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using System;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Pqc.Asn1
{
/**
* See https://datatracker.ietf.org/doc/draft-uni-qsckeys-sphincsplus/00/ for details
* ASN.1 Encoding for a
* SphincsPlus private key for fully populated:
* <pre>
* SPHINCSPLUSPrivateKey ::= SEQUENCE {
* version INTEGER {v2(1)} --syntax version 2 (round 3)
* skseed OCTET STRING, --n-byte private key seed
* skprf OCTET STRING, --n-byte private key seed
* PublicKey SPHINCSPLUSPublicKey --public key
* }
* </pre>
*/
public sealed class SphincsPlusPrivateKey
: Asn1Encodable
{
public static SphincsPlusPrivateKey GetInstance(object obj)
{
if (obj == null)
return null;
if (obj is SphincsPlusPrivateKey sphincsPlusPrivateKey)
return sphincsPlusPrivateKey;
return new SphincsPlusPrivateKey(Asn1Sequence.GetInstance(obj));
}
public static SphincsPlusPrivateKey GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
return GetInstance(Asn1Sequence.GetInstance(taggedObject, declaredExplicit));
}
public SphincsPlusPrivateKey(int version, byte[] skseed, byte[] skprf)
: this(version, skseed, skprf, null)
{
}
public SphincsPlusPrivateKey(int version, byte[] skseed, byte[] skprf, SphincsPlusPublicKey publicKey)
{
m_version = version;
m_skseed = skseed;
m_skprf = skprf;
m_publicKey = publicKey;
}
private SphincsPlusPrivateKey(Asn1Sequence seq)
{
m_version = DerInteger.GetInstance(seq[0]).IntValueExact;
if (m_version != 0)
throw new ArgumentException("unrecognized version");
m_skseed = Arrays.Clone(Asn1OctetString.GetInstance(seq[1]).GetOctets());
m_skprf = Arrays.Clone(Asn1OctetString.GetInstance(seq[2]).GetOctets());
if (seq.Count == 4)
{
m_publicKey = SphincsPlusPublicKey.GetInstance(seq[3]);
}
}
private readonly int m_version;
private readonly byte[] m_skseed;
private readonly byte[] m_skprf;
private readonly SphincsPlusPublicKey m_publicKey;
public byte[] GetSkprf() => Arrays.Clone(m_skprf);
public byte[] GetSkseed() => Arrays.Clone(m_skseed);
public SphincsPlusPublicKey PublicKey => m_publicKey;
public int Version => m_version;
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector(4);
v.Add(new DerInteger(m_version));
v.Add(new DerOctetString(m_skseed));
v.Add(new DerOctetString(m_skprf));
if (m_publicKey != null)
{
v.Add(new SphincsPlusPublicKey(m_publicKey.GetPkseed(), m_publicKey.GetPkroot()));
}
return new DerSequence(v);
}
}
}
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