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3 Commits

Author SHA1 Message Date
Pieter Wuille
08d54964e5 Improve bounds checks in modinv modules 
This commit adds functions to verify and compare numbers in signed{30,62} notation,
and uses that to do more extensive bounds checking on various variables in the modinv
code.
 2021-03-11 10:25:22 -08:00
Pieter Wuille
d8a92fcc4c Add extensive comments on the safegcd algorithm and implementation 
This adds a long comment explaining the algorithm and implementation choices by building
it up step by step in Python.

Comments in the code are also reworked/added, with references to the long explanation.
 2021-03-08 09:56:07 -08:00
Peter Dettman
8e415acba2 Add safegcd based modular inverse modules 
Refactored by: Pieter Wuille <pieter@wuille.net>
 2021-03-08 09:56:07 -08:00