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This program generates a signature that passes validation by the rimtool.

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This commit is contained in:
chubtub 2022-07-19 18:06:57 -04:00
parent 223fc15cc4
commit 6a173fe162
1 changed files with 31 additions and 18 deletions
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45
tools/tcg_rim_tool/microsoftXmlDsig.cs
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@ -4,6 +4,20 @@ using System.Security.Cryptography.X509Certificates;
using System.Security.Cryptography.Xml;
using System.Xml;
/**
* This program reads in the following files:
* 1. Public certificate, pem format
* 2. Corresponding private key, pem format
* 3. Unsigned xml document
* 4. Signed xml document
* The two functions are SignXml() and VerifyXml() and are called in succession.
*
* XmlDocument.PreserveWhitespace(false) allows the subsequent signed xml document
* to pass validation.
*
* VerifyXml() strictly checks the cryptographic integrity of the Signature block,
* it does not verify the integrity of the certificate chain.
*/
public class VerifyXML
{
@ -14,6 +28,9 @@ public class VerifyXML
const string signingAlgorithm = "http://www.w3.org/2001/04/xmldsig-more#ecdsa-sha256";
const string signingCertName = "RimSignCert.pem";
const string privateKeyFilename = "privateRimKey.pem";
const string unsignedFilename = "unsigned.xml";
const string signedFilename = "signed.xml";
const string signedRIM = "signedRIM.swidtag";
//Load public cert from file
X509Certificate2 signingCert = new X509Certificate2(signingCertName);
@ -26,21 +43,20 @@ public class VerifyXML
// Load an XML file into the XmlDocument object.
XmlDocument unsignedDoc = new XmlDocument();
unsignedDoc.PreserveWhitespace = true;
unsignedDoc.Load("unsigned.xml");
unsignedDoc.Load(unsignedFilename);
SignXml(unsignedDoc, privateKey);
unsignedDoc.Save("signed.xml");
unsignedDoc.Save(signedFilename);
// Verify the signature of the signed XML.
XmlDocument signedDoc = new XmlDocument();
signedDoc.Load("signed.xml");
signedDoc.Load(signedFilename);
bool result = VerifyXml(signedDoc, publicKey);
// Display the results of the signature verification to
// the console.
if (result)
{
Console.WriteLine("The XML signature is valid.");
Console.WriteLine("The XML signature is valid!");
}
else
{
@ -78,6 +94,11 @@ public class VerifyXML
// Add the reference to the SignedXml object.
signedXml.AddReference(reference);
// Add keyinfo block
KeyInfo keyInfo = new KeyInfo();
keyInfo.AddClause(new RSAKeyValue((RSA)rsaKey));
signedXml.KeyInfo = keyInfo;
// Compute the signature.
signedXml.ComputeSignature();
@ -92,7 +113,7 @@ public class VerifyXML
// Verify the signature of an XML file against an asymmetric
// algorithm and return the result.
public static Boolean VerifyXml(XmlDocument xmlDoc, RSA key)
private static Boolean VerifyXml(XmlDocument xmlDoc, RSA key)
{
// Check arguments.
if (xmlDoc == null)
@ -129,7 +150,8 @@ public class VerifyXML
try
{
isValid = signedXml.CheckSignature(key);
} catch (Exception e)
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
@ -139,12 +161,3 @@ public class VerifyXML
}
}
//6/17/2022
//Copied RimSignCert.pem, RimCertChain.pem, and generated_user_cert_embed.swidtag to EC2.
//Tried reading RimSignCert and RimCertChain (both certs and each cert by itself) and extracting the PK, validation failed all attempts.
//Verified that swidtag is in fact signed by RimSignCert's private key.
//
//7/11/2022
//Copied RimSignCert.pem, generated_user_cert_embed.swidtag (less the signature block), and privateRimKey.pem to EC2.
//Tried signing the unsigned RIM with the private key and then validated with the public key from the cert; unsuccessful.