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package org.bouncycastle.asn1.isismtt.ocsp;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
/**
* ISIS-MTT PROFILE: The responder may include this extension in a response to
* send the hash of the requested certificate to the responder. This hash is
* cryptographically bound to the certificate and serves as evidence that the
* certificate is known to the responder (i.e. it has been issued and is present
* in the directory). Hence, this extension is a means to provide a positive
* statement of availability as described in T8.[8]. As explained in T13.[1],
* clients may rely on this information to be able to validate signatures after
* the expiry of the corresponding certificate. Hence, clients MUST support this
* extension. If a positive statement of availability is to be delivered, this
* extension syntax and OID MUST be used.
* <pre>
* CertHash ::= SEQUENCE {
* hashAlgorithm AlgorithmIdentifier,
* certificateHash OCTET STRING
* }
* </pre>
*/
public class CertHash
extends ASN1Object
{
private AlgorithmIdentifier hashAlgorithm;
private byte[] certificateHash;
public static CertHash getInstance(Object obj)
{
if (obj == null || obj instanceof CertHash)
{
return (CertHash)obj;
}
if (obj instanceof ASN1Sequence)
{
return new CertHash((ASN1Sequence)obj);
}
throw new IllegalArgumentException("illegal object in getInstance: "
+ obj.getClass().getName());
}
/**
* Constructor from ASN1Sequence.
* <p>
* The sequence is of type CertHash:
* <pre>
* CertHash ::= SEQUENCE {
* hashAlgorithm AlgorithmIdentifier,
* certificateHash OCTET STRING
* }
* </pre>
* </p>
* @param seq The ASN.1 sequence.
*/
private CertHash(ASN1Sequence seq)
{
if (seq.size() != 2)
{
throw new IllegalArgumentException("Bad sequence size: "
+ seq.size());
}
hashAlgorithm = AlgorithmIdentifier.getInstance(seq.getObjectAt(0));
certificateHash = DEROctetString.getInstance(seq.getObjectAt(1)).getOctets();
}
/**
* Constructor from a given details.
*
* @param hashAlgorithm The hash algorithm identifier.
* @param certificateHash The hash of the whole DER encoding of the certificate.
*/
public CertHash(AlgorithmIdentifier hashAlgorithm, byte[] certificateHash)
{
this.hashAlgorithm = hashAlgorithm;
this.certificateHash = new byte[certificateHash.length];
System.arraycopy(certificateHash, 0, this.certificateHash, 0,
certificateHash.length);
}
public AlgorithmIdentifier getHashAlgorithm()
{
return hashAlgorithm;
}
public byte[] getCertificateHash()
{
return certificateHash;
}
/**
* Produce an object suitable for an ASN1OutputStream.
* <p>
* Returns:
* <pre>
* CertHash ::= SEQUENCE {
* hashAlgorithm AlgorithmIdentifier,
* certificateHash OCTET STRING
* }
* </pre>
*
* @return a DERObject
*/
public ASN1Primitive toASN1Primitive()
{
ASN1EncodableVector vec = new ASN1EncodableVector();
vec.add(hashAlgorithm);
vec.add(new DEROctetString(certificateHash));
return new DERSequence(vec);
}
}
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