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using System;
using System.IO;
using Org.BouncyCastle.Utilities;
using Org.BouncyCastle.Utilities.IO;
namespace Org.BouncyCastle.Pqc.Crypto.Lms
{
public class LMSPublicKeyParameters
: LMSKeyParameters, ILMSContextBasedVerifier
{
private LMSigParameters parameterSet;
private LMOtsParameters lmOtsType;
private byte[] I;
private byte[] T1;
public LMSPublicKeyParameters(LMSigParameters parameterSet, LMOtsParameters lmOtsType, byte[] T1, byte[] I)
: base(false)
{
this.parameterSet = parameterSet;
this.lmOtsType = lmOtsType;
this.I = Arrays.Clone(I);
this.T1 = Arrays.Clone(T1);
}
public static LMSPublicKeyParameters GetInstance(object src)
{
if (src is LMSPublicKeyParameters lmsPublicKeyParameters)
{
return lmsPublicKeyParameters;
}
else if (src is BinaryReader binaryReader)
{
int pubType = BinaryReaders.ReadInt32BigEndian(binaryReader);
LMSigParameters lmsParameter = LMSigParameters.GetParametersByID(pubType);
int index = BinaryReaders.ReadInt32BigEndian(binaryReader);
LMOtsParameters ostTypeCode = LMOtsParameters.GetParametersByID(index);
byte[] I = BinaryReaders.ReadBytesFully(binaryReader, 16);
byte[] T1 = BinaryReaders.ReadBytesFully(binaryReader, lmsParameter.M);
return new LMSPublicKeyParameters(lmsParameter, ostTypeCode, T1, I);
}
else if (src is byte[] bytes)
{
BinaryReader input = null;
try // 1.5 / 1.6 compatibility
{
input = new BinaryReader(new MemoryStream(bytes, false));
return GetInstance(input);
}
finally
{
if (input != null)
{
input.Close();
}
}
}
else if (src is MemoryStream memoryStream)
{
return GetInstance(Streams.ReadAll(memoryStream));
}
throw new Exception ($"cannot parse {src}");
}
public override byte[] GetEncoded()
{
return this.ToByteArray();
}
public LMSigParameters GetSigParameters()
{
return parameterSet;
}
public LMOtsParameters GetOtsParameters()
{
return lmOtsType;
}
public LMSParameters GetLmsParameters()
{
return new LMSParameters(this.GetSigParameters(), this.GetOtsParameters());
}
public byte[] GetT1()
{
return Arrays.Clone(T1);
}
internal bool MatchesT1(byte[] sig)
{
return Arrays.ConstantTimeAreEqual(T1, sig);
}
public byte[] GetI()
{
return Arrays.Clone(I);
}
byte[] RefI()
{
return I;
}
public override bool Equals(Object o)
{
if (this == o)
{
return true;
}
if (o == null || GetType() != o.GetType())
{
return false;
}
LMSPublicKeyParameters publicKey = (LMSPublicKeyParameters)o;
if (!parameterSet.Equals(publicKey.parameterSet))
{
return false;
}
if (!lmOtsType.Equals(publicKey.lmOtsType))
{
return false;
}
if (!Arrays.AreEqual(I, publicKey.I))
{
return false;
}
return Arrays.AreEqual(T1, publicKey.T1);
}
public override int GetHashCode()
{
int result = parameterSet.GetHashCode();
result = 31 * result + lmOtsType.GetHashCode();
result = 31 * result + Arrays.GetHashCode(I);
result = 31 * result + Arrays.GetHashCode(T1);
return result;
}
internal byte[] ToByteArray()
{
return Composer.Compose()
.U32Str(parameterSet.ID)
.U32Str(lmOtsType.ID)
.Bytes(I)
.Bytes(T1)
.Build();
}
public LMSContext GenerateLmsContext(byte[] signature)
{
try
{
return GenerateOtsContext(LMSSignature.GetInstance(signature));
}
catch (IOException e)
{
throw new IOException($"cannot parse signature: {e.Message}");
}
}
internal LMSContext GenerateOtsContext(LMSSignature S)
{
int ots_typecode = GetOtsParameters().ID;
if (S.OtsSignature.ParamType.ID != ots_typecode)
{
throw new ArgumentException("ots type from lsm signature does not match ots" +
" signature type from embedded ots signature");
}
return new LMOtsPublicKey(LMOtsParameters.GetParametersByID(ots_typecode), I, S.Q, null)
.CreateOtsContext(S);
}
public bool Verify(LMSContext context)
{
return LMS.VerifySignature(this, context);
}
}
}
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