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78 lines
2.6 KiB
C#
78 lines
2.6 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.Security.Cryptography;
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using MediaBrowser.Model.Cryptography;
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using static MediaBrowser.Model.Cryptography.Constants;
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namespace Emby.Server.Implementations.Cryptography
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{
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/// <summary>
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/// Class providing abstractions over cryptographic functions.
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/// </summary>
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public class CryptographyProvider : ICryptoProvider
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{
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/// <inheritdoc />
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public string DefaultHashMethod => "PBKDF2-SHA512";
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/// <inheritdoc />
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public PasswordHash CreatePasswordHash(ReadOnlySpan<char> password)
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{
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byte[] salt = GenerateSalt();
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return new PasswordHash(
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DefaultHashMethod,
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Rfc2898DeriveBytes.Pbkdf2(
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password,
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salt,
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DefaultIterations,
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HashAlgorithmName.SHA512,
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DefaultOutputLength),
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salt,
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new Dictionary<string, string>
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{
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{ "iterations", DefaultIterations.ToString(CultureInfo.InvariantCulture) }
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});
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}
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/// <inheritdoc />
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public bool Verify(PasswordHash hash, ReadOnlySpan<char> password)
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{
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if (string.Equals(hash.Id, "PBKDF2", StringComparison.Ordinal))
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{
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return hash.Hash.SequenceEqual(
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Rfc2898DeriveBytes.Pbkdf2(
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password,
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hash.Salt,
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int.Parse(hash.Parameters["iterations"], CultureInfo.InvariantCulture),
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HashAlgorithmName.SHA1,
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32));
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}
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if (string.Equals(hash.Id, "PBKDF2-SHA512", StringComparison.Ordinal))
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{
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return hash.Hash.SequenceEqual(
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Rfc2898DeriveBytes.Pbkdf2(
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password,
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hash.Salt,
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int.Parse(hash.Parameters["iterations"], CultureInfo.InvariantCulture),
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HashAlgorithmName.SHA512,
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DefaultOutputLength));
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}
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throw new NotSupportedException($"Can't verify hash with id: {hash.Id}");
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}
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/// <inheritdoc />
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public byte[] GenerateSalt()
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=> GenerateSalt(DefaultSaltLength);
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/// <inheritdoc />
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public byte[] GenerateSalt(int length)
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{
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var salt = new byte[length];
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using var rng = RandomNumberGenerator.Create();
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rng.GetNonZeroBytes(salt);
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return salt;
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}
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}
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}
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