Change sequence of sending NEW_KEYS message, some servers would hang during key negotiation stage

Renci.SshClient/Renci.SshClient/Security/KeyExchange.cs

@@ -177,13 +177,7 @@ namespace Renci.SshClient.Security
         public virtual void Finish()
         {
             //  Validate hash
-            var validated = this.ValidateExchangeHash();
-
-            if (validated)
-            {
-                this.SendMessage(new NewKeysMessage());
-            }
-            else
+            if (!this.ValidateExchangeHash())
             {
                 throw new SshConnectionException("Key exchange negotiation failed.", DisconnectReasons.KeyExchangeFailed);
             }

Renci.SshClient/Renci.SshClient/Security/KeyExchangeDiffieHellman.cs

@@ -138,6 +138,9 @@ namespace Renci.SshClient.Security
             this._hostKey = hostKey;
             this.SharedKey = System.Numerics.BigInteger.ModPow(serverExchangeValue, this._randomValue, this._prime);
             this._signature = signature;
+
+            //  Whare DH reply received key exchange is completed
+            this.SendMessage(new NewKeysMessage());
         }
     }
 }