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         EVP_VerifyInit_ex(&ctx,type, NULL);
 105         EVP_VerifyUpdate(&ctx,(unsigned char *)buf_in,inl);
 106
 107         OPENSSL_cleanse(buf_in,(unsigned int)inl);
 108         OPENSSL_free(buf_in);
 109
 110         if (EVP_VerifyFinal(&ctx,(unsigned char *)signature->data,
 111                         (unsigned int)signature->length,pkey) <= 0)
 112                 {
 113                 ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_EVP_LIB);
 114                 ret=0;
 115                 goto err;
 116                 }
 117         /* we don't need to zero the 'ctx' because we just checked
 118          * public information */
 119         /* memset(&ctx,0,sizeof(ctx)); */
 120         ret=1;
 121 err:
 122         EVP_MD_CTX_cleanup(&ctx);
 123         return(ret);
 124         }
 125
 126 #endif
 127
 128
 129 int ASN1_item_verify(const ASN1_ITEM *it, X509_ALGOR *a, ASN1_BIT_STRING *signature,
 130              void *asn, EVP_PKEY *pkey)
 131         {
 132         EVP_MD_CTX ctx;
 133         const EVP_MD *type = NULL;
 134         unsigned char *buf_in=NULL;
 135         int ret= -1,inl;
 136
 137         int mdnid, pknid;
 138
 139         /* Convert signature OID into digest and public key OIDs */
 140
 141         if (!OBJ_find_sigid_algs(OBJ_obj2nid(a->algorithm), &mdnid, &pknid))
 142                 {
 143                 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
 144                 goto err;
 145                 }
 146         type=EVP_get_digestbynid(mdnid);
 147         if (type == NULL)
 148                 {
 149                 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
 150                 goto err;
 151                 }
 152
 153         /* Check public key OID matches public key type */
 154         if (EVP_PKEY_type(pknid) != pkey->ameth->pkey_id)
 155                 {
 156                 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_WRONG_PUBLIC_KEY_TYPE);
 157                 goto err;
 158                 }
 159
 160         EVP_MD_CTX_init(&ctx);
 161         if (!EVP_VerifyInit_ex(&ctx,type, NULL))
 162                 {
 163                 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB);
 164                 ret=0;
 165                 goto err;
 166                 }
 167
 168         inl = ASN1_item_i2d(asn, &buf_in, it);
 169
 170         if (buf_in == NULL)
 171                 {
 172                 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_MALLOC_FAILURE);
 173                 goto err;
 174                 }
 175
 176         EVP_VerifyUpdate(&ctx,(unsigned char *)buf_in,inl);
 177
 178         OPENSSL_cleanse(buf_in,(unsigned int)inl);
 179         OPENSSL_free(buf_in);
 180
 181         if (EVP_VerifyFinal(&ctx,(unsigned char *)signature->data,
 182                         (unsigned int)signature->length,pkey) <= 0)
 183                 {
 184                 ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB);
 185                 ret=0;
 186                 goto err;
 187                 }
 188         /* we don't need to zero the 'ctx' because we just checked
 189          * public information */
 190         /* memset(&ctx,0,sizeof(ctx)); */
 191         ret=1;
 192 err:
 193         EVP_MD_CTX_cleanup(&ctx);
 194         return(ret);
 195         }
 196
 197