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using System;
using System.IO;
using Org.BouncyCastle.Crypto.Utilities;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Bcpg
{
/// <remarks>Basic type for a PGP Signature sub-packet.</remarks>
public class SignatureSubpacket
{
private readonly SignatureSubpacketTag type;
private readonly bool critical;
private readonly bool isLongLength;
internal byte[] data;
protected internal SignatureSubpacket(
SignatureSubpacketTag type,
bool critical,
bool isLongLength,
byte[] data)
{
this.type = type;
this.critical = critical;
this.isLongLength = isLongLength;
this.data = data;
}
public SignatureSubpacketTag SubpacketType
{
get { return type; }
}
public bool IsCritical()
{
return critical;
}
public bool IsLongLength()
{
return isLongLength;
}
/// <summary>Return the generic data making up the packet.</summary>
public byte[] GetData()
{
return (byte[])data.Clone();
}
public void Encode(
Stream os)
{
int bodyLen = data.Length + 1;
if (isLongLength || bodyLen > 8383)
{
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
Span<byte> buf = stackalloc byte[5];
buf[0] = 0xFF;
Pack.UInt32_To_BE((uint)bodyLen, buf, 1);
os.Write(buf);
#else
os.WriteByte(0xff);
os.WriteByte((byte)(bodyLen >> 24));
os.WriteByte((byte)(bodyLen >> 16));
os.WriteByte((byte)(bodyLen >> 8));
os.WriteByte((byte)bodyLen);
#endif
}
else if (bodyLen < 192)
{
os.WriteByte((byte)bodyLen);
}
else
{
bodyLen -= 192;
os.WriteByte((byte)(((bodyLen >> 8) & 0xff) + 192));
os.WriteByte((byte)bodyLen);
}
if (critical)
{
os.WriteByte((byte)(0x80 | (int) type));
}
else
{
os.WriteByte((byte) type);
}
os.Write(data, 0, data.Length);
}
public override int GetHashCode()
{
return (critical ? 1 : 0) + 7 * (int)type + 49 * Arrays.GetHashCode(data);
}
public override bool Equals(object obj)
{
if (obj == this)
return true;
if (!(obj is SignatureSubpacket other))
return false;
return this.type == other.type
&& this.critical == other.critical
&& Arrays.AreEqual(this.data, other.data);
}
}
}
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