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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 LMOtsSignature
: IEncodable
{
private LMOtsParameters ParamType;
private byte[] C;
private byte[] y;
public LMOtsSignature(LMOtsParameters ParamType, byte[] c, byte[] y)
{
this.ParamType = ParamType;
C = c;
this.y = y;
}
public static LMOtsSignature GetInstance(Object src)
{
if (src is LMOtsSignature)
{
return (LMOtsSignature)src;
}
//TODO replace inputstreams with something
else if (src is BinaryReader)
{
byte[] data = ((BinaryReader) src).ReadBytes(4);
Array.Reverse(data);
int index = BitConverter.ToInt32(data, 0);
LMOtsParameters type = LMOtsParameters.GetParametersForType(index);
byte[] C = new byte[type.GetN()];
((BinaryReader)src).Read(C, 0, C.Length);
byte[] sig = new byte[type.GetP()*type.GetN()];
((BinaryReader)src).Read(sig, 0, sig.Length);
return new LMOtsSignature(type, C, sig);
}
else if (src is byte[])
{
BinaryReader input = null;
try // 1.5 / 1.4 compatibility
{
input = new BinaryReader(new MemoryStream((byte[])src, false));
return GetInstance(input);
}
finally
{
if (input != null) input.Close();
}
}
else if (src is MemoryStream)
{
return GetInstance(Streams.ReadAll((Stream)src));
}
throw new Exception ($"cannot parse {src}");
}
public LMOtsParameters GetParamType()
{
return ParamType;
}
public byte[] GetC()
{
return C;
}
public byte[] GetY()
{
return y;
}
public bool Equals(Object o)
{
if (this == o)
{
return true;
}
if (o == null || GetType() != o.GetType())
{
return false;
}
LMOtsSignature that = (LMOtsSignature)o;
if (ParamType != null ? !ParamType.Equals(that.ParamType) : that.ParamType != null)
{
return false;
}
if (!Arrays.AreEqual(C, that.C))
{
return false;
}
return Arrays.AreEqual(y, that.y);
}
public override int GetHashCode()
{
int result = ParamType != null ? ParamType.GetHashCode() : 0;
result = 31 * result + Arrays.GetHashCode(C);
result = 31 * result + Arrays.GetHashCode(y);
return result;
}
public byte[] GetEncoded()
{
return Composer.Compose()
.U32Str(ParamType.GetType())
.Bytes(C)
.Bytes(y)
.Build();
}
}
}
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