The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/security/nss/lib/softoken/padbuf.c	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,49 @@
     1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
     1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this
     1.6 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
     1.7 +#include "blapit.h"
     1.8 +#include "secport.h"
     1.9 +#include "secerr.h"
    1.10 +
    1.11 +/*
    1.12 + * Prepare a buffer for any padded CBC encryption algorithm, growing to the 
    1.13 + * appropriate boundary and filling with the appropriate padding.
    1.14 + * blockSize must be a power of 2.
    1.15 + *
    1.16 + * NOTE: If arena is non-NULL, we re-allocate from there, otherwise
    1.17 + * we assume (and use) XP memory (re)allocation.
    1.18 + */
    1.19 +unsigned char *
    1.20 +CBC_PadBuffer(PLArenaPool *arena, unsigned char *inbuf, unsigned int inlen,
    1.21 +	      unsigned int *outlen, int blockSize)
    1.22 +{
    1.23 +    unsigned char *outbuf;
    1.24 +    unsigned int   des_len;
    1.25 +    unsigned int   i;
    1.26 +    unsigned char  des_pad_len;
    1.27 +
    1.28 +    /*
    1.29 +     * We need from 1 to blockSize bytes -- we *always* grow.
    1.30 +     * The extra bytes contain the value of the length of the padding:
    1.31 +     * if we have 2 bytes of padding, then the padding is "0x02, 0x02".
    1.32 +     */
    1.33 +    des_len = (inlen + blockSize) & ~(blockSize - 1);
    1.34 +
    1.35 +    if (arena != NULL) {
    1.36 +	outbuf = (unsigned char*)PORT_ArenaGrow (arena, inbuf, inlen, des_len);
    1.37 +    } else {
    1.38 +	outbuf = (unsigned char*)PORT_Realloc (inbuf, des_len);
    1.39 +    }
    1.40 +
    1.41 +    if (outbuf == NULL) {
    1.42 +	PORT_SetError (SEC_ERROR_NO_MEMORY);
    1.43 +	return NULL;
    1.44 +    }
    1.45 +
    1.46 +    des_pad_len = des_len - inlen;
    1.47 +    for (i = inlen; i < des_len; i++)
    1.48 +	outbuf[i] = des_pad_len;
    1.49 +
    1.50 +    *outlen = des_len;
    1.51 +    return outbuf;
    1.52 +}