init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Crypto/Parameters/X448PrivateKeyParameters.cs

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+using System;
+using System.IO;
+using Org.BouncyCastle.Math.EC.Rfc7748;
+using Org.BouncyCastle.Security;
+using Org.BouncyCastle.Utilities;
+using Org.BouncyCastle.Utilities.IO;
+
+namespace Org.BouncyCastle.Crypto.Parameters;
+
+public sealed class X448PrivateKeyParameters : AsymmetricKeyParameter
+{
+	public static readonly int KeySize = 56;
+
+	public static readonly int SecretSize = 56;
+
+	private readonly byte[] data = new byte[KeySize];
+
+	public X448PrivateKeyParameters(SecureRandom random)
+		: base(privateKey: true)
+	{
+		X448.GeneratePrivateKey(random, data);
+	}
+
+	public X448PrivateKeyParameters(byte[] buf, int off)
+		: base(privateKey: true)
+	{
+		Array.Copy(buf, off, data, 0, KeySize);
+	}
+
+	public X448PrivateKeyParameters(Stream input)
+		: base(privateKey: true)
+	{
+		if (KeySize != Streams.ReadFully(input, data))
+		{
+			throw new EndOfStreamException("EOF encountered in middle of X448 private key");
+		}
+	}
+
+	public void Encode(byte[] buf, int off)
+	{
+		Array.Copy(data, 0, buf, off, KeySize);
+	}
+
+	public byte[] GetEncoded()
+	{
+		return Arrays.Clone(data);
+	}
+
+	public X448PublicKeyParameters GeneratePublicKey()
+	{
+		byte[] array = new byte[56];
+		X448.GeneratePublicKey(data, 0, array, 0);
+		return new X448PublicKeyParameters(array, 0);
+	}
+
+	public void GenerateSecret(X448PublicKeyParameters publicKey, byte[] buf, int off)
+	{
+		byte[] array = new byte[56];
+		publicKey.Encode(array, 0);
+		if (!X448.CalculateAgreement(data, 0, array, 0, buf, off))
+		{
+			throw new InvalidOperationException("X448 agreement failed");
+		}
+	}
+}