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82 lines
2.9 KiB
C
82 lines
2.9 KiB
C
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the Netscape security libraries.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1994-2000
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "blapit.h"
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#include "secport.h"
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#include "secerr.h"
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/*
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* Prepare a buffer for any padded CBC encryption algorithm, growing to the
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* appropriate boundary and filling with the appropriate padding.
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* blockSize must be a power of 2.
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*
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* NOTE: If arena is non-NULL, we re-allocate from there, otherwise
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* we assume (and use) XP memory (re)allocation.
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*/
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unsigned char *
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CBC_PadBuffer(PRArenaPool *arena, unsigned char *inbuf, unsigned int inlen,
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unsigned int *outlen, int blockSize)
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{
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unsigned char *outbuf;
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unsigned int des_len;
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unsigned int i;
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unsigned char des_pad_len;
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/*
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* We need from 1 to blockSize bytes -- we *always* grow.
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* The extra bytes contain the value of the length of the padding:
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* if we have 2 bytes of padding, then the padding is "0x02, 0x02".
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*/
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des_len = (inlen + blockSize) & ~(blockSize - 1);
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if (arena != NULL) {
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outbuf = (unsigned char*)PORT_ArenaGrow (arena, inbuf, inlen, des_len);
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} else {
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outbuf = (unsigned char*)PORT_Realloc (inbuf, des_len);
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}
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if (outbuf == NULL) {
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PORT_SetError (SEC_ERROR_NO_MEMORY);
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return NULL;
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}
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des_pad_len = des_len - inlen;
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for (i = inlen; i < des_len; i++)
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outbuf[i] = des_pad_len;
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*outlen = des_len;
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return outbuf;
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}
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