Andy Vo voandy
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| import Data.Bits | |
| modExp :: Integer -> Integer -> Integer -> Integer | |
| modExp b 0 m = 1 | |
| modExp b e m = t * modExp ((b * b) `mod` m) (shiftR e 1) m `mod` m | |
| where t = if testBit e 0 then b `mod` m else 1 |