Cryptlib/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         ASN1err(ASN1_F_ASN1_VERIFY, ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
  90         goto err;
  91     }
  92
  93     if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) {
  94         ASN1err(ASN1_F_ASN1_VERIFY, ASN1_R_INVALID_BIT_STRING_BITS_LEFT);
  95         goto err;
  96     }
  97
  98     inl = i2d(data, NULL);
  99     buf_in = OPENSSL_malloc((unsigned int)inl);
 100     if (buf_in == NULL) {
 101         ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_MALLOC_FAILURE);
 102         goto err;
 103     }
 104     p = buf_in;
 105
 106     i2d(data, &p);
 107     if (!EVP_VerifyInit_ex(&ctx, type, NULL)
 108         || !EVP_VerifyUpdate(&ctx, (unsigned char *)buf_in, inl)) {
 109         ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_EVP_LIB);
 110         ret = 0;
 111         goto err;
 112     }
 113
 114     OPENSSL_cleanse(buf_in, (unsigned int)inl);
 115     OPENSSL_free(buf_in);
 116
 117     if (EVP_VerifyFinal(&ctx, (unsigned char *)signature->data,
 118                         (unsigned int)signature->length, pkey) <= 0) {
 119         ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_EVP_LIB);
 120         ret = 0;
 121         goto err;
 122     }
 123     /*
 124      * we don't need to zero the 'ctx' because we just checked public
 125      * information
 126      */
 127     /* memset(&ctx,0,sizeof(ctx)); */
 128     ret = 1;
 129  err:
 130     EVP_MD_CTX_cleanup(&ctx);
 131     return (ret);
 132 }
 133
 134 #endif
 135
 136 int ASN1_item_verify(const ASN1_ITEM *it, X509_ALGOR *a,
 137                      ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey)
 138 {
 139     EVP_MD_CTX ctx;
 140     unsigned char *buf_in = NULL;
 141     int ret = -1, inl;
 142
 143     int mdnid, pknid;
 144
 145     if (!pkey) {
 146         ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_PASSED_NULL_PARAMETER);
 147         return -1;
 148     }
 149
 150     if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) {
 151         ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_INVALID_BIT_STRING_BITS_LEFT);
 152         return -1;
 153     }
 154
 155     EVP_MD_CTX_init(&ctx);
 156
 157     /* Convert signature OID into digest and public key OIDs */
 158     if (!OBJ_find_sigid_algs(OBJ_obj2nid(a->algorithm), &mdnid, &pknid)) {
 159         ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
 160         goto err;
 161     }
 162     if (mdnid == NID_undef) {
 163         if (!pkey->ameth || !pkey->ameth->item_verify) {
 164             ASN1err(ASN1_F_ASN1_ITEM_VERIFY,
 165                     ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
 166             goto err;
 167         }
 168         ret = pkey->ameth->item_verify(&ctx, it, asn, a, signature, pkey);
 169         /*
 170          * Return value of 2 means carry on, anything else means we exit
 171          * straight away: either a fatal error of the underlying verification
 172          * routine handles all verification.
 173          */
 174         if (ret != 2)
 175             goto err;
 176         ret = -1;
 177     } else {
 178         const EVP_MD *type;
 179         type = EVP_get_digestbynid(mdnid);
 180         if (type == NULL) {
 181             ASN1err(ASN1_F_ASN1_ITEM_VERIFY,
 182                     ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
 183             goto err;
 184         }
 185
 186         /* Check public key OID matches public key type */
 187         if (EVP_PKEY_type(pknid) != pkey->ameth->pkey_id) {
 188             ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_WRONG_PUBLIC_KEY_TYPE);
 189             goto err;
 190         }
 191
 192         if (!EVP_DigestVerifyInit(&ctx, NULL, type, NULL, pkey)) {
 193             ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_EVP_LIB);
 194             ret = 0;
 195             goto err;
 196         }
 197
 198     }
 199
 200     inl = ASN1_item_i2d(asn, &buf_in, it);
 201
 202     if (buf_in == NULL) {
 203         ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_MALLOC_FAILURE);
 204         goto err;
 205     }
 206
 207     if (!EVP_DigestVerifyUpdate(&ctx, buf_in, inl)) {
 208         ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_EVP_LIB);
 209         ret = 0;
 210         goto err;
 211     }
 212
 213     OPENSSL_cleanse(buf_in, (unsigned int)inl);
 214     OPENSSL_free(buf_in);
 215
 216     if (EVP_DigestVerifyFinal(&ctx, signature->data,
 217                               (size_t)signature->length) <= 0) {
 218         ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_EVP_LIB);
 219         ret = 0;
 220         goto err;
 221     }
 222     /*
 223      * we don't need to zero the 'ctx' because we just checked public
 224      * information
 225      */
 226     /* memset(&ctx,0,sizeof(ctx)); */
 227     ret = 1;
 228  err:
 229     EVP_MD_CTX_cleanup(&ctx);
 230     return (ret);
 231 }