# < Summary

Information

Class: | Renci.SshNet.Security.KeyExchangeECCurve25519
Assembly: | Renci.SshNet
File(s): | \home\appveyor\projects\ssh-net\src\Renci.SshNet\Security\KeyExchangeECCurve25519.cs

Line coverage
97%

Covered lines: | 35
Uncovered lines: | 1
Coverable lines: | 36
Total lines: | 111
Line coverage: | 97.2%

Branch coverage
N/A

Covered branches: | 0
Total branches: | 0
Branch coverage: | N/A

Method coverage

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# Metrics

Method | Branch coverage | Cyclomatic complexity | Line coverage
--- | --- | --- | ---
get_Name() | 100% | 1 | 100%
get_HashSize() | 100% | 1 | 0%
Start(...) | 100% | 1 | 100%
Finish() | 100% | 1 | 100%
Hash(...) | 100% | 1 | 100%
Session_KeyExchangeEcdhReplyMessageReceived(...) | 100% | 1 | 100%
HandleServerEcdhReply(...) | 100% | 1 | 100%

# File(s)

## \home\appveyor\projects\ssh-net\src\Renci.SshNet\Security\KeyExchangeECCurve25519.cs

| # | Line |  | Line coverage
--- | --- | --- | --- | ---
|  | `1` |  | `using Renci.SshNet.Abstractions;`
|  | `2` |  | `using Renci.SshNet.Common;`
|  | `3` |  | `using Renci.SshNet.Messages.Transport;`
|  | `4` |  | `using Renci.SshNet.Security.Chaos.NaCl;`
|  | `5` |  | `using Renci.SshNet.Security.Chaos.NaCl.Internal.Ed25519Ref10;`
|  | `6` |  | ``
|  | `7` |  | `namespace Renci.SshNet.Security`
|  | `8` |  | `{`
|  | `9` |  | `internal sealed class KeyExchangeECCurve25519 : KeyExchangeEC`
|  | `10` |  | `{`
|  | `11` |  | `private byte[] _privateKey;`
|  | `12` |  | ``
|  | `13` |  | `/// <summary>`
|  | `14` |  | `/// Gets algorithm name.`
|  | `15` |  | `/// </summary>`
|  | `16` |  | `public override string Name`
|  | `17` |  | `{`
| 3516 | `18` |  | `get { return "curve25519-sha256"; }`
|  | `19` |  | `}`
|  | `20` |  | ``
|  | `21` |  | `/// <summary>`
|  | `22` |  | `/// Gets the size, in bits, of the computed hash code.`
|  | `23` |  | `/// </summary>`
|  | `24` |  | `/// <value>`
|  | `25` |  | `/// The size, in bits, of the computed hash code.`
|  | `26` |  | `/// </value>`
|  | `27` |  | `protected override int HashSize`
|  | `28` |  | `{`
| 0 | `29` |  | `get { return 256; }`
|  | `30` |  | `}`
|  | `31` |  | ``
|  | `32` |  | `/// <summary>`
|  | `33` |  | `/// Starts key exchange algorithm.`
|  | `34` |  | `/// </summary>`
|  | `35` |  | `/// <param name="session">The session.</param>`
|  | `36` |  | `/// <param name="message">Key exchange init message.</param>`
|  | `37` |  | `public override void Start(Session session, KeyExchangeInitMessage message)`
| 1172 | `38` |  | `{`
| 1172 | `39` |  | `base.Start(session, message);`
|  | `40` |  | ``
| 1172 | `41` |  | `Session.RegisterMessage("SSH_MSG_KEX_ECDH_REPLY");`
|  | `42` |  | ``
| 1172 | `43` |  | `Session.KeyExchangeEcdhReplyMessageReceived += Session_KeyExchangeEcdhReplyMessageReceived;`
|  | `44` |  | ``
| 1172 | `45` |  | `var basepoint = new byte[MontgomeryCurve25519.PublicKeySizeInBytes];`
| 1172 | `46` |  | `basepoint[0] = 9;`
|  | `47` |  | ``
| 1172 | `48` |  | `_privateKey = CryptoAbstraction.GenerateRandom(MontgomeryCurve25519.PrivateKeySizeInBytes);`
|  | `49` |  | ``
| 1172 | `50` |  | `_clientExchangeValue = new byte[MontgomeryCurve25519.PublicKeySizeInBytes];`
