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'Encrypt'에 해당되는 글 1건

  1. 2010.01.05 0005. CSXmlDigitalSigniture

0005. CSXmlDigitalSigniture

Sample Codes 2010. 1. 5. 15:15
RSAServiceProvider를 이용해서 xml 파일에 서명 및 Decryption 하는 과정
RSAServiceProvider를 제공된 public key를 이용해서 얻어내는 것이 이 코드의 핵심.



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001.private String publicOnlyKey;
002.private void btnSign_Click(object sender, EventArgs e)
003.{
004.    try
005.    {
006.        /////////////////////////////////////////////////////////////////
007.        // Create a new RSA signing key and export public key for
008.        // verification.
009.         
010.        RSACryptoServiceProvider rsaKey = new RSACryptoServiceProvider();
011.         
012.        //Public Key exported
013.        //Public Key 뿐 아니라 Private Key도 얻어내는 것이 가능하다. 사용자에게 Key를 보내거나 저장할 때 이용 가능
014.        publicOnlyKey = rsaKey.ToXmlString(false);
015.        tbxRSAParameters.Text = publicOnlyKey;
016.         
017.        /////////////////////////////////////////////////////////////////
018.        // Sign the XML document.
019.        //
020. 
021.        SignXml(xmlDoc, rsaKey);
022.        MessageBox.Show("XML file signed.");
023. 
024. 
025.        /////////////////////////////////////////////////////////////////
026.        // Save and display the signed document.
027.        //
028. 
029.        xmlDoc.Save("test1.xml");
030.        tbxDigitalSignature.Text = xmlDoc.OuterXml;
031.    }
032.    catch (Exception ex)
033.    {
034.        Console.WriteLine(ex.Message);
035.    }
036.}
037. 
038.///XML파일을 RSA를 이용해서 서명. SignedXml class가 있는 것을 기억하고 있을것!
039.public static void SignXml(XmlDocument Doc, RSA Key)
040.{
041.    // Check arguments.
042.    if (Doc == null)
043.        throw new ArgumentException("Doc");
044.    if (Key == null)
045.        throw new ArgumentException("Key");
046. 
047.    try
048.    {
049.        // Create a SignedXml object to generate signature.
050.        SignedXml signedXml = new SignedXml(Doc);
051. 
052.        // Add the key to the SignedXml document
053.        signedXml.SigningKey = Key;
054. 
055.        // Create a reference to be signed
056.        Reference reference = new Reference();
057.        reference.Uri = "";
058. 
059.        // Add an enveloped transformation to the reference
060.        XmlDsigEnvelopedSignatureTransform env = new XmlDsigEnvelopedSignatureTransform();
061.        reference.AddTransform(env);
062. 
063.        // Add the reference to the SignedXml object
064.        signedXml.AddReference(reference);
065. 
066.        // Compute the signature
067.        signedXml.ComputeSignature();
068. 
069.        // Get the XML representation of the signature and save
070.        // it to an XmlElement object.
071.        XmlElement xmlDigitalSignature = signedXml.GetXml();
072. 
073.        // Append the element to the XML document.
074.        Doc.DocumentElement.AppendChild(Doc.ImportNode(xmlDigitalSignature, true));
075.    }
076.    catch (Exception ex)
077.    {
078.        MessageBox.Show(ex.Message);
079.    }
080.}
081. 
082.private void btnVerify_Click(object sender, EventArgs e)
083.{
084.    /////////////////////////////////////////////////////////////////////
085.    // Create a new RSA signing key and import public key for
086.    // verification.
087.    //
088. 
089.    //NOTE:Public RSA Key를 이용해서 RSACryptoService Generate
090.    RSACryptoServiceProvider rsaKey = new RSACryptoServiceProvider();
091.    rsaKey.FromXmlString(publicOnlyKey);
092.    /////////////////////////////////////////////////////////////////////
093.    // Load the signed XML, and call VerifyXml to verify the signature of
094.    // the signed XML.
095.    //
096. 
097.    XmlDocument xmlDoc = new XmlDocument();
098.    xmlDoc.Load("test1.xml");
099. 
100.    bool result = VerifyXml(xmlDoc, rsaKey);
101. 
102.    if (result)
103.    {
104.        MessageBox.Show("The XML signature is valid.");
105.    }
106.    else
107.    {
108.        MessageBox.Show("The XML signature is not valid.");
109.    }
110.}
111. 
112.public static Boolean VerifyXml(XmlDocument Doc, RSA Key)
113.{
114.    // Check arguments.
115.    if (Doc == null)
116.        throw new ArgumentException("Doc");
117.    if (Key == null)
118.        throw new ArgumentException("Key");
119. 
120. 
121.    /////////////////////////////////////////////////////////////////////
122.    // Create a SignedXml object to verify the signature
123.    //
124. 
125.    SignedXml signedXml = new SignedXml(Doc);
126. 
127.    // Find Signature node and create a new XmlNodeList object
128.    XmlNodeList nodeList = Doc.GetElementsByTagName("Signature");
129. 
130.    // Throw an exception if no signature was found.
131.    if (nodeList.Count <= 0)
132.    {
133.        throw new CryptographicException(
134.            "Verification failed:" +
135.            " No Signature was found in the document.");
136.    }
137. 
138.    // This example only supports one signature for entire XML document
139.    if (nodeList.Count >= 2)
140.    {
141.        throw new CryptographicException(
142.            "Verification failed: More that one signature was found.");
143.    }
144. 
145.    // Load the first <signature> node. 
146.    signedXml.LoadXml((XmlElement)nodeList[0]);
147. 
148.    // Check the signature and return the result.
149.    return signedXml.CheckSignature(Key);
150.}
151. 
152.private void btnChangeXML_Click(object sender, EventArgs e)
153.{
154.    // Modify the value of the Xml document for test.
155. 
156.    XDocument xDoc = XDocument.Load("test1.xml");
157. 
158.    if (xDoc != null)
159.    {
160.        xDoc.Element("invoice").Element("items").
161.            Element("creditcard").Element("number").SetValue("19834210");
162. 
163.        xDoc.Save("test1.xml");
164. 
165.        tbxModifiedMessage.Text = xDoc.ToString();
166.    }
167.}
168.</signature>
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