/// <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();
var dhParams = new DHParameters();
try
{
var 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);
}
}
/// <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);
}
/// <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();
}
var dhParams = new DHParameters();
try
{
var 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);
}
}
}
/// <summary>
/// Creates and returns an XML string representation of the current <see cref="DiffieHellman" /> object.
/// </summary>
/// <param name="includePrivateParameters"><b>true</b> to include private parameters; otherwise, <b>false</b>.</param>
/// <returns>An XML string encoding of the current DiffieHellman object.</returns>
public override string ToXmlString(bool includePrivateParameters)
{
var sb = new StringBuilder();
DHParameters dhParams = ExportParameters(includePrivateParameters);
try
{
sb.Append("<DHKeyValue>");
sb.Append("<P>");
sb.Append(Convert.ToBase64String(dhParams.P));
sb.Append("</P>");
sb.Append("<G>");
sb.Append(Convert.ToBase64String(dhParams.G));
sb.Append("</G>");
if (includePrivateParameters)
{
sb.Append("<X>");
sb.Append(Convert.ToBase64String(dhParams.X));
sb.Append("</X>");
}
sb.Append("</DHKeyValue>");
}
finally
{
Array.Clear(dhParams.P, 0, dhParams.P.Length);
Array.Clear(dhParams.G, 0, dhParams.G.Length);
if (dhParams.X != null)
{
Array.Clear(dhParams.X, 0, dhParams.X.Length);
}
}
return(sb.ToString());
}
/// <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);
/// <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);
/// <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);
}
/// <summary>
/// Exports the <see cref="DHParameters" />.
/// </summary>
/// <param name="includePrivateParameters"><b>true</b> to include private parameters; otherwise, <b>false</b>.</param>
/// <returns>The parameters for <see cref="DiffieHellman" />.</returns>
public override DHParameters ExportParameters(bool includePrivateParameters)
{
var ret = new DHParameters();
ret.P = m_P.GetBytes();
ret.G = m_G.GetBytes();
if (includePrivateParameters)
{
ret.X = m_X.GetBytes();
}
return ret;
}
