I generated a hash value using sha3 and I need to convert it to a big.Int value. Is it possible ? or is there a method to get the integervalue of the hash ?
the following code throws an error that cannot convert type hash.Hash to type int64 :
package main
import (
"math/big"
"golang.org/x/crypto/sha3"
"fmt"
)
func main(){
chall := "hello word"
b := byte[](chall)
h := sha3.New244()
h.Write(chall)
h.Write(b)
d := make([]byte, 16)
h.Sum(d)
val := big.NewInt(int64(h))
fmt.Println(val)
}
(See Peter's comment for the simpler version of this.)
Interpreting a series of bytes as a big.Int is the same as interpreting a series of decimal digits as an arbitrarily large number. For example, to convert the digits 1234 into a "number", you'd do this:
The same applies to bytes. The "digits" are just base-256 rather than base-10:
val := big.NewInt(0)
for i := 0; i < h.Size(); i++ {
val.Lsh(val, 8)
val.Add(val, big.NewInt(int64(d[i])))
}
(Lsh is a left-shift. Left shifting by 8 bits is the same as multiplying by 256.)