golang 在golang中使用AES256 GCM解密文本

Posted 2021-05-24

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import (
	"crypto/aes"
	"crypto/cipher"
	"crypto/rand"
 	"encoding/hex"
	"os"
)

// Decrypt will return the original value of the encrypted string
func Decrypt(encryptedKey []byte) ([]byte, error) {
	secretKey := getSecret()

	block, err := aes.NewCipher(secretKey)

	if err != nil {
		return nil, err
	}

	aesgcm, err := cipher.NewGCM(block)
	if err != nil {
		return nil, err
	}

	if len(encryptedKey) < aesgcm.NonceSize() {
		// worth panicking when encrypted key is bad
		panic("Malformed encrypted key")
	}

	return aesgcm.Open(
		nil,
		encryptedKey[:aesgcm.NonceSize()],
		encryptedKey[aesgcm.NonceSize():],
		nil,
	)
}

func getSecret() []byte {
	secret := os.Getenv("SECRET")
	if secret == "" {
		panic("Error: Must provide a secret key under env variable SECRET")
	}

	secretbite, err := hex.DecodeString(secret)

	if err != nil {
		// probably malform secret, panic out
		panic(err)
	}

	return secretbite
}

Golang里的AES加密解密

AES加密和解密的三种模式实现（CBC/ECB/CFB）

package main

import (
"bytes"
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"encoding/base64"
"encoding/hex"
"io"
"log"
)

func main() 
	origData := []byte("杰哥的技术杂货铺") // 待加密的数据
	key := []byte("ABCDEFGHIJKLMNOP") // 加密的密钥
	log.Println("原文：", string(origData))

	log.Println("------------------ CBC模式 --------------------")
	encrypted := AesEncryptCBC(origData, key)
	log.Println("密文(hex)：", hex.EncodeToString(encrypted))
	log.Println("密文(base64)：", base64.StdEncoding.EncodeToString(encrypted))
	decrypted := AesDecryptCBC(encrypted, key)
	log.Println("解密结果：", string(decrypted))

	log.Println("------------------ ECB模式 --------------------")
	encrypted = AesEncryptECB(origData, key)
	log.Println("密文(hex)：", hex.EncodeToString(encrypted))
	log.Println("密文(base64)：", base64.StdEncoding.EncodeToString(encrypted))
	decrypted = AesDecryptECB(encrypted, key)
	log.Println("解密结果：", string(decrypted))

	log.Println("------------------ CFB模式 --------------------")
	encrypted = AesEncryptCFB(origData, key)
	log.Println("密文(hex)：", hex.EncodeToString(encrypted))
	log.Println("密文(base64)：", base64.StdEncoding.EncodeToString(encrypted))
	decrypted = AesDecryptCFB(encrypted, key)
	log.Println("解密结果：", string(decrypted))

CBC/ECB/CFB 解密方法

// =================== CBC ======================
func AesEncryptCBC(origData []byte, key []byte) (encrypted []byte) 
	// 分组秘钥
	// NewCipher该函数限制了输入k的长度必须为16, 24或者32
	block, _ := aes.NewCipher(key)
	blockSize := block.BlockSize()                              // 获取秘钥块的长度
	origData = pkcs5Padding(origData, blockSize)                // 补全码
	blockMode := cipher.NewCBCEncrypter(block, key[:blockSize]) // 加密模式
	encrypted = make([]byte, len(origData))                     // 创建数组
	blockMode.CryptBlocks(encrypted, origData)                  // 加密
	return encrypted

func AesDecryptCBC(encrypted []byte, key []byte) (decrypted []byte) 
	block, _ := aes.NewCipher(key)                              // 分组秘钥
	blockSize := block.BlockSize()                              // 获取秘钥块的长度
	blockMode := cipher.NewCBCDecrypter(block, key[:blockSize]) // 加密模式
	decrypted = make([]byte, len(encrypted))                    // 创建数组
	blockMode.CryptBlocks(decrypted, encrypted)                 // 解密
	decrypted = pkcs5UnPadding(decrypted)                       // 去除补全码
	return decrypted

func pkcs5Padding(ciphertext []byte, blockSize int) []byte 
	padding := blockSize - len(ciphertext)%blockSize
	padtext := bytes.Repeat([]bytebyte(padding), padding)
	return append(ciphertext, padtext...)

