Go 언어의 암호화 및 복호화 기능을 배우고 비대칭 암호화 알고리즘을 구현합니다.

go get -u github.com/golang/crypto

package main

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

func main() {
    // 生成 RSA 密钥对
    privateKey, err := rsa.GenerateKey(rand.Reader, 2048)
    if err != nil {
        fmt.Println("Failed to generate private key:", err)
        return
    }

    // 将私钥保存到文件中
    privateKeyFile, err := os.Create("private.key")
    if err != nil {
        fmt.Println("Failed to create private key file:", err)
        return
    }
    defer privateKeyFile.Close()

    privateKeyBlock := &pem.Block{
        Type:  "RSA PRIVATE KEY",
        Bytes: x509.MarshalPKCS1PrivateKey(privateKey),
    }

    err = pem.Encode(privateKeyFile, privateKeyBlock)
    if err != nil {
        fmt.Println("Failed to encode private key:", err)
        return
    }

    // 将公钥保存到文件中
    publicKey := &privateKey.PublicKey
    publicKeyFile, err := os.Create("public.key")
    if err != nil {
        fmt.Println("Failed to create public key file:", err)
        return
    }
    defer publicKeyFile.Close()

    publicKeyBlock := &pem.Block{
        Type:  "RSA PUBLIC KEY",
        Bytes: x509.MarshalPKCS1PublicKey(publicKey),
    }

    err = pem.Encode(publicKeyFile, publicKeyBlock)
    if err != nil {
        fmt.Println("Failed to encode public key:", err)
        return
    }

    fmt.Println("Keys generated successfully!")
}

package main

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

func main() {
    // 加载公钥文件
    publicKeyFile, err := os.Open("public.key")
    if err != nil {
        fmt.Println("Failed to open public key file:", err)
        return
    }
    defer publicKeyFile.Close()

    publicKeyData, err := ioutil.ReadAll(publicKeyFile)
    if err != nil {
        fmt.Println("Failed to read public key file:", err)
        return
    }

    publicKeyBlock, _ := pem.Decode(publicKeyData)
    if publicKeyBlock == nil {
        fmt.Println("Failed to decode public key")
        return
    }

    publicKey, err := x509.ParsePKCS1PublicKey(publicKeyBlock.Bytes)
    if err != nil {
        fmt.Println("Failed to parse public key:", err)
        return
    }

    // 加密数据
    plaintext := []byte("Hello, World!")
    ciphertext, err := rsa.EncryptPKCS1v15(rand.Reader, publicKey, plaintext)
    if err != nil {
        fmt.Println("Failed to encrypt data:", err)
        return
    }

    fmt.Printf("Ciphertext: %x
", ciphertext)
}

package main

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

func main() {
    // 加载私钥文件
    privateKeyFile, err := os.Open("private.key")
    if err != nil {
        fmt.Println("Failed to open private key file:", err)
        return
    }
    defer privateKeyFile.Close()

    privateKeyData, err := ioutil.ReadAll(privateKeyFile)
    if err != nil {
        fmt.Println("Failed to read private key file:", err)
        return
    }

    privateKeyBlock, _ := pem.Decode(privateKeyData)
    if privateKeyBlock == nil {
        fmt.Println("Failed to decode private key")
        return
    }

    privateKey, err := x509.ParsePKCS1PrivateKey(privateKeyBlock.Bytes)
    if err != nil {
        fmt.Println("Failed to parse private key:", err)
        return
    }

    // 解密数据
    ciphertext := []byte{...} // 输入待解密的密文
    plaintext, err := rsa.DecryptPKCS1v15(rand.Reader, privateKey, ciphertext)
    if err != nil {
        fmt.Println("Failed to decrypt data:", err)
        return
    }

    fmt.Printf("Plaintext: %s
", plaintext)
}