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using System;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1.Cmp
{
public class Challenge
: Asn1Encodable
{
private readonly AlgorithmIdentifier owf;
private readonly Asn1OctetString witness;
private readonly Asn1OctetString challenge;
private Challenge(Asn1Sequence seq)
{
int index = 0;
if (seq.Count == 3)
{
owf = AlgorithmIdentifier.GetInstance(seq[index++]);
}
witness = Asn1OctetString.GetInstance(seq[index++]);
challenge = Asn1OctetString.GetInstance(seq[index]);
}
public static Challenge GetInstance(object obj)
{
if (obj is Challenge)
return (Challenge)obj;
if (obj is Asn1Sequence)
return new Challenge((Asn1Sequence)obj);
throw new ArgumentException("Invalid object: " + Platform.GetTypeName(obj), "obj");
}
public virtual AlgorithmIdentifier Owf
{
get { return owf; }
}
/**
* <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 override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector();
v.AddOptional(owf);
v.Add(witness, challenge);
return new DerSequence(v);
}
}
}
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