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lightning-sunbird  0.9+nobinonly
padbuf.c
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00001 /* ***** BEGIN LICENSE BLOCK *****
00002  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00003  *
00004  * The contents of this file are subject to the Mozilla Public License Version
00005  * 1.1 (the "License"); you may not use this file except in compliance with
00006  * the License. You may obtain a copy of the License at
00007  * http://www.mozilla.org/MPL/
00008  *
00009  * Software distributed under the License is distributed on an "AS IS" basis,
00010  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00011  * for the specific language governing rights and limitations under the
00012  * License.
00013  *
00014  * The Original Code is the Netscape security libraries.
00015  *
00016  * The Initial Developer of the Original Code is
00017  * Netscape Communications Corporation.
00018  * Portions created by the Initial Developer are Copyright (C) 1994-2000
00019  * the Initial Developer. All Rights Reserved.
00020  *
00021  * Contributor(s):
00022  *
00023  * Alternatively, the contents of this file may be used under the terms of
00024  * either the GNU General Public License Version 2 or later (the "GPL"), or
00025  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00026  * in which case the provisions of the GPL or the LGPL are applicable instead
00027  * of those above. If you wish to allow use of your version of this file only
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00034  *
00035  * ***** END LICENSE BLOCK ***** */
00036 #include "blapit.h"
00037 #include "secport.h"
00038 #include "secerr.h"
00039 
00040 /*
00041  * Prepare a buffer for DES encryption, growing to the appropriate boundary,
00042  * filling with the appropriate padding.
00043  *
00044  * NOTE: If arena is non-NULL, we re-allocate from there, otherwise
00045  * we assume (and use) XP memory (re)allocation.
00046  */
00047 unsigned char *
00048 DES_PadBuffer(PRArenaPool *arena, unsigned char *inbuf, unsigned int inlen,
00049              unsigned int *outlen)
00050 {
00051     unsigned char *outbuf;
00052     unsigned int   des_len;
00053     unsigned int   i;
00054     unsigned char  des_pad_len;
00055 
00056     /*
00057      * We need from 1 to DES_KEY_LENGTH bytes -- we *always* grow.
00058      * The extra bytes contain the value of the length of the padding:
00059      * if we have 2 bytes of padding, then the padding is "0x02, 0x02".
00060      */
00061     des_len = (inlen + DES_KEY_LENGTH) & ~(DES_KEY_LENGTH - 1);
00062 
00063     if (arena != NULL) {
00064        outbuf = (unsigned char*)PORT_ArenaGrow (arena, inbuf, inlen, des_len);
00065     } else {
00066        outbuf = (unsigned char*)PORT_Realloc (inbuf, des_len);
00067     }
00068 
00069     if (outbuf == NULL) {
00070        PORT_SetError (SEC_ERROR_NO_MEMORY);
00071        return NULL;
00072     }
00073 
00074     des_pad_len = des_len - inlen;
00075     for (i = inlen; i < des_len; i++)
00076        outbuf[i] = des_pad_len;
00077 
00078     *outlen = des_len;
00079     return outbuf;
00080 }