81 lines
2.0 KiB
C#
81 lines
2.0 KiB
C#
#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
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#pragma warning disable
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using System;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Security;
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namespace BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Paddings
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{
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/**
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* A padder that adds Pkcs7/Pkcs5 padding to a block.
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*/
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public class Pkcs7Padding
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: IBlockCipherPadding
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{
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/**
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* Initialise the padder.
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*
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* @param random - a SecureRandom if available.
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*/
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public void Init(
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SecureRandom random)
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{
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// nothing to do.
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}
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/**
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* Return the name of the algorithm the cipher implements.
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*
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* @return the name of the algorithm the cipher implements.
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*/
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public string PaddingName
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{
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get { return "PKCS7"; }
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}
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/**
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* add the pad bytes to the passed in block, returning the
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* number of bytes added.
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*/
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public int AddPadding(
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byte[] input,
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int inOff)
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{
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byte code = (byte)(input.Length - inOff);
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while (inOff < input.Length)
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{
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input[inOff] = code;
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inOff++;
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}
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return code;
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}
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/**
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* return the number of pad bytes present in the block.
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*/
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public int PadCount(
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byte[] input)
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{
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byte countAsByte = input[input.Length - 1];
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int count = countAsByte;
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if (count < 1 || count > input.Length)
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throw new InvalidCipherTextException("pad block corrupted");
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for (int i = 2; i <= count; i++)
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{
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if (input[input.Length - i] != countAsByte)
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throw new InvalidCipherTextException("pad block corrupted");
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}
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return count;
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}
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}
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}
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#pragma warning restore
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#endif
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