using System.Numerics;

namespace Renci.SshNet.Security
{
    /// <summary>
    /// Represents "diffie-hellman-group1-sha1" algorithm implementation.
    /// </summary>
    internal sealed class KeyExchangeDiffieHellmanGroup1Sha1 : KeyExchangeDiffieHellmanGroupSha1
    {
        private static readonly BigInteger SecondOkleyGroupReversed = new BigInteger(
        [
            0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x81, 0x53, 0xe6, 0xec,
            0x51, 0x66, 0x28, 0x49, 0xe6, 0x1f, 0x4b, 0x7c, 0x11, 0x24, 0x9f, 0xae,
            0xa5, 0x9f, 0x89, 0x5a, 0xfb, 0x6b, 0x38, 0xee, 0xed, 0xb7, 0x06, 0xf4,
            0xb6, 0x5c, 0xff, 0x0b, 0x6b, 0xed, 0x37, 0xa6, 0xe9, 0x42, 0x4c, 0xf4,
            0xc6, 0x7e, 0x5e, 0x62, 0x76, 0xb5, 0x85, 0xe4, 0x45, 0xc2, 0x51, 0x6d,
            0x6d, 0x35, 0xe1, 0x4f, 0x37, 0x14, 0x5f, 0xf2, 0x6d, 0x0a, 0x2b, 0x30,
            0x1b, 0x43, 0x3a, 0xcd, 0xb3, 0x19, 0x95, 0xef, 0xdd, 0x04, 0x34, 0x8e,
            0x79, 0x08, 0x4a, 0x51, 0x22, 0x9b, 0x13, 0x3b, 0xa6, 0xbe, 0x0b, 0x02,
            0x74, 0xcc, 0x67, 0x8a, 0x08, 0x4e, 0x02, 0x29, 0xd1, 0x1c, 0xdc, 0x80,
            0x8b, 0x62, 0xc6, 0xc4, 0x34, 0xc2, 0x68, 0x21, 0xa2, 0xda, 0x0f, 0xc9,
            0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
            0x00
        ]);

        /// <summary>
        /// Gets algorithm name.
        /// </summary>
        public override string Name
        {
            get { return "diffie-hellman-group1-sha1"; }
        }

        /// <summary>
        /// Gets the group prime.
        /// </summary>
        /// <value>
        /// The group prime.
        /// </value>
        public override BigInteger GroupPrime
        {
            get
            {
                return SecondOkleyGroupReversed;
            }
        }
    }
}
