Berry Schoenmakers <[email protected]> added the comment:
In pure Python this seems to be the better option to compute inverses:
def modinv(a, m): # assuming m > 0
b = m
s, s1 = 1, 0
while b:
a, (q, b) = b, divmod(a, b)
s, s1 = s1, s - q * s1
if a != 1:
raise ValueError('inverse does not exist')
return s if s >= 0 else s + m
Binary xgcd algorithms coded in pure Python run much slower.
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<https://bugs.python.org/issue36027>
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