func pkcs5UnPadding(origData []byte) []byte 
	length := len(origData)
	unpadding := int(origData[length-1])
	return origData[:(length - unpadding)]


// =================== ECB ======================
func AesEncryptECB(origData []byte, key []byte) (encrypted []byte) 
	cipher, _ := aes.NewCipher(generateKey(key))
	length := (len(origData) + aes.BlockSize) / aes.BlockSize
	plain := make([]byte, length*aes.BlockSize)
	copy(plain, origData)
	pad := byte(len(plain) - len(origData))
	for i := len(origData); i < len(plain); i++ 
		plain[i] = pad
	
	encrypted = make([]byte, len(plain))
	// 分组分块加密
	for bs, be := 0, cipher.BlockSize(); bs <= len(origData); bs, be = bs+cipher.BlockSize(), be+cipher.BlockSize() 
		cipher.Encrypt(encrypted[bs:be], plain[bs:be])
	

	return encrypted

func AesDecryptECB(encrypted []byte, key []byte) (decrypted []byte) 
	cipher, _ := aes.NewCipher(generateKey(key))
	decrypted = make([]byte, len(encrypted))
	//
	for bs, be := 0, cipher.BlockSize(); bs < len(encrypted); bs, be = bs+cipher.BlockSize(), be+cipher.BlockSize() 
		cipher.Decrypt(decrypted[bs:be], encrypted[bs:be])
	

	trim := 0
	if len(decrypted) > 0 
		trim = len(decrypted) - int(decrypted[len(decrypted)-1])
	

	return decrypted[:trim]

func generateKey(key []byte) (genKey []byte) 
	genKey = make([]byte, 16)
	copy(genKey, key)
	for i := 16; i < len(key); 
		for j := 0; j < 16 && i < len(key); j, i = j+1, i+1 
			genKey[j] ^= key[i]
		
	
	return genKey


// =================== CFB ======================
func AesEncryptCFB(origData []byte, key []byte) (encrypted []byte) 
	block, err := aes.NewCipher(key)
	if err != nil 
		panic(err)
	
	encrypted = make([]byte, aes.BlockSize+len(origData))
	iv := encrypted[:aes.BlockSize]
	if _, err := io.ReadFull(rand.Reader, iv); err != nil 
		panic(err)
	
	stream := cipher.NewCFBEncrypter(block, iv)
	stream.XORKeyStream(encrypted[aes.BlockSize:], origData)
	return encrypted

func AesDecryptCFB(encrypted []byte, key []byte) (decrypted []byte) 
	block, _ := aes.NewCipher(key)
	if len(encrypted) < aes.BlockSize 
		panic("ciphertext too short")
	
	iv := encrypted[:aes.BlockSize]
	encrypted = encrypted[aes.BlockSize:]

	stream := cipher.NewCFBDecrypter(block, iv)
	stream.XORKeyStream(encrypted, encrypted)
	return encrypted

输出结果：

2022/08/02 20:02:24 原文： 杰哥的技术杂货铺
2022/08/02 20:02:24 ------------------ CBC模式 --------------------
2022/08/02 20:02:24 密文(hex)： 6b11cae9b7831c3bbf1782a69e5504f5c32da4f6a5771e017f3a2d5ae8bf10b4
2022/08/02 20:02:24 密文(base64)： axHK6beDHDu/F4KmnlUE9cMtpPaldx4BfzotWui/ELQ=
2022/08/02 20:02:24 解密结果： 杰哥的技术杂货铺
2022/08/02 20:02:24 ------------------ ECB模式 --------------------
2022/08/02 20:02:24 密文(hex)： eb69b3c7921373408f371a9f608c5915bc72d09a06994af0788542bab88387a9
2022/08/02 20:02:24 密文(base64)： 62mzx5ITc0CPNxqfYIxZFbxy0JoGmUrweIVCuriDh6k=
2022/08/02 20:02:24 解密结果： 杰哥的技术杂货铺
2022/08/02 20:02:24 ------------------ CFB模式 --------------------
2022/08/02 20:02:24 密文(hex)： 483c4133a0ba7e0c8655d9e2a23acae4b13494a6036ab231b99bc01e7676fc0bb8c6ab7cbe6953ab
2022/08/02 20:02:24 密文(base64)： SDxBM6C6fgyGVdniojrK5LE0lKYDarIxuZvAHnZ2/Au4xqt8vmlTqw==
2022/08/02 20:02:24 解密结果： 杰哥的技术杂货铺

