public static void ItDecryptsLicense()
{
using (var key = RSA.Create())
{
string expected;
string encryptedLicenseWithGrants = GenerateLicenseXmlWithEncryptedGrants(key, out expected);
Assert.Contains("hello", expected);
Assert.DoesNotContain("hello", encryptedLicenseWithGrants);
XmlNamespaceManager nsManager;
XmlDocument toDecrypt = LoadXmlWithLicenseNs(encryptedLicenseWithGrants, out nsManager);
var decryptor = new XmlLicenseEncryptedRef();
var transform = new XmlLicenseTransform()
{
Decryptor = decryptor,
Context = FindLicenseTransformContext(toDecrypt, nsManager)
};
decryptor.AddAsymmetricKey(key);
// Context is the input for this transform, argument is always ignored
transform.LoadInput(null);
XmlDocument decryptedDoc = transform.GetOutput() as XmlDocument;
Assert.NotNull(decryptedDoc);
string decrypted = decryptedDoc.OuterXml;
Assert.Equal(expected, decrypted);
}
}
private static void EncryptGrant(XmlNode grant, RSA key, XmlNamespaceManager nsMgr)
{
using (var ms = new MemoryStream())
using (var sw = new StreamWriter(ms))
{
sw.Write(grant.InnerXml);
sw.Flush();
ms.Position = 0;
KeyInfo keyInfo;
EncryptionMethod encryptionMethod;
CipherData cipherData;
XmlLicenseEncryptedRef.Encrypt(ms, key, out keyInfo, out encryptionMethod, out cipherData);
grant.RemoveAll();
XmlDocument doc = grant.OwnerDocument;
XmlElement encryptedGrant = doc.CreateElement("encryptedGrant", LicenseTransformNsUrl);
grant.AppendChild(encryptedGrant);
encryptedGrant.AppendChild(doc.ImportNode(keyInfo.GetXml(), true));
encryptedGrant.AppendChild(doc.ImportNode(encryptionMethod.GetXml(), true));
encryptedGrant.AppendChild(doc.ImportNode(cipherData.GetXml(), true));
}
}
public static void ItRoundTrips()
{
byte[] input = new byte[] { 1, 2, 7, 4 };
MemoryStream ms = new MemoryStream(input);
KeyInfo keyInfo;
EncryptionMethod encMethod;
CipherData cipherData;
using (RSA rsa = RSA.Create())
{
Encrypt(ms, rsa, out keyInfo, out encMethod, out cipherData);
XmlLicenseEncryptedRef decr = new XmlLicenseEncryptedRef();
decr.AddAsymmetricKey(rsa);
using (var encrypted = new MemoryStream(cipherData.CipherValue))
using (Stream decrypted = decr.Decrypt(encMethod, keyInfo, encrypted))
{
byte[] decryptedBytes = new byte[decrypted.Length];
decrypted.Read(decryptedBytes, 0, (int)decrypted.Length);
Assert.Equal(input, decryptedBytes);
}
}
}
