gistfile1.txt

package main

import (
    kilic "github.com/kilic/bls12-381"
    "math/big"
    "fmt"
)

func decodeBignum(s string) *big.Int {
    if s == "" {
        s = "0"
    }

    bn, ok := new(big.Int).SetString(s, 10)
    if ok == false {
        panic("Cannot decode bignum")
    }
    return bn
}

func main() {
    var a, b kilic.Fr
    a.FromBytes(decodeBignum("52435875175126190479447740508185965837690552500527637822603658699938581184513").Bytes())
    b.FromBytes(decodeBignum("0").Bytes())
    fmt.Println(a.Equal(&b))
}

The above test returns false which seems to be correct. Could you please give more details on what the exact bug is? Thank you!

The first number was wrong. I've changed it to 52435875175126190479447740508185965837690552500527637822603658699938581184513.

N = 52435875175126190479447740508185965837690552500527637822603658699938581184513

Every number loaded with Fr.FromBytes should be reduced modulo N.
So if you load N, the effective value should be 0.

The program essentially computes 0 MOD N == N MOD N. Effectively this is 0 == 0. Hence it should print true, not false.