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Diffstat (limited to 'security/nss/lib/softoken/padbuf.c')
-rw-r--r-- | security/nss/lib/softoken/padbuf.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/security/nss/lib/softoken/padbuf.c b/security/nss/lib/softoken/padbuf.c new file mode 100644 index 000000000..8c43fa287 --- /dev/null +++ b/security/nss/lib/softoken/padbuf.c @@ -0,0 +1,81 @@ +/* ***** BEGIN LICENSE BLOCK ***** + * Version: MPL 1.1/GPL 2.0/LGPL 2.1 + * + * The contents of this file are subject to the Mozilla Public License Version + * 1.1 (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * http://www.mozilla.org/MPL/ + * + * Software distributed under the License is distributed on an "AS IS" basis, + * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License + * for the specific language governing rights and limitations under the + * License. + * + * The Original Code is the Netscape security libraries. + * + * The Initial Developer of the Original Code is + * Netscape Communications Corporation. + * Portions created by the Initial Developer are Copyright (C) 1994-2000 + * the Initial Developer. All Rights Reserved. + * + * Contributor(s): + * + * Alternatively, the contents of this file may be used under the terms of + * either the GNU General Public License Version 2 or later (the "GPL"), or + * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), + * in which case the provisions of the GPL or the LGPL are applicable instead + * of those above. If you wish to allow use of your version of this file only + * under the terms of either the GPL or the LGPL, and not to allow others to + * use your version of this file under the terms of the MPL, indicate your + * decision by deleting the provisions above and replace them with the notice + * and other provisions required by the GPL or the LGPL. If you do not delete + * the provisions above, a recipient may use your version of this file under + * the terms of any one of the MPL, the GPL or the LGPL. + * + * ***** END LICENSE BLOCK ***** */ +#include "blapit.h" +#include "secport.h" +#include "secerr.h" + +/* + * Prepare a buffer for any padded CBC encryption algorithm, growing to the + * appropriate boundary and filling with the appropriate padding. + * blockSize must be a power of 2. + * + * NOTE: If arena is non-NULL, we re-allocate from there, otherwise + * we assume (and use) XP memory (re)allocation. + */ +unsigned char * +CBC_PadBuffer(PRArenaPool *arena, unsigned char *inbuf, unsigned int inlen, + unsigned int *outlen, int blockSize) +{ + unsigned char *outbuf; + unsigned int des_len; + unsigned int i; + unsigned char des_pad_len; + + /* + * We need from 1 to blockSize bytes -- we *always* grow. + * The extra bytes contain the value of the length of the padding: + * if we have 2 bytes of padding, then the padding is "0x02, 0x02". + */ + des_len = (inlen + blockSize) & ~(blockSize - 1); + + if (arena != NULL) { + outbuf = (unsigned char*)PORT_ArenaGrow (arena, inbuf, inlen, des_len); + } else { + outbuf = (unsigned char*)PORT_Realloc (inbuf, des_len); + } + + if (outbuf == NULL) { + PORT_SetError (SEC_ERROR_NO_MEMORY); + return NULL; + } + + des_pad_len = des_len - inlen; + for (i = inlen; i < des_len; i++) + outbuf[i] = des_pad_len; + + *outlen = des_len; + return outbuf; +} |