CertificateID.cs :  » PDF » iTextSharp » Org » BouncyCastle » Ocsp » C# / CSharp Open Source

using System;

using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.Ocsp;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.X509;

namespace Org.BouncyCastle.Ocsp{
  public class CertificateID
  {
    public const string HashSha1 = "1.3.14.3.2.26";

    private readonly CertID id;

    public CertificateID(
      CertID id)
    {
      if (id == null)
        throw new ArgumentNullException("id");

      this.id = id;
    }

    /**
     * create from an issuer certificate and the serial number of the
     * certificate it signed.
     * @exception OcspException if any problems occur creating the id fields.
     */
    public CertificateID(
      string      hashAlgorithm,
      X509Certificate  issuerCert,
      BigInteger    serialNumber)
    {
      AlgorithmIdentifier hashAlg = new AlgorithmIdentifier(
        new DerObjectIdentifier(hashAlgorithm), DerNull.Instance);

      this.id = createCertID(hashAlg, issuerCert, new DerInteger(serialNumber));
    }

    public string HashAlgOid
    {
      get { return id.HashAlgorithm.ObjectID.Id; }
    }

    public byte[] GetIssuerNameHash()
    {
      return id.IssuerNameHash.GetOctets();
    }

    public byte[] GetIssuerKeyHash()
    {
      return id.IssuerKeyHash.GetOctets();
    }

    /**
     * return the serial number for the certificate associated
     * with this request.
     */
    public BigInteger SerialNumber
    {
      get { return id.SerialNumber.Value; }
    }

    public bool MatchesIssuer(
      X509Certificate  issuerCert)
    {
      return createCertID(id.HashAlgorithm, issuerCert, id.SerialNumber).Equals(id);
    }

    public CertID ToAsn1Object()
    {
      return id;
    }

    public override bool Equals(
      object obj)
    {
      if (obj == this)
        return true;

      CertificateID other = obj as CertificateID;

      if (other == null)
        return false;

      return id.ToAsn1Object().Equals(other.id.ToAsn1Object());
    }

    public override int GetHashCode()
    {
      return id.ToAsn1Object().GetHashCode();
    }

        private static CertID createCertID(
      AlgorithmIdentifier  hashAlg,
      X509Certificate    issuerCert,
      DerInteger      serialNumber)
    {
      try
      {
        String hashAlgorithm = hashAlg.ObjectID.Id;

        X509Name issuerName = PrincipalUtilities.GetSubjectX509Principal(issuerCert);
        byte[] issuerNameHash = DigestUtilities.CalculateDigest(
          hashAlgorithm, issuerName.GetEncoded());

        AsymmetricKeyParameter issuerKey = issuerCert.GetPublicKey();
        SubjectPublicKeyInfo info = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(issuerKey);
        byte[] issuerKeyHash = DigestUtilities.CalculateDigest(
          hashAlgorithm, info.PublicKeyData.GetBytes());

        return new CertID(hashAlg, new DerOctetString(issuerNameHash),
          new DerOctetString(issuerKeyHash), serialNumber);
      }
      catch (Exception e)
      {
        throw new OcspException("problem creating ID: " + e, e);
      }
    }
  }
}