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using Org.BouncyCastle.Utilities;
using System;
namespace Org.BouncyCastle.Asn1.Nist
{
/// <summary>
/// KMACwithSHAKE256-params ::= SEQUENCE {
/// kMACOutputLength INTEGER DEFAULT 512, -- Output length in bits
/// customizationString OCTET STRING DEFAULT ''H
/// }
/// </summary>
public class KMacWithShake256Params : Asn1Encodable
{
private static readonly byte[] EMPTY_STRING = new byte[0];
private static readonly int DEF_LENGTH = 512;
private readonly int outputLength;
private readonly byte[] customizationString;
public KMacWithShake256Params(int outputLength)
{
this.outputLength = outputLength;
this.customizationString = EMPTY_STRING;
}
public KMacWithShake256Params(int outputLength, byte[] customizationString)
{
this.outputLength = outputLength;
this.customizationString = Arrays.Clone(customizationString);
}
public static KMacWithShake256Params GetInstance(object o)
{
if (o is KMacWithShake256Params)
{
return (KMacWithShake256Params)o;
}
else if (o != null)
{
return new KMacWithShake256Params(Asn1Sequence.GetInstance(o));
}
return null;
}
private KMacWithShake256Params(Asn1Sequence seq)
{
if (seq.Count > 2)
throw new InvalidOperationException("sequence size greater than 2");
if (seq.Count == 2)
{
this.outputLength = DerInteger.GetInstance(seq[0]).IntValueExact;
this.customizationString = Arrays.Clone(Asn1OctetString.GetInstance(seq[1]).GetOctets());
}
else if (seq.Count == 1)
{
if (seq[0] is DerInteger)
{
this.outputLength = DerInteger.GetInstance(seq[0]).IntValueExact;
this.customizationString = EMPTY_STRING;
}
else
{
this.outputLength = DEF_LENGTH;
this.customizationString = Arrays.Clone(Asn1OctetString.GetInstance(seq[0]).GetOctets());
}
}
else
{
this.outputLength = DEF_LENGTH;
this.customizationString = EMPTY_STRING;
}
}
public int OutputLength
{
get { return outputLength; }
}
public byte[] CustomizationString
{
get { return Arrays.Clone(customizationString); }
}
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector(2);
if (outputLength != DEF_LENGTH)
{
v.Add(new DerInteger(outputLength));
}
if (customizationString.Length != 0)
{
v.Add(new DerOctetString(CustomizationString));
}
return new DerSequence(v);
}
}
}
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