ref: c23504631008ce0bfaa5bec48acb2b04f4b49fd9
dir: /sys/src/ape/lib/openssl/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(const unsigned char *in, unsigned char *out, long length,
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;
}