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RsaCrypt.go
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RsaCrypt.go
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package goencrypt
import (
"encoding/pem"
"crypto/x509"
"crypto/rsa"
"crypto/rand"
"runtime"
"log"
)
/*
@Time : 2018/11/2 19:04
@Author : wuman
@File : rsacrypt
@Software: GoLand
*/
/*
用rsa加密操作
*/
//输出日志的格式
func init(){
log.SetFlags(log.Ldate|log.Lshortfile)
}
func RsaEncrypt(plainText ,key []byte)(cryptText []byte,err error){
/*file, _ := os.Open(path)
defer file.Close()
//1.1 读取文件的内容
// 获取文件的本身大小
fileInfo, _ := file.Stat()
buf := make([]byte,fileInfo.Size())
//1.2 将文件内容读取到buf中
file.Read(buf)
//2. pem 解码
fmt.Println(buf)
block, _ := pem.Decode(buf)*/
//1. pem 解码
block, _:= pem.Decode(key)
//防止用户传的密钥不正确导致panic,这里恢复程序并打印错误
defer func(){
if err:=recover();err!=nil{
switch err.(type){
case runtime.Error:
log.Println("runtime err:",err,"请检查密钥是否正确")
default:
log.Println("error:",err)
}
}
}()
//2. block中的Bytes是x509编码的内容, x509解码
publicKeyInterface,err := x509.ParsePKIXPublicKey(block.Bytes)
if err!=nil{
return []byte{},err //出错返回错误
}
//3.1 类型断言
publicKey := publicKeyInterface.(*rsa.PublicKey)
//4. 使用公钥对明文进行加密
cipherText, err := rsa.EncryptPKCS1v15(rand.Reader, publicKey, plainText)
if err!=nil{
return []byte{},err //出错返回错误
}
return cipherText,nil
}
func RsaDecrypt(cryptText ,key []byte)(plainText []byte,err error){
/*//1.打开文件
file, _ := os.Open(path)
defer file.Close()
//1.1 读取文件的内容
// 获取文件的本身大小
fileInfo, _ := file.Stat()
buf := make([]byte,fileInfo.Size())
//1.2 将文件内容读取到buf中
file.Read(buf)
//2. pem 解码
block, _ := pem.Decode(buf)*/
//1. pem格式解码
block, _ := pem.Decode(key)
//防止用户传的密钥不正确导致panic,这里恢复程序并打印错误
defer func(){
if err:=recover();err!=nil{
switch err.(type){
case runtime.Error:
log.Println("runtime err:",err,"请检查密钥是否正确")
default:
log.Println("error:",err)
}
}
}()
//2.x509解码
privateKey, err := x509.ParsePKCS1PrivateKey(block.Bytes)
if err!=nil{
return []byte{},err
}
//3. 解密操作
plainText,err= rsa.DecryptPKCS1v15(rand.Reader, privateKey, cryptText)
if err!=nil{
return []byte{},err
}
return plainText,nil
}