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using System;
namespace Hazel.Dtls
{
/// <summary>
/// DTLS cipher suite interface for protection of record payload.
/// </summary>
public interface IRecordProtection : IDisposable
{
/// <summary>
/// Calculate the size of an encrypted plaintext
/// </summary>
/// <param name="dataSize">Size of plaintext in bytes</param>
/// <returns>Size of encrypted ciphertext in bytes</returns>
int GetEncryptedSize(int dataSize);
/// <summary>
/// Calculate the size of decrypted ciphertext
/// </summary>
/// <param name="dataSize">Size of ciphertext in bytes</param>
/// <returns>Size of decrypted plaintext in bytes</returns>
int GetDecryptedSize(int dataSize);
/// <summary>
/// Encrypt a plaintext intput with server keys
///
/// Output may overlap with input.
/// </summary>
/// <param name="output">Output ciphertext</param>
/// <param name="input">Input plaintext</param>
/// <param name="record">Parent DTLS record</param>
void EncryptServerPlaintext(ByteSpan output, ByteSpan input, ref Record record);
/// <summary>
/// Encrypt a plaintext intput with client keys
///
/// Output may overlap with input.
/// </summary>
/// <param name="output">Output ciphertext</param>
/// <param name="input">Input plaintext</param>
/// <param name="record">Parent DTLS record</param>
void EncryptClientPlaintext(ByteSpan output, ByteSpan input, ref Record record);
/// <summary>
/// Decrypt a ciphertext intput with server keys
///
/// Output may overlap with input.
/// </summary>
/// <param name="output">Output plaintext</param>
/// <param name="input">Input ciphertext</param>
/// <param name="record">Parent DTLS record</param>
/// <returns>True if the input was authenticated and decrypted. Otherwise false</returns>
bool DecryptCiphertextFromServer(ByteSpan output, ByteSpan input, ref Record record);
/// <summary>
/// Decrypt a ciphertext intput with client keys
///
/// Output may overlap with input.
/// </summary>
/// <param name="output">Output plaintext</param>
/// <param name="input">Input ciphertext</param>
/// <param name="record">Parent DTLS record</param>
/// <returns>True if the input was authenticated and decrypted. Otherwise false</returns>
bool DecryptCiphertextFromClient(ByteSpan output, ByteSpan input, ref Record record);
}
/// <summary>
/// Factory to create record protection from cipher suite identifiers
/// </summary>
public sealed class RecordProtectionFactory
{
public static IRecordProtection Create(CipherSuite cipherSuite, ByteSpan masterSecret, ByteSpan serverRandom, ByteSpan clientRandom)
{
switch (cipherSuite)
{
case CipherSuite.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256:
return new Aes128GcmRecordProtection(masterSecret, serverRandom, clientRandom);
default:
return null;
}
}
}
}
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