/* crypto/rc5/rc5.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_RC5_H

#define HEADER_RC5_H

#ifdef  __cplusplus

extern "C" {

#endif

#ifdef OPENSSL_NO_RC5

#error RC5 is disabled.

#endif

#define RC5_ENCRYPT	1

#define RC5_DECRYPT	0

/* 32 bit.  For Alpha, things may get weird */

#define RC5_32_INT unsigned long

#define RC5_32_BLOCK		8

#define RC5_32_KEY_LENGTH	16 /* This is a default, max is 255 */

/* This are the only values supported.  Tweak the code if you want more

 * The most supported modes will be

 * RC5-32/12/16

 * RC5-32/16/8

 */

#define RC5_8_ROUNDS	8

#define RC5_12_ROUNDS	12

#define RC5_16_ROUNDS	16

typedef struct rc5_key_st

	{

	/* Number of rounds */

	int rounds;

	RC5_32_INT data[2*(RC5_16_ROUNDS+1)];

	} RC5_32_KEY;

void RC5_32_set_key(RC5_32_KEY *key, int len, const unsigned char *data,

	int rounds);

void RC5_32_ecb_encrypt(const unsigned char *in,unsigned char *out,RC5_32_KEY *key,

	int enc);

void RC5_32_encrypt(unsigned long *data,RC5_32_KEY *key);

void RC5_32_decrypt(unsigned long *data,RC5_32_KEY *key);

void RC5_32_cbc_encrypt(const unsigned char *in, unsigned char *out,

			long length, RC5_32_KEY *ks, unsigned char *iv,

			int enc);

void RC5_32_cfb64_encrypt(const unsigned char *in, unsigned char *out,

			  long length, RC5_32_KEY *schedule,

			  unsigned char *ivec, int *num, int enc);

void RC5_32_ofb64_encrypt(const unsigned char *in, unsigned char *out,

			  long length, RC5_32_KEY *schedule,

			  unsigned char *ivec, int *num);

#ifdef  __cplusplus

}

#endif

#endif