/* crypto/asn1/a_verify.c */

 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

  * All rights reserved.

  *

  * This package is an SSL implementation written

  * by Eric Young (eay@cryptsoft.com).

  * The implementation was written so as to conform with Netscapes SSL.

  * 

  * This library is free for commercial and non-commercial use as long as

  * the following conditions are aheared to.  The following conditions

  * apply to all code found in this distribution, be it the RC4, RSA,

  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation

  * included with this distribution is covered by the same copyright terms

  * except that the holder is Tim Hudson (tjh@cryptsoft.com).

  * 

  * Copyright remains Eric Young's, and as such any Copyright notices in

  * the code are not to be removed.

  * If this package is used in a product, Eric Young should be given attribution

  * as the author of the parts of the library used.

  * This can be in the form of a textual message at program startup or

  * in documentation (online or textual) provided with the package.

  * 

  * Redistribution and use in source and binary forms, with or without

  * modification, are permitted provided that the following conditions

  * are met:

  * 1. Redistributions of source code must retain the copyright

  *    notice, this list of conditions and the following disclaimer.

  * 2. Redistributions in binary form must reproduce the above copyright

  *    notice, this list of conditions and the following disclaimer in the

  *    documentation and/or other materials provided with the distribution.

  * 3. All advertising materials mentioning features or use of this software

  *    must display the following acknowledgement:

  *    "This product includes cryptographic software written by

  *     Eric Young (eay@cryptsoft.com)"

  *    The word 'cryptographic' can be left out if the rouines from the library

  *    being used are not cryptographic related :-).

  * 4. If you include any Windows specific code (or a derivative thereof) from 

  *    the apps directory (application code) you must include an acknowledgement:

  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"

  * 

  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND

  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

  * SUCH DAMAGE.

  * 

  * The licence and distribution terms for any publically available version or

  * derivative of this code cannot be changed.  i.e. this code cannot simply be

  * copied and put under another distribution licence

  * [including the GNU Public Licence.]

  */

 #include <stdio.h>

 #include <time.h>

 #include "cryptlib.h"

 #ifndef NO_SYS_TYPES_H

 # include <sys/types.h>

 #endif

 #include <openssl/bn.h>

 #include <openssl/x509.h>

 #include <openssl/objects.h>

 #include <openssl/buffer.h>

 #include <openssl/evp.h>

 #ifndef NO_ASN1_OLD

 EXPORT_C int ASN1_verify(i2d_of_void *i2d, X509_ALGOR *a, ASN1_BIT_STRING *signature,

 		char *data, EVP_PKEY *pkey)

 	{

 	EVP_MD_CTX ctx;

 	const EVP_MD *type;

 	unsigned char *p,*buf_in=NULL;

 	int ret= -1,i,inl;

 	EVP_MD_CTX_init(&ctx);

 	i=OBJ_obj2nid(a->algorithm);

 	type=EVP_get_digestbyname(OBJ_nid2sn(i));

 	if (type == NULL)

 		{

 		ASN1err(ASN1_F_ASN1_VERIFY,ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);

 		goto err;

 		}

 	inl=i2d(data,NULL);

 	buf_in=OPENSSL_malloc((unsigned int)inl);

 	if (buf_in == NULL)

 		{

 		ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_MALLOC_FAILURE);

 		goto err;

 		}

 	p=buf_in;

 	i2d(data,&p);

 	EVP_VerifyInit_ex(&ctx,type, NULL);

 	EVP_VerifyUpdate(&ctx,(unsigned char *)buf_in,inl);

 	OPENSSL_cleanse(buf_in,(unsigned int)inl);

 	OPENSSL_free(buf_in);

 	if (EVP_VerifyFinal(&ctx,(unsigned char *)signature->data,

 			(unsigned int)signature->length,pkey) <= 0)

 		{

 		ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_EVP_LIB);

 		ret=0;

 		goto err;

 		}

 	/* we don't need to zero the 'ctx' because we just checked

 	 * public information */

 	/* memset(&ctx,0,sizeof(ctx)); */

 	ret=1;

 err:

 	EVP_MD_CTX_cleanup(&ctx);

 	return(ret);

 	}

 #endif

 EXPORT_C int ASN1_item_verify(const ASN1_ITEM *it, X509_ALGOR *a, ASN1_BIT_STRING *signature,

 	     void *asn, EVP_PKEY *pkey)

 	{

 	EVP_MD_CTX ctx;

 	const EVP_MD *type;

 	unsigned char *buf_in=NULL;

 	int ret= -1,i,inl;

 	EVP_MD_CTX_init(&ctx);

 	i=OBJ_obj2nid(a->algorithm);

 	type=EVP_get_digestbyname(OBJ_nid2sn(i));

 	if (type == NULL)

 		{

 		ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);

 		goto err;

 		}

 	if (!EVP_VerifyInit_ex(&ctx,type, NULL))

 		{

 		ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB);

 		ret=0;

 		goto err;

 		}

 	inl = ASN1_item_i2d(asn, &buf_in, it);

 	if (buf_in == NULL)

 		{

 		ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_MALLOC_FAILURE);

 		goto err;

 		}

 	EVP_VerifyUpdate(&ctx,(unsigned char *)buf_in,inl);

 	OPENSSL_cleanse(buf_in,(unsigned int)inl);

 	OPENSSL_free(buf_in);

 	if (EVP_VerifyFinal(&ctx,(unsigned char *)signature->data,

 			(unsigned int)signature->length,pkey) <= 0)

 		{

 		ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB);

 		ret=0;

 		goto err;

 		}

 	/* we don't need to zero the 'ctx' because we just checked

 	 * public information */

 	/* memset(&ctx,0,sizeof(ctx)); */

 	ret=1;

 err:

 	EVP_MD_CTX_cleanup(&ctx);

 	return(ret);

 	}