public override void LoadXml(XmlElement value)
{
if (value == null)
{
throw new ArgumentNullException(nameof(value));
}
if (value.Name != KeyValueElementName ||
value.NamespaceURI != XmlNameSpace.Url[NS.XmlDsigNamespaceUrl])
{
throw new System.Security.Cryptography.CryptographicException($"Root element must be {KeyValueElementName} element in namepsace {NS.XmlDsigNamespaceUrl}");
}
const string xmlDsigNamespacePrefix = "dsig";
XmlNamespaceManager xmlNamespaceManager = new XmlNamespaceManager(value.OwnerDocument.NameTable);
xmlNamespaceManager.AddNamespace(xmlDsigNamespacePrefix, XmlNameSpace.Url[NS.XmlDsigNamespaceUrl]);
XmlNode dsaKeyValueElement = value.SelectSingleNode($"{xmlDsigNamespacePrefix}:{DSAKeyValueElementName}", xmlNamespaceManager);
if (dsaKeyValueElement == null)
{
throw new System.Security.Cryptography.CryptographicException($"{KeyValueElementName} must contain child element {DSAKeyValueElementName}");
}
XmlNode yNode = dsaKeyValueElement.SelectSingleNode($"{xmlDsigNamespacePrefix}:{YElementName}", xmlNamespaceManager);
if (yNode == null)
{
throw new System.Security.Cryptography.CryptographicException($"{YElementName} is missing");
}
XmlNode pNode = dsaKeyValueElement.SelectSingleNode($"{xmlDsigNamespacePrefix}:{PElementName}", xmlNamespaceManager);
XmlNode qNode = dsaKeyValueElement.SelectSingleNode($"{xmlDsigNamespacePrefix}:{QElementName}", xmlNamespaceManager);
if ((pNode == null && qNode != null) || (pNode != null && qNode == null))
{
throw new System.Security.Cryptography.CryptographicException($"{PElementName} and {QElementName} can only occour in combination");
}
XmlNode gNode = dsaKeyValueElement.SelectSingleNode($"{xmlDsigNamespacePrefix}:{GElementName}", xmlNamespaceManager);
_ = dsaKeyValueElement.SelectSingleNode($"{xmlDsigNamespacePrefix}:{JElementName}", xmlNamespaceManager);
XmlNode seedNode = dsaKeyValueElement.SelectSingleNode($"{xmlDsigNamespacePrefix}:{SeedElementName}", xmlNamespaceManager);
XmlNode pgenCounterNode = dsaKeyValueElement.SelectSingleNode($"{xmlDsigNamespacePrefix}:{PgenCounterElementName}", xmlNamespaceManager);
if ((seedNode == null && pgenCounterNode != null) || (seedNode != null && pgenCounterNode == null))
{
throw new System.Security.Cryptography.CryptographicException($"{SeedElementName} and {PgenCounterElementName} can only occur in combination");
}
try
{
_key = new DsaPublicKeyParameters(new Math.BigInteger(1, Convert.FromBase64String(yNode.InnerText)),
new DsaParameters(
new Math.BigInteger(1, (pNode != null) ? Convert.FromBase64String(pNode.InnerText) : null),
new Math.BigInteger(1, (qNode != null) ? Convert.FromBase64String(qNode.InnerText) : null),
new Math.BigInteger(1, (gNode != null) ? Convert.FromBase64String(gNode.InnerText) : null),
new DsaValidationParameters(
(seedNode != null) ? Convert.FromBase64String(seedNode.InnerText) : null,
(pgenCounterNode != null) ? EncodingUtils.ConvertByteArrayToInt(Convert.FromBase64String(pgenCounterNode.InnerText)) : 0)));
}
catch (Exception ex)
{
throw new System.Security.Cryptography.CryptographicException($"An error occurred parsing the key components", ex);
}
}
