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using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Security;
namespace Org.BouncyCastle.Pqc.Crypto.Lms
{
public sealed class LMOtsPrivateKey
{
private readonly LMOtsParameters m_parameters;
private readonly byte[] m_I;
private readonly int m_q;
private readonly byte[] m_masterSecret;
public LMOtsPrivateKey(LMOtsParameters parameters, byte[] i, int q, byte[] masterSecret)
{
m_parameters = parameters;
m_I = i;
m_q = q;
m_masterSecret = masterSecret;
}
public LmsContext GetSignatureContext(LMSigParameters sigParams, byte[][] path)
{
byte[] C = new byte[LMOts.SEED_LEN];
SeedDerive derive = GetDerivationFunction();
derive.J = LMOts.SEED_RANDOMISER_INDEX; // This value from reference impl.
derive.DeriveSeed(false, C, 0);
IDigest ctx = DigestUtilities.GetDigest(m_parameters.DigestOid);
LmsUtilities.ByteArray(m_I, ctx);
LmsUtilities.U32Str(m_q, ctx);
LmsUtilities.U16Str(LMOts.D_MESG, ctx);
LmsUtilities.ByteArray(C, ctx);
return new LmsContext(this, sigParams, ctx, C, path);
}
internal SeedDerive GetDerivationFunction()
{
return new SeedDerive(m_I, m_masterSecret, DigestUtilities.GetDigest(m_parameters.DigestOid))
{
Q = m_q,
J = 0,
};
}
public LMOtsParameters Parameters => m_parameters;
// FIXME
public byte[] I => m_I;
public int Q => m_q;
// FIXME
public byte[] MasterSecret => m_masterSecret;
}
}
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