2018-05-04 16:08:28 +02:00
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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2015-10-21 05:03:22 +02:00
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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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2018-05-04 16:08:28 +02:00
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CBC_PadBuffer(PLArenaPool *arena, unsigned char *inbuf, unsigned int inlen,
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2015-10-21 05:03:22 +02:00
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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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