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   1 // Licensed to the .NET Foundation under one or more agreements.
   2 // The .NET Foundation licenses this file to you under the MIT license.
   3 // See the LICENSE file in the project root for more information.
   4
   5 using System;
   6 using System.Collections.Generic;
   7 using System.Linq;
   8 using System.Text;
   9 using System.Threading.Tasks;
  10 using System.Xml;
  11 using Xunit;
  12
  13 namespace System.Security.Cryptography.Xml.Tests
  14 {
  15     // Based on implementation of MSDN samples:
  16     // Signing: https://msdn.microsoft.com/en-us/library/ms229745(v=vs.110).aspx
  17     // Verifying: https://msdn.microsoft.com/en-us/library/ms229745(v=vs.110).aspx
  18     public class SigningAndVerifyingWithCustomSignatureMethod
  19     {
  20         const string ExampleXml = @"<?xml version=""1.0""?>
  21 <example>
  22 <test>some text node</test>
  23 </example>";
  24
  25         private static bool SupportsSha2Algorithms =>
  26             !PlatformDetection.IsFullFramework ||
  27             CryptoConfig.CreateFromName("http://www.w3.org/2001/04/xmldsig-more#rsa-sha384") as SignatureDescription != null;
  28
  29         private static void SignXml(XmlDocument doc, RSA key, string signatureMethod, string digestMethod)
  30         {
  31             var signedXml = new SignedXml(doc)
  32             {
  33                 SigningKey = key
  34             };
  35
  36             signedXml.SignedInfo.SignatureMethod = signatureMethod;
  37
  38             var reference = new Reference();
  39             reference.Uri = "";
  40
  41             reference.AddTransform(new XmlDsigEnvelopedSignatureTransform());
  42             reference.DigestMethod = digestMethod;
  43
  44             signedXml.AddReference(reference);
  45
  46             signedXml.ComputeSignature();
  47             XmlElement xmlDigitalSignature = signedXml.GetXml();
  48             doc.DocumentElement.AppendChild(doc.ImportNode(xmlDigitalSignature, true));
  49         }
  50
  51         private static bool VerifyXml(string signedXmlText, RSA key)
  52         {
  53             XmlDocument xmlDoc = new XmlDocument();
  54             xmlDoc.PreserveWhitespace = true;
  55             xmlDoc.LoadXml(signedXmlText);
  56
  57             SignedXml signedXml = new SignedXml(xmlDoc);
  58             var signatureNode = (XmlElement)xmlDoc.GetElementsByTagName("Signature")[0];
  59             signedXml.LoadXml(signatureNode);
  60             return signedXml.CheckSignature(key);
  61         }
  62
  63         // https://github.com/dotnet/corefx/issues/19269
  64         [ConditionalTheory(nameof(SupportsSha2Algorithms))]
  65         [InlineData("http://www.w3.org/2001/04/xmldsig-more#rsa-sha256", "http://www.w3.org/2001/04/xmlenc#sha256")]
  66         [InlineData("http://www.w3.org/2001/04/xmldsig-more#rsa-sha384", "http://www.w3.org/2001/04/xmldsig-more#sha384")]
  67         [InlineData("http://www.w3.org/2001/04/xmldsig-more#rsa-sha512", "http://www.w3.org/2001/04/xmlenc#sha512")]
  68         [InlineData("http://www.w3.org/2001/04/xmldsig-more#rsa-sha256", "http://www.w3.org/2001/04/xmlenc#sha512")]
  69         public void SignedXmlHasVerifiableSignature(string signatureMethod, string digestMethod)
  70         {
  71             using (RSA key = RSA.Create())
  72             {
  73                 var xmlDoc = new XmlDocument();
  74                 xmlDoc.PreserveWhitespace = true;
  75                 xmlDoc.LoadXml(ExampleXml);
  76                 SignXml(xmlDoc, key, signatureMethod, digestMethod);
  77                 Assert.True(VerifyXml(xmlDoc.OuterXml, key));
  78             }
  79         }
  80     }
  81 }