go 使用AES256 加密、解密

go-aes256-encrypt-decrypt

func AESEncrypt(key, text string) ([]byte, error) {
	block, err := aes.NewCipher([]byte(key))
	if err != nil {
		return nil, err
	}
	b := Base64Encode([]byte(text))
	ciphertext := make([]byte, aes.BlockSize+len(b))
	iv := ciphertext[:aes.BlockSize]
	if _, err := io.ReadFull(rand.Reader, iv); err != nil {
		return nil, err
	}
	cfb := cipher.NewCFBEncrypter(block, iv)
	cfb.XORKeyStream(ciphertext[aes.BlockSize:], []byte(b))
	return ciphertext, nil
}
func AESDecrypt(key string, text []byte) ([]byte, error) {
	block, err := aes.NewCipher([]byte(key))
	if err != nil {
		return nil, err
	}
	if len(text) == 0 {
		return nil, nil
	}
	if len(text) < aes.BlockSize {
		return nil, errors.New("ciphertext too short" + " ,len=" + string(len(text)) + ",blocksize=" + string(aes.BlockSize))
	}
	iv := text[:aes.BlockSize]
	text = text[aes.BlockSize:]
	cfb := cipher.NewCFBDecrypter(block, iv)
	cfb.XORKeyStream(text, text)
	data, err := Base64Decode(text)
	if err != nil {
		return nil, err
	}
	return data, nil
}