【代码】Go语言实现RSA加解密

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前言

Go语言实现RSA加解密

生成密钥对

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package main

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

// GenerateRSAKeys 生成密钥对
// bits 指定生成密钥对位数
// generateFile 是否生成密钥文件
func GenerateRSAKeys(bits int, generateFile bool) (publicKeyBase64String string, privateKeyBase64String string) {

	/* 生成私钥 */

	// 生成私钥
	privateKeyObject, _ := rsa.GenerateKey(rand.Reader, bits)
	// 通过x509对私钥编码为字符数组
	privateKeyByteArray := x509.MarshalPKCS1PrivateKey(privateKeyObject)
	// 转换为Base64编码的字符串
	privateKeyBase64String = base64.StdEncoding.EncodeToString(
		pem.EncodeToMemory(&pem.Block{
			Type:  "PUBLIC KEY",
			Bytes: privateKeyByteArray,
		}),
	)
	// 创建文件存储私钥
	if generateFile {
		privateKeyFile, _ := os.Create("private.pem")
		if err := pem.Encode(privateKeyFile, &pem.Block{
			Type:  "RSA Private Key",
			Bytes: privateKeyByteArray,
		}); err != nil {
			fmt.Println(err.Error())
		}
	}

	/* 生成公钥 */

	// 生成公钥
	publicKeyObject := &privateKeyObject.PublicKey
	// 通过x509对公钥编码
	publicKeyByteArray, _ := x509.MarshalPKIXPublicKey(publicKeyObject)
	// 转换为Base64编码的字符串
	publicKeyBase64String = base64.StdEncoding.EncodeToString(
		pem.EncodeToMemory(&pem.Block{
			Type:  "PRIVATE KEY",
			Bytes: publicKeyByteArray,
		}),
	)
	// 创建文件存储公钥
	if generateFile {
		publicKeyFile, _ := os.Create("public.pem")
		if err := pem.Encode(publicKeyFile, &pem.Block{
			Type:  "RSA Public Key",
			Bytes: publicKeyByteArray,
		}); err != nil {
			fmt.Println(err.Error())
		}
	}

	return privateKeyBase64String, publicKeyBase64String
}

RSA加密

  • 通过公钥进行RSA加密
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package main

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

// RSAEncrypt 通过RSA公钥加密字符串
// publicKeyFilePath 如果传递了公钥文件路径，就从公钥文件中获取私钥
// publicKeyBase64String 如果没有传递公钥文件路径，就从Base64字符串中获取公钥
func RSAEncrypt(plainText []byte, publicKeyFilePath string, publicKeyBase64String string) []byte {

	// 公钥字符数组
	var publicKeyByteArray []byte

	if publicKeyFilePath != "" {
		// 如果传递了文件路径，就从文件中获取公钥字符数组
		publicKeyFileObject, _ := os.Open(publicKeyFilePath)
		defer func(publicKeyFileObject *os.File) {
			if err := publicKeyFileObject.Close(); err != nil {
				fmt.Println(err.Error())
			}
		}(publicKeyFileObject)
		publicKeyFile, _ := publicKeyFileObject.Stat()
		publicKeyByteArray = make([]byte, publicKeyFile.Size())
		if _, err := publicKeyFileObject.Read(publicKeyByteArray); err != nil {
			fmt.Println(err.Error())
		}
	} else {
		// 如果没有传递文件路径，就从Base64字符串中获取公钥字符数组
		if res, err := base64.StdEncoding.DecodeString(publicKeyBase64String); err != nil {
			fmt.Println(err.Error())
		} else {
			publicKeyByteArray = res
		}
	}

	// pem解码
	block, _ := pem.Decode(publicKeyByteArray)
	// X509解码
	publicKey, _ := x509.ParsePKIXPublicKey(block.Bytes)
	// 对明文进行加密
	cipherText, _ := rsa.EncryptPKCS1v15(
		rand.Reader,
		publicKey.(*rsa.PublicKey),
		plainText,
	)

	//返回密文
	return cipherText
}

RSA解密

  • 通过私钥进行RSA解密
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package main

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

// RSADecrypt 通过RSA私钥解密字符串
// privateKeyFilePath 如果传递了私钥文件路径，就从私钥文件中获取私钥
// privateKeyBase64String 如果没有传递私钥文件路径，就从Base64字符串中获取私钥
func RSADecrypt(cipherText []byte, privateKeyFilePath string, privateKeyBase64String string) []byte {

	// 私钥字符数组
	var privateKeyByteArray []byte

	if privateKeyFilePath != "" {
		// 如果传递了文件路径，就从文件中获取公钥字符数组
		privateKeyFileObject, _ := os.Open(privateKeyFilePath)
		defer func(privateKeyFileObject *os.File) {
			if err := privateKeyFileObject.Close(); err != nil {
				fmt.Println(err.Error())
			}
		}(privateKeyFileObject)
		privateKeyFile, _ := privateKeyFileObject.Stat()
		privateKeyByteArray = make([]byte, privateKeyFile.Size())
		if _, err := privateKeyFileObject.Read(privateKeyByteArray); err != nil {
			fmt.Println(err.Error())
		}
	} else {
		// 如果没有传递文件路径，就从Base64字符串中获取公钥字符数组
		if res, err := base64.StdEncoding.DecodeString(privateKeyBase64String); err != nil {
			fmt.Println(err.Error())
		} else {
			privateKeyByteArray = res
		}
	}

	// pem解码
	block, _ := pem.Decode(privateKeyByteArray)
	// X509解码
	privateKey, _ := x509.ParsePKCS1PrivateKey(block.Bytes)
	// 对密文进行解密
	plainText, _ := rsa.DecryptPKCS1v15(
		rand.Reader,
		privateKey,
		cipherText,
	)

	//返回明文
	return plainText
}

完成

参考文献

CSDN——起个破名真费劲..
CSDN——Axing丶