public static byte[] CalculateSignature(ECPrivateKey privateKey, byte[] message)
{
if (privateKey.GetKeyType () == DJB_TYPE) {
var sign = Sodium.SecretKeyAuth.SignHmacSha256 (message, privateKey.Serialize ());
return sign;
} else {
throw new Exception ("Unknown type");
}
}
public static byte[] CalculateAgreement(ECPublicKey publicKey, ECPrivateKey privateKey)
{
if (publicKey.GetKeyType () != privateKey.GetKeyType ()) {
throw new Exception ("Public and private keys must be of the same type!");
}
if (publicKey.GetKeyType () == DJB_TYPE) {
var sK = privateKey.Serialize ();
var typedPK = publicKey.Serialize ();
var pK = new byte[typedPK.Length - 1];
for (int i = 1; i < typedPK.Length; i++) {
pK [i - 1] = typedPK [i];
}
var shared = Sodium.ScalarMult.Mult (sK, pK);
return shared;
} else {
throw new Exception ("Unknown type");
}
}
