예제 #1
0
        /// <summary>
        /// Imports the specified <see cref="DHParameters"/>.
        /// </summary>
        /// <param name="parameters">The parameters for <see cref="DiffieHellman"/>.</param>
        /// <exception cref="CryptographicException"><paramref name="P"/> or <paramref name="G"/> is a null reference (<b>Nothing</b> in Visual Basic) -or- <paramref name="P"/> is not a prime number.</exception>
        public override void ImportParameters(DHParameters parameters)
        {
            if (parameters.P == null)
            {
                throw new CryptographicException("Missing P value.");
            }
            if (parameters.G == null)
            {
                throw new CryptographicException("Missing G value.");
            }

            BigInteger p = new BigInteger(parameters.P), g = new BigInteger(parameters.G), x = null;

            if (parameters.X != null)
            {
                x = new BigInteger(parameters.X);
            }
            Initialize(p, g, x, 0, true);
        }
예제 #2
0
        /// <summary>
        /// Reconstructs a <see cref="DiffieHellman"/> object from an XML string.
        /// </summary>
        /// <param name="xmlString">The XML string to use to reconstruct the DiffieHellman object.</param>
        /// <exception cref="CryptographicException">One of the values in the XML string is invalid.</exception>
        public override void FromXmlString(string xmlString)
        {
            if (xmlString == null)
            {
                throw new ArgumentNullException("xmlString");
            }

            DHParameters dhParams = new DHParameters();

            try {
                SecurityParser sp = new SecurityParser();
                sp.LoadXml(xmlString);
                SecurityElement se = sp.ToXml();
                if (se.Tag != "DHKeyValue")
                {
                    throw new CryptographicException();
                }
                dhParams.P = GetNamedParam(se, "P");
                dhParams.G = GetNamedParam(se, "G");
                dhParams.X = GetNamedParam(se, "X");
                ImportParameters(dhParams);
            } finally {
                if (dhParams.P != null)
                {
                    Array.Clear(dhParams.P, 0, dhParams.P.Length);
                }
                if (dhParams.G != null)
                {
                    Array.Clear(dhParams.G, 0, dhParams.G.Length);
                }
                if (dhParams.X != null)
                {
                    Array.Clear(dhParams.X, 0, dhParams.X.Length);
                }
            }
        }
예제 #3
0
 /// <summary>
 /// When overridden in a derived class, imports the specified <see cref="DHParameters"/>.
 /// </summary>
 /// <param name="parameters">The parameters for Diffie-Hellman.</param>
 public abstract void ImportParameters(DHParameters parameters);