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/** \ingroup BC_m
* \file blockpad.c
*
* Blockcipher padding, code.
*/
/*
* Copyright (c) 2000, 2001 Virtual Unlimited B.V.
*
* Author: Bob Deblier <bob@virtualunlimited.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "system.h"
#include "blockpad.h"
#include "debug.h"
/*@-boundswrite@*/
memchunk* pkcs5Pad(int blockbytes, memchunk* tmp)
{
if (tmp)
{
byte padvalue = blockbytes - (tmp->size % blockbytes);
tmp = memchunkResize(tmp, tmp->size + padvalue);
if (tmp)
memset(tmp->data - padvalue, padvalue, padvalue);
}
return tmp;
}
/*@=boundswrite@*/
/*@-boundsread@*/
memchunk* pkcs5Unpad(int blockbytes, memchunk* tmp)
{
if (tmp)
{
byte padvalue;
int i;
if (tmp->data == (byte*) 0)
return (memchunk*) 0;
padvalue = tmp->data[tmp->size - 1];
if (padvalue > blockbytes)
return (memchunk*) 0;
for (i = (tmp->size - padvalue); i < (tmp->size - 1); i++)
{
if (tmp->data[i] != padvalue)
return (memchunk*) 0;
}
tmp->size -= padvalue;
/* tmp->data = (byte*) realloc(tmp->data, tmp->size; */
}
/*@-temptrans -compdef @*/
return tmp;
/*@=temptrans =compdef @*/
}
/*@=boundsread@*/
/*@-boundswrite@*/
memchunk* pkcs5PadCopy(int blockbytes, const memchunk* src)
{
memchunk* tmp;
byte padvalue = blockbytes - (src->size % blockbytes);
if (src == (memchunk*) 0)
return (memchunk*) 0;
tmp = memchunkAlloc(src->size + padvalue);
if (tmp)
{
memcpy(tmp->data, src->data, src->size);
memset(tmp->data+src->size, padvalue, padvalue);
}
return tmp;
}
/*@=boundswrite@*/
/*@-boundswrite@*/
memchunk* pkcs5UnpadCopy(/*@unused@*/ int blockbytes, const memchunk* src)
{
memchunk* tmp;
byte padvalue;
int i;
if (src == (memchunk*) 0)
return (memchunk*) 0;
if (src->data == (byte*) 0)
return (memchunk*) 0;
padvalue = src->data[src->size - 1];
for (i = (src->size - padvalue); i < (src->size - 1); i++)
{
if (src->data[i] != padvalue)
return (memchunk*) 0;
}
tmp = memchunkAlloc(src->size - padvalue);
if (tmp)
memcpy(tmp->data, src->data, tmp->size);
return tmp;
}
/*@=boundswrite@*/
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