public void PublicKeyAuthConvertToCurve25519()
{
var keypairSeed = new byte[] {
0x42, 0x11, 0x51, 0xa4, 0x59, 0xfa, 0xea, 0xde,
0x3d, 0x24, 0x71, 0x15, 0xf9, 0x4a, 0xed, 0xae,
0x42, 0x31, 0x81, 0x24, 0x09, 0x5a, 0xfa, 0xbe,
0x4d, 0x14, 0x51, 0xa5, 0x59, 0xfa, 0xed, 0xee
};
var keys = PublicKeyAuth.GenerateKeyPair(keypairSeed);
var ed25519Pk = keys.PublicKey;
var ed25519SkPk = keys.PrivateKey;
var curve25519Pk = PublicKeyAuth.ConvertEd25519PublicKeyToCurve25519PublicKey(ed25519Pk);
var curve25519Sk = PublicKeyAuth.ConvertEd25519SecretKeyToCurve25519SecretKey(ed25519SkPk);
Assert.AreEqual(Utilities.BinaryToHex(curve25519Pk, Utilities.HexFormat.None, Utilities.HexCase.Upper),
"F1814F0E8FF1043D8A44D25BABFF3CEDCAE6C22C3EDAA48F857AE70DE2BAAE50");
Assert.AreEqual(Utilities.BinaryToHex(curve25519Sk, Utilities.HexFormat.None, Utilities.HexCase.Upper),
"8052030376D47112BE7F73ED7A019293DD12AD910B654455798B4667D73DE166");
for (var i = 0; i < 500; i++)
{
keys = PublicKeyAuth.GenerateKeyPair();
ed25519Pk = keys.PublicKey;
ed25519SkPk = keys.PrivateKey;
curve25519Pk = PublicKeyAuth.ConvertEd25519PublicKeyToCurve25519PublicKey(ed25519Pk);
curve25519Sk = PublicKeyAuth.ConvertEd25519SecretKeyToCurve25519SecretKey(ed25519SkPk);
var curve25519Pk2 = ScalarMult.Base(curve25519Sk);
CollectionAssert.AreEqual(curve25519Pk, curve25519Pk2);
}
}
public void ConvertToCurve25519Test()
{
// Keypair seed from libsodium-net
var keypairSeed = new byte[] {
0x42, 0x11, 0x51, 0xa4, 0x59, 0xfa, 0xea, 0xde,
0x3d, 0x24, 0x71, 0x15, 0xf9, 0x4a, 0xed, 0xae,
0x42, 0x31, 0x81, 0x24, 0x09, 0x5a, 0xfa, 0xbe,
0x4d, 0x14, 0x51, 0xa5, 0x59, 0xfa, 0xed, 0xee
};
var kp = PublicKeyAuth.GenerateKeyPair(keypairSeed);
var ed25519Pk = kp.Public;
var ed25519SkPk = kp.Secret;
var curve25519Pk = PublicKeyAuth.ConvertEd25519PublicKeyToCurve25519PublicKey(ed25519Pk);
var curve25519Sk = PublicKeyAuth.ConvertEd25519SecretKeyToCurve25519SecretKey(ed25519SkPk);
Assert.AreEqual(Convert.ToBase64String(curve25519Pk), "8YFPDo/xBD2KRNJbq/887crmwiw+2qSPhXrnDeK6rlA=");
Assert.AreEqual(Convert.ToBase64String(curve25519Sk), "gFIDA3bUcRK+f3PtegGSk90SrZELZURVeYtGZ9c94WY=");
for (var i = 0; i < 500; i++)
{
kp = PublicKeyAuth.GenerateKeyPair();
ed25519Pk = kp.Public;
ed25519SkPk = kp.Secret;
curve25519Pk = PublicKeyAuth.ConvertEd25519PublicKeyToCurve25519PublicKey(ed25519Pk);
curve25519Sk = PublicKeyAuth.ConvertEd25519SecretKeyToCurve25519SecretKey(ed25519SkPk);
var curve25519Pk2 = ScalarMult.Base(curve25519Sk);
CollectionAssert.AreEqual(curve25519Pk, curve25519Pk2);
}
}
public KeyPair(Sodium.KeyPair a)
{
this.PublicKey = PublicKeyAuth
