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Validate p in ModularSquareRoot #1255

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Validate p in ModularSquareRoot #1255

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3 changes: 3 additions & 0 deletions nbtheory.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -543,6 +543,9 @@ Integer CRT(const Integer &xp, const Integer &p, const Integer &xq, const Intege

Integer ModularSquareRoot(const Integer &a, const Integer &p)
{
if (!IsPrime(p))
throw InvalidArgument("ModularSquareRoot: p must be a prime");

if (p%4 == 3)
return a_exp_b_mod_c(a, (p+1)/4, p);

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