/* 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