public void Test_02_A5_Decrypt()
{
// §A.5
byte[] Key = Hashes.StringToBinary("1c9240a5eb55d38af333888604f6b5f0473917c1402b80099dca5cbc207075c0");
byte[] CipherText = Hashes.StringToBinary("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");
byte[] Nonce = Hashes.StringToBinary("000000000102030405060708");
byte[] AdditionalData = Hashes.StringToBinary("f33388860000000000004e91");
byte[] Mac = Hashes.StringToBinary("eead9d67890cbb22392336fea1851f38");
AeadChaCha20Poly1305 Cipher = new AeadChaCha20Poly1305(Key, Nonce);
byte[] PlainText = Cipher.Decrypt(CipherText, AdditionalData, Mac);
Assert.IsNotNull(PlainText);
Assert.AreEqual("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", Hashes.BinaryToString(PlainText));
}
/// <summary>
/// Decrypts the data.
/// </summary>
/// <returns>Null if the provided Mac doesn't match the calculated Mac</returns>
public static byte[] Decrypt(byte[] data, byte[] nonce, byte[] mac)
{
var chacha = new AeadChaCha20Poly1305(Key, nonce);
return(chacha.Decrypt(data, Array.Empty <byte>(), mac));
}