Go语言实现AES加密并编写一个命令行应用程序
什么是AES
关于AES更多的知识，请自行脑补，密码学中的高级加密标准（Advanced Encryption Standard，AES），又称Rijndael加密法，是经常采用的一种区块加密标准。
go实现aes加密
在golang的标准库aes可以实现AES加密，官方标准库aes文档链接：https://pkg.go.dev/crypto/aes
小案例需求
本篇分享出在实际工作中的实际需求，需求很简单，就是需要实现一个命令行应用程序，可以对传入的明文字符串进行加密，传入密文进行解密。命令行应用叫做passctl，并带有帮助功能。实现命令行应用程序有很多强大的第三方库，因为需求过于简单，那么本篇就用标准库中os即可。
实战
加密代码
package main
import (
"bytes"
"crypto/aes"
"crypto/cipher"
"encoding/base64"
"fmt"
)
var EncKey = []byte("QAZWSXEDCRFVTGBY") // 16位密码串
func pkcs7Padding(data []byte, blockSize int) []byte {
padding := blockSize - len(data)%blockSize
padText := bytes.Repeat([]byte{byte(padding)}, padding)
return append(data, padText...)
}
func AesEncrypt(data []byte, key []byte) ([]byte, error) {
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
blockSize := block.BlockSize()
encryptBytes := pkcs7Padding(data, blockSize)
crypted := make([]byte, len(encryptBytes))
blockMode := cipher.NewCBCEncrypter(block, key[:blockSize])
blockMode.CryptBlocks(crypted, encryptBytes)
return crypted, nil
}
func EncryptByAes(data []byte) (string, error) {
res, err := AesEncrypt(data, EncKey)
if err != nil {
return "", err
}
return base64.StdEncoding.EncodeToString(res), nil
}
func main() {
plaintext := "2wsx$RFV!Qaz" // 假设这是明文密码
p := []byte(plaintext)
newp, _ := EncryptByAes(p) // 开始加密
fmt.Println(newp)
}
解密代码
基于上述加密后的密码，对其进行解密。
package main
import (
"crypto/aes"
"crypto/cipher"
"encoding/base64"
"errors"
"fmt"
)
var EncKey = []byte("QAZWSXEDCRFVTGBY") // 16位密码串
func pkcs7UnPadding(data []byte) ([]byte, error) {
length := len(data)
if length == 0 {
return nil, errors.New("Sorry, the encryption string is wrong.")
}
unPadding := int(data[length-1])
return data[:(length - unPadding)], nil
}
func AesDecrypt(data []byte, key []byte) ([]byte, error) {
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
blockSize := block.BlockSize()
blockMode := cipher.NewCBCDecrypter(block, key[:blockSize])
crypted := make([]byte, len(data))
blockMode.CryptBlocks(crypted, data)
crypted, err = pkcs7UnPadding(crypted)
if err != nil {
return nil, err
}
return crypted, nil
}
func DecryptByAes(data string) ([]byte, error) {
dataByte, err := base64.StdEncoding.DecodeString(data)
if err != nil {
return nil, err
}
return AesDecrypt(dataByte, EncKey)
}
func main() {
ciphertext := "+LxjKS8N+Kpy/HNxsSJMIw==" // 密文
pwd, _ := DecryptByAes(ciphertext) // 开始解密
fmt.Println(string(pwd))
}
实现passctl命令行应用
代码
package main
import (
"bytes"
"crypto/aes"
"crypto/cipher"
"encoding/base64"
"errors"
"fmt"
"os"
)
var EncKey = []byte("QAZWSXEDCRFVTGBY") // 16位密码串
func pkcs7Padding(data []byte, blockSize int) []byte {
padding := blockSize - len(data)%blockSize
padText := bytes.Repeat([]byte{byte(padding)}, padding)
return append(data, padText...)
}
func pkcs7UnPadding(data []byte) ([]byte, error) {
length := len(data)
if length == 0 {
return nil, errors.New("Sorry, the encryption string is wrong.")
}
unPadding := int(data[length-1])
return data[:(length - unPadding)], nil
}
func AesEncrypt(data []byte, key []byte) ([]byte, error) {
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
blockSize := block.BlockSize()
encryptBytes := pkcs7Padding(data, blockSize)
crypted := make([]byte, len(encryptBytes))
blockMode := cipher.NewCBCEncrypter(block, key[:blockSize])
blockMode.CryptBlocks(crypted, encryptBytes)
return crypted, nil
}
func AesDecrypt(data []byte, key []byte) ([]byte, error) {
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
blockSize := block.BlockSize()
blockMode := cipher.NewCBCDecrypter(block, key[:blockSize])
crypted := make([]byte, len(data))
blockMode.CryptBlocks(crypted, data)
crypted, err = pkcs7UnPadding(crypted)
if err != nil {
return nil, err
}
return crypted, nil
}
func EncryptByAes(data []byte) (string, error) {
res, err := AesEncrypt(data, EncKey)
if err != nil {
return "", err
}
return base64.StdEncoding.EncodeToString(res), nil
}
func DecryptByAes(data string) ([]byte, error) {
dataByte, err := base64.StdEncoding.DecodeString(data)
if err != nil {
return nil, err
}
return AesDecrypt(dataByte, EncKey)
}
const help = `
Help description of encryption and decryption command line application
-h --help [Display help]
-e --encryption Plaintext string encryption
-d --decrypt Ciphertext string decryption
Example:
1. encryption example:
passctl -e "your plaintext passWord"
2. decryption example:
passctl -d "Your ciphertext string"
`
func main() {
args := os.Args[1]
if args == "-h" || args == "--help" {
fmt.Print(help)
} else if args == "-e" || args == "--encryption" {
plaintext := os.Args[2]
p := []byte(plaintext)
newp, _ := EncryptByAes(p)
fmt.Println(newp)
} else if args == "-d" || args == "--decrypt" {
ciphertext := os.Args[2]
a, _ := DecryptByAes(ciphertext)
fmt.Println(string(a))
} else {
fmt.Println("Invalid option")
}
}
编译成二进制后使用
# 编译
[root@devhost encryptionDecryption]# go build -o passctl main.go
# 查看帮助
[root@devhost encryptionDecryption]# ./passctl -h
Help description of encryption and decryption command line application
-h --help [Display help]
-e --encryption Plaintext string encryption
-d --decrypt Ciphertext string decryption
Example:
1. encryption example:
passctl -e "your plaintext password"
2. decryption example:
passctl -d "Your ciphertext string"
# 加密
[root@devhost encryptionDecryption]# ./passctl -e abc123456
nGi3ls+2yghdv7o8Ly2Z+A==
# 解密
[root@devhost encryptionDecryption]# ./passctl -d nGi3ls+2yghdv7o8Ly2Z+A==
abc123456
[root@devhost encryptionDecryption]# 到此这篇关于Go语言实现AES加密并编写一个命令行应用程序的文章就介绍到这了,更多相关Go语言AES加密内容请搜索以前的文章或继续浏览下面的相关文章希望大家以后多多支持！
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