[thirdparty/openssl.git] / crypto / cast / c_enc.c

/* crypto/cast/c_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 <openssl/cast.h>
#include "cast_lcl.h"

void CAST_encrypt(CAST_LONG *data, CAST_KEY *key)
	{
	register CAST_LONG l,r,*k,t;

	k= &(key->data[0]);
	l=data[0];
	r=data[1];

	E_CAST( 0,k,l,r,+,^,-);
	E_CAST( 1,k,r,l,^,-,+);
	E_CAST( 2,k,l,r,-,+,^);
	E_CAST( 3,k,r,l,+,^,-);
	E_CAST( 4,k,l,r,^,-,+);
	E_CAST( 5,k,r,l,-,+,^);
	E_CAST( 6,k,l,r,+,^,-);
	E_CAST( 7,k,r,l,^,-,+);
	E_CAST( 8,k,l,r,-,+,^);
	E_CAST( 9,k,r,l,+,^,-);
	E_CAST(10,k,l,r,^,-,+);
	E_CAST(11,k,r,l,-,+,^);
	if(!key->short_key)
	    {
	    E_CAST(12,k,l,r,+,^,-);
	    E_CAST(13,k,r,l,^,-,+);
	    E_CAST(14,k,l,r,-,+,^);
	    E_CAST(15,k,r,l,+,^,-);
	    }

	data[1]=l&0xffffffffL;
	data[0]=r&0xffffffffL;
	}

void CAST_decrypt(CAST_LONG *data, CAST_KEY *key)
	{
	register CAST_LONG l,r,*k,t;

	k= &(key->data[0]);
	l=data[0];
	r=data[1];

	if(!key->short_key)
	    {
	    E_CAST(15,k,l,r,+,^,-);
	    E_CAST(14,k,r,l,-,+,^);
	    E_CAST(13,k,l,r,^,-,+);
	    E_CAST(12,k,r,l,+,^,-);
	    }
	E_CAST(11,k,l,r,-,+,^);
	E_CAST(10,k,r,l,^,-,+);
	E_CAST( 9,k,l,r,+,^,-);
	E_CAST( 8,k,r,l,-,+,^);
	E_CAST( 7,k,l,r,^,-,+);
	E_CAST( 6,k,r,l,+,^,-);
	E_CAST( 5,k,l,r,-,+,^);
	E_CAST( 4,k,r,l,^,-,+);
	E_CAST( 3,k,l,r,+,^,-);
	E_CAST( 2,k,r,l,-,+,^);
	E_CAST( 1,k,l,r,^,-,+);
	E_CAST( 0,k,r,l,+,^,-);

	data[1]=l&0xffffffffL;
	data[0]=r&0xffffffffL;
	}

void CAST_cbc_encrypt(unsigned char *in, unsigned char *out, long length,
	     CAST_KEY *ks, unsigned char *iv, int encrypt)
	{
	register CAST_LONG tin0,tin1;
	register CAST_LONG tout0,tout1,xor0,xor1;
	register long l=length;
	CAST_LONG tin[2];

