redc_p256.cpp - mozsearch

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/*

* (C) 2015,2016 Jack Lloyd

* Botan is released under the Simplified BSD License (see license.txt)

*/

#include "fuzzers.h"

#include <botan/reducer.h>

#include <botan/curve_nistp.h>

void fuzz(const uint8_t in[], size_t len)

   if(len > 2*256/8)

      return;

   static const Botan::BigInt& prime = Botan::prime_p256();

   static const Botan::BigInt prime_2 = prime * prime;

   static Botan::Modular_Reducer prime_redc(prime);

   Botan::BigInt input = Botan::BigInt::decode(in, len);

   if(input < prime_2)

      const Botan::BigInt ref = prime_redc.reduce(input);

      Botan::secure_vector<Botan::word> ws;

      Botan::redc_p256(input, ws);

      FUZZER_ASSERT_EQUAL(ref, input);