/// <summary>
/// Encrypts binary data
/// </summary>
/// <param name="Data">Data to encrypt.</param>
/// <param name="Encrypted">Encrypted data will be stored here.</param>
/// <param name="Key">Encryption Key</param>
/// <param name="IV">Initiation Vector</param>
/// <param name="AssociatedData">Any associated data used for authenticated encryption (AEAD).</param>
public override async Task Encrypt(Stream Data, Stream Encrypted, byte[] Key, byte[] IV, byte[] AssociatedData)
{
Security.ChaChaPoly.AeadChaCha20Poly1305 Acp = new Security.ChaChaPoly.AeadChaCha20Poly1305(Key, IV);
byte[] Mac = await Acp.Encrypt(Data, Encrypted, AssociatedData);
await Encrypted.WriteAsync(Mac, 0, 16);
}
/// <summary>
/// Encrypts binary data
/// </summary>
/// <param name="Data">Binary Data</param>
/// <param name="Key">Encryption Key</param>
/// <param name="IV">Initiation Vector</param>
/// <param name="AssociatedData">Any associated data used for authenticated encryption (AEAD).</param>
/// <returns>Encrypted Data</returns>
public override byte[] Encrypt(byte[] Data, byte[] Key, byte[] IV, byte[] AssociatedData)
{
Security.ChaChaPoly.AeadChaCha20Poly1305 Acp = new Security.ChaChaPoly.AeadChaCha20Poly1305(Key, IV);
byte[] Encrypted = Acp.Encrypt(Data, AssociatedData, out byte[] Mac);
int c = Encrypted.Length;
Array.Resize <byte>(ref Encrypted, c + 16);
Array.Copy(Mac, 0, Encrypted, c, 16);
return(Encrypted);
}
/// <summary>
/// Decrypts binary data
/// </summary>
/// <param name="Data">Binary Data</param>
/// <param name="Key">Encryption Key</param>
/// <param name="IV">Initiation Vector</param>
/// <param name="AssociatedData">Any associated data used for authenticated encryption (AEAD).</param>
/// <returns>Decrypted Data</returns>
public override byte[] Decrypt(byte[] Data, byte[] Key, byte[] IV, byte[] AssociatedData)
{
int c = Data.Length;
if (c < 16)
{
return(null);
}
Security.ChaChaPoly.AeadChaCha20Poly1305 Acp = new Security.ChaChaPoly.AeadChaCha20Poly1305(Key, IV);
byte[] Mac = new byte[16];
Array.Copy(Data, c - 16, Mac, 0, 16);
Array.Resize <byte>(ref Data, c - 16);
return(Acp.Decrypt(Data, AssociatedData, Mac));
}
/// <summary>
/// Decrypts binary data
/// </summary>
/// <param name="Data">Binary Data</param>
/// <param name="Key">Encryption Key</param>
/// <param name="IV">Initiation Vector</param>
/// <param name="AssociatedData">Any associated data used for authenticated encryption (AEAD).</param>
/// <returns>Decrypted Data</returns>
public override async Task <Stream> Decrypt(Stream Data, byte[] Key, byte[] IV, byte[] AssociatedData)
{
long c = Data.Length;
if (c < 16)
{
return(null);
}
Security.ChaChaPoly.AeadChaCha20Poly1305 Acp = new Security.ChaChaPoly.AeadChaCha20Poly1305(Key, IV);
using (TemporaryStream Temp = new TemporaryStream())
{
Data.Position = 0;
await Crypto.CopyAsync(Data, Temp, c - 16);
byte[] Mac = new byte[16];
await Data.ReadAsync(Mac, 0, 16);
Temp.Position = 0;
return(await Acp.Decrypt(Temp, AssociatedData, Mac));
}
}
