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3.4.5.2 SIGNKEY

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If extended session security is not negotiated (section 2.2.2.5), then no signing keys are available and message signing is not supported.

If extended session security is negotiated, the signing key is a 128-bit value that is calculated as follows from the random session key and the null-terminated ASCII constants shown.

Input:

  • ExportedSessionKey - A randomly generated session key.

  • NegFlg - Defined in section 3.1.1.

  • Mode - An enum that defines the local machine performing the computation.  Mode always takes the value "Client" or "Server".

Output:

  • SignKey - The key used for signing messages.

Functions used:

  • ConcatenationOf(), MD5(), NIL - Defined in section 6.

      
 Define SIGNKEY(NegFlg, ExportedSessionKey, Mode) as
 If (NTLMSSP_NEGOTIATE_EXTENDED_SESSIONSECURITY flag is set in NegFlg) 
      If (Mode equals "Client")
           Set SignKey to MD5(ConcatenationOf(ExportedSessionKey, 
           "session key to client-to-server signing key magic  
           constant"))
      Else
           Set SignKey to MD5(ConcatenationOf(ExportedSessionKey, 
           "session key to server-to-client signing key magic
           constant"))
      Endif
 Else 
      Set  SignKey to NIL
 Endif
 EndDefine