crypt.go

var KEY_CRIPTY = []byte("@E#%_323E5%DMG!(332GG()!")

// encrypt string to base64 crypto using AES
func encrypt(key []byte, text string) string {
	plaintext := []byte(text)

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

	// The IV needs to be unique, but not secure. Therefore it's common to
	// include 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 {
		fmt.Println(err)
	}

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

	// convert to base64
	return base64.URLEncoding.EncodeToString(ciphertext)
}

// decrypt from base64 to decrypted string
func decrypt(key []byte, cryptoText string) string {
	ciphertext, _ := base64.URLEncoding.DecodeString(cryptoText)

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

	// The IV needs to be unique, but not secure. Therefore it's common to
	// include it at the beginning of the ciphertext.
	if len(ciphertext) < aes.BlockSize {
		fmt.Println("ciphertext too short")
	}
	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)

	return fmt.Sprintf("%s", ciphertext)
}

//example model

package model

type UserBank struct {
	Model
	Name   string `json:"name,omitempty" sql:"not null"`
	Type   string `json:"type,omitempty" sql:"not null"`
	Agency string `json:"agency,omitempty" sql:"not null"`
	Number string `json:"number,omitempty" sql:"not null"`
}

func (ub UserBank) EncryptBank() UserBank {
	ub.Name = encrypt(KEY_CRIPTY, ub.Name)
	ub.Type = encrypt(KEY_CRIPTY, ub.Type)
	ub.Agency = encrypt(KEY_CRIPTY, ub.Agency)
	ub.Number = encrypt(KEY_CRIPTY, ub.Number)
	return ub
}

func (ub UserBank) DecryptBank() UserBank {
	ub.Name = decrypt(KEY_CRIPTY, ub.Name)
	ub.Type = decrypt(KEY_CRIPTY, ub.Type)
	ub.Agency = decrypt(KEY_CRIPTY, ub.Agency)
	ub.Number = decrypt(KEY_CRIPTY, ub.Number)
	return ub
}