测试用例编写解密

func TestAesEcbDecrypt(t *testing.T) 
	origData := []byte("杰哥的技术杂货铺") // 待加密的数据
	key := []byte("^%TytgUYGsefsq7JYU5F2OIJ") // 加密的密钥
	log.Println("原文：", string(origData))

	log.Println("------------------ CBC模式 --------------------")
	encrypted := AesEncryptCBC(origData, key)
	log.Println("密文(hex)：", hex.EncodeToString(encrypted))
	log.Println("密文(base64)：", base64.StdEncoding.EncodeToString(encrypted))
	decrypted := AesDecryptCBC(encrypted, key)
	log.Println("解密结果：", string(decrypted))

	log.Println("------------------ ECB模式 --------------------")
	encrypted = AesEncryptECB(origData, key)
	log.Println("密文(hex)：", hex.EncodeToString(encrypted))
	log.Println("密文(base64)：", base64.StdEncoding.EncodeToString(encrypted))
	decrypted = AesDecryptECB(encrypted, key)
	log.Println("解密结果：", string(decrypted))

	log.Println("------------------ CFB模式 --------------------")
	encrypted = AesEncryptCFB(origData, key)
	log.Println("密文(hex)：", hex.EncodeToString(encrypted))
	log.Println("密文(base64)：", base64.StdEncoding.EncodeToString(encrypted))
	decrypted = AesDecryptCFB(encrypted, key)
	log.Println("解密结果：", string(decrypted))

输出结果：

=== RUN   TestAesEcbDecrypt
2022/08/03 11:23:50 原文： 杰哥的技术杂货铺
2022/08/03 11:23:50 ------------------ CBC模式 --------------------
2022/08/03 11:23:50 密文(hex)： 606072d10a591454e68069ff690e63ec0cd4dcd832922aa715aaf682ff645799
2022/08/03 11:23:50 密文(base64)： YGBy0QpZFFTmgGn/aQ5j7AzU3NgykiqnFar2gv9kV5k=
2022/08/03 11:23:50 解密结果： 杰哥的技术杂货铺
2022/08/03 11:23:50 ------------------ ECB模式 --------------------
2022/08/03 11:23:50 密文(hex)： d31dc8357a8ab488e453b0740e91d0c241b7743b6e02f942c0a15a4417ad518a
2022/08/03 11:23:50 密文(base64)： 0x3INXqKtIjkU7B0DpHQwkG3dDtuAvlCwKFaRBetUYo=
2022/08/03 11:23:50 解密结果： 杰哥的技术杂货铺
2022/08/03 11:23:50 ------------------ CFB模式 --------------------
2022/08/03 11:23:50 密文(hex)： e6da19018b091415326822560d16a8d614fcb0cad71bdbf3b3afe4bf3633d95e4036c5ed2a25272e
2022/08/03 11:23:50 密文(base64)： 5toZAYsJFBUyaCJWDRao1hT8sMrXG9vzs6/kvzYz2V5ANsXtKiUnLg==
2022/08/03 11:23:50 解密结果： 杰哥的技术杂货铺
--- PASS: TestAesEcbDecrypt (0.04s)
PASS

