66 lines
1.5 KiB
C#
66 lines
1.5 KiB
C#
using System;
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using System.IO;
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using Org.BouncyCastle.Math.EC.Rfc7748;
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using Org.BouncyCastle.Security;
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using Org.BouncyCastle.Utilities;
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using Org.BouncyCastle.Utilities.IO;
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namespace Org.BouncyCastle.Crypto.Parameters;
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public sealed class X25519PrivateKeyParameters : AsymmetricKeyParameter
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{
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public static readonly int KeySize = 32;
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public static readonly int SecretSize = 32;
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private readonly byte[] data = new byte[KeySize];
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public X25519PrivateKeyParameters(SecureRandom random)
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: base(privateKey: true)
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{
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X25519.GeneratePrivateKey(random, data);
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}
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public X25519PrivateKeyParameters(byte[] buf, int off)
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: base(privateKey: true)
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{
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Array.Copy(buf, off, data, 0, KeySize);
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}
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public X25519PrivateKeyParameters(Stream input)
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: base(privateKey: true)
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{
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if (KeySize != Streams.ReadFully(input, data))
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{
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throw new EndOfStreamException("EOF encountered in middle of X25519 private key");
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}
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}
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public void Encode(byte[] buf, int off)
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{
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Array.Copy(data, 0, buf, off, KeySize);
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}
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public byte[] GetEncoded()
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{
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return Arrays.Clone(data);
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}
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public X25519PublicKeyParameters GeneratePublicKey()
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{
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byte[] array = new byte[32];
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X25519.GeneratePublicKey(data, 0, array, 0);
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return new X25519PublicKeyParameters(array, 0);
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}
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public void GenerateSecret(X25519PublicKeyParameters publicKey, byte[] buf, int off)
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{
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byte[] array = new byte[32];
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publicKey.Encode(array, 0);
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if (!X25519.CalculateAgreement(data, 0, array, 0, buf, off))
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{
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throw new InvalidOperationException("X25519 agreement failed");
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}
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}
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}
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