I appreciate any advice I can on this issue it has been driving me crazy and I cannot find any documentaion. I am currently trying to generate a self-signed root certificate in C# using the mono security api that meets certain requirements (RSA 2048, SHA256, Etc). I have been successfully able to generate a certificate that meets all of these requirements but one.
I am trying to add a CertificatePoliciesExtension these extensions are usually formatted as follows in X509 certs
[4]: ObjectId: 2.5.29.32 Criticality=false
CertificatePolicies [
[CertificatePolicyId: [some policy oid]
[PolicyQualifierInfo:
[qualifierID: some qualifier oid
qualifier: some ascii encoded byte stream]]]]
My Code Is Below:
private void GenerateRootCertMono(RSACryptoServiceProvider rsa, byte[] serialNumber, string password)
{
// default values
string subject = "CN= company name";
string issuer = "CN=company name";
DateTime notBefore = DateTime.Now;
DateTime notAfter = new DateTime(643445675990000000); // 12/31/2039 23:59:59Z
X509CertificateBuilder cb = new X509CertificateBuilder(3);
cb.SerialNumber = serialNumber;
cb.IssuerName = issuer;
cb.NotBefore = notBefore;
cb.NotAfter = notAfter;
cb.SubjectName = subject;
cb.SubjectPublicKey = rsa;
// extensions
BasicConstraintsExtension bce = new BasicConstraintsExtension();
bce.CertificateAuthority = true;
cb.Extensions.Add(bce);
KeyUsageExtension kue = new KeyUsageExtension();
kue.KeyUsage = KeyUsages.digitalSignature ;
KeyUsageExtension kue1 = new KeyUsageExtension();
kue1.KeyUsage = KeyUsages.keyCertSign;
//my failed attempt to generate a simple Certificate Policy Extension
**ASN1 a = new ASN1 ();
a.Add(ASN1Convert.FromOid("2.5.29.32"));
a.Add(ASN1Convert.FromOid("some oid"));
a.Add(new ASN1 (System.Text.Encoding.ASCII.GetBytes("some text")));
CertificatePoliciesExtension pce = new CertificatePoliciesExtension(a);
cb.Extensions.Add(pce);
cb.Extensions.Add(kue);
cb.Extensions.Add(kue1);
// signature
cb.Hash = "SHA256";
byte[] rawcert = cb.Sign(rsa);
X509Certificate2 pfx = new X509Certificate2(rawcert);
pfx.PrivateKey = rsa;
this.PFX = pfx.Export(X509ContentType.Pkcs12, password);
return;
}
I know generating these extensions is possible because I have seen them in other certificates. Does anyone have any experience or advice? I am also flexible with the API if someone knows how to generate theses extensions using MSCAPI in C# for example that would also be an acceptable solution. Thank you in advance for any help.
After scouring multiple sources I was able to solve this problem by switching from Mono to Microsoft's certenroll.dll. My code for generating a self signed certificate with Policy Extensions is below. Hope this helps anyone having similar problems.
Code based off of the following reference: http://technet.microsoft.com/en-us/library/ff182332(v=ws.10).aspx.