X509CertificateExtensions.cs

// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.

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

namespace Microsoft.AspNetCore.Authentication.Certificate
{
    /// <summary>
    /// Extension methods for <see cref="X509Certificate2"/>.
    /// </summary>
    public static class X509Certificate2Extensions
    {
        /// <summary>
        /// Determines if the certificate is self signed.
        /// </summary>
        /// <param name="certificate">The <see cref="X509Certificate2"/>.</param>
        /// <returns>True if the certificate is self signed.</returns>
        public static bool IsSelfSigned(this X509Certificate2 certificate)
        {
            Span<byte> subject = certificate.SubjectName.RawData;
            Span<byte> issuer = certificate.IssuerName.RawData;
            return subject.SequenceEqual(issuer);
        }
    }
}