115 lines
3.0 KiB
C#
115 lines
3.0 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.Crypto.Parameters;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Utilities;
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namespace BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Tls
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{
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/**
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* HMAC implementation based on original internet draft for HMAC (RFC 2104)
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*
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* The difference is that padding is concatentated versus XORed with the key
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*
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* H(K + opad, H(K + ipad, text))
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*/
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public class Ssl3Mac
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: IMac
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{
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private const byte IPAD_BYTE = 0x36;
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private const byte OPAD_BYTE = 0x5C;
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internal static readonly byte[] IPAD = GenPad(IPAD_BYTE, 48);
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internal static readonly byte[] OPAD = GenPad(OPAD_BYTE, 48);
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private readonly IDigest digest;
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private readonly int padLength;
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private byte[] secret;
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/**
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* Base constructor for one of the standard digest algorithms that the byteLength of
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* the algorithm is know for. Behaviour is undefined for digests other than MD5 or SHA1.
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*
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* @param digest the digest.
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*/
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public Ssl3Mac(IDigest digest)
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{
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this.digest = digest;
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if (digest.GetDigestSize() == 20)
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{
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this.padLength = 40;
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}
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else
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{
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this.padLength = 48;
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}
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}
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public virtual string AlgorithmName
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{
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get { return digest.AlgorithmName + "/SSL3MAC"; }
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}
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public virtual void Init(ICipherParameters parameters)
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{
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secret = Arrays.Clone(((KeyParameter)parameters).GetKey());
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Reset();
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}
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public virtual int GetMacSize()
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{
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return digest.GetDigestSize();
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}
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public virtual void Update(byte input)
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{
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digest.Update(input);
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}
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public virtual void BlockUpdate(byte[] input, int inOff, int len)
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{
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digest.BlockUpdate(input, inOff, len);
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}
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public virtual int DoFinal(byte[] output, int outOff)
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{
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byte[] tmp = new byte[digest.GetDigestSize()];
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digest.DoFinal(tmp, 0);
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digest.BlockUpdate(secret, 0, secret.Length);
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digest.BlockUpdate(OPAD, 0, padLength);
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digest.BlockUpdate(tmp, 0, tmp.Length);
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int len = digest.DoFinal(output, outOff);
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Reset();
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return len;
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}
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/**
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* Reset the mac generator.
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*/
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public virtual void Reset()
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{
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digest.Reset();
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digest.BlockUpdate(secret, 0, secret.Length);
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digest.BlockUpdate(IPAD, 0, padLength);
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}
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private static byte[] GenPad(byte b, int count)
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{
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byte[] padding = new byte[count];
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Arrays.Fill(padding, b);
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return padding;
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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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