Hashing

Hash functions were introduced in Chapter 4, Non-Linear Data Structures. Hash implementation in Go has crc32 and sha256 implementations. An implementation of a hashing algorithm with multiple values using an XOR transformation is shown in the following code snippet. The CreateHash function takes a byte array, byteStr, as a parameter and returns the sha256 checksum of the byte array:

//main package has examples shown
// in Go Data Structures and algorithms book
package main

// importing fmt package
import (
  "fmt"
  "crypto/sha1"
  "hash"
)

//CreateHash method
func CreateHash(byteStr []byte) []byte {
  var hashVal hash.Hash
  hashVal = sha1.New()
  hashVal.Write(byteStr)

  var bytes []byte

  bytes = hashVal.Sum(nil)
  return bytes
}

In the following sections, we will discuss the different methods of hash algorithms.