I have some data in form of map and I'm converting it to []byt and signing it and when verifying, it gives True value even when data used for verifying and signing are different. Here is what I did-
func main(){
n, _ := ioutil.ReadFile("privatekey")
private_key,_ := x509.ParseECPrivateKey(n)
public_key := private_key.PublicKey
data := map[string]string{
"data1": "somestring",
"data2": "12312",
"data3": "34fs4",
}
json_data, _ := json.Marshal(data)
data_2 := map[string]string{
"data1": "somestring",
"data2": "13312",
"data4": "fh34",
}
json_data_2,_ := json.Marshal(data_2)
r, s, _ := ecdsa.Sign(rand.Reader, private_key, json_data)
verifystatus := ecdsa.Verify(&public_key, json_data_2, r, s)
fmt.Println(verifystatus)
}
It is printing true. I tried changing the data and it seems that If json_data and json_data_2 have first 32 bytes common, then Verify returns true. Is there some limit over the length of byte array I can send to ecdsa.Verify()? If so how can I use it for larger data?