Golang代码搜集-基于RSA的公钥加密私钥解密-私钥签名公钥验证

分手后的思念是犯贱 2021-09-14 22:18 541阅读 0赞

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[C\#、Golang、Python、Java（Android）之间Des、Rsa加解密互通系列之Golang][C_Golang_Python_Java_Android_Des_Rsa_Golang]  
首先由genkey.go生成公钥和私文件，在rsa.go里使用生成的公钥和私钥进行加密和解密

//文件 genkey.go
    //生成公钥和私钥 pem文件
    
    package main
    
    import (
    	"crypto/rand"
    	"crypto/rsa"
    	"crypto/x509"
    	"encoding/pem"
    	"flag"
    	"log"
    	"os"
    )
    
    func main() {
    	var bits int
    	flag.IntVar(&bits, "b", 1024, "秘钥长度，默认为1024")
    	if err := GenRsaKey(bits); err != nil {
    		log.Fatal("秘钥文件生成失败")
    	}
    	log.Println("秘钥文件生成成功")
    }
    
    //生成 私钥和公钥文件
    func GenRsaKey(bits int) error {
    	//生成私钥文件
    	privateKey, err := rsa.GenerateKey(rand.Reader, bits)
    	if err != nil {
    		return err
    	}
    	derStream := x509.MarshalPKCS1PrivateKey(privateKey)
    	block := &pem.Block{
    		Type:  "RSA PRIVATE KEY",
    		Bytes: derStream,
    	}
    	file, err := os.Create("private.pem")
    	if err != nil {
    		return err
    	}
    	err = pem.Encode(file, block)
    	if err != nil {
    		return err
    	}
    	//生成公钥文件
    	publicKey := &privateKey.PublicKey
    	defPkix, err := x509.MarshalPKIXPublicKey(publicKey)
    	if err != nil {
    		return err
    	}
    	block = &pem.Block{
    		Type:  "RSA PUBLIC KEY",
    		Bytes: defPkix,
    	}
    	file, err = os.Create("public.pem")
    	if err != nil {
    		return err
    	}
    	err = pem.Encode(file, block)
    	if err != nil {
    		return err
    	}
    	return nil
    }

//rsa.go
    //公钥加密私钥解密  私钥签名公钥验证
    
    package main
    
    import (
    	"crypto"
    	"crypto/rand"
    	"crypto/rsa"
    	"crypto/sha256"
    	"crypto/x509"
    	"encoding/pem"
    	"errors"
    	"fmt"
    	"io/ioutil"
    	"os"
    )
    
    var privateKey, publicKey []byte
    
    func init() {
    	var err error
    	publicKey, err = ioutil.ReadFile("public.pem")
    	if err != nil {
    		os.Exit(-1)
    	}
    	privateKey, err = ioutil.ReadFile("private.pem")
    	if err != nil {
    		os.Exit(-1)
    	}
    	//fmt.Printf("%s\n", publicKey)
    	//fmt.Printf("%s\n", privateKey)
    }
    func main() {
    	var theMsg = "the message you want to encode 你好 世界"
    	fmt.Println("Source:", theMsg)
    	//私钥签名
    	sig, _ := RsaSign([]byte(theMsg))
    	fmt.Println(string(sig))
    	//公钥验证
    	fmt.Println(RsaSignVer([]byte(theMsg), sig))
    	//公钥加密
    	//	enc, _ := RsaEncrypt([]byte(theMsg))
    	//	fmt.Println("Encrypted:", string(enc))
    	//	//私钥解密
    	//	decstr, _ := RsaDecrypt(enc)
    	//	fmt.Println("Decrypted:", string(decstr))
    }
    
    //私钥签名
    func RsaSign(data []byte) ([]byte, error) {
    	h := sha256.New()
    	h.Write(data)
    	hashed := h.Sum(nil)
    	//获取私钥
    	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
    	}
    	return rsa.SignPKCS1v15(rand.Reader, priv, crypto.SHA256, hashed)
    }
    
    //公钥验证
    func RsaSignVer(data []byte, signature []byte) error {
    	hashed := sha256.Sum256(data)
    	block, _ := pem.Decode(publicKey)
    	if block == nil {
    		return errors.New("public key error")
    	}
    	// 解析公钥
    	pubInterface, err := x509.ParsePKIXPublicKey(block.Bytes)
    	if err != nil {
    		return err
    	}
    	// 类型断言
    	pub := pubInterface.(*rsa.PublicKey)
    	//验证签名
    	return rsa.VerifyPKCS1v15(pub, crypto.SHA256, hashed[:], signature)
    }
    
    // 公钥加密
    func RsaEncrypt(data []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, data)
    }
    
    // 私钥解密
    func RsaDecrypt(ciphertext []byte) ([]byte, error) {
    	//获取私钥
    	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)
    }

[C_Golang_Python_Java_Android_Des_Rsa_Golang]: https://blog.csdn.net/lhtzbj12/article/details/84799827