	if (encrypt)
		{
		n2l(iv,tout0);
		n2l(iv,tout1);
		iv-=8;
		for (l-=8; l>=0; l-=8)
			{
			n2l(in,tin0);
			n2l(in,tin1);
			tin0^=tout0;
			tin1^=tout1;
			tin[0]=tin0;
			tin[1]=tin1;
			CAST_encrypt(tin,ks);
			tout0=tin[0];
			tout1=tin[1];
			l2n(tout0,out);
			l2n(tout1,out);
			}
		if (l != -8)
			{
			n2ln(in,tin0,tin1,l+8);
			tin0^=tout0;
			tin1^=tout1;
			tin[0]=tin0;
			tin[1]=tin1;
			CAST_encrypt(tin,ks);
			tout0=tin[0];
			tout1=tin[1];
			l2n(tout0,out);
			l2n(tout1,out);
			}
		l2n(tout0,iv);
		l2n(tout1,iv);
		}
	else
		{
		n2l(iv,xor0);
		n2l(iv,xor1);
		iv-=8;
		for (l-=8; l>=0; l-=8)
			{
			n2l(in,tin0);
			n2l(in,tin1);
			tin[0]=tin0;
			tin[1]=tin1;
			CAST_decrypt(tin,ks);
			tout0=tin[0]^xor0;
			tout1=tin[1]^xor1;
			l2n(tout0,out);
			l2n(tout1,out);
			xor0=tin0;
			xor1=tin1;
			}
		if (l != -8)
			{
			n2l(in,tin0);
			n2l(in,tin1);
			tin[0]=tin0;
			tin[1]=tin1;
			CAST_decrypt(tin,ks);
			tout0=tin[0]^xor0;
			tout1=tin[1]^xor1;
			l2nn(tout0,tout1,out,l+8);
			xor0=tin0;
			xor1=tin1;
			}
		l2n(xor0,iv);
		l2n(xor1,iv);
		}
	tin0=tin1=tout0=tout1=xor0=xor1=0;
	tin[0]=tin[1]=0;
	}
Commit	Line	Data
58964a49 RE	1	/* crypto/cast/c_enc.c */
	2	/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
	3	* All rights reserved.
	4	*
	5	* This package is an SSL implementation written
	6	* by Eric Young (eay@cryptsoft.com).
	7	* The implementation was written so as to conform with Netscapes SSL.
	8	*
	9	* This library is free for commercial and non-commercial use as long as
	10	* the following conditions are aheared to. The following conditions
	11	* apply to all code found in this distribution, be it the RC4, RSA,
	12	* lhash, DES, etc., code; not just the SSL code. The SSL documentation
	13	* included with this distribution is covered by the same copyright terms
	14	* except that the holder is Tim Hudson (tjh@cryptsoft.com).
	15	*
	16	* Copyright remains Eric Young's, and as such any Copyright notices in
	17	* the code are not to be removed.
	18	* If this package is used in a product, Eric Young should be given attribution
	19	* as the author of the parts of the library used.
	20	* This can be in the form of a textual message at program startup or
	21	* in documentation (online or textual) provided with the package.
	22	*
	23	* Redistribution and use in source and binary forms, with or without
	24	* modification, are permitted provided that the following conditions
	25	* are met:
	26	* 1. Redistributions of source code must retain the copyright
	27	* notice, this list of conditions and the following disclaimer.
	28	* 2. Redistributions in binary form must reproduce the above copyright
	29	* notice, this list of conditions and the following disclaimer in the
	30	* documentation and/or other materials provided with the distribution.
	31	* 3. All advertising materials mentioning features or use of this software
	32	* must display the following acknowledgement:
	33	* "This product includes cryptographic software written by
	34	* Eric Young (eay@cryptsoft.com)"
	35	* The word 'cryptographic' can be left out if the rouines from the library
	36	* being used are not cryptographic related :-).
	37	* 4. If you include any Windows specific code (or a derivative thereof) from
	38	* the apps directory (application code) you must include an acknowledgement:
	39	* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
	40	*
	41	* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
	42	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	43	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	44	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	45	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	46	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	47	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	48	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	49	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	50	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	51	* SUCH DAMAGE.
