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* Remove useless runtime check (we only support one) * Remove unused args * Remove a global constant And ofc fix some warnings ;)
168 lines
5.6 KiB
C#
168 lines
5.6 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.IO;
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using System.Security.Cryptography;
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using System.Text;
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using MediaBrowser.Model.Cryptography;
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namespace Emby.Server.Implementations.Cryptography
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{
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public class CryptographyProvider : ICryptoProvider
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{
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private static readonly HashSet<string> _supportedHashMethods = new HashSet<string>()
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{
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"MD5",
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"System.Security.Cryptography.MD5",
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"SHA",
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"SHA1",
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"System.Security.Cryptography.SHA1",
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"SHA256",
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"SHA-256",
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"System.Security.Cryptography.SHA256",
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"SHA384",
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"SHA-384",
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"System.Security.Cryptography.SHA384",
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"SHA512",
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"SHA-512",
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"System.Security.Cryptography.SHA512"
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};
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public string DefaultHashMethod => "PBKDF2";
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private RandomNumberGenerator _randomNumberGenerator;
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private const int _defaultIterations = 1000;
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public CryptographyProvider()
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{
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//FIXME: When we get DotNet Standard 2.1 we need to revisit how we do the crypto
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//Currently supported hash methods from https://docs.microsoft.com/en-us/dotnet/api/system.security.cryptography.cryptoconfig?view=netcore-2.1
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//there might be a better way to autogenerate this list as dotnet updates, but I couldn't find one
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//Please note the default method of PBKDF2 is not included, it cannot be used to generate hashes cleanly as it is actually a pbkdf with sha1
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_randomNumberGenerator = RandomNumberGenerator.Create();
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}
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public Guid GetMD5(string str)
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{
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return new Guid(ComputeMD5(Encoding.Unicode.GetBytes(str)));
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}
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public byte[] ComputeSHA1(byte[] bytes)
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{
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using (var provider = SHA1.Create())
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{
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return provider.ComputeHash(bytes);
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}
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}
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public byte[] ComputeMD5(Stream str)
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{
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using (var provider = MD5.Create())
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{
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return provider.ComputeHash(str);
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}
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}
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public byte[] ComputeMD5(byte[] bytes)
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{
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using (var provider = MD5.Create())
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{
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return provider.ComputeHash(bytes);
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}
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}
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public IEnumerable<string> GetSupportedHashMethods()
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{
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return _supportedHashMethods;
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}
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private byte[] PBKDF2(string method, byte[] bytes, byte[] salt, int iterations)
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{
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//downgrading for now as we need this library to be dotnetstandard compliant
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//with this downgrade we'll add a check to make sure we're on the downgrade method at the moment
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if (method == DefaultHashMethod)
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{
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using (var r = new Rfc2898DeriveBytes(bytes, salt, iterations))
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{
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return r.GetBytes(32);
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}
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}
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throw new CryptographicException($"Cannot currently use PBKDF2 with requested hash method: {method}");
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}
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public byte[] ComputeHash(string hashMethod, byte[] bytes)
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{
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return ComputeHash(hashMethod, bytes, Array.Empty<byte>());
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}
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public byte[] ComputeHashWithDefaultMethod(byte[] bytes)
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{
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return ComputeHash(DefaultHashMethod, bytes);
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}
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public byte[] ComputeHash(string hashMethod, byte[] bytes, byte[] salt)
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{
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if (hashMethod == DefaultHashMethod)
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{
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return PBKDF2(hashMethod, bytes, salt, _defaultIterations);
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}
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else if (_supportedHashMethods.Contains(hashMethod))
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{
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using (var h = HashAlgorithm.Create(hashMethod))
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{
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if (salt.Length == 0)
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{
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return h.ComputeHash(bytes);
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}
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else
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{
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byte[] salted = new byte[bytes.Length + salt.Length];
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Array.Copy(bytes, salted, bytes.Length);
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Array.Copy(salt, 0, salted, bytes.Length, salt.Length);
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return h.ComputeHash(salted);
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}
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}
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}
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else
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{
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throw new CryptographicException($"Requested hash method is not supported: {hashMethod}");
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}
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}
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public byte[] ComputeHashWithDefaultMethod(byte[] bytes, byte[] salt)
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{
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return PBKDF2(DefaultHashMethod, bytes, salt, _defaultIterations);
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}
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public byte[] ComputeHash(PasswordHash hash)
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{
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int iterations = _defaultIterations;
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if (!hash.Parameters.ContainsKey("iterations"))
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{
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hash.Parameters.Add("iterations", _defaultIterations.ToString(CultureInfo.InvariantCulture));
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}
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else
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{
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try
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{
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iterations = int.Parse(hash.Parameters["iterations"]);
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}
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catch (Exception e)
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{
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throw new InvalidDataException($"Couldn't successfully parse iterations value from string: {hash.Parameters["iterations"]}", e);
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}
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}
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return PBKDF2(hash.Id, hash.HashBytes, hash.SaltBytes, iterations);
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}
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public byte[] GenerateSalt()
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{
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byte[] salt = new byte[64];
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_randomNumberGenerator.GetBytes(salt);
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return salt;
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}
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}
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}
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