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add header to witness bin

feature/witness_bin
krlosMata 4 years ago
parent
commit
babe908d35
1 changed files with 12 additions and 0 deletions
  1. +12
    -0
      c/main.cpp

+ 12
- 0
c/main.cpp

@ -118,6 +118,18 @@ void writeOutBin(Circom_CalcWit *ctx, std::string filename) {
write_ptr = fopen(filename.c_str(),"wb"); write_ptr = fopen(filename.c_str(),"wb");
// Add header
// 4 bytes --> total number of constraints
uint32_t witnessLength = _circuit.NVars;
// 4 bytes --> witness element size (measured in number of 32bit words)
uint32_t witnessSize = 8; // witness size = 8*32 = 256 bits
// 8bytes --> empty
uint64_t otherField = 0;
fwrite(&witnessLength, 4, 1, write_ptr);
fwrite(&witnessSize, 4, 1, write_ptr);
fwrite(&otherField, 8, 1, write_ptr);
FrElement v; FrElement v;
u8 buffOut[256]; u8 buffOut[256];

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