release/src/router/openssl/crypto/asn1/a_verify.c

   1 /* crypto/asn1/a_verify.c */
   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 #include <stdio.h>
  60 #include <time.h>
  61
  62 #include "cryptlib.h"
  63 #include "asn1_locl.h"
  64
  65 #ifndef NO_SYS_TYPES_H
  66 # include <sys/types.h>
  67 #endif
  68
  69 #include <openssl/bn.h>
  70 #include <openssl/x509.h>
  71 #include <openssl/objects.h>
  72 #include <openssl/buffer.h>
  73 #include <openssl/evp.h>
  74
  75 #ifndef NO_ASN1_OLD
  76
  77 int ASN1_verify(i2d_of_void *i2d, X509_ALGOR *a, ASN1_BIT_STRING *signature,
  78                 char *data, EVP_PKEY *pkey)
  79         {
  80         EVP_MD_CTX ctx;
  81         const EVP_MD *type;
  82         unsigned char *p,*buf_in=NULL;
  83         int ret= -1,i,inl;
  84
  85         EVP_MD_CTX_init(&ctx);
  86         i=OBJ_obj2nid(a->algorithm);
  87         type=EVP_get_digestbyname(OBJ_nid2sn(i));
  88         if (type == NULL)
  89                 {
  90                 ASN1err(ASN1_F_ASN1_VERIFY,ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
  91                 goto err;
  92                 }
  93
  94         inl=i2d(data,NULL);
  95         buf_in=OPENSSL_malloc((unsigned int)inl);
  96         if (buf_in == NULL)
  97                 {
  98                 ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_MALLOC_FAILURE);
  99                 goto err;
 100                 }
 101         p=buf_in;
 102
 103         i2d(data,&p);
 104         if (!EVP_VerifyInit_ex(&ctx,type, NULL)
 105                 || !EVP_VerifyUpdate(&ctx,(unsigned char *)buf_in,inl))
 106                 {
 107                 ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_EVP_LIB);
 108                 ret=0;
 109                 goto err;
 110                 }
 111
 112         OPENSSL_cleanse(buf_in,(unsigned int)inl);
 113         OPENSSL_free(buf_in);
 114
 115         if (EVP_VerifyFinal(&ctx,(unsigned char *)signature->data,
 116                         (unsigned int)signature->length,pkey) <= 0)
 117                 {
 118                 ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_EVP_LIB);
 119                 ret=0;
 120                 goto err;
 121                 }
 122         /* we don't need to zero the 'ctx' because we just checked
 123          * public information */
 124         /* memset(&ctx,0,sizeof(ctx)); */
 125         ret=1;
 126 err:
 127         EVP_MD_CTX_cleanup(&ctx);
 128         return(ret);
 129         }
 130
 131 #endif
 132
 133
 134 int ASN1_item_verify(const ASN1_ITEM *it, X509_ALGOR *a,
 135                 ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey)
 136         {
 137         EVP_MD_CTX ctx;
 138         unsigned char *buf_in=NULL;
 139         int ret= -1,inl;
 140
 141         int mdnid, pknid;
 142
 143         EVP_MD_CTX_init(&ctx);
 144
 145         /* Convert signature OID into digest and public key OIDs */
 146         if (!OBJ_find_sigid_algs(OBJ_obj2nid(a->algorithm), &mdnid, &pknid))
 147                 {
 148                 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
 149                 goto err;
 150                 }
 151         if (mdnid == NID_undef)
 152                 {
 153                 if (!pkey->ameth || !pkey->ameth->item_verify)
 154                         {
 155                         ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
 156                         goto err;
 157                         }
 158                 ret = pkey->ameth->item_verify(&ctx, it, asn, a,
 159                                                         signature, pkey);
 160                 /* Return value of 2 means carry on, anything else means we
 161                  * exit straight away: either a fatal error of the underlying
 162                  * verification routine handles all verification.
 163                  */
 164                 if (ret != 2)
 165                         goto err;
 166                 ret = -1;
 167                 }
 168         else
 169                 {
 170                 const EVP_MD *type;
 171                 type=EVP_get_digestbynid(mdnid);
 172                 if (type == NULL)
 173                         {
 174                         ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
 175                         goto err;
 176                         }
 177
 178                 /* Check public key OID matches public key type */
 179                 if (EVP_PKEY_type(pknid) != pkey->ameth->pkey_id)
 180                         {
 181                         ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_WRONG_PUBLIC_KEY_TYPE);
 182                         goto err;
 183                         }
 184
 185                 if (!EVP_DigestVerifyInit(&ctx, NULL, type, NULL, pkey))
 186                         {
 187                         ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB);
 188                         ret=0;
 189                         goto err;
 190                         }
 191
 192                 }
 193
 194         inl = ASN1_item_i2d(asn, &buf_in, it);
 195
 196         if (buf_in == NULL)
 197                 {
 198                 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_MALLOC_FAILURE);
 199                 goto err;
 200                 }
 201
 202         if (!EVP_DigestVerifyUpdate(&ctx,buf_in,inl))
 203                 {
 204                 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB);
 205                 ret=0;
 206                 goto err;
 207                 }
 208
 209         OPENSSL_cleanse(buf_in,(unsigned int)inl);
 210         OPENSSL_free(buf_in);
 211
 212         if (EVP_DigestVerifyFinal(&ctx,signature->data,
 213                         (size_t)signature->length) <= 0)
 214                 {
 215                 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB);
 216                 ret=0;
 217                 goto err;
 218                 }
 219         /* we don't need to zero the 'ctx' because we just checked
 220          * public information */
 221         /* memset(&ctx,0,sizeof(ctx)); */
 222         ret=1;
 223 err:
 224         EVP_MD_CTX_cleanup(&ctx);
 225         return(ret);
 226         }
 227
 228