仅进行解密


func TestAesEcbDecrypt(t *testing.T) 
	key := []byte("^%TytgUYGsefsq7JYU5F2OIJ") // 加密的密钥

	log.Println("------------------ CBC模式 --------------------")
	encrypted,err1 := hex.DecodeString("606072d10a591454e68069ff690e63ec0cd4dcd832922aa715aaf682ff645799")
	if err1 != nil 
		t.Fatal(err1)
	
	decrypted := AesDecryptCBC(encrypted, key)
	log.Println("解密结果：", string(decrypted))

	log.Println("------------------ ECB模式 --------------------")
	encrypted,err2 := hex.DecodeString("d31dc8357a8ab488e453b0740e91d0c241b7743b6e02f942c0a15a4417ad518a")
	if err2 != nil 
		t.Fatal(err2)
	
	decrypted = AesDecryptECB(encrypted, key)
	log.Println("解密结果：", string(decrypted))

	log.Println("------------------ CFB模式 --------------------")
	encrypted,err3 := hex.DecodeString("ea9e17002777f1bc791d2be328c65206fff543c94b29341404926b6d0feb9a22428e6749c603352d")
	if err3 != nil 
		t.Fatal(err3)
	
	decrypted = AesDecryptCFB(encrypted, key)
	log.Println("解密结果：", string(decrypted))

输出结果：

=== RUN   TestAesEcbDecrypt
2022/08/03 11:21:27 ------------------ CBC模式 --------------------
2022/08/03 11:21:27 解密结果： 杰哥的技术杂货铺
2022/08/03 11:21:27 ------------------ ECB模式 --------------------
2022/08/03 11:21:27 解密结果： 杰哥的技术杂货铺
2022/08/03 11:21:27 ------------------ CFB模式 --------------------
2022/08/03 11:21:27 解密结果： 杰哥的技术杂货铺
--- PASS: TestAesEcbDecrypt (0.04s)
PASS

RSA

首先使用openssl生成公私钥

import (
    "crypto/rand"
    "crypto/rsa"
    "crypto/x509"
    "encoding/base64"
    "encoding/pem"
    "errors"
    "fmt"
)

// 私钥生成
//openssl genrsa -out rsa_private_key.pem 1024
var privateKey = []byte(`
-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----
`)

// 公钥: 根据私钥生成
//openssl rsa -in rsa_private_key.pem -pubout -out rsa_public_key.pem
var publicKey = []byte(`
-----BEGIN PUBLIC KEY-----
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDcGsUIIAINHfRTdMmgGwLrjzfM
NSrtgIf4EGsNaYwmC1GjF/bMh0Mcm10oLhNrKNYCTTQVGGIxuc5heKd1gOzb7bdT
nCDPPZ7oV7p1B9Pud+6zPacoqDz2M24vHFWYY2FbIIJh8fHhKcfXNXOLovdVBE7Z
y682X1+R1lRK8D+vmQIDAQAB
-----END PUBLIC KEY-----
`)

// 加密
func RsaEncrypt(origData []byte) ([]byte, error) 
    //解密pem格式的公钥
    block, _ := pem.Decode(publicKey)
    if block == nil 
        return nil, errors.New("public key error")
    
    // 解析公钥
    pubInterface, err := x509.ParsePKIXPublicKey(block.Bytes)
    if err != nil 
        return nil, err
    
    // 类型断言
    pub := pubInterface.(*rsa.PublicKey)
    //加密
    return rsa.EncryptPKCS1v15(rand.Reader, pub, origData)


// 解密
func RsaDecrypt(ciphertext []byte) ([]byte, error) 
    //解密
    block, _ := pem.Decode(privateKey)
    if block == nil 
        return nil, errors.New("private key error!")
    
    //解析PKCS1格式的私钥
    priv, err := x509.ParsePKCS1PrivateKey(block.Bytes)
    if err != nil 
        return nil, err
    
    // 解密
    return rsa.DecryptPKCS1v15(rand.Reader, priv, ciphertext)

func main() 
    data, _ := RsaEncrypt([]byte("hello world"))
    fmt.Println(base64.StdEncoding.EncodeToString(data))
    origData, _ := RsaDecrypt(data)
    fmt.Println(string(origData))

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