.ConvertEd25519PublicKeyToCurve25519PublicKey(a.PublicKey);
this.PrivateKey = PublicKeyAuth
.ConvertEd25519SecretKeyToCurve25519SecretKey(a.PrivateKey);
}
private void DeriveSecrets()
{
var curve25519Sk = PublicKeyAuth
.ConvertEd25519SecretKeyToCurve25519SecretKey(
this._longterm_client_keypair.PrivateKey
);
var curve25519Pk = PublicKeyAuth
.ConvertEd25519PublicKeyToCurve25519PublicKey(
_longterm_server_pk
);
this._shared_ab = ScalarMult.Mult(
this._ephemeral_client_keypair.PrivateKey,
this._ephemeral_server_pk
);
this._shared_aB = ScalarMult.Mult(
this._ephemeral_client_keypair.PrivateKey,
curve25519Pk
);
this._shared_Ab = ScalarMult.Mult(
curve25519Sk,
_ephemeral_server_pk
);
}
public static byte[] DecodeMessage(byte[] message, byte[] nonce, byte[] senderPublicKey, byte[] recipientPrivateKey)
{
var curvePublicKey = PublicKeyAuth.ConvertEd25519PublicKeyToCurve25519PublicKey(senderPublicKey);
var curveSecretKey = PublicKeyAuth.ConvertEd25519SecretKeyToCurve25519SecretKey(recipientPrivateKey);
return(TweetNaCl.CryptoBoxOpen(message, nonce, curvePublicKey, curveSecretKey));
}
// Decrypts data with receiver’s private key using Libsodium
public static string DecryptWithPrivateKey(string data, string privateKey)
{
var privateKeyConverted = PublicKeyAuth.ConvertEd25519SecretKeyToCurve25519SecretKey(Hex.Decode(privateKey));
var publicKey = Hex.Decode(GetPublicKeyFromPrivate(privateKey));
var publicKeyConverted = PublicKeyAuth.ConvertEd25519PublicKeyToCurve25519PublicKey(publicKey);
return(Encoding.UTF8.GetString(SealedPublicKeyBox.Open(Hex.Decode(data), privateKeyConverted, publicKeyConverted)));
}
private void DeriveAb()
{
var curve25519Pk = PublicKeyAuth
.ConvertEd25519PublicKeyToCurve25519PublicKey(
this._longterm_client_pk
);
this._shared_Ab = ScalarMult.Mult(
this._ephemeral_server_keypair.PrivateKey,
curve25519Pk
);
}
public void ConvertEd25519PublicKeyToCurve25519PublicKeyBadKey()
{
//Don`t copy keypairSeed for other tests (bad key)!
//30 byte
var keypairSeed = new byte[] {
0x42, 0x11, 0x51, 0xa4, 0x59, 0xfa, 0xea, 0xde,
0x3d, 0x24, 0x71, 0x15, 0xf9, 0x4a, 0xed, 0xae,
0x42, 0x31, 0x81, 0x24, 0x09, 0x5a, 0xfa, 0xbe,
0x4d, 0x14, 0x51, 0xa5, 0x59, 0xfa
};
PublicKeyAuth.ConvertEd25519PublicKeyToCurve25519PublicKey(keypairSeed);
}
// Encrypts data with receiver’s public key using Libsodium
public static string EncryptWithPublicKey(string data, string publicKey)
{
var publicKeyConverted = PublicKeyAuth.ConvertEd25519PublicKeyToCurve25519PublicKey(Hex.Decode(publicKey));
return(Hex.ToHexString(SealedPublicKeyBox.Create(Encoding.UTF8.GetBytes(data), publicKeyConverted)));
}