Using gmpy2's mulmod to accelerate the mulmod operation #99
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According to data61#98, the mulmod operation(mulmod(a, b, c) = a * b % c) could be accelerated by using gmpy2.mpz when a, b, and c are very large numbers. The main changes are: * add a mulmod funciton in util.py * use util.mulmod function to wrap the mulmod operation in paillier.py
hardbyte
approved these changes
Apr 18, 2022
| @@ -125,6 +125,7 @@ def raw_encrypt(self, plaintext, r_value=None): | |||
| if self.n - self.max_int <= plaintext < self.n: | |||
| # Very large plaintext, take a sneaky shortcut using inverses | |||
| neg_plaintext = self.n - plaintext # = abs(plaintext - nsquare) | |||
| # avoid using gmpy2's mulmod when a * b < c | |||
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According to #98, the mulmod operation(mulmod(a, b, c) = a * b % c)
could be accelerated by using gmpy2.mpz when a, b, and c
are very large numbers.
The main changes are: