| | | 1 | | using Renci.SshNet.Common; |
| | | 2 | | using Renci.SshNet.Messages.Transport; |
| | | 3 | | |
| | | 4 | | namespace Renci.SshNet.Security |
| | | 5 | | { |
| | | 6 | | internal abstract class KeyExchangeDiffieHellmanGroupShaBase : KeyExchangeDiffieHellman |
| | | 7 | | { |
| | | 8 | | /// <summary> |
| | | 9 | | /// Gets the group prime. |
| | | 10 | | /// </summary> |
| | | 11 | | /// <value> |
| | | 12 | | /// The group prime. |
| | | 13 | | /// </value> |
| | | 14 | | public abstract BigInteger GroupPrime { get; } |
| | | 15 | | |
| | | 16 | | /// <summary> |
| | | 17 | | /// Starts key exchange algorithm. |
| | | 18 | | /// </summary> |
| | | 19 | | /// <param name="session">The session.</param> |
| | | 20 | | /// <param name="message">Key exchange init message.</param> |
| | | 21 | | public override void Start(Session session, KeyExchangeInitMessage message) |
| | 12 | 22 | | { |
| | 12 | 23 | | base.Start(session, message); |
| | | 24 | | |
| | 12 | 25 | | Session.RegisterMessage("SSH_MSG_KEXDH_REPLY"); |
| | | 26 | | |
| | 12 | 27 | | Session.KeyExchangeDhReplyMessageReceived += Session_KeyExchangeDhReplyMessageReceived; |
| | | 28 | | |
| | 12 | 29 | | _prime = GroupPrime; |
| | 12 | 30 | | _group = new BigInteger(new byte[] { 2 }); |
| | | 31 | | |
| | 12 | 32 | | PopulateClientExchangeValue(); |
| | | 33 | | |
| | 12 | 34 | | SendMessage(new KeyExchangeDhInitMessage(_clientExchangeValue)); |
| | 12 | 35 | | } |
| | | 36 | | |
| | | 37 | | /// <summary> |
| | | 38 | | /// Finishes key exchange algorithm. |
| | | 39 | | /// </summary> |
| | | 40 | | public override void Finish() |
| | 12 | 41 | | { |
| | 12 | 42 | | base.Finish(); |
| | | 43 | | |
| | 12 | 44 | | Session.KeyExchangeDhReplyMessageReceived -= Session_KeyExchangeDhReplyMessageReceived; |
| | 12 | 45 | | } |
| | | 46 | | |
| | | 47 | | /// <summary> |
| | | 48 | | /// Calculates key exchange hash value. |
| | | 49 | | /// </summary> |
| | | 50 | | /// <returns> |
| | | 51 | | /// Key exchange hash. |
| | | 52 | | /// </returns> |
| | | 53 | | protected override byte[] CalculateHash() |
| | 24 | 54 | | { |
| | 24 | 55 | | var keyExchangeHashData = new KeyExchangeHashData |
| | 24 | 56 | | { |
| | 24 | 57 | | ClientVersion = Session.ClientVersion, |
| | 24 | 58 | | ServerVersion = Session.ServerVersion, |
| | 24 | 59 | | ClientPayload = _clientPayload, |
| | 24 | 60 | | ServerPayload = _serverPayload, |
| | 24 | 61 | | HostKey = _hostKey, |
| | 24 | 62 | | ClientExchangeValue = _clientExchangeValue, |
| | 24 | 63 | | ServerExchangeValue = _serverExchangeValue, |
| | 24 | 64 | | SharedKey = SharedKey, |
| | 24 | 65 | | }; |
| | | 66 | | |
| | 24 | 67 | | return Hash(keyExchangeHashData.GetBytes()); |
| | 24 | 68 | | } |
| | | 69 | | |
| | | 70 | | private void Session_KeyExchangeDhReplyMessageReceived(object sender, MessageEventArgs<KeyExchangeDhReplyMessage |
| | 12 | 71 | | { |
| | 12 | 72 | | var message = e.Message; |
| | | 73 | | |
| | | 74 | | // Unregister message once received |
| | 12 | 75 | | Session.UnRegisterMessage("SSH_MSG_KEXDH_REPLY"); |
| | | 76 | | |
| | 12 | 77 | | HandleServerDhReply(message.HostKey, message.F, message.Signature); |
| | | 78 | | |
| | | 79 | | // When SSH_MSG_KEXDH_REPLY received key exchange is completed |
| | 12 | 80 | | Finish(); |
| | 12 | 81 | | } |
| | | 82 | | } |
| | | 83 | | } |