// We can provide a default implementation of FromXmlString because we require
// every DSA implementation to implement ImportParameters
// All we have to do here is parse the XML.
/// <include file='doc\dsa.uex' path='docs/doc[@for="DSA.FromXmlString"]/*' />
public override void FromXmlString(String xmlString)
{
if (xmlString == null)
{
throw new ArgumentNullException("xmlString");
}
DSAParameters dsaParams = new DSAParameters();
Parser p = new Parser(xmlString);
SecurityElement topElement = p.GetTopElement();
// P is always present
String pString = topElement.SearchForTextOfLocalName("P");
if (pString == null)
{
throw new CryptographicException(String.Format(Environment.GetResourceString("Cryptography_InvalidFromXmlString"), "DSA", "P"));
}
dsaParams.P = Convert.FromBase64String(AsymmetricAlgorithm.DiscardWhiteSpaces(pString));
// Q is always present
String qString = topElement.SearchForTextOfLocalName("Q");
if (qString == null)
{
throw new CryptographicException(String.Format(Environment.GetResourceString("Cryptography_InvalidFromXmlString"), "DSA", "Q"));
}
dsaParams.Q = Convert.FromBase64String(AsymmetricAlgorithm.DiscardWhiteSpaces(qString));
// G is always present
String gString = topElement.SearchForTextOfLocalName("G");
if (gString == null)
{
throw new CryptographicException(String.Format(Environment.GetResourceString("Cryptography_InvalidFromXmlString"), "DSA", "G"));
}
dsaParams.G = Convert.FromBase64String(AsymmetricAlgorithm.DiscardWhiteSpaces(gString));
// Y is always present
String yString = topElement.SearchForTextOfLocalName("Y");
if (yString == null)
{
throw new CryptographicException(String.Format(Environment.GetResourceString("Cryptography_InvalidFromXmlString"), "DSA", "Y"));
}
dsaParams.Y = Convert.FromBase64String(AsymmetricAlgorithm.DiscardWhiteSpaces(yString));
// J is optional
String jString = topElement.SearchForTextOfLocalName("J");
if (jString != null)
{
dsaParams.J = Convert.FromBase64String(AsymmetricAlgorithm.DiscardWhiteSpaces(jString));
}
// X is optional -- private key if present
String xString = topElement.SearchForTextOfLocalName("X");
if (xString != null)
{
dsaParams.X = Convert.FromBase64String(AsymmetricAlgorithm.DiscardWhiteSpaces(xString));
}
// Seed and PgenCounter are optional as a unit -- both present or both absent
String seedString = topElement.SearchForTextOfLocalName("Seed");
String pgenCounterString = topElement.SearchForTextOfLocalName("PgenCounter");
if ((seedString != null) && (pgenCounterString != null))
{
dsaParams.Seed = Convert.FromBase64String(AsymmetricAlgorithm.DiscardWhiteSpaces(seedString));
dsaParams.Counter = ConvertByteArrayToInt(Convert.FromBase64String(AsymmetricAlgorithm.DiscardWhiteSpaces(pgenCounterString)));
}
else if ((seedString != null) || (pgenCounterString != null))
{
if (seedString == null)
{
throw new CryptographicException(String.Format(Environment.GetResourceString("Cryptography_InvalidFromXmlString"), "DSA", "Seed"));
}
else
{
throw new CryptographicException(String.Format(Environment.GetResourceString("Cryptography_InvalidFromXmlString"), "DSA", "PgenCounter"));
}
}
ImportParameters(dsaParams);
}
/* Import/export functions */
// We can provide a default implementation of FromXmlString because we require
// every RSA implementation to implement ImportParameters
// All we have to do here is parse the XML.
public override void FromXmlString(String xmlString)
{
if (xmlString == null)
{
throw new ArgumentNullException("xmlString");
}
RSAParameters rsaParams = new RSAParameters();
Parser p = new Parser(xmlString);
SecurityElement topElement = p.GetTopElement();
// Modulus is always present
String modulusString = topElement.SearchForTextOfLocalName("Modulus");
if (modulusString == null)
{
throw new CryptographicException(String.Format(Environment.GetResourceString("Cryptography_InvalidFromXmlString"), "RSA", "Modulus"));
}
rsaParams.Modulus = Convert.FromBase64String(AsymmetricAlgorithm.DiscardWhiteSpaces(modulusString));
// Exponent is always present
String exponentString = topElement.SearchForTextOfLocalName("Exponent");
if (exponentString == null)
{
throw new CryptographicException(String.Format(Environment.GetResourceString("Cryptography_InvalidFromXmlString"), "RSA", "Exponent"));
}
rsaParams.Exponent = Convert.FromBase64String(AsymmetricAlgorithm.DiscardWhiteSpaces(exponentString));
// P is optional
String pString = topElement.SearchForTextOfLocalName("P");
if (pString != null)
{
rsaParams.P = Convert.FromBase64String(AsymmetricAlgorithm.DiscardWhiteSpaces(pString));
}
// Q is optional
String qString = topElement.SearchForTextOfLocalName("Q");
if (qString != null)
{
rsaParams.Q = Convert.FromBase64String(AsymmetricAlgorithm.DiscardWhiteSpaces(qString));
}
// DP is optional
String dpString = topElement.SearchForTextOfLocalName("DP");
if (dpString != null)
{
rsaParams.DP = Convert.FromBase64String(AsymmetricAlgorithm.DiscardWhiteSpaces(dpString));
}
// DQ is optional
String dqString = topElement.SearchForTextOfLocalName("DQ");
if (dqString != null)
{
rsaParams.DQ = Convert.FromBase64String(AsymmetricAlgorithm.DiscardWhiteSpaces(dqString));
}
// InverseQ is optional
String inverseQString = topElement.SearchForTextOfLocalName("InverseQ");
if (inverseQString != null)
{
rsaParams.InverseQ = Convert.FromBase64String(AsymmetricAlgorithm.DiscardWhiteSpaces(inverseQString));
}
// D is optional
String dString = topElement.SearchForTextOfLocalName("D");
if (dString != null)
{
rsaParams.D = Convert.FromBase64String(AsymmetricAlgorithm.DiscardWhiteSpaces(dString));
}
ImportParameters(rsaParams);
}
