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crypt
icbc.c
Go to the documentation of this file.
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/* crypto/idea/i_cbc.c */
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/* Copyright (C) 1995-1998 Eric Young (
[email protected]
)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (
[email protected]
).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* 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 (
[email protected]
).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (
[email protected]
)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (
[email protected]
)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#if defined( INC_ALL )
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#include "
osconfig.h
"
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#include "
idea.h
"
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#include "
idealocl.h
"
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#else
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#include "
crypt/osconfig.h
"
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#include "
crypt/idea.h
"
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#include "
crypt/idealocl.h
"
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#endif
/* Compiler-specific includes */
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void
idea_cbc_encrypt
(
const
unsigned
char
*in,
unsigned
char
*out,
long
length
,
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IDEA_KEY_SCHEDULE
*ks,
unsigned
char
*iv,
int
encrypt)
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{
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register
unsigned
long
tin0,tin1;
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register
unsigned
long
tout0,tout1,xor0,xor1;
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register
long
l=
length
;
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unsigned
long
tin[2];
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if
(encrypt)
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{
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n2l
(iv,tout0);
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n2l
(iv,tout1);
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iv-=8;
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for
(l-=8; l>=0; l-=8)
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{
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n2l
(in,tin0);
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n2l
(in,tin1);
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tin0^=tout0;
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tin1^=tout1;
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tin[0]=tin0;
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tin[1]=tin1;
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idea_encrypt
(tin,ks);
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tout0=tin[0];
l2n
(tout0,out);
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tout1=tin[1];
l2n
(tout1,out);
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}
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if
(l != -8)
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{
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n2ln
(in,tin0,tin1,l+8);
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tin0^=tout0;
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tin1^=tout1;
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tin[0]=tin0;
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tin[1]=tin1;
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idea_encrypt
(tin,ks);
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tout0=tin[0];
l2n
(tout0,out);
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tout1=tin[1];
l2n
(tout1,out);
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}
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l2n
(tout0,iv);
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l2n
(tout1,iv);
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}
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else
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{
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n2l
(iv,xor0);
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n2l
(iv,xor1);
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iv-=8;
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for
(l-=8; l>=0; l-=8)
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{
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n2l
(in,tin0); tin[0]=tin0;
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n2l
(in,tin1); tin[1]=tin1;
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idea_encrypt
(tin,ks);
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tout0=tin[0]^xor0;
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tout1=tin[1]^xor1;
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l2n
(tout0,out);
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l2n
(tout1,out);
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xor0=tin0;
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xor1=tin1;
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}
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if
(l != -8)
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{
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n2l
(in,tin0); tin[0]=tin0;
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n2l
(in,tin1); tin[1]=tin1;
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idea_encrypt
(tin,ks);
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tout0=tin[0]^xor0;
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tout1=tin[1]^xor1;
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l2nn
(tout0,tout1,out,l+8);
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xor0=tin0;
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xor1=tin1;
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}
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l2n
(xor0,iv);
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l2n
(xor1,iv);
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}
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tin0=tin1=tout0=tout1=xor0=xor1=0;
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tin[0]=tin[1]=0;
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}
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void
idea_encrypt
(
unsigned
long
*d,
IDEA_KEY_SCHEDULE
*
key
)
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{
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register
IDEA_INT
*
p
;
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register
unsigned
long
x1,x2,x3,x4,t0,t1,ul;
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x2=d[0];
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x1=(x2>>16);
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x4=d[1];
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x3=(x4>>16);
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p= &(key->
data
[0][0]);
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E_IDEA
(0);
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E_IDEA
(1);
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E_IDEA
(2);
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E_IDEA
(3);
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E_IDEA
(4);
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E_IDEA
(5);
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E_IDEA
(6);
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E_IDEA
(7);
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x1&=0xffff;
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idea_mul
(x1,x1,*p,ul); p++;
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t0= x3+ *(p++);
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t1= x2+ *(p++);
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x4&=0xffff;
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idea_mul
(x4,x4,*p,ul);
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d[0]=(t0&0xffff)|((x1&0xffff)<<16);
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d[1]=(x4&0xffff)|((t1&0xffff)<<16);
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}
Generated on Thu Jan 10 2013 10:00:45 for cryptlib by
1.8.2