	52	*
	53	* The licence and distribution terms for any publically available version or
	54	* derivative of this code cannot be changed. i.e. this code cannot simply be
	55	* copied and put under another distribution licence
	56	* [including the GNU Public Licence.]
	57	*/
	58
ec577822	59	#include <openssl/cast.h>
58964a49 RE	60	#include "cast_lcl.h"
58964a49 RE	61
6b691a5c	62	void CAST_encrypt(CAST_LONG data, CAST_KEY key)
58964a49 RE	63	{
	64	register CAST_LONG l,r,*k,t;
	65
	66	k= &(key->data[0]);
	67	l=data[0];
	68	r=data[1];
	69
	70	E_CAST( 0,k,l,r,+,^,-);
	71	E_CAST( 1,k,r,l,^,-,+);
	72	E_CAST( 2,k,l,r,-,+,^);
	73	E_CAST( 3,k,r,l,+,^,-);
	74	E_CAST( 4,k,l,r,^,-,+);
	75	E_CAST( 5,k,r,l,-,+,^);
	76	E_CAST( 6,k,l,r,+,^,-);
	77	E_CAST( 7,k,r,l,^,-,+);
	78	E_CAST( 8,k,l,r,-,+,^);
	79	E_CAST( 9,k,r,l,+,^,-);
	80	E_CAST(10,k,l,r,^,-,+);
	81	E_CAST(11,k,r,l,-,+,^);
b13a1554	82	if(!key->short_key)
649cdb7b BL	83	{
	84	E_CAST(12,k,l,r,+,^,-);
	85	E_CAST(13,k,r,l,^,-,+);
	86	E_CAST(14,k,l,r,-,+,^);
	87	E_CAST(15,k,r,l,+,^,-);
	88	}
58964a49 RE	89
	90	data[1]=l&0xffffffffL;
	91	data[0]=r&0xffffffffL;
	92	}
	93
6b691a5c	94	void CAST_decrypt(CAST_LONG data, CAST_KEY key)
58964a49 RE	95	{
	96	register CAST_LONG l,r,*k,t;
	97
	98	k= &(key->data[0]);
	99	l=data[0];
	100	r=data[1];
	101
b13a1554	102	if(!key->short_key)
649cdb7b BL	103	{
	104	E_CAST(15,k,l,r,+,^,-);
	105	E_CAST(14,k,r,l,-,+,^);
	106	E_CAST(13,k,l,r,^,-,+);
	107	E_CAST(12,k,r,l,+,^,-);
	108	}
58964a49 RE	109	E_CAST(11,k,l,r,-,+,^);
	110	E_CAST(10,k,r,l,^,-,+);
	111	E_CAST( 9,k,l,r,+,^,-);
	112	E_CAST( 8,k,r,l,-,+,^);
	113	E_CAST( 7,k,l,r,^,-,+);
	114	E_CAST( 6,k,r,l,+,^,-);
	115	E_CAST( 5,k,l,r,-,+,^);
	116	E_CAST( 4,k,r,l,^,-,+);
	117	E_CAST( 3,k,l,r,+,^,-);
	118	E_CAST( 2,k,r,l,-,+,^);
	119	E_CAST( 1,k,l,r,^,-,+);
	120	E_CAST( 0,k,r,l,+,^,-);
	121
	122	data[1]=l&0xffffffffL;
	123	data[0]=r&0xffffffffL;
	124	}
	125
6b691a5c UM	126	void CAST_cbc_encrypt(unsigned char in, unsigned char out, long length,
6b691a5c UM	127	CAST_KEY ks, unsigned char iv, int encrypt)
58964a49 RE	128	{
	129	register CAST_LONG tin0,tin1;
	130	register CAST_LONG tout0,tout1,xor0,xor1;
	131	register long l=length;
	132	CAST_LONG tin[2];
	133
	134	if (encrypt)
	135	{
	136	n2l(iv,tout0);
	137	n2l(iv,tout1);
	138	iv-=8;
	139	for (l-=8; l>=0; l-=8)
	140	{
	141	n2l(in,tin0);
	142	n2l(in,tin1);
	143	tin0^=tout0;
	144	tin1^=tout1;
	145	tin[0]=tin0;
	146	tin[1]=tin1;
	147	CAST_encrypt(tin,ks);
	148	tout0=tin[0];
	149	tout1=tin[1];
	150	l2n(tout0,out);
	151	l2n(tout1,out);
	152	}
	153	if (l != -8)
	154	{
	155	n2ln(in,tin0,tin1,l+8);
	156	tin0^=tout0;
	157	tin1^=tout1;
	158	tin[0]=tin0;
	159	tin[1]=tin1;
	160	CAST_encrypt(tin,ks);
	161	tout0=tin[0];
	162	tout1=tin[1];
	163	l2n(tout0,out);
	164	l2n(tout1,out);
	165	}
	166	l2n(tout0,iv);
	167	l2n(tout1,iv);
	168	}
	169	else
	170	{
	171	n2l(iv,xor0);
	172	n2l(iv,xor1);
	173	iv-=8;
	174	for (l-=8; l>=0; l-=8)
	175	{
	176	n2l(in,tin0);
	177	n2l(in,tin1);
	178	tin[0]=tin0;
	179	tin[1]=tin1;
	180	CAST_decrypt(tin,ks);
	181	tout0=tin[0]^xor0;
	182	tout1=tin[1]^xor1;
	183	l2n(tout0,out);
	184	l2n(tout1,out);
	185	xor0=tin0;
	186	xor1=tin1;
	187	}
	188	if (l != -8)
	189	{
	190	n2l(in,tin0);
	191	n2l(in,tin1);
192	tin[0]=tin0;
193	tin[1]=tin1;
194	CAST_decrypt(tin,ks);
195	tout0=tin[0]^xor0;
196	tout1=tin[1]^xor1;
197	l2nn(tout0,tout1,out,l+8);
198	xor0=tin0;
199	xor1=tin1;
200	}
201	l2n(xor0,iv);
202	l2n(xor1,iv);
203	}
204	tin0=tin1=tout0=tout1=xor0=xor1=0;
205	tin[0]=tin[1]=0;
206	}
207