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 "internal/cryptlib.h"
  63
  64 #ifndef NO_SYS_TYPES_H
  65 # include <sys/types.h>
  66 #endif
  67
  68 #include <openssl/bn.h>
  69 #include <openssl/x509.h>
  70 #include <openssl/objects.h>
  71 #include <openssl/buffer.h>
  72 #include <openssl/evp.h>
  73 #include "internal/asn1_int.h"
  74 #include "internal/evp_int.h"
  75
  76 #ifndef NO_ASN1_OLD
  77
  78 int ASN1_verify(i2d_of_void *i2d, X509_ALGOR *a, ASN1_BIT_STRING *signature,
  79                 char *data, EVP_PKEY *pkey)
  80 {
  81     EVP_MD_CTX *ctx = EVP_MD_CTX_new();
  82     const EVP_MD *type;
  83     unsigned char *p, *buf_in = NULL;
  84     int ret = -1, i, inl;
  85
  86     if (ctx == NULL) {
  87         ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_MALLOC_FAILURE);
  88         goto err;
  89     }
  90     i = OBJ_obj2nid(a->algorithm);
  91     type = EVP_get_digestbyname(OBJ_nid2sn(i));
  92     if (type == NULL) {
  93         ASN1err(ASN1_F_ASN1_VERIFY, ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
  94         goto err;
  95     }
  96
  97     if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) {
  98         ASN1err(ASN1_F_ASN1_VERIFY, ASN1_R_INVALID_BIT_STRING_BITS_LEFT);
  99         goto err;
 100     }
 101
 102     inl = i2d(data, NULL);
 103     buf_in = OPENSSL_malloc((unsigned int)inl);
 104     if (buf_in == NULL) {
 105         ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_MALLOC_FAILURE);
 106         goto err;
 107     }
 108     p = buf_in;
 109
 110     i2d(data, &p);
 111     ret = EVP_VerifyInit_ex(ctx, type, NULL)
 112         && EVP_VerifyUpdate(ctx, (unsigned char *)buf_in, inl);
 113
 114     OPENSSL_clear_free(buf_in, (unsigned int)inl);
 115
 116     if (!ret) {
 117         ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_EVP_LIB);
 118         goto err;
 119     }
 120     ret = -1;
 121
 122     if (EVP_VerifyFinal(ctx, (unsigned char *)signature->data,
 123                         (unsigned int)signature->length, pkey) <= 0) {
 124         ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_EVP_LIB);
 125         ret = 0;
 126         goto err;
 127     }
 128     ret = 1;
 129  err:
 130     EVP_MD_CTX_free(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 = NULL;
 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     ctx = EVP_MD_CTX_new();
 156     if (ctx == NULL) {
 157         ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_MALLOC_FAILURE);
 158         goto err;
 159     }
 160
 161     /* Convert signature OID into digest and public key OIDs */
 162     if (!OBJ_find_sigid_algs(OBJ_obj2nid(a->algorithm), &mdnid, &pknid)) {
 163         ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
 164         goto err;
 165     }
 166     if (mdnid == NID_undef) {
 167         if (!pkey->ameth || !pkey->ameth->item_verify) {
 168             ASN1err(ASN1_F_ASN1_ITEM_VERIFY,
 169                     ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
 170             goto err;
 171         }
 172         ret = pkey->ameth->item_verify(ctx, it, asn, a, signature, pkey);
 173         /*
 174          * Return value of 2 means carry on, anything else means we exit
 175          * straight away: either a fatal error of the underlying verification
 176          * routine handles all verification.
 177          */
 178         if (ret != 2)
 179             goto err;
 180         ret = -1;
 181     } else {
 182         const EVP_MD *type;
 183         type = EVP_get_digestbynid(mdnid);
 184         if (type == NULL) {
 185             ASN1err(ASN1_F_ASN1_ITEM_VERIFY,
 186                     ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
 187             goto err;
 188         }
 189
 190         /* Check public key OID matches public key type */
 191         if (EVP_PKEY_type(pknid) != pkey->ameth->pkey_id) {
 192             ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_WRONG_PUBLIC_KEY_TYPE);
 193             goto err;
 194         }
 195
 196         if (!EVP_DigestVerifyInit(ctx, NULL, type, NULL, pkey)) {
 197             ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_EVP_LIB);
 198             ret = 0;
 199             goto err;
 200         }
 201
 202     }
 203
 204     inl = ASN1_item_i2d(asn, &buf_in, it);
 205
 206     if (buf_in == NULL) {
 207         ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_MALLOC_FAILURE);
 208         goto err;
 209     }
 210
 211     ret = EVP_DigestVerifyUpdate(ctx, buf_in, inl);
 212
 213     OPENSSL_clear_free(buf_in, (unsigned int)inl);
 214
 215     if (!ret) {
 216         ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_EVP_LIB);
 217         goto err;
 218     }
 219     ret = -1;
 220
 221     if (EVP_DigestVerifyFinal(ctx, signature->data,
 222                               (size_t)signature->length) <= 0) {
 223         ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_EVP_LIB);
 224         ret = 0;
 225         goto err;
 226     }
 227     ret = 1;
 228  err:
 229     EVP_MD_CTX_free(ctx);
 230     return (ret);
 231 }