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package org.spongycastle.asn1.cmp;
import org.spongycastle.asn1.ASN1Encodable;
import org.spongycastle.asn1.ASN1EncodableVector;
import org.spongycastle.asn1.ASN1Object;
import org.spongycastle.asn1.ASN1OctetString;
import org.spongycastle.asn1.ASN1Primitive;
import org.spongycastle.asn1.ASN1Sequence;
import org.spongycastle.asn1.DEROctetString;
import org.spongycastle.asn1.DERSequence;
import org.spongycastle.asn1.x509.AlgorithmIdentifier;
public class Challenge
extends ASN1Object
{
private AlgorithmIdentifier owf;
private ASN1OctetString witness;
private ASN1OctetString challenge;
private Challenge(ASN1Sequence seq)
{
int index = 0;
if (seq.size() == 3)
{
owf = AlgorithmIdentifier.getInstance(seq.getObjectAt(index++));
}
witness = ASN1OctetString.getInstance(seq.getObjectAt(index++));
challenge = ASN1OctetString.getInstance(seq.getObjectAt(index));
}
public static Challenge getInstance(Object o)
{
if (o instanceof Challenge)
{
return (Challenge)o;
}
if (o != null)
{
return new Challenge(ASN1Sequence.getInstance(o));
}
return null;
}
public Challenge(byte[] witness, byte[] challenge)
{
this(null, witness, challenge);
}
public Challenge(AlgorithmIdentifier owf, byte[] witness, byte[] challenge)
{
this.owf = owf;
this.witness = new DEROctetString(witness);
this.challenge = new DEROctetString(challenge);
}
public AlgorithmIdentifier getOwf()
{
return owf;
}
public byte[] getWitness()
{
return witness.getOctets();
}
public byte[] getChallenge()
{
return challenge.getOctets();
}
/**
* <pre>
* Challenge ::= SEQUENCE {
* owf AlgorithmIdentifier OPTIONAL,
*
* -- MUST be present in the first Challenge; MAY be omitted in
* -- any subsequent Challenge in POPODecKeyChallContent (if
* -- omitted, then the owf used in the immediately preceding
* -- Challenge is to be used).
*
* witness OCTET STRING,
* -- the result of applying the one-way function (owf) to a
* -- randomly-generated INTEGER, A. [Note that a different
* -- INTEGER MUST be used for each Challenge.]
* challenge OCTET STRING
* -- the encryption (under the public key for which the cert.
* -- request is being made) of Rand, where Rand is specified as
* -- Rand ::= SEQUENCE {
* -- int INTEGER,
* -- - the randomly-generated INTEGER A (above)
* -- sender GeneralName
* -- - the sender's name (as included in PKIHeader)
* -- }
* }
* </pre>
* @return a basic ASN.1 object representation.
*/
public ASN1Primitive toASN1Primitive()
{
ASN1EncodableVector v = new ASN1EncodableVector();
addOptional(v, owf);
v.add(witness);
v.add(challenge);
return new DERSequence(v);
}
private void addOptional(ASN1EncodableVector v, ASN1Encodable obj)
{
if (obj != null)
{
v.add(obj);
}
}
}
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