crypto/cast/c_enc.c - third_party/openssl - Git at Google

 /* 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, const CAST_KEY *key)
 {
     register CAST_LONG l, r, t;
     const register CAST_LONG *k;

     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, const CAST_KEY *key)
 {
     register CAST_LONG l, r, t;
     const register CAST_LONG *k;

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

     if (enc) {
         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;
 }
	/* 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, const CAST_KEY key)
	{
	register CAST_LONG l, r, t;
	const register CAST_LONG *k;

	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, const CAST_KEY key)
	{
	register CAST_LONG l, r, t;
	const register CAST_LONG *k;

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

	if (enc) {
	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;
	}