/* crypto/rc5/rc5_enc.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 <openssl/rc5.h>#include "rc5_locl.h"void RC5_32_cbc_encrypt(const unsigned char *in, unsigned char *out,			long length, RC5_32_KEY *ks, unsigned char *iv,			int encrypt)	{	register unsigned long tin0,tin1;	register unsigned long tout0,tout1,xor0,xor1;	register long l=length;	unsigned long tin[2];	if (encrypt)		{		c2l(iv,tout0);		c2l(iv,tout1);		iv-=8;		for (l-=8; l>=0; l-=8)			{			c2l(in,tin0);			c2l(in,tin1);			tin0^=tout0;			tin1^=tout1;			tin[0]=tin0;			tin[1]=tin1;			RC5_32_encrypt(tin,ks);			tout0=tin[0]; l2c(tout0,out);			tout1=tin[1]; l2c(tout1,out);			}		if (l != -8)			{			c2ln(in,tin0,tin1,l+8);			tin0^=tout0;			tin1^=tout1;			tin[0]=tin0;			tin[1]=tin1;			RC5_32_encrypt(tin,ks);			tout0=tin[0]; l2c(tout0,out);			tout1=tin[1]; l2c(tout1,out);			}		l2c(tout0,iv);		l2c(tout1,iv);		}	else		{		c2l(iv,xor0);		c2l(iv,xor1);		iv-=8;		for (l-=8; l>=0; l-=8)			{			c2l(in,tin0); tin[0]=tin0;			c2l(in,tin1); tin[1]=tin1;			RC5_32_decrypt(tin,ks);			tout0=tin[0]^xor0;			tout1=tin[1]^xor1;			l2c(tout0,out);			l2c(tout1,out);			xor0=tin0;			xor1=tin1;			}		if (l != -8)			{			c2l(in,tin0); tin[0]=tin0;			c2l(in,tin1); tin[1]=tin1;			RC5_32_decrypt(tin,ks);			tout0=tin[0]^xor0;			tout1=tin[1]^xor1;			l2cn(tout0,tout1,out,l+8);			xor0=tin0;			xor1=tin1;			}		l2c(xor0,iv);		l2c(xor1,iv);		}	tin0=tin1=tout0=tout1=xor0=xor1=0;	tin[0]=tin[1]=0;	}void RC5_32_encrypt(unsigned long *d, RC5_32_KEY *key)	{	RC5_32_INT a,b,*s;	s=key->data;	a=d[0]+s[0];	b=d[1]+s[1];	E_RC5_32(a,b,s, 2);	E_RC5_32(a,b,s, 4);	E_RC5_32(a,b,s, 6);	E_RC5_32(a,b,s, 8);	E_RC5_32(a,b,s,10);	E_RC5_32(a,b,s,12);	E_RC5_32(a,b,s,14);	E_RC5_32(a,b,s,16);	if (key->rounds == 12)		{		E_RC5_32(a,b,s,18);		E_RC5_32(a,b,s,20);		E_RC5_32(a,b,s,22);		E_RC5_32(a,b,s,24);		}	else if (key->rounds == 16)		{		/* Do a full expansion to avoid a jump */		E_RC5_32(a,b,s,18);		E_RC5_32(a,b,s,20);		E_RC5_32(a,b,s,22);		E_RC5_32(a,b,s,24);		E_RC5_32(a,b,s,26);		E_RC5_32(a,b,s,28);		E_RC5_32(a,b,s,30);		E_RC5_32(a,b,s,32);		}	d[0]=a;	d[1]=b;	}void RC5_32_decrypt(unsigned long *d, RC5_32_KEY *key)	{	RC5_32_INT a,b,*s;	s=key->data;	a=d[0];	b=d[1];	if (key->rounds == 16) 		{		D_RC5_32(a,b,s,32);		D_RC5_32(a,b,s,30);		D_RC5_32(a,b,s,28);		D_RC5_32(a,b,s,26);		/* Do a full expansion to avoid a jump */		D_RC5_32(a,b,s,24);		D_RC5_32(a,b,s,22);		D_RC5_32(a,b,s,20);		D_RC5_32(a,b,s,18);		}	else if (key->rounds == 12)		{		D_RC5_32(a,b,s,24);		D_RC5_32(a,b,s,22);		D_RC5_32(a,b,s,20);		D_RC5_32(a,b,s,18);		}	D_RC5_32(a,b,s,16);	D_RC5_32(a,b,s,14);	D_RC5_32(a,b,s,12);	D_RC5_32(a,b,s,10);	D_RC5_32(a,b,s, 8);	D_RC5_32(a,b,s, 6);	D_RC5_32(a,b,s, 4);	D_RC5_32(a,b,s, 2);	d[0]=a-s[0];	d[1]=b-s[1];	}