/// <summary>
/// Derives the keys client for the client.
/// </summary>
/// <returns><c>true</c>, if keys client was derived, <c>false</c> otherwise.</returns>
/// <param name="publicIdentKey">Public identification key.</param>
/// <param name="publicPreKey">Public pre key.</param>
/// <param name="signedOneTimeKey">Public one time key.</param>
public bool DeriveKeysClient(byte[] publicIdentKey, byte[] publicPreKey, byte[] signedOneTimeKey)
{
if (publicIdentKey == null)
{
throw new EncryptionKeyIsMissingException("Public IdentKey is null");
}
if (publicPreKey == null)
{
throw new EncryptionKeyIsMissingException("Public PreKey is null");
}
this.publicIdentKey = publicIdentKey;
this.publicPreKey = publicPreKey;
ephemeralKeyPair = NewKeypair();
// ephermeral And Public Pre Key
KeyPair ePPK = new KeyPair();
// ephermeral and Public One Time Key
KeyPair ePOTK = new KeyPair();
// own Pre Key and Public Pre Key
KeyPair oPKPPK = new KeyPair();
// own Pre Key and Public One Time Key
KeyPair oPKPOTK = new KeyPair();
// TODO: overgive pre key :)
// if (oldKeyPair) {
// if (publicOneTimeKey != null) {
// NativeLibsodium.crypto_kx_client_session_keys (ePOTK.publicKey, ePOTK.privateKey, ephemeralKeyPair.publicKey, ephemeralKeyPair.privateKey, publicOneTimeKey);
// NativeLibsodium.crypto_kx_client_session_keys (oPKPOTK.publicKey, oPKPOTK.privateKey, oldOwnPreKeyPair.publicKey, oldOwnPreKeyPair.privateKey, publicOneTimeKey);
// }
// NativeLibsodium.crypto_kx_client_session_keys (ePPK.publicKey, ePPK.privateKey, ephemeralKeyPair.publicKey, ephemeralKeyPair.privateKey, publicPreKey);
// NativeLibsodium.crypto_kx_client_session_keys (oPKPPK.publicKey, oPKPPK.privateKey, oldOwnPreKeyPair.publicKey, oldOwnPreKeyPair.privateKey, publicPreKey);
// } else {
if (signedOneTimeKey != null)
{
// get the onetime key
publicOneTimeKey = SignByteOpen(signedOneTimeKey, publicPreKey);
NativeLibsodium.crypto_kx_client_session_keys(ePOTK.publicKey, ePOTK.secretKey, ephemeralKeyPair.publicKey, ephemeralKeyPair.secretKey, publicOneTimeKey);
NativeLibsodium.crypto_kx_client_session_keys(oPKPOTK.publicKey, oPKPOTK.secretKey, ownPreKeyPair.publicKey, ownPreKeyPair.secretKey, publicOneTimeKey);
}
NativeLibsodium.crypto_kx_client_session_keys(ePPK.publicKey, ePPK.secretKey, ephemeralKeyPair.publicKey, ephemeralKeyPair.secretKey, publicPreKey);
NativeLibsodium.crypto_kx_client_session_keys(oPKPPK.publicKey, oPKPPK.secretKey, ownPreKeyPair.publicKey, ownPreKeyPair.secretKey, publicPreKey);
DeriveSessionKeys(ePPK, oPKPPK, oPKPOTK, ePOTK);
return(true);
}
public bool DeriveKeysClient(bool oldKeyPair = false)
{
if (publicIdentKey == null || publicPreKey == null)
{
return(false);
//throw new EncryptionKeyIsMissingException();
}
ephemeralKeyPair = NewKeypair();
// ephermeral And Public Pre Key
KeyPair ePPK = new KeyPair();
// ephermeral and Public One Time Key
KeyPair ePOTK = new KeyPair();
// own Pre Key and Public Pre Key
KeyPair oPKPPK = new KeyPair();
// own Pre Key and Public One Time Key
KeyPair oPKPOTK = new KeyPair();
// TODO: overgive pre key :)
// if (oldKeyPair) {
// if (publicOneTimeKey != null) {
// NativeLibsodium.crypto_kx_client_session_keys (ePOTK.publicKey, ePOTK.privateKey, ephemeralKeyPair.publicKey, ephemeralKeyPair.privateKey, publicOneTimeKey);
// NativeLibsodium.crypto_kx_client_session_keys (oPKPOTK.publicKey, oPKPOTK.privateKey, oldOwnPreKeyPair.publicKey, oldOwnPreKeyPair.privateKey, publicOneTimeKey);
// }
// NativeLibsodium.crypto_kx_client_session_keys (ePPK.publicKey, ePPK.privateKey, ephemeralKeyPair.publicKey, ephemeralKeyPair.privateKey, publicPreKey);
// NativeLibsodium.crypto_kx_client_session_keys (oPKPPK.publicKey, oPKPPK.privateKey, oldOwnPreKeyPair.publicKey, oldOwnPreKeyPair.privateKey, publicPreKey);
// } else {
if (publicOneTimeKey != null)
{
NativeLibsodium.crypto_kx_client_session_keys(ePOTK.publicKey, ePOTK.secretKey, ephemeralKeyPair.publicKey, ephemeralKeyPair.secretKey, publicOneTimeKey);
NativeLibsodium.crypto_kx_client_session_keys(oPKPOTK.publicKey, oPKPOTK.secretKey, ownPreKeyPair.publicKey, ownPreKeyPair.secretKey, publicOneTimeKey);
}
NativeLibsodium.crypto_kx_client_session_keys(ePPK.publicKey, ePPK.secretKey, ephemeralKeyPair.publicKey, ephemeralKeyPair.secretKey, publicPreKey);
NativeLibsodium.crypto_kx_client_session_keys(oPKPPK.publicKey, oPKPPK.secretKey, ownPreKeyPair.publicKey, ownPreKeyPair.secretKey, publicPreKey);
DeriveSessionKeys(ePPK, oPKPPK, oPKPOTK, ePOTK);
return(true);
}
public void ComputeKeysClient()
{
NativeLibsodium.crypto_kx_client_session_keys(sessionReceiveKey, sessionSendKey, ownIdentKeyPair.publicKey, ownIdentKeyPair.secretKey, publicIdentKey);
}
public override void DeriveClientSessionKeys(byte[] data, KeyPair ownKeyPair)
{
NativeLibsodium.crypto_kx_client_session_keys(sessionReceiveKey, sessionSendKey, ownKeyPair.publicKey, ownKeyPair.secretKey, data);
}