/* crypto/hmac/hmac.h */

/* 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.]

 */

#ifndef HEADER_HMAC_H

#define HEADER_HMAC_H

#ifdef OPENSSL_NO_HMAC

#error HMAC is disabled.

#endif

#include <openssl/evp.h>

#define HMAC_MAX_MD_CBLOCK	64

#ifdef  __cplusplus

extern "C" {

#endif

typedef struct hmac_ctx_st

	{

	const EVP_MD *md;

	EVP_MD_CTX md_ctx;

	EVP_MD_CTX i_ctx;

	EVP_MD_CTX o_ctx;

	unsigned int key_length;

	unsigned char key[HMAC_MAX_MD_CBLOCK];

	} HMAC_CTX;

#define HMAC_size(e)	(EVP_MD_size((e)->md))

void HMAC_CTX_init(HMAC_CTX *ctx);

void HMAC_CTX_cleanup(HMAC_CTX *ctx);

#define HMAC_cleanup(ctx) HMAC_CTX_cleanup(ctx) /* deprecated */

void HMAC_Init(HMAC_CTX *ctx, const void *key, int len,

	       const EVP_MD *md); /* deprecated */

void HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int len,

		  const EVP_MD *md, ENGINE *impl);

void HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, int len);

void HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len);

unsigned char *HMAC(const EVP_MD *evp_md, const void *key, int key_len,

		    const unsigned char *d, int n, unsigned char *md,

		    unsigned int *md_len);

#ifdef  __cplusplus

}

#endif

#endif