/* 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	0x3astatic 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	};const EVP_CIPHER *EVP_rc2_64_cbc(void)	{	return(&r2_64_cbc_cipher);	}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