| 1172 | `51` |  | `MontgomeryOperations.scalarmult(_clientExchangeValue, 0, _privateKey, 0, basepoint, 0);`
|  | `52` |  | ``
| 1172 | `53` |  | `SendMessage(new KeyExchangeEcdhInitMessage(_clientExchangeValue));`
| 1172 | `54` |  | `}`
|  | `55` |  | ``
|  | `56` |  | `/// <summary>`
|  | `57` |  | `/// Finishes key exchange algorithm.`
|  | `58` |  | `/// </summary>`
|  | `59` |  | `public override void Finish()`
| 1172 | `60` |  | `{`
| 1172 | `61` |  | `base.Finish();`
|  | `62` |  | ``
| 1171 | `63` |  | `Session.KeyExchangeEcdhReplyMessageReceived -= Session_KeyExchangeEcdhReplyMessageReceived;`
| 1171 | `64` |  | `}`
|  | `65` |  | ``
|  | `66` |  | `/// <summary>`
|  | `67` |  | `/// Hashes the specified data bytes.`
|  | `68` |  | `/// </summary>`
|  | `69` |  | `/// <param name="hashData">The hash data.</param>`
|  | `70` |  | `/// <returns>`
|  | `71` |  | `/// The hash of the data.`
|  | `72` |  | `/// </returns>`
|  | `73` |  | `protected override byte[] Hash(byte[] hashData)`
| 9375 | `74` |  | `{`
| 9375 | `75` |  | `using (var sha256 = CryptoAbstraction.CreateSHA256())`
| 9375 | `76` |  | `{`
| 9375 | `77` |  | `return sha256.ComputeHash(hashData, 0, hashData.Length);`
|  | `78` |  | `}`
| 9375 | `79` |  | `}`
|  | `80` |  | ``
|  | `81` |  | `private void Session_KeyExchangeEcdhReplyMessageReceived(object sender, MessageEventArgs<KeyExchangeEcdhReplyMes`
| 1172 | `82` |  | `{`
| 1172 | `83` |  | `var message = e.Message;`
|  | `84` |  | ``
|  | `85` |  | `// Unregister message once received`
| 1172 | `86` |  | `Session.UnRegisterMessage("SSH_MSG_KEX_ECDH_REPLY");`
|  | `87` |  | ``
| 1172 | `88` |  | `HandleServerEcdhReply(message.KS, message.QS, message.Signature);`
|  | `89` |  | ``
|  | `90` |  | `// When SSH_MSG_KEXDH_REPLY received key exchange is completed`
| 1172 | `91` |  | `Finish();`
| 1171 | `92` |  | `}`
|  | `93` |  | ``
|  | `94` |  | `/// <summary>`
|  | `95` |  | `/// Handles the server DH reply message.`
|  | `96` |  | `/// </summary>`
|  | `97` |  | `/// <param name="hostKey">The host key.</param>`
|  | `98` |  | `/// <param name="serverExchangeValue">The server exchange value.</param>`
|  | `99` |  | `/// <param name="signature">The signature.</param>`
|  | `100` |  | `private void HandleServerEcdhReply(byte[] hostKey, byte[] serverExchangeValue, byte[] signature)`
| 1172 | `101` |  | `{`
| 1172 | `102` |  | `_serverExchangeValue = serverExchangeValue;`
| 1172 | `103` |  | `_hostKey = hostKey;`
| 1172 | `104` |  | `_signature = signature;`
|  | `105` |  | ``
| 1172 | `106` |  | `var sharedKey = new byte[MontgomeryCurve25519.PublicKeySizeInBytes];`
| 1172 | `107` |  | `MontgomeryOperations.scalarmult(sharedKey, 0, _privateKey, 0, serverExchangeValue, 0);`
| 1172 | `108` |  | `SharedKey = sharedKey.ToBigInteger2().ToByteArray().Reverse();`
| 1172 | `109` |  | `}`
|  | `110` |  | `}`
|  | `111` |  | `}`

# Methods/Properties

get_Name()
get_HashSize()
Start(Renci.SshNet.Session,Renci.SshNet.Messages.Transport.KeyExchangeInitMessage)
Finish()
Hash(System.Byte[])
Session_KeyExchangeEcdhReplyMessageReceived(System.Object,Renci.SshNet.MessageEventArgs`1<Renci.SshNet.Messages.Transport.KeyExchangeEcdhReplyMessage>)
HandleServerEcdhReply(System.Byte[],System.Byte[],System.Byte[])