crypto/libressl/crypto/asn1/a_sign.c

   1 /* $OpenBSD: a_sign.c,v 1.20 2015/07/19 18:29:31 miod Exp $ */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2003 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111
 112 #include <sys/types.h>
 113
 114 #include <stdio.h>
 115 #include <string.h>
 116 #include <time.h>
 117
 118 #include <openssl/bn.h>
 119 #include <openssl/buffer.h>
 120 #include <openssl/err.h>
 121 #include <openssl/evp.h>
 122 #include <openssl/objects.h>
 123 #include <openssl/x509.h>
 124
 125 #include "asn1_locl.h"
 126
 127 int
 128 ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1, X509_ALGOR *algor2,
 129     ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey, const EVP_MD *type)
 130 {
 131         EVP_MD_CTX ctx;
 132         EVP_MD_CTX_init(&ctx);
 133         if (!EVP_DigestSignInit(&ctx, NULL, type, NULL, pkey)) {
 134                 EVP_MD_CTX_cleanup(&ctx);
 135                 return 0;
 136         }
 137         return ASN1_item_sign_ctx(it, algor1, algor2, signature, asn, &ctx);
 138 }
 139
 140
 141 int
 142 ASN1_item_sign_ctx(const ASN1_ITEM *it, X509_ALGOR *algor1, X509_ALGOR *algor2,
 143     ASN1_BIT_STRING *signature, void *asn, EVP_MD_CTX *ctx)
 144 {
 145         const EVP_MD *type;
 146         EVP_PKEY *pkey;
 147         unsigned char *buf_in = NULL, *buf_out = NULL;
 148         size_t inl = 0, outl = 0, outll = 0;
 149         int signid, paramtype;
 150         int rv;
 151
 152         type = EVP_MD_CTX_md(ctx);
 153         pkey = EVP_PKEY_CTX_get0_pkey(ctx->pctx);
 154
 155         if (!type || !pkey) {
 156                 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX,
 157                     ASN1_R_CONTEXT_NOT_INITIALISED);
 158                 return 0;
 159         }
 160
 161         if (pkey->ameth->item_sign) {
 162                 rv = pkey->ameth->item_sign(ctx, it, asn, algor1, algor2,
 163                     signature);
 164                 if (rv == 1)
 165                         outl = signature->length;
 166                 /* Return value meanings:
 167                  * <=0: error.
 168                  *   1: method does everything.
 169                  *   2: carry on as normal.
 170                  *   3: ASN1 method sets algorithm identifiers: just sign.
 171                  */
 172                 if (rv <= 0)
 173                         ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB);
 174                 if (rv <= 1)
 175                         goto err;
 176         } else
 177                 rv = 2;
 178
 179         if (rv == 2) {
 180                 if (type->flags & EVP_MD_FLAG_PKEY_METHOD_SIGNATURE) {
 181                         if (!pkey->ameth ||
 182                             !OBJ_find_sigid_by_algs(&signid,
 183                                 EVP_MD_nid(type), pkey->ameth->pkey_id)) {
 184                                 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX,
 185                                     ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
 186                                 return 0;
 187                         }
 188                 } else
 189                         signid = type->pkey_type;
 190
 191                 if (pkey->ameth->pkey_flags & ASN1_PKEY_SIGPARAM_NULL)
 192                         paramtype = V_ASN1_NULL;
 193                 else
 194                         paramtype = V_ASN1_UNDEF;
 195
 196                 if (algor1)
 197                         X509_ALGOR_set0(algor1,
 198                             OBJ_nid2obj(signid), paramtype, NULL);
 199                 if (algor2)
 200                         X509_ALGOR_set0(algor2,
 201                             OBJ_nid2obj(signid), paramtype, NULL);
 202
 203         }
 204
 205         inl = ASN1_item_i2d(asn, &buf_in, it);
 206         outll = outl = EVP_PKEY_size(pkey);
 207         buf_out = malloc(outl);
 208         if ((buf_in == NULL) || (buf_out == NULL)) {
 209                 outl = 0;
 210                 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_MALLOC_FAILURE);
 211                 goto err;
 212         }
 213
 214         if (!EVP_DigestSignUpdate(ctx, buf_in, inl) ||
 215             !EVP_DigestSignFinal(ctx, buf_out, &outl)) {
 216                 outl = 0;
 217                 ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB);
 218                 goto err;
 219         }
 220         free(signature->data);
 221         signature->data = buf_out;
 222         buf_out = NULL;
 223         signature->length = outl;
 224         /* In the interests of compatibility, I'll make sure that
 225          * the bit string has a 'not-used bits' value of 0
 226          */
 227         signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
 228         signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 229
 230 err:
 231         EVP_MD_CTX_cleanup(ctx);
 232         if (buf_in != NULL) {
 233                 explicit_bzero((char *)buf_in, inl);
 234                 free(buf_in);
 235         }
 236         if (buf_out != NULL) {
 237                 explicit_bzero((char *)buf_out, outll);
 238                 free(buf_out);
 239         }
 240         return (outl);
 241 }