init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Bcpg/MPInteger.cs

@@ -0,0 +1,48 @@
+using System;
+using Org.BouncyCastle.Math;
+
+namespace Org.BouncyCastle.Bcpg;
+
+public class MPInteger : BcpgObject
+{
+	private readonly BigInteger val;
+
+	public BigInteger Value => val;
+
+	public MPInteger(BcpgInputStream bcpgIn)
+	{
+		if (bcpgIn == null)
+		{
+			throw new ArgumentNullException("bcpgIn");
+		}
+		int num = (bcpgIn.ReadByte() << 8) | bcpgIn.ReadByte();
+		byte[] array = new byte[(num + 7) / 8];
+		bcpgIn.ReadFully(array);
+		val = new BigInteger(1, array);
+	}
+
+	public MPInteger(BigInteger val)
+	{
+		if (val == null)
+		{
+			throw new ArgumentNullException("val");
+		}
+		if (val.SignValue < 0)
+		{
+			throw new ArgumentException("Values must be positive", "val");
+		}
+		this.val = val;
+	}
+
+	public override void Encode(BcpgOutputStream bcpgOut)
+	{
+		bcpgOut.WriteShort((short)val.BitLength);
+		bcpgOut.Write(val.ToByteArrayUnsigned());
+	}
+
+	internal static void Encode(BcpgOutputStream bcpgOut, BigInteger val)
+	{
+		bcpgOut.WriteShort((short)val.BitLength);
+		bcpgOut.Write(val.ToByteArrayUnsigned());
+	}
+}