fuwalab/tools

//Package util contains utilities of toolkit like encrypting, decrypting and so on.
package util

import (
    "crypto/aes"
    "crypto/cipher"
    "crypto/md5"
    "encoding/hex"
    "fmt"
)

var hashed = md5.Sum([]byte("fuwalab"))
var commonIV = hashed[:]

// cipher key
var keyString = "tqax/vkLME-CjEP3##u/rVLi),XNGrZ-"

// Encrypt encrypt string
func Encrypt(s string) string {
    plaintext := []byte(s)

    c, err := aes.NewCipher([]byte(keyString))
    if err != nil {
        fmt.Printf("Error: NewCipher(%d bytes) = %s", len(keyString), err)
        panic(err)
    }

    cfb := cipher.NewCFBEncrypter(c, commonIV)
    cipherText := make([]byte, len(plaintext))
    cfb.XORKeyStream(cipherText, plaintext)

    return fmt.Sprintf("%x", cipherText)
}

// Decrypt decrypt string
func Decrypt(s string) string {
    c, err := aes.NewCipher([]byte(keyString))
    if err != nil {
        fmt.Printf("Error: NewCipher(%d bytes) = %s", len(keyString), err)
        panic(err)
    }

    ciphertext, _ := hex.DecodeString(s)
    cfbdec := cipher.NewCFBDecrypter(c, commonIV)
    plaintextCopy := make([]byte, len(ciphertext))
    cfbdec.XORKeyStream(plaintextCopy, ciphertext)

    return string(plaintextCopy)
}