go语言渐入佳境-网络[13]-rsa

rsa公钥加密

产生公钥私钥并存入文件中。

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/* GenRSAKeys
*/

package main

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

func main() {
reader := rand.Reader
bitSize := 512
key, err := rsa.GenerateKey(reader, bitSize)
checkError(err)

fmt.Println("Private key primes", key.Primes[0].String(), key.Primes[1].String())
fmt.Println("Private key exponent", key.D.String())

publicKey := key.PublicKey
fmt.Println("Public key modulus", publicKey.N.String())
fmt.Println("Public key exponent", publicKey.E)

saveGobKey("private.key", key)
saveGobKey("public.key", publicKey)

savePEMKey("private.pem", key)
}

func saveGobKey(fileName string, key interface{}) {
outFile, err := os.Create(fileName)
checkError(err)
encoder := gob.NewEncoder(outFile)
err = encoder.Encode(key)
checkError(err)
outFile.Close()
}

func savePEMKey(fileName string, key *rsa.PrivateKey) {

outFile, err := os.Create(fileName)
checkError(err)

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

pem.Encode(outFile, privateKey)

outFile.Close()
}

func checkError(err error) {
if err != nil {
fmt.Println("Fatal error ", err.Error())
os.Exit(1)
}
}

反向读取

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/* LoadRSAKeys
*/

package main

import (
"crypto/rsa"
"encoding/gob"
"fmt"
"os"
)

func main() {
var key rsa.PrivateKey
loadKey("private.key", &key)

fmt.Println("Private key primes", key.Primes[0].String(), key.Primes[1].String())
fmt.Println("Private key exponent", key.D.String())

var publicKey rsa.PublicKey
loadKey("public.key", &publicKey)

fmt.Println("Public key modulus", publicKey.N.String())
fmt.Println("Public key exponent", publicKey.E)
}

func loadKey(fileName string, key interface{}) {
inFile, err := os.Open(fileName)
checkError(err)
decoder := gob.NewDecoder(inFile)
err = decoder.Decode(key)
checkError(err)
inFile.Close()
}

func checkError(err error) {
if err != nil {
fmt.Println("Fatal error ", err.Error())
os.Exit(1)
}
}