List <Byte> buildTbs(Byte[] signatureAlgorithm, X509Certificate2 issuer)
{
if (String.IsNullOrEmpty(issuer.Issuer))
{
throw new ArgumentException("Subject name is empty.");
}
// coerce hashing algorithm
if (HashingAlgorithm == null)
{
HashingAlgorithm = new Oid(AlgorithmOids.SHA256);
}
// coerce version
if (_extensions.Count > 0)
{
Version = 2;
}
// coerce validity
if (NextUpdate == null || NextUpdate.Value <= ThisUpdate)
{
NextUpdate = ThisUpdate.AddDays(7);
}
var rawBytes = new List <Byte>();
// algorithm
rawBytes.AddRange(signatureAlgorithm);
// issuer
rawBytes.AddRange(issuer.SubjectName.RawData);
// thisUpdate
rawBytes.AddRange(Asn1Utils.EncodeDateTime(ThisUpdate));
// nextUpdate. Not null at this point, because we do not support CRL generation with infinity validity.
rawBytes.AddRange(Asn1Utils.EncodeDateTime(NextUpdate.Value));
// revokedCerts
if (RevokedCertificates.Count > 0)
{
rawBytes.AddRange(RevokedCertificates.Encode());
RevokedCertificates.Close();
}
// extensions
if (Version == 2)
{
// insert version at the beginning.
rawBytes.InsertRange(0, new Asn1Integer(Version - 1).RawData);
generateExtensions(issuer);
rawBytes.AddRange(Asn1Utils.Encode(Extensions.Encode(), 160));
}
// generate tbs
return(new List <Byte>(Asn1Utils.Encode(rawBytes.ToArray(), 48)));
}
/// <summary>
/// Create a new CertificateRevocationListBuilder.
/// </summary>
/// <param name="issuer">Certificate authority used to issue the CRL.</param>
/// <param name="crlNumber">Unique CRL number.</param>
public CertificateRevocationListBuilder(X509Certificate2 issuer, ulong crlNumber)
: base(issuer)
{
// Base class does the validation when issuer is not null.
if (issuer == null)
{
throw new ArgumentNullException(nameof(issuer));
}
// Bouncy Castle cannot construct BigInteger from a number.
CrlNumber = new BigInteger(crlNumber.ToString(CultureInfo.InvariantCulture));
// Per RFC 5280 the date should be in UTC.
ThisUpdate = DateTime.UtcNow;
// Per DirectTrust Community X.509 Certificate Policy
// a new CRL must be generated at least every 30 days.
NextUpdate = ThisUpdate.AddDays(30);
// List of revoked certificates.
RevokedCertificates = new List <Tuple <BigInteger, DateTime> >();
}
