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78 lines
2.6 KiB
C
78 lines
2.6 KiB
C
/*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the 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 Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1994-2000 Netscape Communications Corporation. All
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* 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
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* terms of the GNU General Public License Version 2 or later (the
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* "GPL"), in which case the provisions of the GPL are applicable
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* instead of those above. If you wish to allow use of your
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* version of this file only under the terms of the GPL and not to
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* allow others to use your version of this file under the MPL,
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* indicate your decision by deleting the provisions above and
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* replace them with the notice and other provisions required by
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* the GPL. If you do not delete the provisions above, a recipient
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* may use your version of this file under either the MPL or the
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* GPL.
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*/
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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 DES encryption, growing to the appropriate boundary,
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* filling with the appropriate padding.
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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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DES_PadBuffer(PRArenaPool *arena, unsigned char *inbuf, unsigned int inlen,
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unsigned int *outlen)
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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 DES_KEY_LENGTH 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 + DES_KEY_LENGTH) & ~(DES_KEY_LENGTH - 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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