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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Hazel.Dtls
{
/// <summary>
/// Passthrough record protection implementaion
/// </summary>
public class NullRecordProtection : IRecordProtection
{
public readonly static NullRecordProtection Instance = new NullRecordProtection();
public void Dispose()
{
}
public int GetEncryptedSize(int dataSize)
{
return dataSize;
}
public int GetDecryptedSize(int dataSize)
{
return dataSize;
}
public void EncryptServerPlaintext(ByteSpan output, ByteSpan input, ref Record record)
{
CopyMaybeOverlappingSpans(output, input);
}
public void EncryptClientPlaintext(ByteSpan output, ByteSpan input, ref Record record)
{
CopyMaybeOverlappingSpans(output, input);
}
public bool DecryptCiphertextFromServer(ByteSpan output, ByteSpan input, ref Record record)
{
CopyMaybeOverlappingSpans(output, input);
return true;
}
public bool DecryptCiphertextFromClient(ByteSpan output, ByteSpan input, ref Record record)
{
CopyMaybeOverlappingSpans(output, input);
return true;
}
private static void CopyMaybeOverlappingSpans(ByteSpan output, ByteSpan input)
{
// Early out if the ranges `output` is equal to `input`
if (output.GetUnderlyingArray() == input.GetUnderlyingArray())
{
if (output.Offset == input.Offset && output.Length == input.Length)
{
return;
}
}
input.CopyTo(output);
}
}
}
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