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bf_enc.c
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bf_enc.c
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/* crypto/bf/bf_enc.c */
/* Copyright (C) 1995-1998 Eric Young ([email protected])
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young ([email protected]).
* 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 ([email protected]).
*
* 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 ([email protected])"
* 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 ([email protected])"
*
* 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 "blowfish.h"
#include "bf_locl.h"
/* Blowfish as implemented from 'Blowfish: Springer-Verlag paper'
* (From LECTURE NOTES IN COMPUTER SCIENCE 809, FAST SOFTWARE ENCRYPTION,
* CAMBRIDGE SECURITY WORKSHOP, CAMBRIDGE, U.K., DECEMBER 9-11, 1993)
*/
#if (BF_ROUNDS != 16) && (BF_ROUNDS != 20)
#error If you set BF_ROUNDS to some value other than 16 or 20, you will have \
to modify the code.
#endif
void BF_encrypt(BF_LONG *data, const BF_KEY *key)
{
#ifndef BF_PTR2
register BF_LONG l,r;
const register BF_LONG *p,*s;
p=key->P;
s= &(key->S[0]);
l=data[0];
r=data[1];
l^=p[0];
BF_ENC(r,l,s,p[ 1]);
BF_ENC(l,r,s,p[ 2]);
BF_ENC(r,l,s,p[ 3]);
BF_ENC(l,r,s,p[ 4]);
BF_ENC(r,l,s,p[ 5]);
BF_ENC(l,r,s,p[ 6]);
BF_ENC(r,l,s,p[ 7]);
BF_ENC(l,r,s,p[ 8]);
BF_ENC(r,l,s,p[ 9]);
BF_ENC(l,r,s,p[10]);
BF_ENC(r,l,s,p[11]);
BF_ENC(l,r,s,p[12]);
BF_ENC(r,l,s,p[13]);
BF_ENC(l,r,s,p[14]);
BF_ENC(r,l,s,p[15]);
BF_ENC(l,r,s,p[16]);
#if BF_ROUNDS == 20
BF_ENC(r,l,s,p[17]);
BF_ENC(l,r,s,p[18]);
BF_ENC(r,l,s,p[19]);
BF_ENC(l,r,s,p[20]);
#endif
r^=p[BF_ROUNDS+1];
data[1]=l&0xffffffffL;
data[0]=r&0xffffffffL;
#else
register BF_LONG l,r,t,*k;
l=data[0];
r=data[1];
k=(BF_LONG*)key;
l^=k[0];
BF_ENC(r,l,k, 1);
BF_ENC(l,r,k, 2);
BF_ENC(r,l,k, 3);
BF_ENC(l,r,k, 4);
BF_ENC(r,l,k, 5);
BF_ENC(l,r,k, 6);
BF_ENC(r,l,k, 7);
BF_ENC(l,r,k, 8);
BF_ENC(r,l,k, 9);
BF_ENC(l,r,k,10);
BF_ENC(r,l,k,11);
BF_ENC(l,r,k,12);
BF_ENC(r,l,k,13);
BF_ENC(l,r,k,14);
BF_ENC(r,l,k,15);
BF_ENC(l,r,k,16);
#if BF_ROUNDS == 20
BF_ENC(r,l,k,17);
BF_ENC(l,r,k,18);
BF_ENC(r,l,k,19);
BF_ENC(l,r,k,20);
#endif
r^=k[BF_ROUNDS+1];
data[1]=l&0xffffffffL;
data[0]=r&0xffffffffL;
#endif
}
#ifndef BF_DEFAULT_OPTIONS
void BF_decrypt(BF_LONG *data, const BF_KEY *key)
{
#ifndef BF_PTR2
register BF_LONG l,r;
const register BF_LONG *p,*s;
p=key->P;
s= &(key->S[0]);
l=data[0];
r=data[1];
l^=p[BF_ROUNDS+1];
#if BF_ROUNDS == 20
BF_ENC(r,l,s,p[20]);
BF_ENC(l,r,s,p[19]);
BF_ENC(r,l,s,p[18]);
BF_ENC(l,r,s,p[17]);
#endif
BF_ENC(r,l,s,p[16]);
BF_ENC(l,r,s,p[15]);
BF_ENC(r,l,s,p[14]);
BF_ENC(l,r,s,p[13]);
BF_ENC(r,l,s,p[12]);
BF_ENC(l,r,s,p[11]);
BF_ENC(r,l,s,p[10]);
BF_ENC(l,r,s,p[ 9]);
BF_ENC(r,l,s,p[ 8]);
BF_ENC(l,r,s,p[ 7]);
BF_ENC(r,l,s,p[ 6]);
BF_ENC(l,r,s,p[ 5]);
BF_ENC(r,l,s,p[ 4]);
BF_ENC(l,r,s,p[ 3]);
BF_ENC(r,l,s,p[ 2]);
BF_ENC(l,r,s,p[ 1]);
r^=p[0];
data[1]=l&0xffffffffL;
data[0]=r&0xffffffffL;
#else
register BF_LONG l,r,t,*k;
l=data[0];
r=data[1];
k=(BF_LONG *)key;
l^=k[BF_ROUNDS+1];
#if BF_ROUNDS == 20
BF_ENC(r,l,k,20);
BF_ENC(l,r,k,19);
BF_ENC(r,l,k,18);
BF_ENC(l,r,k,17);
#endif
BF_ENC(r,l,k,16);
BF_ENC(l,r,k,15);
BF_ENC(r,l,k,14);
BF_ENC(l,r,k,13);
BF_ENC(r,l,k,12);
BF_ENC(l,r,k,11);
BF_ENC(r,l,k,10);
BF_ENC(l,r,k, 9);
BF_ENC(r,l,k, 8);
BF_ENC(l,r,k, 7);
BF_ENC(r,l,k, 6);
BF_ENC(l,r,k, 5);
BF_ENC(r,l,k, 4);
BF_ENC(l,r,k, 3);
BF_ENC(r,l,k, 2);
BF_ENC(l,r,k, 1);
r^=k[0];
data[1]=l&0xffffffffL;
data[0]=r&0xffffffffL;
#endif
}
void BF_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
const BF_KEY *schedule, unsigned char *ivec, int encrypt)
{
register BF_LONG tin0,tin1;
register BF_LONG tout0,tout1,xor0,xor1;
register long l=length;
BF_LONG tin[2];
if (encrypt)
{
n2l(ivec,tout0);
n2l(ivec,tout1);
ivec-=8;
for (l-=8; l>=0; l-=8)
{
n2l(in,tin0);
n2l(in,tin1);
tin0^=tout0;
tin1^=tout1;
tin[0]=tin0;
tin[1]=tin1;
BF_encrypt(tin,schedule);
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;
BF_encrypt(tin,schedule);
tout0=tin[0];
tout1=tin[1];
l2n(tout0,out);
l2n(tout1,out);
}
l2n(tout0,ivec);
l2n(tout1,ivec);
}
else
{
n2l(ivec,xor0);
n2l(ivec,xor1);
ivec-=8;
for (l-=8; l>=0; l-=8)
{
n2l(in,tin0);
n2l(in,tin1);
tin[0]=tin0;
tin[1]=tin1;
BF_decrypt(tin,schedule);
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;
BF_decrypt(tin,schedule);
tout0=tin[0]^xor0;
tout1=tin[1]^xor1;
l2nn(tout0,tout1,out,l+8);
xor0=tin0;
xor1=tin1;
}
l2n(xor0,ivec);
l2n(xor1,ivec);
}
tin0=tin1=tout0=tout1=xor0=xor1=0;
tin[0]=tin[1]=0;
}
#endif