CertificateID.cs
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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.Algorithm.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();
}
/**
* Create a new CertificateID for a new serial number derived from a previous one
* calculated for the same CA certificate.
*
* @param original the previously calculated CertificateID for the CA.
* @param newSerialNumber the serial number for the new certificate of interest.
*
* @return a new CertificateID for newSerialNumber
*/
public static CertificateID DeriveCertificateID(CertificateID original, BigInteger newSerialNumber)
{
return new CertificateID(new CertID(original.id.HashAlgorithm, original.id.IssuerNameHash,
original.id.IssuerKeyHash, new DerInteger(newSerialNumber)));
}
private static CertID CreateCertID(
AlgorithmIdentifier hashAlg,
X509Certificate issuerCert,
DerInteger serialNumber)
{
try
{
String hashAlgorithm = hashAlg.Algorithm.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);
}
}
}
}