The Tor Browser / file comparison
comparison: security/nss/lib/softoken/padbuf.c
security/nss/lib/softoken/padbuf.c
- changeset 0
- 6474c204b198
equal
deleted
inserted
replaced
| -1:000000000000 | 0:113fa3590eec |
|---|---|
| 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" | |
| 7 | |
| 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; | |
| 24 | |
| 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); | |
| 31 | |
| 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 } | |
| 37 | |
| 38 if (outbuf == NULL) { | |
| 39 PORT_SetError (SEC_ERROR_NO_MEMORY); | |
| 40 return NULL; | |
| 41 } | |
| 42 | |
| 43 des_pad_len = des_len - inlen; | |
| 44 for (i = inlen; i < des_len; i++) | |
| 45 outbuf[i] = des_pad_len; | |
| 46 | |
| 47 *outlen = des_len; | |
| 48 return outbuf; | |
| 49 } |
