private static StreamEncryptor CreateEncryptor(string algorithm, byte[] key, byte[] nonce)
{
switch (algorithm)
{
case "AES-SIV": return(StreamEncryptor.CreateAesCmacSivEncryptor(key, nonce));
case "AES-PMAC-SIV": return(StreamEncryptor.CreateAesPmacSivEncryptor(key, nonce));
default: throw new ArgumentException("Unknown algorithm.");
}
}
private static void StreamExample()
{
// Messages to encrypt.
var messages = new List <string> {
"Now that the party is jumping",
"With the bass kicked in, the fingers are pumpin'",
"Quick to the point, to the point no faking",
"I'm cooking MC's like a pound of bacon"
};
// Create a 32-byte key.
var key = Aead.GenerateKey256();
// Create a 8-byte STREAM nonce (required).
var nonce = StreamEncryptor.GenerateNonce();
// Create STREAM encryptor and decryptor using the AES-CMAC-SIV
// algorithm. They implement the IDisposable interface,
// so it's best to create them inside using statement.
using (var encryptor = StreamEncryptor.CreateAesCmacSivEncryptor(key, nonce))
using (var decryptor = StreamDecryptor.CreateAesCmacSivDecryptor(key, nonce))
{
for (int i = 0; i < messages.Count; ++i)
{
// Calculate whether the message is the last message to encrypt.
bool last = i == messages.Count - 1;
// Convert the message to byte array first.
var bytes = Encoding.UTF8.GetBytes(messages[i]);
// Encrypt the message.
var ciphertext = encryptor.Seal(bytes, null, last);
// Decrypt the message.
var message = decryptor.Open(ciphertext, null, last);
// Convert the message back to string.
var plaintext = Encoding.UTF8.GetString(bytes);
// Print the decrypted message to the standard output.
Console.WriteLine(plaintext);
}
}
}