Consensys/gnark-crypto

How to call mimc to input a string and output the mimc hashed result?

fengyin450 opened this issue · 1 comments

fengyin450 commented

In the example of https://play.gnark.io/#, it can be seen that the hash result of "Secret": "0xdeadf00d" is "Hash": "1037254799353855871006189384309576393135431139055333626960622147300727 796413", how to call https://github.com/Consensys/gnark-crypto/blob/master/ecc/bn254/fr/mimc/mimc.go can input Secret to get Hash by implementing mimc function? I tried many methods, but the output is 0 or wrong result. The following is one of them:


func mimcHash(data []byte) string {

	f := bn254.NewMiMC()

	f.Write(data)

	hash := f.Sum(nil)

	hashInt := big.NewInt(0).SetBytes(hash)

	return hashInt.String()

}
gbotrel commented

Hi:

	h := mimc.NewMiMC()
	var message fr.Element
	message.SetString("0xdeadf00d")
	h.Write(message.Marshal())
	res := h.Sum(nil)

	var result fr.Element
	result.SetBytes(res)
	fmt.Println(result.String())
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