87 lines
2.4 KiB
C#
87 lines
2.4 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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/// <summary> A padder that adds Null byte padding to a block.</summary>
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public class ZeroBytePadding : IBlockCipherPadding
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{
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/// <summary> Return the name of the algorithm the cipher implements.
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///
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/// </summary>
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/// <returns> the name of the algorithm the cipher implements.
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/// </returns>
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public string PaddingName
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{
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get { return "ZeroBytePadding"; }
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}
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/// <summary> Initialise the padder.
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///
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/// </summary>
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/// <param name="random">- a SecureRandom if available.
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/// </param>
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public void Init(SecureRandom random)
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{
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// nothing to do.
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}
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public int AddPadding(byte[] input, int inOff)
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{
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int added = input.Length - inOff;
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while (inOff < input.Length)
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{
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input[inOff++] = 0x00;
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}
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return added;
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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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block[position..].Fill(0x00);
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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 = 0, still00Mask = -1;
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int i = input.Length;
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while (--i >= 0)
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{
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int next = input[i];
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int match00Mask = ((next ^ 0x00) - 1) >> 31;
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still00Mask &= match00Mask;
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count -= still00Mask;
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}
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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 = 0, still00Mask = -1;
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int i = block.Length;
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while (--i >= 0)
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{
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int next = block[i];
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int match00Mask = ((next ^ 0x00) - 1) >> 31;
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still00Mask &= match00Mask;
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count -= still00Mask;
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}
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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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