public override void FromXmlString(string xmlString)
{
// ParseDocument does the nullcheck for us.
XmlKeyHelper.ParseState state = XmlKeyHelper.ParseDocument(xmlString);
byte[] n = ReadRequiredElement(ref state, nameof(RSAParameters.Modulus));
byte[] e = ReadRequiredElement(ref state, nameof(RSAParameters.Exponent));
int halfN = (n.Length + 1) / 2;
// .NET Framework doesn't report any element other than Modulus/Exponent as required,
// it just lets import fail if they're imbalanced.
byte[]? p = XmlKeyHelper.ReadCryptoBinary(ref state, nameof(RSAParameters.P), halfN);
byte[]? q = XmlKeyHelper.ReadCryptoBinary(ref state, nameof(RSAParameters.Q), halfN);
byte[]? dp = XmlKeyHelper.ReadCryptoBinary(ref state, nameof(RSAParameters.DP), halfN);
byte[]? dq = XmlKeyHelper.ReadCryptoBinary(ref state, nameof(RSAParameters.DQ), halfN);
byte[]? qInv = XmlKeyHelper.ReadCryptoBinary(ref state, nameof(RSAParameters.InverseQ), halfN);
byte[]? d = XmlKeyHelper.ReadCryptoBinary(ref state, nameof(RSAParameters.D), n.Length);
RSAParameters keyParameters = new RSAParameters
{
Modulus = n,
Exponent = e,
D = d,
P = p,
Q = q,
DP = dp,
DQ = dq,
InverseQ = qInv,
};
ImportParameters(keyParameters);
}
public override void FromXmlString(string xmlString)
{
// ParseDocument does the nullcheck for us.
XmlKeyHelper.ParseState state = XmlKeyHelper.ParseDocument(xmlString);
byte[] p = ReadRequiredElement(ref state, nameof(DSAParameters.P));
byte[] q = ReadRequiredElement(ref state, nameof(DSAParameters.Q));
byte[] g = ReadRequiredElement(ref state, nameof(DSAParameters.G), p.Length);
byte[] y = ReadRequiredElement(ref state, nameof(DSAParameters.Y), p.Length);
byte[] j = XmlKeyHelper.ReadCryptoBinary(ref state, nameof(DSAParameters.J));
byte[] seed = XmlKeyHelper.ReadCryptoBinary(ref state, nameof(DSAParameters.Seed));
int counter = 0;
byte[] x = XmlKeyHelper.ReadCryptoBinary(ref state, nameof(DSAParameters.X), q.Length);
if (seed != null)
{
byte[] counterBytes = ReadRequiredElement(ref state, CounterElementName);
counter = XmlKeyHelper.ReadCryptoBinaryInt32(counterBytes);
}
DSAParameters dsaParameters = new DSAParameters
{
P = p,
Q = q,
G = g,
Y = y,
J = j,
Seed = seed,
Counter = counter,
X = x,
};
// Check for Counter without Seed after getting X, since that prevents an extra cycle in the
// canonical element order.
if (dsaParameters.Seed == null)
{
if (XmlKeyHelper.HasElement(ref state, CounterElementName))
{
throw new CryptographicException(
SR.Format(
SR.Cryptography_InvalidFromXmlString,
nameof(DSA),
nameof(DSAParameters.Seed)));
}
}
ImportParameters(dsaParameters);
}
private static byte[] ReadRequiredElement(
ref XmlKeyHelper.ParseState state,
string name,
int sizeHint = -1)
{
byte[] ret = XmlKeyHelper.ReadCryptoBinary(ref state, name, sizeHint);
if (ret == null)
{
throw new CryptographicException(
SR.Format(SR.Cryptography_InvalidFromXmlString, nameof(DSA), name));
}
return(ret);
}
