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using System;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1.X509
{
/**
* The DigestInfo object.
* <pre>
* DigestInfo::=Sequence{
* digestAlgorithm AlgorithmIdentifier,
* digest OCTET STRING }
* </pre>
*/
public class DigestInfo
: Asn1Encodable
{
private readonly byte[] digest;
private readonly AlgorithmIdentifier algID;
public static DigestInfo GetInstance(
Asn1TaggedObject obj,
bool explicitly)
{
return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
}
public static DigestInfo GetInstance(
object obj)
{
if (obj is DigestInfo)
{
return (DigestInfo) obj;
}
if (obj is Asn1Sequence)
{
return new DigestInfo((Asn1Sequence) obj);
}
throw new ArgumentException("unknown object in factory: " + Platform.GetTypeName(obj), "obj");
}
public DigestInfo(
AlgorithmIdentifier algID,
byte[] digest)
{
this.digest = digest;
this.algID = algID;
}
private DigestInfo(
Asn1Sequence seq)
{
if (seq.Count != 2)
throw new ArgumentException("Wrong number of elements in sequence", "seq");
algID = AlgorithmIdentifier.GetInstance(seq[0]);
digest = Asn1OctetString.GetInstance(seq[1]).GetOctets();
}
public AlgorithmIdentifier AlgorithmID
{
get { return algID; }
}
public byte[] GetDigest()
{
return digest;
}
public override Asn1Object ToAsn1Object()
{
return new DerSequence(algID, new DerOctetString(digest));
}
}
}
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