Performance of modular exponentiation

[Torbjörn Granlund]

    https://gmplib.org/manual/Low_002dlevel-Functions#Low_002dlevel-functions-for-cryptography

  It is not mentioned in the upthread cited algorithms chapter.

Great observation!

Not every GMP algorithm is documented in the manual, and several
algorithms are very tersely described.  We have spent and are likely to
henceforth going to spend the majority of our time on the functionality
aspects of the manual.

For those curious about the used algorithms, the C source code is a
perfect source of information.  That even documents every bug!

-- 
Torbjörn
Please encrypt, key id 0xC8601622