Coverage Report

Created: 2021-05-04 09:02

/src/botan/src/fuzzer/redc_p256.cpp
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/*
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* (C) 2015,2016 Jack Lloyd
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*
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* Botan is released under the Simplified BSD License (see license.txt)
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*/
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#include "fuzzers.h"
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#include <botan/reducer.h>
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#include <botan/internal/curve_nistp.h>
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void fuzz(const uint8_t in[], size_t len)
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   {
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   if(len > 2*256/8)
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      return;
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   static const Botan::BigInt& prime = Botan::prime_p256();
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   static const Botan::BigInt prime_2 = prime * prime;
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   static Botan::Modular_Reducer prime_redc(prime);
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   Botan::BigInt input = Botan::BigInt::decode(in, len);
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   if(input < prime_2)
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      {
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      const Botan::BigInt ref = prime_redc.reduce(input);
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      Botan::secure_vector<Botan::word> ws;
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      Botan::redc_p256(input, ws);
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      FUZZER_ASSERT_EQUAL(ref, input);
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      }
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   }