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Hasher.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Threading.Tasks;
namespace TlsClientStream
{
internal abstract class Hasher : IDisposable
{
internal static byte[] EmptyByteArray = new byte[0];
public abstract void Initialize();
public abstract void Update(byte[] arr, int offset, int len);
public abstract byte[] Final();
public abstract void Dispose();
#if !(NET45 || NET451)
public static HashAlgorithmName GetHashAlgorithmName(TLSHashAlgorithm hashAlgorithm)
{
switch (hashAlgorithm)
{
case TLSHashAlgorithm.MD5: return HashAlgorithmName.MD5;
case TLSHashAlgorithm.SHA1: return HashAlgorithmName.SHA1;
case TLSHashAlgorithm.SHA256: return HashAlgorithmName.SHA256;
case TLSHashAlgorithm.SHA384: return HashAlgorithmName.SHA384;
case TLSHashAlgorithm.SHA512: return HashAlgorithmName.SHA512;
default: throw new NotSupportedException();
}
}
#endif
public static Hasher Create(TLSHashAlgorithm hashAlgorithm)
{
switch (hashAlgorithm)
{
#if NET45 || NET451
case TLSHashAlgorithm.MD5: return new HashAlgorithmHasher(new MD5CryptoServiceProvider());
case TLSHashAlgorithm.SHA1: return new HashAlgorithmHasher(new SHA1CryptoServiceProvider());
case TLSHashAlgorithm.SHA256: return new HashAlgorithmHasher(new SHA256CryptoServiceProvider());
case TLSHashAlgorithm.SHA384: return new HashAlgorithmHasher(new SHA384CryptoServiceProvider());
case TLSHashAlgorithm.SHA512: return new HashAlgorithmHasher(new SHA512CryptoServiceProvider());
case TLSHashAlgorithm.MD5SHA1: return new HashAlgorithmHasher(new MD5SHA1());
default: throw new NotSupportedException();
#else
case TLSHashAlgorithm.MD5: return new IncrementalHashHasher(HashAlgorithmName.MD5);
case TLSHashAlgorithm.SHA1: return new IncrementalHashHasher(HashAlgorithmName.SHA1);
case TLSHashAlgorithm.SHA256: return new IncrementalHashHasher(HashAlgorithmName.SHA256);
case TLSHashAlgorithm.SHA384: return new IncrementalHashHasher(HashAlgorithmName.SHA384);
case TLSHashAlgorithm.SHA512: return new IncrementalHashHasher(HashAlgorithmName.SHA512);
case TLSHashAlgorithm.MD5SHA1: return new MD5SHA1IncrementalHasher();
default: throw new NotSupportedException();
#endif
}
}
#if NET45 || NET451
private class HashAlgorithmHasher : Hasher
{
private HashAlgorithm _hashAlgorithm;
internal HashAlgorithmHasher(HashAlgorithm hashAlgorithm)
{
_hashAlgorithm = hashAlgorithm;
}
public override void Dispose()
{
_hashAlgorithm.Dispose();
}
public override byte[] Final()
{
_hashAlgorithm.TransformFinalBlock(EmptyByteArray, 0, 0);
return _hashAlgorithm.Hash;
}
public override void Initialize()
{
_hashAlgorithm.Initialize();
}
public override void Update(byte[] arr, int offset, int len)
{
_hashAlgorithm.TransformBlock(arr, offset, len);
}
}
#else
private class IncrementalHashHasher : Hasher
{
private IncrementalHash _incrementalHash;
internal IncrementalHashHasher(HashAlgorithmName hashAlgorithmName)
{
_incrementalHash = IncrementalHash.CreateHash(hashAlgorithmName);
}
public override void Dispose()
{
_incrementalHash.Dispose();
}
public override byte[] Final()
{
return _incrementalHash.GetHashAndReset();
}
public override void Initialize()
{
}
public override void Update(byte[] arr, int offset, int len)
{
_incrementalHash.AppendData(arr, offset, len);
}
}
private class MD5SHA1IncrementalHasher : Hasher
{
private IncrementalHash _md5;
private IncrementalHash _sha1;
internal MD5SHA1IncrementalHasher()
{
_md5 = IncrementalHash.CreateHash(HashAlgorithmName.MD5);
_sha1 = IncrementalHash.CreateHash(HashAlgorithmName.SHA1);
}
public override void Dispose()
{
_md5.Dispose();
_sha1.Dispose();
}
public override byte[] Final()
{
byte[] hash = new byte[36];
var md5Hash = _md5.GetHashAndReset();
var sha1Hash = _sha1.GetHashAndReset();
Buffer.BlockCopy(md5Hash, 0, hash, 0, 16);
Buffer.BlockCopy(sha1Hash, 0, hash, 16, 20);
Array.Clear(md5Hash, 0, 16);
Array.Clear(sha1Hash, 0, 20);
return hash;
}
public override void Initialize()
{
}
public override void Update(byte[] arr, int offset, int len)
{
_md5.AppendData(arr, offset, len);
_sha1.AppendData(arr, offset, len);
}
}
#endif
}
}