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path: root/crypto/src/asn1/ocsp/CertID.cs
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using System;

using Org.BouncyCastle.Asn1.X509;

namespace Org.BouncyCastle.Asn1.Ocsp
{
    public class CertID
        : Asn1Encodable
    {
		public static CertID GetInstance(object obj)
		{
			if (obj == null)
				return null;
			if (obj is CertID certID)
				return certID;
			return new CertID(Asn1Sequence.GetInstance(obj));
		}

        public static CertID GetInstance(Asn1TaggedObject obj, bool explicitly)
        {
            return new CertID(Asn1Sequence.GetInstance(obj, explicitly));
        }

        private readonly AlgorithmIdentifier m_hashAlgorithm;
        private readonly Asn1OctetString m_issuerNameHash;
        private readonly Asn1OctetString m_issuerKeyHash;
        private readonly DerInteger m_serialNumber;

        public CertID(AlgorithmIdentifier hashAlgorithm, Asn1OctetString issuerNameHash, Asn1OctetString issuerKeyHash,
            DerInteger serialNumber)
        {
            m_hashAlgorithm = hashAlgorithm ?? throw new ArgumentNullException(nameof(hashAlgorithm));
            m_issuerNameHash = issuerNameHash ?? throw new ArgumentNullException(nameof(issuerNameHash));
            m_issuerKeyHash = issuerKeyHash ?? throw new ArgumentNullException(nameof(issuerKeyHash));
            m_serialNumber = serialNumber ?? throw new ArgumentNullException(nameof(serialNumber));
        }

		private CertID(Asn1Sequence seq)
        {
            int count = seq.Count;
			if (count != 4)
                throw new ArgumentException("Bad sequence size: " + count, nameof(seq));

			m_hashAlgorithm = AlgorithmIdentifier.GetInstance(seq[0]);
            m_issuerNameHash = Asn1OctetString.GetInstance(seq[1]);
            m_issuerKeyHash = Asn1OctetString.GetInstance(seq[2]);
            m_serialNumber = DerInteger.GetInstance(seq[3]);
        }

		public AlgorithmIdentifier HashAlgorithm => m_hashAlgorithm;

		public Asn1OctetString IssuerNameHash => m_issuerNameHash;

		public Asn1OctetString IssuerKeyHash => m_issuerKeyHash;

		public DerInteger SerialNumber => m_serialNumber;

		/**
         * Produce an object suitable for an Asn1OutputStream.
         * <pre>
         * CertID          ::=     Sequence {
         *     hashAlgorithm       AlgorithmIdentifier,
         *     issuerNameHash      OCTET STRING, -- Hash of Issuer's DN
         *     issuerKeyHash       OCTET STRING, -- Hash of Issuers public key
         *     serialNumber        CertificateSerialNumber }
         * </pre>
         */
		public override Asn1Object ToAsn1Object()
		{
			return new DerSequence(m_hashAlgorithm, m_issuerNameHash, m_issuerKeyHash, m_serialNumber);
		}
	}
}