//作者：贤冰import org.apache.commons.codec.binary.base64;import javax.crypto.Cipher;import java.nio.charset.StandardCharsets;import java.security.*;import java.security.interfaces.RSAPrivateKey;import java.security.interfaces.RSAPublicKey;import java.security.spec.PKCS8EncodedKeySpec;import java.security.spec.X509EncodedKeySpec;public class RsaUtil { public static void main(String[] args) throws Exception { try { KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA"); keyPairGen.initialize(512, new SecureRandom()); KeyPair keyPair = keyPairGen.generateKeyPair(); RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate(); RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic(); //公钥 String publicKeyString = new String(base64.encodebase64(publicKey.getEncoded())); //私钥 String privateKeyString = new String(base64.encodebase64(privateKey.getEncoded())); System.out.println("公钥: " + publicKeyString); System.out.println("私钥: " + privateKeyString); String encrypted = publicKeyEncrypt("hello world", publicKeyString); System.out.println(encrypted); System.out.println(privateKeyDecrypt(encrypted,privateKeyString)); System.out.println(); } catch (NoSuchAlgorithmException e) { System.out.println(e.getMessage()); } } //公钥加密 public static String publicKeyEncrypt(String data, String publicKeyString) throws Exception { byte[] decoded = base64.decodebase64(publicKeyString); RSAPublicKey pubKey = (RSAPublicKey) KeyFactory.getInstance("RSA").generatePublic(new X509EncodedKeySpec(decoded)); Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.ENCRYPT_MODE,pubKey); return base64.encodebase64String(cipher.doFinal(data.getBytes(StandardCharsets.UTF_8))); } //私钥解密 public static String privateKeyDecrypt(String encrypted, String privateKeyString) throws Exception { byte[] inputByte = base64.decodebase64(encrypted.getBytes(StandardCharsets.UTF_8)); byte[] decodedPrivKey = base64.decodebase64(privateKeyString); RSAPrivateKey privKey = (RSAPrivateKey) KeyFactory.getInstance("RSA").generatePrivate(new PKCS8EncodedKeySpec(decodedPrivKey)); Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.DECRYPT_MODE,privKey); return new String(cipher.doFinal(inputByte)); }}
生成密钥公钥普通模式: MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAOSLZ6k5g5GevISr6mh3/vpXuJVD/XabavEu+AXQCBciQnGD9bShBrh4ePU2jrvbIkjtQfxZDSLdrzgyojl1YsECAwEAAQ==私钥普通模式: MIIBVQIBADANBgkqhkiG9w0BAQEFAASCAT8wggE7AgEAAkEA5ItnqTmDkZ68hKvqaHf++le4lUP9dptq8S74BdAIFyJCcYP1tKEGuHh49TaOu9siSO1B/FkNIt2vODKiOXViwQIDAQABAkEAjulRT/OD/0oojjnGYb8vdTHnXYdfdoxnChwZweC9PmDiSym33IZT7glhDTwp4WEiBUaBsl3EElXEKz/mWRm8ZQIhAPnK7xGsSPYIGSBn5H6r6n5e+MC2P40It5aSW10JcnCrAiEA6jlM0KdMf+EyCygYmp58T1eaEfzoxDKmVwJuNTiBskMCIQDcVm51R2SAaXpIhHwgZGMPH5UK4HfEXwkaL3WZ5qhkywIgX+J3NM/YPF2nS/PtJpcM0rpNA2Iis/b8K5B+J2FrjtsCIAN8l/r4p6/u1utyl4G5+878L54iKdWvDJdK8MsXQYxM
Java公钥加密public static String publicKeyEncrypt(String data, String publicKeyString) throws Exception { byte[] decoded = base64.decodebase64(publicKeyString); RSAPublicKey pubKey = (RSAPublicKey) KeyFactory.getInstance("RSA").generatePublic(new X509EncodedKeySpec(decoded)); Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.ENCRYPT_MODE,pubKey); return base64.encodebase64String(cipher.doFinal(data.getBytes(StandardCharsets.UTF_8)));}
