Go语言实现AES加密并编写一个命令行应用程序

目录

• 什么是AES
• go实现aes加密
• 小案例需求
• 实战
• 加密代码
• 解密代码
• 实现passctl命令行应用
• 代码
• 编译成二进制后使用

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

packagemain

import(
"bytes"
"crypto/aes"
"crypto/cipher"
"encoding/base64"
"fmt"
)

varEncKey=[]byte("QAZWSXEDCRFVTGBY")//16位密码串

funcpkcs7Padding(data[]byte,blockSizeint)[]byte{
padding:=blockSize-len(data)%blockSize
padText:=bytes.Repeat([]byte{byte(padding)},padding)
returnappend(data,padText...)
}

funcAesEncrypt(data[]byte,key[]byte)([]byte,error){
block,err:=aes.NewCipher(key)
iferr!=nil{
returnnil,err
}
blockSize:=block.BlockSize()
encryptBytes:=pkcs7Padding(data,blockSize)
crypted:=make([]byte,len(encryptBytes))
blockMode:=cipher.NewCBCEncrypter(block,key[:blockSize])
blockMode.CryptBlocks(crypted,encryptBytes)
returncrypted,nil
}

funcEncryptByAes(data[]byte)(string,error){
res,err:=AesEncrypt(data,EncKey)
iferr!=nil{
return"",err
}
returnbase64.StdEncoding.EncodeToString(res),nil
}

funcmain(){
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。

packagemain

www.devze.comimport(
"crypto/aes"
"crypto/cipher"
"encoding/base64"
"errors"
"fmt"
)

varEncKey=[]byte("QAZWSXEDCRFVTGBY")//16位密码串

funcpkcs7UnPadding(data[]byte)([]byte,error){
length:=len(data)
iflength==0{
returnnil,errors.New("Sorry,theencryptionstringiswrong.")
}
unPadding:=int(data[length-1])
returndata[:(length-unPadding)],nil
}

funcAesDecrypt(data[]byte,key[]byte)([]byte,error){
block,err:=aes.NewCipher(key)
iferr!=nil{
returnnil,err
}
blockSize:=block.BlockSize()
blockMode:=cipher.NewCBCDecrypter(block,key[:blockSize])
crypted:=make([]byte,len(data))
blockMode.CryptBlocks(crypted,data)
crypted,err=pkcs7UnPadding(crypted)
iferr!=nil{
returnnil,err
}
returncrypted,nil
}

funcDecryptByAes(datastring)([]byte,error){
dataByte,err:=base64.StdEncoding.DecodeString(data)
iferr!=nil{
returnnil,err
}
returnAesDecrypt(dataByte,EncKey)
}

funcmain(){
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

packagemain

import(
"bytes"
"crypto/aes"
"crypto/cipher"
"encoding/base64"
"errors"
"fmt"
"os"
)

varEncKey=[]byte("QAZWSXEDCRFVTGBY")//16位密码串

funcpkcs7Padding(data[]byte,blockSizeint)[]byte{
padding:=blockSize-len(data)%blockSize
padText:=bytes.Repeat([]byte{byte(padding)},padding)javascript
returnappend(data,padText...)
}

funcpkcs7UnPadding(data[]byte)([]byte,error){
length:=len(data)
iflength==0{
returnnil,errors.New("Sorry,theencryptionstringiswrong.")
}
unPadding:=int(data[length-1])
returndata[:(length-unPadding)],nil
}

funcAesEncrypt(data[]byte,key[]byte)([]byte,error){
block,err:=aes.NewCipher(key)
iferr!=nil{
returnnil,err
}
blockSize:=block.BlockSize()
encryptBytes:=pkcs7Padding(data,blockSize)
crypted:=make([]byte,len(encryptBytes))
blockMode:=cipher.NewCBCEncrypter(block,key[:blockSize])
blockMode.CryptBlocks(crypted,encryptBytes)
returncrypted,nil
}

funcAesDecrypt(data[]byte,key[]byte)([]byte,error){
block,err:=aes.NewCipher(key)
iferr!=nil{
returnnil,err
}
blockSize:=block.BlockSize()
blockMode:=cipher.NewCBCDecrypter(blo开发者_Go培训ck,key[:blockSize]javascript)
crypted:=make([]byte,len(data))
blockMode.CryptBlocks(crypted,data)
crypted,err=pkcs7UnPadding(crypted)
iferr!=nil{
returnnil,err
}
returncrypted,nil
}

funcEncryptByAes(data[]byte)(string,error){
res,err:=AesjsEncrypt(data,EncKey)
iferr!=nil{
return"",err
}
returnbase64.StdEncoding.EncodeToString(res),nil
}

funcDecryptByAes(datastring)([]byte,error){
dataByte,err:=base64.StdEncoding.DecodeString(data)
iferr!=nil{
returnnil,err
}
returnAesDecrypt(dataByte,EncKey)
}

consthelp=`
Helpdescriptionofencryptionanddecryptioncommandlineapplication

-h--help[Displayhelp]
-e--encryptionPlaintextstringencryption
-d--decryptCiphertextstringdecryption

Example:

1.encryptionexample:
passctl-e"yourplaintextpassword"

2.decryptionexample:
passctl-d"Yourciphertextstring"

`

funcmain(){
args:=os.Args[1]
ifargs=="-h"||args=="--help"{
fmt.Print(help)
}elseifargs=="-e"||args=="--encryption"{
plaintext:=os.Args[2]
p:=[]byte(plaintext)
newp,_:=EncryptByAes(p)
fmt.Println(newp)
}elseifargs=="-d"||args=="--decrypt"{
ciphertext:=os.Args[2]
a,_:=DecryptByAes(ciphertext)
fmt.Println(string(a))
}else{
fmt.Println("Invalidoption")
}
}

编译成二进制后使用

#编译
[root@devhostencryptionDecryption]#gobuild-opassctlmain.go

#查看帮助
[root@devhostencryptionDecryption]#./passctl-h

Helpdescriptionofencryptionanddecryptioncommandlineapplication

-h--help[Displayhelp]
-e--encryptionPlaintextstringencryption
-d--decryptCiphertextstringdecryption

Example:

1.encryptionexample:
passctl-e"yourplaintextpassword"

2.decryptionexample:
passctl-d"Yourciphertextstring"

#加密
[root@devhostencryptionDecryption]#./passctl-eabc123456
nGi3ls+2yghdv7o8Ly2Z+A==

#解密
[root@devhostencryptionDecryption]#./passctl-dnGi3ls+2yghdv7o8Ly2Z+A==
abc123456
[root@devhostencryptionDecryption]#

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