public static byte[] Decrypt(byte[] CipherText, byte[] Nonce, byte[] PublicKey, byte[] SecretKey)
{
var PlainText = new byte[CipherText.Length - 16];
var Result = SodiumLibrary.crypto_box_open_easy(PlainText, CipherText, CipherText.Length, Nonce, PublicKey, SecretKey);
return(Result == 0 ? PlainText : throw new CryptographicException());
}
/// <summary>
/// This function can be used to compute a shared secret given a user's secret key and another user's public key.
/// </summary>
/// <see cref="https://libsodium.gitbook.io/doc/advanced/scalar_multiplication#usage"/>
public static byte[] ScalarMultiplication(byte[] SecretKey, byte[] PublicKey)
{
var SharedKey = new byte[SecretKey.Length];
var Result = SodiumLibrary.crypto_scalarmult(SharedKey, SecretKey, PublicKey);
return(Result == 0 ? SharedKey : throw new CryptographicException());
}
public static byte[] KeyExchange(byte[] PublicKey, byte[] SecretKey)
{
var SharedKey = new byte[32];
var Result = SodiumLibrary.crypto_box_beforenm(SharedKey, PublicKey, SecretKey);
return(Result == 0 ? SharedKey : throw new CryptographicException());
}
public static byte[] Decrypt(byte[] CipherText, byte[] Nonce, byte[] SharedKey)
{
var PlainText = new byte[CipherText.Length - 16];
var Result = SodiumLibrary.crypto_box_curve25519xchacha20poly1305_open_easy_afternm(PlainText, CipherText, CipherText.Length, Nonce, SharedKey);
return(Result == 0 ? PlainText : throw new CryptographicException());
}
public static byte[] Encrypt(byte[] Message, byte[] Nonce, byte[] PublicKey, byte[] SecretKey)
{
var CipherText = new byte[Message.Length + 16];
var Result = SodiumLibrary.crypto_box_curve25519xchacha20poly1305_easy(CipherText, Message, Message.Length, Nonce, PublicKey, SecretKey);
return(Result == 0 ? CipherText : throw new CryptographicException());
}
public static byte[] Encrypt(byte[] Message, byte[] Nonce, byte[] SharedKey)
{
var CipherText = new byte[Message.Length + 16];
var Result =
SodiumLibrary.crypto_box_easy_afternm(CipherText, Message, Message.Length,
Nonce, SharedKey);
return(Result == 0 ? CipherText : throw new CryptographicException());
}
public static byte[] Hash(byte[] Data, byte[] Key, byte[] Nonce)
{
if (Key.Length < 32)
{
throw new ArgumentException("Key Length Must Be 32 Bytes.", nameof(Key));
}
if (Nonce.Length < 16)
{
throw new ArgumentException("Nonce Length Must Be 16 Bytes.", nameof(Nonce));
}
var Hash = new byte[Data.Length];
var Result = SodiumLibrary.crypto_core_hchacha20(Hash, Data, Key, Nonce);
return(Result == 0 ? Hash : throw new CryptographicException());
}
