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
  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 = EVP_MD_CTX_create();
  81     const EVP_MD *type;
  82     unsigned char *p, *buf_in = NULL;
  83     int ret = -1, i, inl;
  84
  85     if (ctx == NULL) {
  86         ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_MALLOC_FAILURE);
  87         goto err;
  88     }
  89     i = OBJ_obj2nid(a->algorithm);
  90     type = EVP_get_digestbyname(OBJ_nid2sn(i));
  91     if (type == NULL) {
  92         ASN1err(ASN1_F_ASN1_VERIFY, ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
  93         goto err;
  94     }
  95
  96     if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) {
  97         ASN1err(ASN1_F_ASN1_VERIFY, ASN1_R_INVALID_BIT_STRING_BITS_LEFT);
  98         goto err;
  99     }
 100
 101     inl = i2d(data, NULL);
 102     buf_in = OPENSSL_malloc((unsigned int)inl);
 103     if (buf_in == NULL) {
 104         ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_MALLOC_FAILURE);
 105         goto err;
 106     }
 107     p = buf_in;
 108
 109     i2d(data, &p);
 110     ret = EVP_VerifyInit_ex(ctx, type, NULL)
 111         && EVP_VerifyUpdate(ctx, (unsigned char *)buf_in, inl);
 112
 113     OPENSSL_clear_free(buf_in, (unsigned int)inl);
 114
 115     if (!ret) {
 116         ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_EVP_LIB);
 117         goto err;
 118     }
 119     ret = -1;
 120
 121     if (EVP_VerifyFinal(ctx, (unsigned char *)signature->data,
 122                         (unsigned int)signature->length, pkey) <= 0) {
 123         ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_EVP_LIB);
 124         ret = 0;
 125         goto err;
 126     }
 127     ret = 1;
 128  err:
 129     EVP_MD_CTX_destroy(ctx);
 130     return (ret);
 131 }
 132
 133 #endif
 134
 135 int ASN1_item_verify(const ASN1_ITEM *it, X509_ALGOR *a,
 136                      ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey)
 137 {
 138     EVP_MD_CTX *ctx = NULL;
 139     unsigned char *buf_in = NULL;
 140     int ret = -1, inl;
 141
 142     int mdnid, pknid;
 143
 144     if (!pkey) {
 145         ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_PASSED_NULL_PARAMETER);
 146         return -1;
 147     }
 148
 149     if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) {
 150         ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_INVALID_BIT_STRING_BITS_LEFT);
 151         return -1;
 152     }
 153
 154     ctx = EVP_MD_CTX_create();
 155     if (ctx == NULL) {
 156         ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_MALLOC_FAILURE);
 157         goto err;
 158     }
 159
 160     /* Convert signature OID into digest and public key OIDs */
 161     if (!OBJ_find_sigid_algs(OBJ_obj2nid(a->algorithm), &mdnid, &pknid)) {
 162         ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
 163         goto err;
 164     }
 165     if (mdnid == NID_undef) {
 166         if (!pkey->ameth || !pkey->ameth->item_verify) {
 167             ASN1err(ASN1_F_ASN1_ITEM_VERIFY,
 168                     ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
 169             goto err;
 170         }
 171         ret = pkey->ameth->item_verify(ctx, it, asn, a, signature, pkey);
 172         /*
 173          * Return value of 2 means carry on, anything else means we exit
 174          * straight away: either a fatal error of the underlying verification
 175          * routine handles all verification.
 176          */
 177         if (ret != 2)
 178             goto err;
 179         ret = -1;
 180     } else {
 181         const EVP_MD *type;
 182         type = EVP_get_digestbynid(mdnid);
 183         if (type == NULL) {
 184             ASN1err(ASN1_F_ASN1_ITEM_VERIFY,
 185                     ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
 186             goto err;
 187         }
 188
 189         /* Check public key OID matches public key type */
 190         if (EVP_PKEY_type(pknid) != pkey->ameth->pkey_id) {
 191             ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_WRONG_PUBLIC_KEY_TYPE);
 192             goto err;
 193         }
 194
 195         if (!EVP_DigestVerifyInit(ctx, NULL, type, NULL, pkey)) {
 196             ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_EVP_LIB);
 197             ret = 0;
 198             goto err;
 199         }
 200
 201     }
 202
 203     inl = ASN1_item_i2d(asn, &buf_in, it);
 204
 205     if (buf_in == NULL) {
 206         ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_MALLOC_FAILURE);
 207         goto err;
 208     }
 209
 210     ret = EVP_DigestVerifyUpdate(ctx, buf_in, inl);
 211
 212     OPENSSL_clear_free(buf_in, (unsigned int)inl);
 213
 214     if (!ret) {
 215         ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_EVP_LIB);
 216         goto err;
 217     }
 218     ret = -1;
 219
 220     if (EVP_DigestVerifyFinal(ctx, signature->data,
 221                               (size_t)signature->length) <= 0) {
 222         ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_EVP_LIB);
 223         ret = 0;
 224         goto err;
 225     }
 226     ret = 1;
 227  err:
 228     EVP_MD_CTX_destroy(ctx);
 229     return (ret);
 230 }