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Hashing

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This commit is contained in:
Matt Nadareski
2020-06-05 22:26:44 -07:00
parent 916d2a3b51
commit ac2a9fabb7
37 changed files with 722 additions and 269 deletions
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SabreTools.Library/Tools/Hasher.cs Normal file
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
using SabreTools.Library.Data;
namespace SabreTools.Library.Tools
{
public class Hasher
{
public Hash HashType { get; private set; }
private IDisposable _hasher;
public Hasher(Hash hashType)
{
this.HashType = hashType;
GetHasher();
}
/// <summary>
/// Generate the correct hashing class based on the hash type
/// </summary>
private void GetHasher()
{
switch (HashType)
{
case Hash.CRC:
_hasher = new OptimizedCRC();
break;
case Hash.MD5:
_hasher = MD5.Create();
break;
#if NET_FRAMEWORK
case Hash.RIPEMD160:
_hasher = RIPEMD160.Create();
break;
#endif
case Hash.SHA1:
_hasher = SHA1.Create();
break;
case Hash.SHA256:
_hasher = SHA256.Create();
break;
case Hash.SHA384:
_hasher = SHA384.Create();
break;
case Hash.SHA512:
_hasher = SHA512.Create();
break;
}
}
public void Dispose()
{
_hasher.Dispose();
}
public async Task Process(byte[] buffer, int size)
{
switch (HashType)
{
case Hash.CRC:
await Task.Run(() => (_hasher as OptimizedCRC).Update(buffer, 0, size));
break;
case Hash.MD5:
#if NET_FRAMEWORK
case Hash.RIPEMD160:
#endif
case Hash.RIPEMD160:
case Hash.SHA1:
case Hash.SHA256:
case Hash.SHA384:
case Hash.SHA512:
await Task.Run(() => (_hasher as HashAlgorithm).TransformBlock(buffer, 0, size, null, 0));
break;
}
}
public async Task Finalize()
{
byte[] emptyBuffer = new byte[0];
switch (HashType)
{
case Hash.CRC:
await Task.Run(() => (_hasher as OptimizedCRC).Update(emptyBuffer, 0, 0));
break;
case Hash.MD5:
#if NET_FRAMEWORK
case Hash.RIPEMD160:
#endif
case Hash.SHA1:
case Hash.SHA256:
case Hash.SHA384:
case Hash.SHA512:
await Task.Run(() => (_hasher as HashAlgorithm).TransformFinalBlock(emptyBuffer, 0, 0));
break;
}
}
public byte[] GetHash()
{
switch (HashType)
{
case Hash.CRC:
return BitConverter.GetBytes((_hasher as OptimizedCRC).Value).Reverse().ToArray();
case Hash.MD5:
#if NET_FRAMEWORK
case Hash.RIPEMD160:
#endif
case Hash.SHA1:
case Hash.SHA256:
case Hash.SHA384:
case Hash.SHA512:
return (_hasher as HashAlgorithm).Hash;
}
return null;
}
}
}