Bitwise operations and md4digest function

[Sean Shao]

Alejandro, if you are using Rev 2.5.x or lower, Rev can't do any math with 
numbers larger than 0xFFFFFFF (7 F's) Rev 2.6 and greater can (I don't know 
the limits as I only needed 0xFFFFFFFF (8 F's))  I'm having similiar 
problems with bit math and am looking at rolling my own..

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