Farmer key miss match

[goomario]

TestCase:

func TestSignature(t *testing.T) {
	var seed [64]byte
	for i := 0; i < 100; i++ {
		_, _ = rand.Read(seed[:])

		// blsgo
		blsgoPrivateKey := blsgo.KeyGen(seed[:])
		blsgoFarmerPrivateKey := blsgoPrivateKey.FarmerSk()
		blsgoFarmerPrivateKeyBytes := blsgoFarmerPrivateKey.Bytes()

		// chia bls with cgo
		blsPrivateKey, _ := bls.GenerateKeyFromSeed(seed[:])
		blsFarmerPrivateKey := blsPrivateKey.DeriveChild([]int{12381, 8444, 0, 0})
		blsFarmerPrivateKeyBytes, _ := blsFarmerPrivateKey.MarshalBinary()

		if bytes.Compare(blsgoFarmerPrivateKeyBytes, blsFarmerPrivateKeyBytes) != 0 {
			t.Errorf("Bad farmer key: i=%d seed=%s blsgo=%s chia-bls=%s", i, hex.EncodeToString(seed[:]),
				hex.EncodeToString(blsgoFarmerPrivateKeyBytes),
				hex.EncodeToString(blsFarmerPrivateKeyBytes))
		}
	}
}

Output:

=== RUN   TestSignature
    service_test.go:142: Bad farmer key: i=23 seed=53f830604c1432a737b18b8f8d94fe897e735cba0fcd3f2cf0212973a521f84bf9ed8bb739012d6811c81d0c4dff726642225dcb8e63d4bdf02341a5fa5c1101 blsgo=090ccc11e11032e691f1c0671c8aa43b2fc6fef7b6e0101ffb289e2cce9bf422 chia-bls=3cd15ca01d255815a8dc24a6b3344761c3578b4d2b325aced906a65072f4f612
    service_test.go:142: Bad farmer key: i=35 seed=9ad7c719f59d794bb8527dcafa4a17243df11b12e1b077ad39d60cd4d0409432d13ba749d6932792b218b28a361a545cf5aa174e3d236039193f603eaa128dd6 blsgo=0433e87b7c5ea124b0ebe1cbb7d96c7fbf59aa49b2d891f50d99f517b82ab97d chia-bls=5479365fdd776bff9e8daa9ea79c58a1b8af08b907c733c81b9cfd3f43fbd31c
    service_test.go:142: Bad farmer key: i=70 seed=2d59eab383318d51a26290cb78cbcdc9941c21e175d446779025ddb20643da99b87dfcc14e012ba2029e5574bcc1e71344172c18810db086696ba0593b0c8500 blsgo=67d2819d00db4bc1d14a3cf7e131b3b1f4085f10bbcea53f225e9b9c6f9b1454 chia-bls=66c9a4109557cfe20199565e5138ceecdea77a5db8b1eb88cb1169ba5367edb5
    service_test.go:142: Bad farmer key: i=75 seed=eb0dcf3c89de963b4f047dd85f79212b0dbf269d73deae5ab3d043f815778394d6ac9ff01526127520d35916eed90aada0f4f05b50c17a1648a141f79b5d495b blsgo=3645c8df7e38d12464eca7f7f9711edc538d91aa8545d42c8c01d6848856105e chia-bls=05a891a033d8b47931bed5594eadf754e7d751fa15ddbd27bcd2b7c8283616d4
    service_test.go:142: Bad farmer key: i=79 seed=a83903c9c2acef4c279c98faaa2d6656f146139c2a0b0839e36a0304f6f2755c19f27575e3a5342f88f5a255290112c152b97032df5af5d1e3c6235f4e42fb39 blsgo=17721e215429eaf5657cea3b2ccb1b968df1c9475739c8a275216898a8abda7d chia-bls=666bf79655c82de816fa22781d0cce550b03820b4e6641f7938466577aa5700c
--- FAIL: TestSignature (1.12s)

[chuwt]

Hi @goomario , thanks for the report, the bug was fixed, this bug was caused by the wrong use of big.Int.Bytes(), it should be replaced with big.Int.FillBytes()

chia-bls-go/util.go

Lines 37 to 38 in 447398c

	ikm := make([]byte, 32)
	parentSk.value.FillBytes(ikm)