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/*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is the Netscape security libraries.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1994-2000 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU General Public License Version 2 or later (the
* "GPL"), in which case the provisions of the GPL are applicable
* instead of those above. If you wish to allow use of your
* version of this file only under the terms of the GPL and not to
* allow others to use your version of this file under the MPL,
* indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by
* the GPL. If you do not delete the provisions above, a recipient
* may use your version of this file under either the MPL or the
* GPL.
*/
#include "blapit.h"
#include "secport.h"
#include "secerr.h"
/*
* Prepare a buffer for DES encryption, growing to the appropriate boundary,
* filling with the appropriate padding.
*
* NOTE: If arena is non-NULL, we re-allocate from there, otherwise
* we assume (and use) XP memory (re)allocation.
*/
unsigned char *
DES_PadBuffer(PRArenaPool *arena, unsigned char *inbuf, unsigned int inlen,
unsigned int *outlen)
{
unsigned char *outbuf;
unsigned int des_len;
unsigned int i;
unsigned char des_pad_len;
/*
* We need from 1 to DES_KEY_LENGTH bytes -- we *always* grow.
* The extra bytes contain the value of the length of the padding:
* if we have 2 bytes of padding, then the padding is "0x02, 0x02".
*/
des_len = (inlen + DES_KEY_LENGTH) & ~(DES_KEY_LENGTH - 1);
if (arena != NULL) {
outbuf = (unsigned char*)PORT_ArenaGrow (arena, inbuf, inlen, des_len);
} else {
outbuf = (unsigned char*)PORT_Realloc (inbuf, des_len);
}
if (outbuf == NULL) {
PORT_SetError (SEC_ERROR_NO_MEMORY);
return NULL;
}
des_pad_len = des_len - inlen;
for (i = inlen; i < des_len; i++)
outbuf[i] = des_pad_len;
*outlen = des_len;
return outbuf;
}
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