Reading a Base64 string value of a digital certificate using Chilkat

In this post, I’m going to show how to read details of a digital certificate using Chilkat library from a Base64 string.

The below is my model of the details I want to read from the certificate.

    public class CertificateModel
    {
        public string SerialNumber { get; }
        public string AuthorityKeyIdentifier { get; }
        public string OcspUrl { get; }
        public DateTime ValidFromUtc { get; }
        public DateTime ValidToUtc { get; }
        public string SubjectName { get; }
        public string Email { get; }
        public string Abn { get; }
        public string IssuingOrganisation { get; }
        public CertificateAssuranceLevelEnum? AssuranceLevel { get; }
        public bool IsSigningCertificate { get; }
        public string Pem { get; }

        public CertificateModel(
            string serialNumber,
            string authorityKeyIdentifier,
            string ocspUrl,
            DateTime validFromUtc,
            DateTime validToUtc,
            string subjectName,
            string email,
            string abn,
            string issuingOrganisation,
            CertificateAssuranceLevelEnum? assuranceLevel,
            bool isSigningCertificate,
            string pem)
        {
            SerialNumber = serialNumber;
            AuthorityKeyIdentifier = authorityKeyIdentifier;
            OcspUrl = ocspUrl;
            ValidFromUtc = validFromUtc;
            ValidToUtc = validToUtc;
            CommonName = commonName;
            Email = email;
            Abn = abn;
            Pem = pem;
            IssuingOrganisation = issuingOrganisation;
            AssuranceLevel = assuranceLevel;
            IsSigningCertificate = isSigningCertificate;
        }
    }

Here is the method to read in the certificate

        public CertificateModel Decode(string base64Value)
        {
            var cert = ChilkatHelpers.Cert(base64Value);
            var validFrom = cert.ValidFromUtc();
            var validTo = cert.ValidToUtc();

            var subjectName = cert.SubjectCN;
            var email = cert.UserEmail();
            var abn = cert.Abn();
            var assuranceLevel = cert.AssuranceLevel();

            var issuingOrganisation = cert.IssuerO;

            var keyUsage = (X509KeyUsageFlags)cert.IntendedKeyUsage;
            var isSigningCertificate = keyUsage.HasFlag(X509KeyUsageFlags.DigitalSignature);

            var pem = cert.ExportCertPem();

            return new CertificateModel(
                 cert.SerialDecimal,
                 cert.AuthorityKeyId,
                 cert.OcspUrl,
                 validFrom,
                 validTo,
                 subjectName,
                 email,
                 abn,
                 issuingOrganisation,
                 assuranceLevel,
                 isSigningCertificate,
                 pem);
        }