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Fix a_exp_b_mod_c and divide by 0 (GH #604)

pull/605/head
Jeffrey Walton 2018-03-25 19:22:42 -04:00
parent 1efa1a9fc7
commit 874c48a329
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1 changed files with 6 additions and 0 deletions
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6
integer.cpp
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@ -4362,12 +4362,18 @@ Integer Integer::MultiplicativeInverse() const
Integer a_times_b_mod_c(const Integer &x, const Integer& y, const Integer& m) Integer a_times_b_mod_c(const Integer &x, const Integer& y, const Integer& m)
{ {
CRYPTOPP_ASSERT(m != 0); CRYPTOPP_ASSERT(m != 0);
if (m == 0)
throw Integer::DivideByZero();
return x*y%m; return x*y%m;
} }
Integer a_exp_b_mod_c(const Integer &x, const Integer& e, const Integer& m) Integer a_exp_b_mod_c(const Integer &x, const Integer& e, const Integer& m)
{ {
CRYPTOPP_ASSERT(m != 0); CRYPTOPP_ASSERT(m != 0);
if (m == 0)
throw Integer::DivideByZero();
ModularArithmetic mr(m); ModularArithmetic mr(m);
return mr.Exponentiate(x, e); return mr.Exponentiate(x, e);
} }