Mercurial > projects > dcrypt
view dcrypt/crypto/padding/PKCS7.d @ 36:fc97fffd106d default tip
Added tag 0.1 for changeset 6b2c35b84186
author | Thomas Dixon <reikon@reikon.us> |
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date | Thu, 14 May 2009 17:46:46 -0400 |
parents | 6b2c35b84186 |
children |
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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.PKCS7; import dcrypt.crypto.BlockCipherPadding; /** * This class implements the padding scheme described in PKCS7 * from RSA Security. Ex. [... 0x03, 0x03, 0x03] */ class PKCS7 : BlockCipherPadding { string name() { return "PKCS7"; } ubyte[] pad(uint len) { ubyte[] output = new ubyte[len]; output[0..output.length] = cast(ubyte)len; return output; } uint unpad(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."); uint limit = input.length; for (int i = 0; i < len; i++) if (input[--limit] != len) throw new InvalidPaddingError(name()~": Pad value does not match pad length."); return len; } }