Mercurial > projects > dcrypt
view dcrypt/crypto/padding/X923.d @ 0:0e08791a1418
Initial import.
author | Thomas Dixon <reikon@reikon.us> |
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date | Sun, 10 Aug 2008 14:20:17 -0400 |
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children | cd376996cdb3 |
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/** * This file is part of the dcrypt project. * * Copyright: Copyright (C) dcrypt contributors 2008. All rights reserved. * License: MIT * Authors: Thomas Dixon */ module dcrypt.crypto.padding.X923; import dcrypt.crypto.BlockCipherPadding; /** * This class implements the Null/Zero byte padding described in ANSI X.923. * Ex. [... 0x00, 0x00, 0x03] */ class X923 : BlockCipherPadding { char[] name() { return "X923"; } /* Assumes input_ is a multiple of the underlying * block cipher's block size. */ uint padBlock(void[] input_, uint inOff) { ubyte[] input = cast(ubyte[]) input_; ubyte len = (input.length - inOff); input[inOff..input.length-1] = 0; input[input.length-1] = len; return len; } uint padLength(void[] input_) { ubyte[] input = cast(ubyte[]) input_; ubyte len = input[input.length-1]; if (len > input.length || len == 0) throw new InvalidPaddingError(name()~": Incorrect padding."); return len; } }