mirror of
https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
synced 2024-12-23 10:06:25 +01:00
112 lines
3.7 KiB
C
112 lines
3.7 KiB
C
/* crypto/des/ofb_enc.c */
|
|
/* Copyright (C) 1995-1996 Eric Young (eay@mincom.oz.au)
|
|
* All rights reserved.
|
|
*
|
|
* This file is part of an SSL implementation written
|
|
* by Eric Young (eay@mincom.oz.au).
|
|
* The implementation was written so as to conform with Netscapes SSL
|
|
* specification. This library and applications are
|
|
* FREE FOR COMMERCIAL AND NON-COMMERCIAL USE
|
|
* as long as the following conditions are aheared to.
|
|
*
|
|
* Copyright remains Eric Young's, and as such any Copyright notices in
|
|
* the code are not to be removed. If this code is used in a product,
|
|
* Eric Young should be given attribution as the author of the parts 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 software developed by Eric Young (eay@mincom.oz.au)
|
|
*
|
|
* 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 "des_locl.h"
|
|
|
|
/* The input and output are loaded in multiples of 8 bits.
|
|
* What this means is that if you hame numbits=12 and length=2
|
|
* the first 12 bits will be retrieved from the first byte and half
|
|
* the second. The second 12 bits will come from the 3rd and half the 4th
|
|
* byte.
|
|
*/
|
|
void des_ofb_encrypt(in, out, numbits, length, schedule, ivec)
|
|
unsigned char *in;
|
|
unsigned char *out;
|
|
int numbits;
|
|
long length;
|
|
des_key_schedule schedule;
|
|
des_cblock (*ivec);
|
|
{
|
|
register DES_LONG d0,d1,v0,v1,n=(numbits+7)/8;
|
|
register DES_LONG mask0,mask1;
|
|
register long l=length;
|
|
register int num=numbits;
|
|
DES_LONG ti[2];
|
|
unsigned char *iv;
|
|
|
|
if (num > 64) return;
|
|
if (num > 32)
|
|
{
|
|
mask0=0xffffffffL;
|
|
if (num >= 64)
|
|
mask1=mask0;
|
|
else
|
|
mask1=(1L<<(num-32))-1;
|
|
}
|
|
else
|
|
{
|
|
if (num == 32)
|
|
mask0=0xffffffffL;
|
|
else
|
|
mask0=(1L<<num)-1;
|
|
mask1=0x00000000;
|
|
}
|
|
|
|
iv=(unsigned char *)ivec;
|
|
c2l(iv,v0);
|
|
c2l(iv,v1);
|
|
ti[0]=v0;
|
|
ti[1]=v1;
|
|
while (l-- > 0)
|
|
{
|
|
des_encrypt((DES_LONG *)ti,schedule,DES_ENCRYPT);
|
|
c2ln(in,d0,d1,n);
|
|
in+=n;
|
|
d0=(d0^ti[0])&mask0;
|
|
d1=(d1^ti[1])&mask1;
|
|
l2cn(d0,d1,out,n);
|
|
out+=n;
|
|
}
|
|
v0=ti[0];
|
|
v1=ti[1];
|
|
iv=(unsigned char *)ivec;
|
|
l2c(v0,iv);
|
|
l2c(v1,iv);
|
|
v0=v1=d0=d1=ti[0]=ti[1]=0;
|
|
}
|
|
|