hotime/dri/rsa/deencrypt.go
2022-03-13 01:48:54 +08:00

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package rsa
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/asn1"
"encoding/pem"
"fmt"
"os"
)
func FileGet(path string) []byte {
file, err := os.Open(path)
if err != nil {
panic(err)
}
defer file.Close()
//读取文件的内容
info, _ := file.Stat()
buf := make([]byte, info.Size())
file.Read(buf)
return buf
}
// RSA_Encrypt RSA加密
// plainText 要加密的数据
// path 公钥匙文件地址
func RSA_Encrypt(plainText []byte, buf []byte) []byte {
//pem解码
block, _ := pem.Decode(buf)
//x509解码
publicKeyInterface, err := x509.ParsePKIXPublicKey(block.Bytes)
if err != nil {
panic(err)
}
//类型断言
publicKey := publicKeyInterface.(*rsa.PublicKey)
//对明文进行加密
cipherText, err := rsa.EncryptPKCS1v15(rand.Reader, publicKey, plainText)
if err != nil {
panic(err)
}
//返回密文
return cipherText
}
// RSA_Decrypt RSA解密
// cipherText 需要解密的byte数据
// path 私钥文件路径
func RSA_Decrypt(cipherText []byte, buf []byte) []byte {
//pem解码
block, _ := pem.Decode(buf)
//X509解码
private, err := x509.ParsePKCS8PrivateKey(block.Bytes)
if err != nil {
panic(err)
}
//对密文进行解密
//plainText,_:=rsa.DecryptPKCS1v15(rand.Reader,privateKey,cipherText)
v, err := rsa.DecryptPKCS1v15(rand.Reader, private.(*rsa.PrivateKey), cipherText)
//返回明文
return v
}
func MarshalPKCS8PrivateKey(key *rsa.PrivateKey) []byte {
info := struct {
Version int
PrivateKeyAlgorithm []asn1.ObjectIdentifier
PrivateKey []byte
}{}
info.Version = 0
info.PrivateKeyAlgorithm = make([]asn1.ObjectIdentifier, 1)
info.PrivateKeyAlgorithm[0] = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 1}
info.PrivateKey = x509.MarshalPKCS1PrivateKey(key)
k, err := asn1.Marshal(info)
if err != nil {
panic(err.Error())
}
return k
}
func Demo() {
//生成密钥对,保存到文件
GenerateRSAKey(2048, "./")
//加密
data := []byte("hello world")
encrypt := RSA_Encrypt(data, FileGet("public.pem"))
fmt.Println(string(encrypt))
// 解密
decrypt := RSA_Decrypt(encrypt, FileGet("private.pem"))
fmt.Println(string(decrypt))
}
// GenerateRSAKey 生成RSA私钥和公钥保存到文件中
// bits 证书大小
func GenerateRSAKey(bits int, path string) {
//GenerateKey函数使用随机数据生成器random生成一对具有指定字位数的RSA密钥
//Reader是一个全局、共享的密码用强随机数生成器
privateKey, err := rsa.GenerateKey(rand.Reader, bits)
if err != nil {
panic(err)
}
//保存私钥
//通过x509标准将得到的ras私钥序列化为ASN.1 的 DER编码字符串
X509PrivateKey := x509.MarshalPKCS1PrivateKey(privateKey)
//使用pem格式对x509输出的内容进行编码
//创建文件保存私钥
privateFile, err := os.Create(path + "private.pem")
if err != nil {
panic(err)
}
defer privateFile.Close()
//构建一个pem.Block结构体对象
privateBlock := pem.Block{Type: "RSA Private Key", Bytes: X509PrivateKey}
//将数据保存到文件
pem.Encode(privateFile, &privateBlock)
//保存公钥
//获取公钥的数据
publicKey := privateKey.PublicKey
//X509对公钥编码
X509PublicKey, err := x509.MarshalPKIXPublicKey(&publicKey)
if err != nil {
panic(err)
}
//pem格式编码
//创建用于保存公钥的文件
publicFile, err := os.Create(path + "public.pem")
if err != nil {
panic(err)
}
defer publicFile.Close()
//创建一个pem.Block结构体对象
publicBlock := pem.Block{Type: "RSA Public Key", Bytes: X509PublicKey}
//保存到文件
pem.Encode(publicFile, &publicBlock)
}