/// <summary>
/// Reads XML conforming to https://www.w3.org/TR/2001/PR-xmldsig-core-20010820/#sec-KeyInfo
/// </summary>
/// <param name="reader"><see cref="XmlReader"/> pointing positioned on a <KeyInfo> element.</param>
/// <exception cref="ArgumentNullException">if <paramref name="reader"/> is null.</exception>
/// <exception cref="XmlReadException">if there is a problem reading the XML.</exception>
/// <remarks>Only handles IssuerSerial, Ski, SubjectName, Certificate. Unsupported types are skipped. Only a X509 data element is supported.</remarks>
public virtual KeyInfo ReadKeyInfo(XmlReader reader)
{
XmlUtil.CheckReaderOnEntry(reader, XmlSignatureConstants.Elements.KeyInfo, XmlSignatureConstants.Namespace);
var keyInfo = new KeyInfo
{
Prefix = reader.Prefix
};
try
{
bool isEmptyElement = reader.IsEmptyElement;
// <KeyInfo>
reader.ReadStartElement();
while (reader.IsStartElement())
{
// <X509Data>
if (reader.IsStartElement(XmlSignatureConstants.Elements.X509Data, XmlSignatureConstants.Namespace))
{
keyInfo.X509Data.Add(ReadX509Data(reader));
}
// <RetrievalMethod>
else if (reader.IsStartElement(XmlSignatureConstants.Elements.RetrievalMethod, XmlSignatureConstants.Namespace))
{
keyInfo.RetrievalMethodUri = reader.GetAttribute(XmlSignatureConstants.Attributes.URI);
reader.ReadOuterXml();
}
// <KeyName>
else if (reader.IsStartElement(XmlSignatureConstants.Elements.KeyName, XmlSignatureConstants.Namespace))
{
keyInfo.KeyName = reader.ReadElementContentAsString(XmlSignatureConstants.Elements.KeyName, XmlSignatureConstants.Namespace);
}
// <KeyValue>
else if (reader.IsStartElement(XmlSignatureConstants.Elements.KeyValue, XmlSignatureConstants.Namespace))
{
reader.ReadStartElement(XmlSignatureConstants.Elements.KeyValue, XmlSignatureConstants.Namespace);
if (reader.IsStartElement(XmlSignatureConstants.Elements.RSAKeyValue, XmlSignatureConstants.Namespace))
{
// Multiple RSAKeyValues were found
if (keyInfo.RSAKeyValue != null)
{
throw XmlUtil.LogReadException(LogMessages.IDX30015, XmlSignatureConstants.Elements.RSAKeyValue);
}
keyInfo.RSAKeyValue = ReadRSAKeyValue(reader);
}
else
{
// Skip the element since it is not an <RSAKeyValue>
LogHelper.LogWarning(LogMessages.IDX30300, reader.ReadOuterXml());
}
// </KeyValue>
reader.ReadEndElement();
}
else
{
// Skip the element since it is not one of <RetrievalMethod>, <X509Data>, <KeyValue>
LogHelper.LogWarning(LogMessages.IDX30300, reader.ReadOuterXml());
}
}
// </KeyInfo>
if (!isEmptyElement)
{
reader.ReadEndElement();
}
}
catch (Exception ex)
{
if (ex is XmlReadException)
{
throw;
}
throw XmlUtil.LogReadException(LogMessages.IDX30017, ex, XmlSignatureConstants.Elements.KeyInfo, ex);
}
return(keyInfo);
}
/// <summary>
/// Writes the contents of a <see cref="KeyInfo"/> as XML conforming to https://www.w3.org/TR/2001/PR-xmldsig-core-20010820/#sec-KeyInfo.
