235 lines
6.8 KiB
C
235 lines
6.8 KiB
C
/* crypto/asn1/a_verify.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <stdio.h>
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#include <time.h>
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#include "cryptlib.h"
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#include "asn1_locl.h"
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#ifndef NO_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#include <openssl/bn.h>
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#include <openssl/x509.h>
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#include <openssl/objects.h>
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#include <openssl/buffer.h>
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#include <openssl/evp.h>
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#ifndef NO_ASN1_OLD
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int ASN1_verify(i2d_of_void *i2d, X509_ALGOR *a, ASN1_BIT_STRING *signature,
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char *data, EVP_PKEY *pkey)
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{
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EVP_MD_CTX ctx;
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const EVP_MD *type;
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unsigned char *p,*buf_in=NULL;
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int ret= -1,i,inl;
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EVP_MD_CTX_init(&ctx);
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i=OBJ_obj2nid(a->algorithm);
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type=EVP_get_digestbyname(OBJ_nid2sn(i));
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if (type == NULL)
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{
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ASN1err(ASN1_F_ASN1_VERIFY,ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
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goto err;
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}
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inl=i2d(data,NULL);
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buf_in=OPENSSL_malloc((unsigned int)inl);
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if (buf_in == NULL)
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{
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ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_MALLOC_FAILURE);
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goto err;
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}
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p=buf_in;
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i2d(data,&p);
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if (!EVP_VerifyInit_ex(&ctx,type, NULL)
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|| !EVP_VerifyUpdate(&ctx,(unsigned char *)buf_in,inl))
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{
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ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_EVP_LIB);
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ret=0;
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goto err;
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}
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OPENSSL_cleanse(buf_in,(unsigned int)inl);
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OPENSSL_free(buf_in);
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if (EVP_VerifyFinal(&ctx,(unsigned char *)signature->data,
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(unsigned int)signature->length,pkey) <= 0)
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{
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ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_EVP_LIB);
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ret=0;
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goto err;
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}
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/* we don't need to zero the 'ctx' because we just checked
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* public information */
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/* memset(&ctx,0,sizeof(ctx)); */
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ret=1;
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err:
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EVP_MD_CTX_cleanup(&ctx);
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return(ret);
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}
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#endif
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int ASN1_item_verify(const ASN1_ITEM *it, X509_ALGOR *a,
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ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey)
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{
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EVP_MD_CTX ctx;
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unsigned char *buf_in=NULL;
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int ret= -1,inl;
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int mdnid, pknid;
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if (!pkey)
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{
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ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_PASSED_NULL_PARAMETER);
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return -1;
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}
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EVP_MD_CTX_init(&ctx);
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/* Convert signature OID into digest and public key OIDs */
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if (!OBJ_find_sigid_algs(OBJ_obj2nid(a->algorithm), &mdnid, &pknid))
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{
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ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
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goto err;
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}
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if (mdnid == NID_undef)
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{
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if (!pkey->ameth || !pkey->ameth->item_verify)
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{
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ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
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goto err;
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}
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ret = pkey->ameth->item_verify(&ctx, it, asn, a,
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signature, pkey);
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/* Return value of 2 means carry on, anything else means we
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* exit straight away: either a fatal error of the underlying
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* verification routine handles all verification.
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*/
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if (ret != 2)
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goto err;
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ret = -1;
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}
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else
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{
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const EVP_MD *type;
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type=EVP_get_digestbynid(mdnid);
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if (type == NULL)
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{
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ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
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goto err;
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}
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/* Check public key OID matches public key type */
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if (EVP_PKEY_type(pknid) != pkey->ameth->pkey_id)
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{
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ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_WRONG_PUBLIC_KEY_TYPE);
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goto err;
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}
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if (!EVP_DigestVerifyInit(&ctx, NULL, type, NULL, pkey))
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{
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ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB);
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ret=0;
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goto err;
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}
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}
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inl = ASN1_item_i2d(asn, &buf_in, it);
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if (buf_in == NULL)
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{
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ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (!EVP_DigestVerifyUpdate(&ctx,buf_in,inl))
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{
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ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB);
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ret=0;
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goto err;
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}
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OPENSSL_cleanse(buf_in,(unsigned int)inl);
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OPENSSL_free(buf_in);
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if (EVP_DigestVerifyFinal(&ctx,signature->data,
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(size_t)signature->length) <= 0)
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{
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ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB);
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ret=0;
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goto err;
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}
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/* we don't need to zero the 'ctx' because we just checked
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* public information */
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/* memset(&ctx,0,sizeof(ctx)); */
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ret=1;
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err:
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EVP_MD_CTX_cleanup(&ctx);
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return(ret);
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}
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