The Tor Browser: security/nss/lib/softoken/padbuf.c@7e26c7da4463

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this

     3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     4 #include "blapit.h"

     5 #include "secport.h"

     6 #include "secerr.h"

     8 /*

     9  * Prepare a buffer for any padded CBC encryption algorithm, growing to the

    10  * appropriate boundary and filling with the appropriate padding.

    11  * blockSize must be a power of 2.

    12  *

    13  * NOTE: If arena is non-NULL, we re-allocate from there, otherwise

    14  * we assume (and use) XP memory (re)allocation.

    15  */

    16 unsigned char *

    17 CBC_PadBuffer(PLArenaPool *arena, unsigned char *inbuf, unsigned int inlen,

    18 	      unsigned int *outlen, int blockSize)

    19 {

    20     unsigned char *outbuf;

    21     unsigned int   des_len;

    22     unsigned int   i;

    23     unsigned char  des_pad_len;

    25     /*

    26      * We need from 1 to blockSize bytes -- we *always* grow.

    27      * The extra bytes contain the value of the length of the padding:

    28      * if we have 2 bytes of padding, then the padding is "0x02, 0x02".

    29      */

    30     des_len = (inlen + blockSize) & ~(blockSize - 1);

    32     if (arena != NULL) {

    33 	outbuf = (unsigned char*)PORT_ArenaGrow (arena, inbuf, inlen, des_len);

    34     } else {

    35 	outbuf = (unsigned char*)PORT_Realloc (inbuf, des_len);

    36     }

    38     if (outbuf == NULL) {

    39 	PORT_SetError (SEC_ERROR_NO_MEMORY);

    40 	return NULL;

    41     }

    43     des_pad_len = des_len - inlen;

    44     for (i = inlen; i < des_len; i++)

    45 	outbuf[i] = des_pad_len;

    47     *outlen = des_len;

    48     return outbuf;

    49 }

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