MacData
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Math;
using System;
namespace Org.BouncyCastle.Asn1.Pkcs
{
public class MacData : Asn1Encodable
{
private readonly DigestInfo m_mac;
private readonly Asn1OctetString m_macSalt;
private readonly DerInteger m_iterations;
public DigestInfo Mac => m_mac;
public BigInteger IterationCount => m_iterations.Value;
public DerInteger Iterations => m_iterations;
public Asn1OctetString MacSalt => m_macSalt;
public static MacData GetInstance(object obj)
{
if (obj == null)
return null;
MacData macData = obj as MacData;
if (macData != null)
return macData;
return new MacData(Asn1Sequence.GetInstance(obj));
}
public static MacData GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
return new MacData(Asn1Sequence.GetInstance(taggedObject, declaredExplicit));
}
public static MacData GetTagged(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
return new MacData(Asn1Sequence.GetTagged(taggedObject, declaredExplicit));
}
private MacData(Asn1Sequence seq)
{
int count = seq.Count;
int sequencePosition = 0;
if (count < 2 || count > 3)
throw new ArgumentException("Bad sequence size: " + count.ToString(), "seq");
m_mac = DigestInfo.GetInstance(seq[sequencePosition++]);
m_macSalt = Asn1OctetString.GetInstance(seq[sequencePosition++]);
m_iterations = (Asn1Utilities.ReadOptional(seq, ref sequencePosition, DerInteger.GetOptional) ?? DerInteger.One);
if (sequencePosition != count)
throw new ArgumentException("Unexpected elements in sequence", "seq");
}
public MacData(DigestInfo digInfo, byte[] salt, int iterationCount)
{
if (digInfo == null)
throw new ArgumentNullException("digInfo");
m_mac = digInfo;
m_macSalt = DerOctetString.FromContents(salt);
m_iterations = new DerInteger(iterationCount);
}
public MacData(DigestInfo mac, Asn1OctetString macSalt, DerInteger iterations)
{
if (mac == null)
throw new ArgumentNullException("mac");
m_mac = mac;
if (macSalt == null)
throw new ArgumentNullException("macSalt");
m_macSalt = macSalt;
if (iterations == null)
throw new ArgumentNullException("iterations");
m_iterations = iterations;
}
public byte[] GetSalt()
{
return (byte[])m_macSalt.GetOctets().Clone();
}
public override Asn1Object ToAsn1Object()
{
if (!m_iterations.HasValue(1))
return new DerSequence(m_mac, m_macSalt, m_iterations);
return new DerSequence(m_mac, m_macSalt);
}
}
}