NewEncrypt.go

package main

import (
	"crypto/aes"
	"crypto/cipher"
	"crypto/rand"
	"encoding/base64"
	"errors"
	"io"
	"log"
)

func main() {
	cipherKey := []byte("0000000000000000")
	//msg := "Demo"

	//if encrypted, err := encrypt(cipherKey, msg); err != nil {
	//	log.Println(err)
	//} else {
	log.Printf("CIPHER KEY: %s\n", string(cipherKey))
	//	log.Printf("ENCRYPTED: %s\n", encrypted)

	if decrypted, err := decrypt(cipherKey, "HzBp_gnpAKKZF-j3NRF8sohw-ko="); err != nil {
		log.Println(err)
	} else {
		log.Printf("DECRYPTED: %s\n", decrypted)
	}
	//}
}

func encrypt(key []byte, message string) (encmess string, err error) {
	plainText := []byte(message)

	block, err := aes.NewCipher(key)
	if err != nil {
		return
	}

	//IV needs to be unique, but doesn't have to be secure.
	//It's common to put it at the beginning of the ciphertext.
	cipherText := make([]byte, aes.BlockSize+len(plainText))
	iv := cipherText[:aes.BlockSize]
	if _, err = io.ReadFull(rand.Reader, iv); err != nil {
		return
	}

	stream := cipher.NewCFBEncrypter(block, iv)
	stream.XORKeyStream(cipherText[aes.BlockSize:], plainText)

	//returns to base64 encoded string
	encmess = base64.URLEncoding.EncodeToString(cipherText)
	return
}

func decrypt(key []byte, securemess string) (decodedmess string, err error) {
	cipherText, err := base64.URLEncoding.DecodeString(securemess)
	if err != nil {
		return
	}

	block, err := aes.NewCipher(key)
	if err != nil {
		return
	}

	if len(cipherText) < aes.BlockSize {
		err = errors.New("Ciphertext block size is too short!")
		return
	}

	iv := cipherText[:aes.BlockSize]
	cipherText = cipherText[aes.BlockSize:]

	stream := cipher.NewCFBDecrypter(block, iv)
	// XORKeyStream can work in-place if the two arguments are the same.
	stream.XORKeyStream(cipherText, cipherText)

	decodedmess = string(cipherText)
	return
}