// TODO add exceptions for operations with missing keys
public Curve25519KeyPair()
{
byte[] privateKey;
byte[] edPublicKey;
byte[] xPrivateKey;
byte[] xPublicKey;
// Generates keys until the conversion algorithm works for that key (there is probably a <1/100000 chance of this, but hey)
while (true)
{
privateKey = new byte[Ed25519PrivateKeyParameters.KeySize];
Ed25519.GeneratePrivateKey(new SecureRandom(), privateKey);
edPublicKey = new byte[Ed25519PublicKeyParameters.KeySize];
Ed25519.GeneratePublicKey(privateKey, 0, edPublicKey, 0);
xPrivateKey = ConvertEdPrivateKeyToMontgomery(privateKey);
xPublicKey = new byte[X25519PublicKeyParameters.KeySize];
X25519.GeneratePublicKey(xPrivateKey, 0, xPublicKey, 0);
if (xPublicKey.SequenceEqual(ConvertEdPublicKeyToMontgomery(edPublicKey)))
{
break;
}
}
_edPrivateKey = privateKey;
_XprivateKey = xPrivateKey;
_edPublicKey = edPublicKey;
_XpublicKey = xPublicKey;
}
public X25519PublicKeyParameters GeneratePublicKey()
{
byte[] publicKey = new byte[X25519.PointSize];
X25519.GeneratePublicKey(data, 0, publicKey, 0);
return(new X25519PublicKeyParameters(publicKey, 0));
}
public Curve25519KeyPair(byte[] key, bool isPrivate, bool isEd25519)
{
// both can only be recovered if the input is an edwards key
if (isEd25519)
{
if (isPrivate)
{
_edPrivateKey = key;
byte[] xPrivateKey = ConvertEdPrivateKeyToMontgomery(key);
byte[] edPublicKey = new byte[Ed25519PublicKeyParameters.KeySize];
Ed25519.GeneratePublicKey(key, 0, edPublicKey, 0);
byte[] xPublicKey = new byte[X25519PublicKeyParameters.KeySize];
X25519.GeneratePublicKey(xPrivateKey, 0, xPublicKey, 0);
if (!xPublicKey.SequenceEqual(ConvertEdPublicKeyToMontgomery(edPublicKey)))
{
throw new CryptographicException(
"The supplied Ed25519 private key is invalid for use: please use another.");
}
_XprivateKey = xPrivateKey;
_edPublicKey = edPublicKey;
_XpublicKey = xPublicKey;
}
else
{
_edPublicKey = key;
_edPrivateKey = null;
_XpublicKey = ConvertEdPublicKeyToMontgomery(key);
_XprivateKey = null;
}
}
else
{
if (isPrivate)
{
_XprivateKey = key;
byte[] xPublicKey = new byte[X25519PublicKeyParameters.KeySize];
X25519.GeneratePublicKey(key, 0, xPublicKey, 0);
_XpublicKey = xPublicKey;
_edPublicKey = null;
_edPrivateKey = null;
}
else
{
_XpublicKey = key;
_XprivateKey = null;
_edPublicKey = null;
_edPrivateKey = null;
}
}
}