102 lines
2.6 KiB
C#
102 lines
2.6 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 the padding according to the scheme referenced in
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* ISO 7814-4 - scheme 2 from ISO 9797-1. The first byte is 0x80, rest is 0x00
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*/
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public class ISO7816d4Padding
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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 padder implements.
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*
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* @return the name of the algorithm the padder implements.
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*/
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public string PaddingName
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{
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get { return "ISO7816-4"; }
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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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input[inOff]= 0x80;
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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 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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block[position++] = 0x80;
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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 position = -1, 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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int match80Mask = ((next ^ 0x80) - 1) >> 31;
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position ^= (i ^ position) & still00Mask & match80Mask;
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still00Mask &= match00Mask;
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}
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if (position < 0)
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throw new InvalidCipherTextException("pad block corrupted");
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return input.Length - position;
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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 position = -1, 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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int match80Mask = ((next ^ 0x80) - 1) >> 31;
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position ^= (i ^ position) & still00Mask & match80Mask;
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still00Mask &= match00Mask;
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}
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if (position < 0)
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throw new InvalidCipherTextException("pad block corrupted");
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return block.Length - position;
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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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