_PKEY_OP_VERIFY;
 128         if (!ctx->pmeth->verify_init)
 129                 return 1;
 130         ret = ctx->pmeth->verify_init(ctx);
 131         if (ret <= 0)
 132                 ctx->operation = EVP_PKEY_OP_UNDEFINED;
 133         return ret;
 134 }
 135
 136 int
 137 EVP_PKEY_verify(EVP_PKEY_CTX *ctx, const unsigned char *sig, size_t siglen,
 138     const unsigned char *tbs, size_t tbslen)
 139 {
 140         if (!ctx || !ctx->pmeth || !ctx->pmeth->verify) {
 141                 EVPerror(EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 142                 return -2;
 143         }
 144         if (ctx->operation != EVP_PKEY_OP_VERIFY) {
 145                 EVPerror(EVP_R_OPERATON_NOT_INITIALIZED);
 146                 return -1;
 147         }
 148         return ctx->pmeth->verify(ctx, sig, siglen, tbs, tbslen);
 149 }
 150
 151 int
 152 EVP_PKEY_verify_recover_init(EVP_PKEY_CTX *ctx)
 153 {
 154         int ret;
 155
 156         if (!ctx || !ctx->pmeth || !ctx->pmeth->verify_recover) {
 157                 EVPerror(EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 158                 return -2;
 159         }
 160         ctx->operation = EVP_PKEY_OP_VERIFYRECOVER;
 161         if (!ctx->pmeth->verify_recover_init)
 162                 return 1;
 163         ret = ctx->pmeth->verify_recover_init(ctx);
 164         if (ret <= 0)
 165                 ctx->operation = EVP_PKEY_OP_UNDEFINED;
 166         return ret;
 167 }
 168
 169 int
 170 EVP_PKEY_verify_recover(EVP_PKEY_CTX *ctx, unsigned char *rout, size_t *routlen,
 171     const unsigned char *sig, size_t siglen)
 172 {
 173         if (!ctx || !ctx->pmeth || !ctx->pmeth->verify_recover) {
 174                 EVPerror(EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 175                 return -2;
 176         }
 177         if (ctx->operation != EVP_PKEY_OP_VERIFYRECOVER) {
 178                 EVPerror(EVP_R_OPERATON_NOT_INITIALIZED);
 179                 return -1;
 180         }
 181         M_check_autoarg(ctx, rout, routlen, EVP_F_EVP_PKEY_VERIFY_RECOVER)
 182         return ctx->pmeth->verify_recover(ctx, rout, routlen, sig, siglen);
 183 }
 184
 185 int
 186 EVP_PKEY_encrypt_init(EVP_PKEY_CTX *ctx)
 187 {
 188         int ret;
 189
 190         if (!ctx || !ctx->pmeth || !ctx->pmeth->encrypt) {
 191                 EVPerror(EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 192                 return -2;
 193         }
 194         ctx->operation = EVP_PKEY_OP_ENCRYPT;
 195         if (!ctx->pmeth->encrypt_init)
 196                 return 1;
 197         ret = ctx->pmeth->encrypt_init(ctx);
 198         if (ret <= 0)
 199                 ctx->operation = EVP_PKEY_OP_UNDEFINED;
 200         return ret;
 201 }
 202
 203 int
 204 EVP_PKEY_encrypt(EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen,
 205     const unsigned char *in, size_t inlen)
 206 {
 207         if (!ctx || !ctx->pmeth || !ctx->pmeth->encrypt) {
 208                 EVPerror(EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 209                 return -2;
 210         }
 211         if (ctx->operation != EVP_PKEY_OP_ENCRYPT) {
 212                 EVPerror(EVP_R_OPERATON_NOT_INITIALIZED);
 213                 return -1;
 214         }
 215         M_check_autoarg(ctx, out, outlen, EVP_F_EVP_PKEY_ENCRYPT)
 216         return ctx->pmeth->encrypt(ctx, out, outlen, in, inlen);
 217 }
 218
 219 int
 220 EVP_PKEY_decrypt_init(EVP_PKEY_CTX *ctx)
 221 {
 222         int ret;
 223
 224         if (!ctx || !ctx->pmeth || !ctx->pmeth->decrypt) {
 225                 EVPerror(EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 226                 return -2;
 227         }
 228         ctx->operation = EVP_PKEY_OP_DECRYPT;
 229         if (!ctx->pmeth->decrypt_init)
 230                 return 1;
 231         ret = ctx->pmeth->decrypt_init(ctx);
 232         if (ret <= 0)
 233                 ctx->operation = EVP_PKEY_OP_UNDEFINED;
 234         return ret;
 235 }
 236
 237 int
