I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#ifndef ELLIGATOR_H__
#define ELLIGATOR_H__
#include <inttypes.h>
#include <memory>
#include <openssl/bn.h>
namespace i2p
{
namespace crypto
{
class Elligator2
{
public:
Elligator2 ();
~Elligator2 ();
bool Encode (const uint8_t * key, uint8_t * encoded, bool highY = false, bool random = true) const;
bool Decode (const uint8_t * encoded, uint8_t * key) const;
private:
void SquareRoot (const BIGNUM * x, BIGNUM * r, BN_CTX * ctx) const;
int Legendre (const BIGNUM * a, BN_CTX * ctx) const; // a/p
private:
BIGNUM * p, * p38, * p12, * p14, * sqrtn1, * A, * nA, * u, * iu;
};
std::unique_ptr<Elligator2>& GetElligator ();
}
}
#endif