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48 lines
1.9 KiB
C#
48 lines
1.9 KiB
C#
using System;
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namespace Renci.SshNet.Security.Cryptography.Ciphers.Paddings
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{
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/// <summary>
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/// Implements PKCS5 cipher padding
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/// </summary>
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public class PKCS5Padding : CipherPadding
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{
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/// <summary>
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/// Pads the specified input to match the block size.
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/// </summary>
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/// <param name="blockSize">The size of the block.</param>
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/// <param name="input">The input.</param>
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/// <param name="offset">The zero-based offset in <paramref name="input"/> at which the data to pad starts.</param>
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/// <param name="length">The number of bytes in <paramref name="input"/> to take into account.</param>
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/// <returns>
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/// The padded data array.
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/// </returns>
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public override byte[] Pad(int blockSize, byte[] input, int offset, int length)
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{
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var numOfPaddedBytes = blockSize - (length % blockSize);
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return Pad(input, offset, length, numOfPaddedBytes);
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}
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/// <summary>
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/// Pads the specified input with a given number of bytes.
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/// </summary>
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/// <param name="input">The input.</param>
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/// <param name="offset">The zero-based offset in <paramref name="input"/> at which the data to pad starts.</param>
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/// <param name="length">The number of bytes in <paramref name="input"/> to take into account.</param>
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/// <param name="paddinglength">The number of bytes to pad the input with.</param>
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/// <returns>
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/// The padded data array.
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/// </returns>
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public override byte[] Pad(byte[] input, int offset, int length, int paddinglength)
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{
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var output = new byte[length + paddinglength];
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Buffer.BlockCopy(input, offset, output, 0, length);
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for (var i = 0; i < paddinglength; i++)
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{
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output[length + i] = (byte) paddinglength;
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}
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return output;
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}
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}
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}
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