142 lines
4.6 KiB
C#
142 lines
4.6 KiB
C#
using System;
|
|
using System.Collections.Generic;
|
|
using System.IO;
|
|
using System.Security.Cryptography;
|
|
using System.Text;
|
|
using MediaBrowser.Model.Cryptography;
|
|
|
|
namespace Emby.Server.Implementations.Cryptography
|
|
{
|
|
public class CryptographyProvider : ICryptoProvider
|
|
{
|
|
private HashSet<string> SupportedHashMethods;
|
|
public string DefaultHashMethod => "SHA256";
|
|
private RandomNumberGenerator rng;
|
|
private int defaultiterations = 1000;
|
|
public CryptographyProvider()
|
|
{
|
|
//Currently supported hash methods from https://docs.microsoft.com/en-us/dotnet/api/system.security.cryptography.cryptoconfig?view=netcore-2.1
|
|
//there might be a better way to autogenerate this list as dotnet updates, but I couldn't find one
|
|
SupportedHashMethods = new HashSet<string>()
|
|
{
|
|
"MD5"
|
|
,"System.Security.Cryptography.MD5"
|
|
,"SHA"
|
|
,"SHA1"
|
|
,"System.Security.Cryptography.SHA1"
|
|
,"SHA256"
|
|
,"SHA-256"
|
|
,"System.Security.Cryptography.SHA256"
|
|
,"SHA384"
|
|
,"SHA-384"
|
|
,"System.Security.Cryptography.SHA384"
|
|
,"SHA512"
|
|
,"SHA-512"
|
|
,"System.Security.Cryptography.SHA512"
|
|
};
|
|
rng = RandomNumberGenerator.Create();
|
|
}
|
|
|
|
public Guid GetMD5(string str)
|
|
{
|
|
return new Guid(ComputeMD5(Encoding.Unicode.GetBytes(str)));
|
|
}
|
|
|
|
public byte[] ComputeSHA1(byte[] bytes)
|
|
{
|
|
using (var provider = SHA1.Create())
|
|
{
|
|
return provider.ComputeHash(bytes);
|
|
}
|
|
}
|
|
|
|
public byte[] ComputeMD5(Stream str)
|
|
{
|
|
using (var provider = MD5.Create())
|
|
{
|
|
return provider.ComputeHash(str);
|
|
}
|
|
}
|
|
|
|
public byte[] ComputeMD5(byte[] bytes)
|
|
{
|
|
using (var provider = MD5.Create())
|
|
{
|
|
return provider.ComputeHash(bytes);
|
|
}
|
|
}
|
|
|
|
public IEnumerable<string> GetSupportedHashMethods()
|
|
{
|
|
return SupportedHashMethods;
|
|
}
|
|
|
|
private byte[] PBKDF2(string method, byte[] bytes, byte[] salt, int iterations)
|
|
{
|
|
using (var r = new Rfc2898DeriveBytes(bytes, salt, iterations, new HashAlgorithmName(method)))
|
|
{
|
|
return r.GetBytes(32);
|
|
}
|
|
}
|
|
|
|
public byte[] ComputeHash(string HashMethod, byte[] bytes)
|
|
{
|
|
return ComputeHash(HashMethod, bytes, new byte[0]);
|
|
}
|
|
|
|
public byte[] ComputeHashWithDefaultMethod(byte[] bytes)
|
|
{
|
|
return ComputeHash(DefaultHashMethod, bytes);
|
|
}
|
|
|
|
public byte[] ComputeHash(string HashMethod, byte[] bytes, byte[] salt)
|
|
{
|
|
if (SupportedHashMethods.Contains(HashMethod))
|
|
{
|
|
if (salt.Length == 0)
|
|
{
|
|
using (var h = HashAlgorithm.Create(HashMethod))
|
|
{
|
|
return h.ComputeHash(bytes);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
return PBKDF2(HashMethod, bytes, salt,defaultiterations);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
throw new CryptographicException(String.Format("Requested hash method is not supported: {0}", HashMethod));
|
|
}
|
|
}
|
|
|
|
public byte[] ComputeHashWithDefaultMethod(byte[] bytes, byte[] salt)
|
|
{
|
|
return PBKDF2(DefaultHashMethod, bytes, salt, defaultiterations);
|
|
}
|
|
|
|
public byte[] ComputeHash(PasswordHash hash)
|
|
{
|
|
int iterations = defaultiterations;
|
|
if (!hash.Parameters.ContainsKey("iterations"))
|
|
{
|
|
hash.Parameters.Add("iterations", defaultiterations.ToString());
|
|
}
|
|
else
|
|
{
|
|
try { iterations = int.Parse(hash.Parameters["iterations"]); }
|
|
catch (Exception e) { iterations = defaultiterations; throw new Exception($"Couldn't successfully parse iterations value from string:{hash.Parameters["iterations"]}", e); }
|
|
}
|
|
return PBKDF2(hash.Id, hash.HashBytes, hash.SaltBytes,iterations);
|
|
}
|
|
|
|
public byte[] GenerateSalt()
|
|
{
|
|
byte[] salt = new byte[64];
|
|
rng.GetBytes(salt);
|
|
return salt;
|
|
}
|
|
}
|
|
}
|