// DoubleSha256 calculates sha256(sha256(b)) and returns the resulting bytes.
func DoubleSha256(b []byte) []byte {
hasher := fastsha256.New()
hasher.Write(b)
sum := hasher.Sum(nil)
hasher.Reset()
hasher.Write(sum)
return hasher.Sum(nil)
}
// Sha256 calculates sha256(b)) and returns the resulting bytes.
func Sha256(b []byte) []byte {
hasher := fastsha256.New()
hasher.Write(b)
return hasher.Sum(nil)
}