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using System;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1.Nist
{
/// <summary>
/// KMACwithSHAKE128-params ::= SEQUENCE {
/// kMACOutputLength INTEGER DEFAULT 256, -- Output length in bits
/// customizationString OCTET STRING DEFAULT ''H
/// }
/// </summary>
public class KMacWithShake128Params
: Asn1Encodable
{
private const int _DefaultOutputLength = 256;
public static readonly DerInteger DefaultOutputLength = new DerInteger(_DefaultOutputLength);
public static readonly Asn1OctetString DefaultCustomizationString = DerOctetString.Empty;
public static KMacWithShake128Params GetInstance(object o)
{
if (o == null)
return null;
if (o is KMacWithShake128Params kMacWithShake128Params)
return kMacWithShake128Params;
return new KMacWithShake128Params(Asn1Sequence.GetInstance(o));
}
public static KMacWithShake128Params GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit) =>
new KMacWithShake128Params(Asn1Sequence.GetInstance(taggedObject, declaredExplicit));
public static KMacWithShake128Params GetTagged(Asn1TaggedObject taggedObject, bool declaredExplicit) =>
new KMacWithShake128Params(Asn1Sequence.GetTagged(taggedObject, declaredExplicit));
private readonly DerInteger m_outputLength;
private readonly Asn1OctetString m_customizationString;
private KMacWithShake128Params(Asn1Sequence seq)
{
int count = seq.Count, pos = 0;
if (count < 0 || count > 2)
throw new ArgumentException("Bad sequence size: " + count, nameof(seq));
m_outputLength = Asn1Utilities.ReadOptional(seq, ref pos, DerInteger.GetOptional)
?? DefaultOutputLength;
m_customizationString = Asn1Utilities.ReadOptional(seq, ref pos, Asn1OctetString.GetOptional)
?? DefaultCustomizationString;
if (pos != count)
throw new ArgumentException("Unexpected elements in sequence", nameof(seq));
}
public KMacWithShake128Params(int outputLength)
{
m_outputLength = new DerInteger(outputLength);
m_customizationString = DefaultCustomizationString;
}
public KMacWithShake128Params(int outputLength, byte[] customizationString)
{
m_outputLength = new DerInteger(outputLength);
m_customizationString = new DerOctetString(customizationString);
}
public int OutputLength => m_outputLength.IntValueExact;
public byte[] CustomizationString => Arrays.Clone(m_customizationString.GetOctets());
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector(2);
if (!m_outputLength.HasValue(_DefaultOutputLength))
{
v.Add(m_outputLength);
}
if (m_customizationString.GetOctetsLength() != 0)
{
v.Add(m_customizationString);
}
return new DerSequence(v);
}
}
}
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