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1 /**
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2 * This file is part of the dcrypt project.
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3 *
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4 * Copyright: Copyright (C) dcrypt contributors 2008. All rights reserved.
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5 * License: MIT
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6 * Authors: Thomas Dixon
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7 */
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8
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9 module dcrypt.crypto.BlockCipherPadding;
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10
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11 public import dcrypt.crypto.errors.InvalidPaddingError;
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12
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13 /** Base padding class for implementing block padding schemes. */
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14 abstract class BlockCipherPadding {
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15 /** Returns: The name of the padding scheme implemented. */
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16 char[] name();
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17
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18 /**
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19 * Pad the (last) block of plaintext to block length.
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20 *
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21 * Params:
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22 * input_ = Plaintext block to be padded.
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23 * inOffset = Offset at which to begin padding input_.
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24 *
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25 * Returns: The number of padding bytes added.
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26 */
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27 uint padBlock(void[] input_, uint inOff);
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28
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29 /**
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30 * Return the number of pad bytes in the block.
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31 *
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32 * Params:
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33 * input_ = Padded block of which to count the pad bytes.
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34 *
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35 * Returns: The number of pad bytes in the block.
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36 *
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37 * Throws: dcrypt.crypto.errors.InvalidPaddingError if
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38 * pad length cannot be discerned.
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39 */
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40 uint padLength(void[] input_);
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41 }
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