Created
August 23, 2018 01:56
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Fast modular exponentiation in Erlang
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| -module(powermod). | |
| -export([powmod/2]). | |
| powmod(A, B, M) -> powmod(A, B, M, 1). | |
| powmod(_, 0, _, R) -> R; | |
| powmod(A, B, M, R) when B rem 2 == 1 -> powmod(A, B-1, M, A*R rem M); | |
| powmod(A, B, M, R) -> powmod(A*A rem M, B div 2, M, R). |
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