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93.75
/src/fuzzer/ressol.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/numthry.h>










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#include <botan/reducer.h>










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




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   {










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   // Ressol is mostly used for ECC point decompression so best to test smaller sizes










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   static const size_t p_bits = 256;




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   static const Botan::BigInt p = random_prime(fuzzer_rng(), p_bits);




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   static const Botan::Modular_Reducer mod_p(p);




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   if(len > p_bits / 8)




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      return;










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   try




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      {










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      const Botan::BigInt a = Botan::BigInt::decode(in, len);




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      Botan::BigInt a_sqrt = Botan::sqrt_modulo_prime(a, p);




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      if(a_sqrt > 0)




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         {










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         const Botan::BigInt a_redc = mod_p.reduce(a);




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         const Botan::BigInt z = mod_p.square(a_sqrt);




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         if(z != a_redc)




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            {










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            FUZZER_WRITE_AND_CRASH("A = " << a << "\n"




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                                   << "P = " << p << "\n"










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                                   << "R = " << a_sqrt << "\n"










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                                   << "Z = " << z << "\n");










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            }










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         }




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      }




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   catch(Botan::Exception& e) {}




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   return;










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   }










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