/// </summary>
/// <param name="writer">the <see cref="XmlWriter"/> to use.</param>
/// <param name="keyInfo">the <see cref="KeyInfo"/>to write.</param>
/// <exception cref="ArgumentNullException">if <paramref name="writer"/> is null.</exception>
/// <exception cref="ArgumentNullException">if <paramref name="keyInfo"/> is null.</exception>
/// <exception cref="XmlWriteException">if there is a problem writing the XML.</exception>
public virtual void WriteKeyInfo(XmlWriter writer, KeyInfo keyInfo)
{
if (writer == null)
{
throw LogArgumentNullException(nameof(writer));
}
if (keyInfo == null)
{
throw LogArgumentNullException(nameof(keyInfo));
}
// <KeyInfo>
writer.WriteStartElement(XmlSignatureConstants.Elements.KeyInfo, XmlSignatureConstants.Namespace);
if (keyInfo.KeyName != null)
{
writer.WriteElementString(Prefix, XmlSignatureConstants.Elements.KeyName, XmlSignatureConstants.Namespace, keyInfo.KeyName);
}
if (keyInfo.RSAKeyValue != null)
{
// <KeyValue>
writer.WriteStartElement(Prefix, XmlSignatureConstants.Elements.KeyValue, XmlSignatureConstants.Namespace);
// <RSAKeyValue>
writer.WriteStartElement(Prefix, XmlSignatureConstants.Elements.RSAKeyValue, XmlSignatureConstants.Namespace);
// <Modulus>...</Modulus>
writer.WriteElementString(Prefix, XmlSignatureConstants.Elements.Modulus, XmlSignatureConstants.Namespace, keyInfo.RSAKeyValue.Modulus);
// <Exponent>...</Exponent>
writer.WriteElementString(Prefix, XmlSignatureConstants.Elements.Exponent, XmlSignatureConstants.Namespace, keyInfo.RSAKeyValue.Exponent);
// </RSAKeyValue>
writer.WriteEndElement();
// </KeyValue>
writer.WriteEndElement();
}
if (keyInfo.RetrievalMethodUri != null)
{
writer.WriteStartElement(keyInfo.Prefix, XmlSignatureConstants.Elements.RetrievalMethod, XmlSignatureConstants.Namespace);
writer.WriteAttributeString(XmlSignatureConstants.Attributes.URI, null, keyInfo.RetrievalMethodUri);
writer.WriteEndElement();
}
foreach (var data in keyInfo.X509Data)
{
// <X509Data>
writer.WriteStartElement(keyInfo.Prefix, XmlSignatureConstants.Elements.X509Data, XmlSignatureConstants.Namespace);
if (data.IssuerSerial != null)
{
writer.WriteStartElement(keyInfo.Prefix, XmlSignatureConstants.Elements.X509IssuerSerial, XmlSignatureConstants.Namespace);
writer.WriteElementString(keyInfo.Prefix, XmlSignatureConstants.Elements.X509IssuerName, XmlSignatureConstants.Namespace, data.IssuerSerial.IssuerName);
writer.WriteElementString(keyInfo.Prefix, XmlSignatureConstants.Elements.X509SerialNumber, XmlSignatureConstants.Namespace, data.IssuerSerial.SerialNumber);
writer.WriteEndElement();
}
if (data.SKI != null)
{
writer.WriteElementString(keyInfo.Prefix, XmlSignatureConstants.Elements.X509SKI, XmlSignatureConstants.Namespace, data.SKI);
}
if (data.SubjectName != null)
{
writer.WriteElementString(keyInfo.Prefix, XmlSignatureConstants.Elements.X509SubjectName, XmlSignatureConstants.Namespace, data.SubjectName);
}
foreach (var certificate in data.Certificates)
{
// <X509Certificate>...</X509Certificate>
writer.WriteElementString(keyInfo.Prefix, XmlSignatureConstants.Elements.X509Certificate, XmlSignatureConstants.Namespace, certificate);
}
if (data.CRL != null)
{
writer.WriteElementString(keyInfo.Prefix, XmlSignatureConstants.Elements.X509CRL, XmlSignatureConstants.Namespace, data.CRL);
}
// </X509Data>
writer.WriteEndElement();
}
// </KeyInfo>
writer.WriteEndElement();
}
