5.5.3 clarification

To all,

Regarding the 2 octet checksum (that is encrypted), how do we encrypt:

encrypt (Secret MPI's) + encrypt (2 octet checksum)

or:

encrypt (Secret MPI's + 2 octet checksum)


Also, I am also assuming a 16 bit checksum is:

16 bit checksum = 16 most significant bits (sum of Secret MPI's ASCII 
values MOD 65536)
this also assumes a big endian system.

Clarification on this would be great as 5.5.3 does not specify either of 
the above.
TIA.

Regards


Erron Criddle
Comasp Ltd.
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