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add header to witness bin #51

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add header to witness bin #51

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12 changes: 12 additions & 0 deletions c/main.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -118,6 +118,18 @@ void writeOutBin(Circom_CalcWit *ctx, std::string filename) {

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;

u8 buffOut[256];
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