/* crypto/evp/e_rc2.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 "cryptlib.h"

#ifndef OPENSSL_NO_RC2

#include <openssl/evp.h>

#include <openssl/objects.h>

#include "evp_locl.h"

#include <openssl/rc2.h>

static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,

			const unsigned char *iv,int enc);

static int rc2_meth_to_magic(EVP_CIPHER_CTX *ctx);

static int rc2_magic_to_meth(int i);

static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);

static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);

static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);

typedef struct

	{

	int key_bits;	/* effective key bits */

	RC2_KEY ks;	/* key schedule */

	} EVP_RC2_KEY;

#define data(ctx)	((EVP_RC2_KEY *)(ctx)->cipher_data)

IMPLEMENT_BLOCK_CIPHER(rc2, ks, RC2, EVP_RC2_KEY, NID_rc2,

			8,

			RC2_KEY_LENGTH, 8, 64,

			EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,

			rc2_init_key, NULL,

			rc2_set_asn1_type_and_iv, rc2_get_asn1_type_and_iv, 

			rc2_ctrl)

#define RC2_40_MAGIC	0xa0

#define RC2_64_MAGIC	0x78

#define RC2_128_MAGIC	0x3a

static const EVP_CIPHER r2_64_cbc_cipher=

	{

	NID_rc2_64_cbc,

	8,8 /* 64 bit */,8,

	EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,

	rc2_init_key,

	rc2_cbc_cipher,

	NULL,

	sizeof(EVP_RC2_KEY),

	rc2_set_asn1_type_and_iv,

	rc2_get_asn1_type_and_iv,

	rc2_ctrl,

	NULL

	};

static const EVP_CIPHER r2_40_cbc_cipher=

	{

	NID_rc2_40_cbc,

	8,5 /* 40 bit */,8,

	EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,

	rc2_init_key,

	rc2_cbc_cipher,

	NULL,

	sizeof(EVP_RC2_KEY),

	rc2_set_asn1_type_and_iv,

	rc2_get_asn1_type_and_iv,

	rc2_ctrl,

	NULL

	};

EXPORT_C const EVP_CIPHER *EVP_rc2_64_cbc(void)

	{

	return(&r2_64_cbc_cipher);

	}

EXPORT_C const EVP_CIPHER *EVP_rc2_40_cbc(void)

	{

	return(&r2_40_cbc_cipher);

	}

static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,

			const unsigned char *iv, int enc)

	{

	RC2_set_key(&data(ctx)->ks,EVP_CIPHER_CTX_key_length(ctx),

		    key,data(ctx)->key_bits);

	return 1;

	}

static int rc2_meth_to_magic(EVP_CIPHER_CTX *e)

	{

	int i;

	EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i);

	if 	(i == 128) return(RC2_128_MAGIC);

	else if (i == 64)  return(RC2_64_MAGIC);

	else if (i == 40)  return(RC2_40_MAGIC);

	else return(0);

	}

static int rc2_magic_to_meth(int i)

	{

	if      (i == RC2_128_MAGIC) return 128;

	else if (i == RC2_64_MAGIC)  return 64;

	else if (i == RC2_40_MAGIC)  return 40;

	else

		{

		EVPerr(EVP_F_RC2_MAGIC_TO_METH,EVP_R_UNSUPPORTED_KEY_SIZE);

		return(0);

		}

	}

static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)

	{

	long num=0;

	int i=0;

	int key_bits;

	unsigned int l;

	unsigned char iv[EVP_MAX_IV_LENGTH];

	if (type != NULL)

		{

		l=EVP_CIPHER_CTX_iv_length(c);

		OPENSSL_assert(l <= sizeof(iv));

		i=ASN1_TYPE_get_int_octetstring(type,&num,iv,l);

		if (i != (int)l)

			return(-1);

		key_bits =rc2_magic_to_meth((int)num);

		if (!key_bits)

			return(-1);

		if(i > 0) EVP_CipherInit_ex(c, NULL, NULL, NULL, iv, -1);

		EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS, key_bits, NULL);

		EVP_CIPHER_CTX_set_key_length(c, key_bits / 8);

		}

	return(i);

	}

static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)

	{

	long num;

	int i=0,j;

	if (type != NULL)

		{

		num=rc2_meth_to_magic(c);

		j=EVP_CIPHER_CTX_iv_length(c);

		i=ASN1_TYPE_set_int_octetstring(type,num,c->oiv,j);

		}

	return(i);

	}

static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)

	{

	switch(type)

		{

	case EVP_CTRL_INIT:

		data(c)->key_bits = EVP_CIPHER_CTX_key_length(c) * 8;

		return 1;

	case EVP_CTRL_GET_RC2_KEY_BITS:

		*(int *)ptr = data(c)->key_bits;

		return 1;

	case EVP_CTRL_SET_RC2_KEY_BITS:

		if(arg > 0)

			{

			data(c)->key_bits = arg;

			return 1;

			}

		return 0;

	default:

		return -1;

		}

	}

#endif