crypto.go

package main

import (
	"crypto/cipher"
	"crypto/aes"
	"fmt"
)

var block cipher.Block

func SetAES256Cipher(buf string) error {

	key := []byte(buf)

    var err error
	block, err = aes.NewCipher(key)
	if err != nil {
		return fmt.Errorf("Create Cipher:%s",err)
	}
    return nil
}

func EncryptAES256(t string) (string,error) {
    if block == nil {
        return "",fmt.Errorf("Call SetAES256Cipher()")
    }
    plain := []byte(t)
	cipher := make([]byte, len(plain))
	block.Encrypt(cipher, plain)
    return string(cipher),nil
}

func DecryptAES256(t string) (string,error) {
    if block == nil {
        return "",fmt.Errorf("Call SetAES256Cipher()")
    }
    cipher := []byte(t)
	text := make([]byte, len(cipher))
	block.Decrypt(text, cipher)
    return string(text),nil
}