x509certificate2

Export X509Certificate2 to byte array with the Private key

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The Export function of the X509Certificate2 class allows you to export a certificate with the private key to a byte array. The following code demonstrates exporting a certificate with the private key: X509Store store = new X509Store(StoreLocation.CurrentUser); store.Open(OpenFlags.ReadOnly); X509Certificate2 cert = store.Certificates[1]; // Export the certificate including the private key. byte[] certBytes = cert.Export(X509ContentType.Pkcs12); To … Read more

What is the rationale for all the different X509KeyStorageFlags?

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Mainly, it has to be this complicated today because it was this complicated yesterday and no one has come up with anything simpler. I can’t come up with a linear narrative here, so please endure the weaving back and forth that’s required. What is a PFX/PKCS#12 file? While I can’t fully say what the origins … Read more

How to create a completely new x509Certificate2 in .Net?

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Checkout CertificateRequest (Name Space: System.Security.Cryptography.X509Certificates)… public static X509Certificate2 GenerateSelfSignedCertificate() { string secp256r1Oid = “1.2.840.10045.3.1.7”; //oid for prime256v1(7) other identifier: secp256r1 string subjectName = “Self-Signed-Cert-Example”; var ecdsa = ECDsa.Create(ECCurve.CreateFromValue(secp256r1Oid)); var certRequest = new CertificateRequest($”CN={subjectName}”, ecdsa, HashAlgorithmName.SHA256); //add extensions to the request (just as an example) //add keyUsage certRequest.CertificateExtensions.Add(new X509KeyUsageExtension(X509KeyUsageFlags.DigitalSignature, true)); X509Certificate2 generatedCert = certRequest.CreateSelfSigned(DateTimeOffset.Now.AddDays(-1), DateTimeOffset.Now.AddYears(10)); // … Read more

How to create a valid, self-signed X509Certificate2 programmatically, not loading from file in .NET Core

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I found this other SO question that put me on the right track. Certificates API was added to .Net Core on 2.0 version. I have a function like the next one to create self signed certificates that I later import into My store to use them on IIS. private X509Certificate2 buildSelfSignedServerCertificate() { SubjectAlternativeNameBuilder sanBuilder = … Read more

How can constructing an X509Certificate2 from a PKCS#12 byte array throw CryptographicException(“The system cannot find the file specified.”)?

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Do you have PKCS#12 or just PFX-file? In the Microsoft world it is the same, but other think another (see this archived page). You can try just following X509Certificate2 cert = X509Certificate2(byte[] rawData, “password”); X509Certificate2 cert2 = X509Certificate2(byte[] rawData, “password”, X509KeyStorageFlags.MachineKeySet | X509KeyStorageFlags.PersistKeySet | X509KeyStorageFlags.Exportable); (X509Certificate2(Byte[])) or X509Certificate2 cert = X509Certificate2(“C:\Path\my.pfx”, “password”); (see X509Certificate2(String, String) … Read more

Exporting a Certificate as BASE-64 encoded .cer

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Perhaps /// <summary> /// Export a certificate to a PEM format string /// </summary> /// <param name=”cert”>The certificate to export</param> /// <returns>A PEM encoded string</returns> public static string ExportToPEM(X509Certificate cert) { StringBuilder builder = new StringBuilder(); builder.AppendLine(“—–BEGIN CERTIFICATE—–“); builder.AppendLine(Convert.ToBase64String(cert.Export(X509ContentType.Cert), Base64FormattingOptions.InsertLineBreaks)); builder.AppendLine(“—–END CERTIFICATE—–“); return builder.ToString(); }

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