Finally, there is a line saying "Private-MAC: " plus a hex representation of a HMAC-SHA-1 of: string name of algorithm ("ssh-dss", "ssh-rsa") string encryption type string comment string public-blob string private-plaintext (the plaintext version of the private part, including the final padding) The key to the MAC is itself a SHA-1 hash of: data "putty-private-key-file-mac-key" data passphrase (An empty passphrase is used for unencrypted keys.)

'Declaration
 
Protected Function VerifyPrivateMac( _
   ByVal targetMac As String, _
   ByVal passphrase() As Byte _
) As Boolean

'Usage
 
Dim instance As PuTTYPrivateKeyFile
Dim targetMac As String
Dim passphrase() As Byte
Dim value As Boolean
 
value = instance.VerifyPrivateMac(targetMac, passphrase)

protected bool VerifyPrivateMac( 
   string targetMac,
   byte[] passphrase
)