RFC4253: 7.3. Taking Keys Into Use Key exchange ends by each side sending an SSH_MSG_NEWKEYS message. This message is sent with the old keys and algorithms. All messages sent after this message MUST use the new keys and algorithms. When this message is received, the new keys and algorithms MUST be used for receiving. The purpose of this message is to ensure that a party is able to respond with an SSH_MSG_DISCONNECT message that the other party can understand if something goes wrong with the key exchange.

'Declaration
 
Public Sub UseNewKeysServerToClient( _
   ByVal sharedSecret() As Byte, _
   ByVal exchangeHash() As Byte, _
   ByVal keyExchangeAlgorithm As ISSHKeyExchangeAlgorithm, _
   ByVal encryptionAlgorithm As ISSHEncryptionAlgorithm, _
   ByVal dataIntegrityAlgorithm As ISSHDataIntegrityAlgorithm, _
   ByVal compressionAlgorithm As ISSHCompressionAlgorithm, _
   ByVal iv() As Byte, _
   ByVal encryptionKey() As Byte, _
   ByVal integrityKey() As Byte _
) 

'Usage
 
Dim instance As SSHTransportLayerProtocol
Dim sharedSecret() As Byte
Dim exchangeHash() As Byte
Dim keyExchangeAlgorithm As ISSHKeyExchangeAlgorithm
Dim encryptionAlgorithm As ISSHEncryptionAlgorithm
Dim dataIntegrityAlgorithm As ISSHDataIntegrityAlgorithm
Dim compressionAlgorithm As ISSHCompressionAlgorithm
Dim iv() As Byte
Dim encryptionKey() As Byte
Dim integrityKey() As Byte
 
instance.UseNewKeysServerToClient(sharedSecret, exchangeHash, keyExchangeAlgorithm, encryptionAlgorithm, dataIntegrityAlgorithm, compressionAlgorithm, iv, encryptionKey, integrityKey)

public void UseNewKeysServerToClient( 
   byte[] sharedSecret,
   byte[] exchangeHash,
   ISSHKeyExchangeAlgorithm keyExchangeAlgorithm,
   ISSHEncryptionAlgorithm encryptionAlgorithm,
   ISSHDataIntegrityAlgorithm dataIntegrityAlgorithm,
   ISSHCompressionAlgorithm compressionAlgorithm,
   byte[] iv,
   byte[] encryptionKey,
   byte[] integrityKey
)