 238 EVP_PKEY_decrypt(EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen,
 239     const unsigned char *in, size_t inlen)
 240 {
 241         if (!ctx || !ctx->pmeth || !ctx->pmeth->decrypt) {
 242                 EVPerror(EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 243                 return -2;
 244         }
 245         if (ctx->operation != EVP_PKEY_OP_DECRYPT) {
 246                 EVPerror(EVP_R_OPERATON_NOT_INITIALIZED);
 247                 return -1;
 248         }
 249         M_check_autoarg(ctx, out, outlen, EVP_F_EVP_PKEY_DECRYPT)
 250         return ctx->pmeth->decrypt(ctx, out, outlen, in, inlen);
 251 }
 252
 253 int
 254 EVP_PKEY_derive_init(EVP_PKEY_CTX *ctx)
 255 {
 256         int ret;
 257
 258         if (!ctx || !ctx->pmeth || !ctx->pmeth->derive) {
 259                 EVPerror(EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 260                 return -2;
 261         }
 262         ctx->operation = EVP_PKEY_OP_DERIVE;
 263         if (!ctx->pmeth->derive_init)
 264                 return 1;
 265         ret = ctx->pmeth->derive_init(ctx);
 266         if (ret <= 0)
 267                 ctx->operation = EVP_PKEY_OP_UNDEFINED;
 268         return ret;
 269 }
 270
 271 int
 272 EVP_PKEY_derive_set_peer(EVP_PKEY_CTX *ctx, EVP_PKEY *peer)
 273 {
 274         int ret;
 275
 276         if (!ctx || !ctx->pmeth || !(ctx->pmeth->derive ||
 277             ctx->pmeth->encrypt || ctx->pmeth->decrypt) ||
 278             !ctx->pmeth->ctrl) {
 279                 EVPerror(EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 280                 return -2;
 281         }
 282         if (ctx->operation != EVP_PKEY_OP_DERIVE &&
 283             ctx->operation != EVP_PKEY_OP_ENCRYPT &&
 284             ctx->operation != EVP_PKEY_OP_DECRYPT) {
 285                 EVPerror(EVP_R_OPERATON_NOT_INITIALIZED);
 286                 return -1;
 287         }
 288
 289         ret = ctx->pmeth->ctrl(ctx, EVP_PKEY_CTRL_PEER_KEY, 0, peer);
 290
 291         if (ret <= 0)
 292                 return ret;
 293
 294         if (ret == 2)
 295                 return 1;
 296
 297         if (!ctx->pkey) {
 298                 EVPerror(EVP_R_NO_KEY_SET);
 299                 return -1;
 300         }
 301
 302         if (ctx->pkey->type != peer->type) {
 303                 EVPerror(EVP_R_DIFFERENT_KEY_TYPES);
 304                 return -1;
 305         }
 306
 307         /* ran@cryptocom.ru: For clarity.  The error is if parameters in peer are
 308          * present (!missing) but don't match.  EVP_PKEY_cmp_parameters may return
 309          * 1 (match), 0 (don't match) and -2 (comparison is not defined).  -1
 310          * (different key types) is impossible here because it is checked earlier.
 311          * -2 is OK for us here, as well as 1, so we can check for 0 only. */
 312         if (!EVP_PKEY_missing_parameters(peer) &&
 313             !EVP_PKEY_cmp_parameters(ctx->pkey, peer)) {
 314                 EVPerror(EVP_R_DIFFERENT_PARAMETERS);
 315                 return -1;
 316         }
 317
 318         EVP_PKEY_free(ctx->peerkey);
 319         ctx->peerkey = peer;
 320
 321         ret = ctx->pmeth->ctrl(ctx, EVP_PKEY_CTRL_PEER_KEY, 1, peer);
 322
 323         if (ret <= 0) {
 324                 ctx->peerkey = NULL;
 325                 return ret;
 326         }
 327
 328         CRYPTO_add(&peer->references, 1, CRYPTO_LOCK_EVP_PKEY);
 329         return 1;
 330 }
 331
 332 int
 333 EVP_PKEY_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *pkeylen)
 334 {
 335         if (!ctx || !ctx->pmeth || !ctx->pmeth->derive) {
 336                 EVPerror(EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 337                 return -2;
 338         }
 339         if (ctx->operation != EVP_PKEY_OP_DERIVE) {
 340                 EVPerror(EVP_R_OPERATON_NOT_INITIALIZED);
 341                 return -1;
 342         }
 343         M_check_autoarg(ctx, key, pkeylen, EVP_F_EVP_PKEY_DERIVE)
 344         return ctx->pmeth->derive(ctx, key, pkeylen);
 345 }