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using System;
using System.IO;
using Org.BouncyCastle.Utilities.IO;
namespace Org.BouncyCastle.Pqc.Crypto.Lms
{
public sealed class HssPublicKeyParameters
: LmsKeyParameters, ILmsContextBasedVerifier
{
private readonly int m_l;
private readonly LmsPublicKeyParameters m_lmsPublicKey;
public HssPublicKeyParameters(int l, LmsPublicKeyParameters lmsPublicKey)
:base(false)
{
m_l = l;
m_lmsPublicKey = lmsPublicKey;
}
public static HssPublicKeyParameters GetInstance(object src)
{
if (src is HssPublicKeyParameters hssPublicKeyParameters)
{
return hssPublicKeyParameters;
}
else if (src is BinaryReader binaryReader)
{
int L = BinaryReaders.ReadInt32BigEndian(binaryReader);
LmsPublicKeyParameters lmsPublicKey = LmsPublicKeyParameters.GetInstance(src);
return new HssPublicKeyParameters(L, lmsPublicKey);
}
else if (src is byte[] bytes)
{
BinaryReader input = null;
try // 1.5 / 1.6 compatibility
{
input = new BinaryReader(new MemoryStream(bytes));
return GetInstance(input);
}
finally
{
if (input != null) input.Close();
}
}
else if (src is MemoryStream memoryStream)
{
return GetInstance(Streams.ReadAll(memoryStream));
}
throw new ArgumentException($"cannot parse {src}");
}
public int L => m_l;
public LmsPublicKeyParameters LmsPublicKey => m_lmsPublicKey;
public override bool Equals(Object o)
{
if (this == o)
return true;
if (o == null || GetType() != o.GetType())
return false;
HssPublicKeyParameters publicKey = (HssPublicKeyParameters)o;
return m_l == publicKey.m_l
&& m_lmsPublicKey.Equals(publicKey.m_lmsPublicKey);
}
public override int GetHashCode()
{
int result = m_l;
result = 31 * result + m_lmsPublicKey.GetHashCode();
return result;
}
public override byte[] GetEncoded()
{
return Composer.Compose().U32Str(m_l)
.Bytes(m_lmsPublicKey.GetEncoded())
.Build();
}
public LmsContext GenerateLmsContext(byte[] sigEnc)
{
HssSignature signature;
try
{
signature = HssSignature.GetInstance(sigEnc, L);
}
catch (IOException e)
{
throw new Exception($"cannot parse signature: {e.Message}");
}
LmsSignedPubKey[] signedPubKeys = signature.GetSignedPubKeys();
LmsPublicKeyParameters key = LmsPublicKey;
if (signedPubKeys.Length != 0)
{
key = signedPubKeys[signedPubKeys.Length - 1].GetPublicKey();
}
return key.GenerateOtsContext(signature.Signature).WithSignedPublicKeys(signedPubKeys);
}
public bool Verify(LmsContext context)
{
LmsSignedPubKey[] sigKeys = context.SignedPubKeys;
if (sigKeys.Length != L - 1)
return false;
LmsPublicKeyParameters key = LmsPublicKey;
bool failed = false;
for (int i = 0; i < sigKeys.Length; i++)
{
LmsSignature sig = sigKeys[i].GetSignature();
byte[] msg = sigKeys[i].GetPublicKey().ToByteArray();
if (!Lms.VerifySignature(key, sig, msg))
{
failed = true;
}
key = sigKeys[i].GetPublicKey();
}
return !failed & key.Verify(context);
}
}
}
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