using System; using System.IO; namespace Org.BouncyCastle.Tls { public sealed class KeyShareEntry { private readonly int m_namedGroup; private readonly byte[] m_keyExchange; public int NamedGroup => m_namedGroup; public byte[] KeyExchange => m_keyExchange; private static bool CheckKeyExchangeLength(int length) { if (0 < length) return length < 65536; return false; } public KeyShareEntry(int namedGroup, byte[] keyExchange) { if (!TlsUtilities.IsValidUint16(namedGroup)) throw new ArgumentException("should be a uint16", "namedGroup"); if (keyExchange == null) throw new ArgumentNullException("keyExchange"); if (!CheckKeyExchangeLength(keyExchange.Length)) throw new ArgumentException("must have length from 1 to (2^16 - 1)", "keyExchange"); m_namedGroup = namedGroup; m_keyExchange = keyExchange; } public void Encode(Stream output) { TlsUtilities.WriteUint16(NamedGroup, output); TlsUtilities.WriteOpaque16(KeyExchange, output); } public static KeyShareEntry Parse(Stream input) { int namedGroup = TlsUtilities.ReadUint16(input); byte[] keyExchange = TlsUtilities.ReadOpaque16(input, 1); return new KeyShareEntry(namedGroup, keyExchange); } } }