/// <summary>
/// Derives session keys from four key pairs and stores them in intern variables.
/// </summary>
/// <returns>Void.</returns>
/// <param name="ePPK">E PP.</param>
/// <param name="ePK">E P.</param>
/// <param name="iPK">I P.</param>
/// <param name="ePOTK">E POT.</param>
private void DeriveSessionKeys(KeyPair ePPK, KeyPair ePK, KeyPair iPK, KeyPair ePOTK)
{
sessionReceiveKey.key = LibsodiumEncryption.Hash(IEncryption.ConcatBytes(ePPK.secretKey, ePK.secretKey, iPK.secretKey, ePOTK.secretKey));
sessionSendKey.key = LibsodiumEncryption.Hash(IEncryption.ConcatBytes(ePPK.publicKey, ePK.publicKey, iPK.publicKey, ePOTK.publicKey));
/*
* NotificationHandler.Instance.ShowNotification("",
* "sessionReceiveKey is : " + Convert.ToBase64String(sessionReceiveKey) +
* " sessionSendKey is : " + Convert.ToBase64String(sessionSendKey) +
* " ePPK s is : " + Convert.ToBase64String(ePPK.secretKey) +
* " ePK s is : " + Convert.ToBase64String(ePK.secretKey) +
* " iPK s is : " + Convert.ToBase64String(iPK.secretKey) +
* " ePOTK s is : " + Convert.ToBase64String(ePOTK.secretKey) +
* " ePPK is : " + Convert.ToBase64String(ePPK.publicKey) +
* " ePK is : " + Convert.ToBase64String(ePK.publicKey) +
* " iPK is : " + Convert.ToBase64String(iPK.publicKey) +
* " ePOTK is : " + Convert.ToBase64String(ePOTK.publicKey));*/
}
/// <summary>
/// Advances the key.
/// </summary>
/// <returns>The key.</returns>
/// <param name="key">Key.</param>
public static byte[] AdvanceKey(byte[] key)
{
return(LibsodiumEncryption.Hash(IEncryption.ConcatBytes(key, new byte[] { 0x02 })));
}
/// <summary>
/// Gets the enc key from the chainkey.
/// Does this by appending 0x01 to and hashing the current key
/// </summary>
/// <returns>The enc key from chain.</returns>
/// <param name="chainKey">Chain key.</param>
public static byte[] GetEncKeyFromChain(ChainKey chainKey)
{
return(LibsodiumEncryption.Hash(IEncryption.ConcatBytes(chainKey.key, new byte[] { 0x01 })));
}
/// <summary>
/// Converts a chain key to an Encryption key for actual usage
/// </summary>
/// <returns>The encryption key.</returns>
/// <param name="chainKey">Chain key.</param>
private byte[] ChainToEncryptionKey(byte[] chainKey)
{
return(LibsodiumEncryption.Hash(IEncryption.ConcatBytes(chainKey, new byte[] { 0x01 })));
}
/// <summary>
/// Validates a signature for given data
/// </summary>
/// <returns><c>true</c>, if vertify was successful, <c>false</c> otherwise.</returns>
/// <param name="signature">Signature.</param>
/// <param name="data">Data.</param>
/// <param name="publicKey">Public key.</param>
public override bool VertifySignatureDetached(byte[] signature, byte[] data, byte[] publicKey)
{
// skip the first byte at is only the indicator to the signature type
return(LibsodiumEncryption.SignVertifyDetached(signature.Skip(1).ToArray(), data, publicKey));
}
static LibsodiumEncryption()
{
Instance = new LibsodiumEncryption();
}
/// <summary>
/// Derives the encryption key from a passphrase.
/// </summary>
/// <param name="phrase">Phrase.</param>
public void DeriveEncryptionKeyFromPassphrase(string phrase)
{
SetEncryptionKey(LibsodiumEncryption.Hash(System.Text.Encoding.UTF8.GetBytes(phrase)));
}
