padbuf.c
上传用户:lyxiangda
上传日期:2007-01-12
资源大小:3042k
文件大小:3k
- /*
- * 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;
- }