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comparison dcrypt/crypto/padding/X923.d @ 0:0e08791a1418

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Initial import.
author Thomas Dixon <reikon@reikon.us>
date Sun, 10 Aug 2008 14:20:17 -0400
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children cd376996cdb3
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-1:000000000000 0:0e08791a1418
1 /**
2 * This file is part of the dcrypt project.
3 *
4 * Copyright: Copyright (C) dcrypt contributors 2008. All rights reserved.
5 * License: MIT
6 * Authors: Thomas Dixon
7 */
8
9 module dcrypt.crypto.padding.X923;
10
11 import dcrypt.crypto.BlockCipherPadding;
12
13 /**
14 * This class implements the Null/Zero byte padding described in ANSI X.923.
15 * Ex. [... 0x00, 0x00, 0x03]
16 */
17 class X923 : BlockCipherPadding {
18 char[] name() {
19 return "X923";
20 }
21
22 /* Assumes input_ is a multiple of the underlying
23 * block cipher's block size.
24 */
25 uint padBlock(void[] input_, uint inOff) {
26 ubyte[] input = cast(ubyte[]) input_;
27
28 ubyte len = (input.length - inOff);
29
30 input[inOff..input.length-1] = 0;
31 input[input.length-1] = len;
32
33 return len;
34 }
35
36 uint padLength(void[] input_) {
37 ubyte[] input = cast(ubyte[]) input_;
38
39 ubyte len = input[input.length-1];
40
41 if (len > input.length || len == 0)
42 throw new InvalidPaddingError(name()~": Incorrect padding.");
43
44 return len;
45 }
46 }