94 lines
2.5 KiB
C#
94 lines
2.5 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.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 ISO10126-2 padding to a block.
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*/
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public class ISO10126d2Padding: IBlockCipherPadding
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{
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private SecureRandom random;
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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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//throws ArgumentException
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{
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this.random = CryptoServicesRegistrar.GetSecureRandom(random);
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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 "ISO10126-2"; }
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}
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public int AddPadding(byte[] input, int inOff)
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{
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int count = input.Length - inOff;
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if (count > 1)
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{
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random.NextBytes(input, inOff, count - 1);
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}
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input[input.Length - 1] = (byte)count;
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return count;
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}
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#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || _UNITY_2021_2_OR_NEWER_
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public int AddPadding(Span<byte> block, int position)
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{
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int count = block.Length - position;
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if (count > 1)
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{
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random.NextBytes(block[position..(block.Length - 1)]);
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}
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block[block.Length - 1] = (byte)count;
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return count;
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}
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#endif
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public int PadCount(byte[] input)
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{
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int count = input[input.Length -1];
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int position = input.Length - count;
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int failed = (position | (count - 1)) >> 31;
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if (failed != 0)
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throw new InvalidCipherTextException("pad block corrupted");
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return count;
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}
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#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || _UNITY_2021_2_OR_NEWER_
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public int PadCount(ReadOnlySpan<byte> block)
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{
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int count = block[block.Length - 1];
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int position = block.Length - count;
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int failed = (position | (count - 1)) >> 31;
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if (failed != 0)
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throw new InvalidCipherTextException("pad block corrupted");
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return count;
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}
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#endif
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}
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}
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#pragma warning restore
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#endif
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