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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Text;
namespace Microsoft.AspNetCore.Session;
// Keys are stored in their utf-8 encoded state.
// This saves us from de-serializing and re-serializing every key on every request.
internal sealed class EncodedKey
{
private string? _keyString;
private int? _hashCode;
internal EncodedKey(string key)
{
_keyString = key;
KeyBytes = Encoding.UTF8.GetBytes(key);
}
public EncodedKey(byte[] key)
{
KeyBytes = key;
}
internal string KeyString
{
get
{
if (_keyString == null)
{
_keyString = Encoding.UTF8.GetString(KeyBytes, 0, KeyBytes.Length);
}
return _keyString;
}
}
internal byte[] KeyBytes { get; private set; }
public override bool Equals(object? obj)
{
var otherKey = obj as EncodedKey;
if (otherKey == null)
{
return false;
}
if (KeyBytes.Length != otherKey.KeyBytes.Length)
{
return false;
}
if (_hashCode.HasValue && otherKey._hashCode.HasValue
&& _hashCode.Value != otherKey._hashCode.Value)
{
return false;
}
for (int i = 0; i < KeyBytes.Length; i++)
{
if (KeyBytes[i] != otherKey.KeyBytes[i])
{
return false;
}
}
return true;
}
public override int GetHashCode()
{
if (!_hashCode.HasValue)
{
_hashCode = SipHash.GetHashCode(KeyBytes);
}
return _hashCode.Value;
}
public override string ToString()
{
return KeyString;
}
}
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