X509Certificate2.Thumbprint Property - .NET

Property Value

public string Thumbprint { get; }

Gets the thumbprint of the X.509 certificate. The thumbprint is a hash of the certificate's public key and other identifying information. It is commonly used to uniquely identify a certificate on a local computer.

Remarks

The thumbprint is generated using the SHA1 hash algorithm.

The thumbprint is represented as a hexadecimal string without any separators (e.g., "a90591a2c2f273d290b24e301f8749128835c509").

This property is read-only and can be accessed without needing to open the certificate in a store.

Examples

using System;
using System.Security.Cryptography.X509Certificates;

public class Example
{
    public static void Main(string[] args)
    {
        // Load a certificate from the CurrentUser personal store
        using (X509Store store = new X509Store("My", StoreLocation.CurrentUser))
        {
            store.Open(OpenFlags.ReadOnly);
            X509Certificate2Collection certificates = (X509Certificate2Collection)store.Certificates;

            if (certificates.Count > 0)
            {
                // Get the first certificate in the collection
                X509Certificate2 cert = certificates[0];

                // Get and display the thumbprint
                string thumbprint = cert.Thumbprint;
                Console.WriteLine($"Certificate Thumbprint: {thumbprint}");
            }
            else
            {
                Console.WriteLine("No certificates found in the CurrentUser personal store.");
            }
        }
    }
}

Requirements

Namespace: System.Net.Security

Assembly: System.Net.Security.dll

Exceptions
This property does not throw an exception.