/// <summary>
/// Diffie-Hellman (function computes the public key)
/// </summary>
/// <param name="secretKey">A secret key.</param>
/// <returns>A computed public key.</returns>
/// <exception cref="KeyOutOfRangeException"></exception>
public static byte[] Base(byte[] secretKey)
{
//validate the length of the scalar
if (secretKey == null || secretKey.Length != SCALAR_BYTES)
{
throw new KeyOutOfRangeException("secretKey", secretKey == null ? 0 : secretKey.Length,
string.Format("secretKey must be {0} bytes in length.", SCALAR_BYTES));
}
var publicKey = new byte[SCALAR_BYTES];
SodiumLibrary.crypto_scalarmult_base(publicKey, secretKey);
return(publicKey);
}