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polynomial squaring

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This commit is contained in:
Mirek Kratochvil 2012-04-02 19:16:32 +02:00
parent 575cdca736
commit ec5b6c36b1
2 changed files with 18 additions and 1 deletions
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2
include/codecrypt.h
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@ -100,7 +100,7 @@ public:
polynomial gcd (polynomial); polynomial gcd (polynomial);
bool is_irreducible(); bool is_irreducible();
void generate_random_irreducible (uint n, prng&); void generate_random_irreducible (uint n, prng&);
vector operator<< (uint); void compute_mod_squaring_matrix (matrix&);
}; };
/* /*

17
lib/polynomial.cpp
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@ -118,3 +118,20 @@ void polynomial::generate_random_irreducible (uint s, prng & rng)
} }
} }
void polynomial::compute_mod_squaring_matrix (matrix&r)
{
int d = degree();
if (d < 0) return;
r.resize (d);
polynomial col, t;
for (int i = 0; i < d; ++i) {
col.clear();
col.resize (i + 1, 0);
col[i] = 1;
t = col;
col.mult (t);
col.mod (*this);
col.resize (d, 0);
r[i] = col;
}
}