Esempio n. 1
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        /// <summary>
        /// Generates a full key pair (Public and private) given the private key
        /// </summary>
        /// <param name="privateKey">The private key to generate public key from</param>
        /// <returns>A full key pair</returns>
        public static X25519KeyPair GenerateKeyFromPrivateKey(byte[] privateKey)
        {
            X25519KeyPair key = new X25519KeyPair
            {
                PrivateKey = privateKey
            };

            key.PublicKey = Curve25519.ScalarMultiplication(key.PrivateKey, Curve25519.Basepoint);
            return(key);
        }
Esempio n. 2
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        /// <summary>
        /// Uses RNG Random to generate a key pair
        /// </summary>
        /// <returns>A random key pair</returns>
        public static X25519KeyPair GenerateKeyPair()
        {
            // at first generate the private key
            X25519KeyPair key = new X25519KeyPair
            {
                PrivateKey = new byte[32]
            };

            using (var rnd = new RNGCryptoServiceProvider())
                rnd.GetBytes(key.PrivateKey);
            // as defined in https://cr.yp.to/ecdh.html do these operation to finalize the private key
            key.PrivateKey[0]  &= 248;
            key.PrivateKey[31] &= 127;
            key.PrivateKey[31] |= 64;
            // compute the public key
            key.PublicKey = Curve25519.ScalarMultiplication(key.PrivateKey, Curve25519.Basepoint);
            return(key);
        }
Esempio n. 3
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 /// <summary>
 /// Generate a shared secret with the other users public key and your private key
 /// </summary>
 /// <param name="myPrivateKey">Your private key</param>
 /// <param name="otherPublicKey">The public key of the other user</param>
 /// <returns>A shared secret</returns>
 public static byte[] Agreement(byte[] myPrivateKey, byte[] otherPublicKey)
 {
     return(Curve25519.ScalarMultiplication(myPrivateKey, otherPublicKey));
 }