Java私钥解密//私钥解密public static String privateKeyDecrypt(String encrypted, String privateKeyString) throws Exception { byte[] inputByte = base64.decodebase64(encrypted.getBytes(StandardCharsets.UTF_8)); byte[] decodedPrivKey = base64.decodebase64(privateKeyString); RSAPrivateKey privKey = (RSAPrivateKey) KeyFactory.getInstance("RSA").generatePrivate(new PKCS8EncodedKeySpec(decodedPrivKey)); Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.DECRYPT_MODE,privKey); return new String(cipher.doFinal(inputByte));}
Java生成的密钥，在Go和PHP中使用时，需要补上Pem格式的前缀和后缀#公钥格式"-----BEGIN PUBLIC KEY-----n%sn-----END PUBLIC KEY-----"#私钥格式"-----BEGIN PRIVATE KEY-----n%sn-----END PRIVATE KEY-----"
二，GO使用Java生成的RSA密钥对 进行加密、解密//作者：贤冰package mainimport ("crypto/rand""crypto/rsa""crypto/x509""encoding/base64""encoding/pem""errors""fmt")type RsaCrypto struct { publicKey []byte privateKey []byte}func NewRsa(pubKey, privKey string) *RsaCrypto { return &RsaCrypto{ publicKey: []byte(fmt.Sprintf("-----BEGIN PUBLIC KEY-----n%sn-----END PUBLIC KEY-----", pubKey)), privateKey: []byte(fmt.Sprintf("-----BEGIN PRIVATE KEY-----n%sn-----END PRIVATE KEY-----", privKey)), }}// 公钥加密func (rc *RsaCrypto) PublicKeyEncrypt(data []byte) ([]byte, error) { block, _ := pem.Decode(rc.publicKey) if block == nil { return nil, errors.New("public key error") } pubInterface, err := x509.ParsePKIXPublicKey(block.Bytes) if err != nil { return nil, err } pub := pubInterface.(*rsa.PublicKey) return rsa.EncryptPKCS1v15(rand.Reader, pub, data)}// 私钥解密func (rc *RsaCrypto) PrivateKeyDecrypt(encrypted []byte) ([]byte, error) { block, _ := pem.Decode(rc.privateKey) if block == nil { return nil, errors.New("private key error!") } privInterface, err := x509.ParsePKCS8PrivateKey(block.Bytes) if err != nil { return nil, err } priv := privInterface.(*rsa.PrivateKey) return rsa.DecryptPKCS1v15(rand.Reader, priv, encrypted)}func main() { javaPublic := "MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAOSLZ6k5g5GevISr6mh3/vpXuJVD/XabavEu+AXQCBciQnGD9bShBrh4ePU2jrvbIkjtQfxZDSLdrzgyojl1YsECAwEAAQ==" javaPrivate := "MIIBVQIBADANBgkqhkiG9w0BAQEFAASCAT8wggE7AgEAAkEA5ItnqTmDkZ68hKvqaHf++le4lUP9dptq8S74BdAIFyJCcYP1tKEGuHh49TaOu9siSO1B/FkNIt2vODKiOXViwQIDAQABAkEAjulRT/OD/0oojjnGYb8vdTHnXYdfdoxnChwZweC9PmDiSym33IZT7glhDTwp4WEiBUaBsl3EElXEKz/mWRm8ZQIhAPnK7xGsSPYIGSBn5H6r6n5e+MC2P40It5aSW10JcnCrAiEA6jlM0KdMf+EyCygYmp58T1eaEfzoxDKmVwJuNTiBskMCIQDcVm51R2SAaXpIhHwgZGMPH5UK4HfEXwkaL3WZ5qhkywIgX+J3NM/YPF2nS/PtJpcM0rpNA2Iis/b8K5B+J2FrjtsCIAN8l/r4p6/u1utyl4G5+878L54iKdWvDJdK8MsXQYxM" data := "hello rsa" rsaCrypto := NewRsa(javaPublic, javaPrivate) encrypted, err := rsaCrypto.PublicKeyEncrypt([]byte(data)) if err != nil { panic(err) } fmt.Println("公钥加密:", base64.StdEncoding.EncodeToString(encrypted)) decrypted, err := rsaCrypto.PrivateKeyDecrypt(encrypted) if err != nil { panic(err) } fmt.Println("私钥解密:", string(decrypted))}
三，PHP使用Java生成的RSA密钥对 进行加密、解密<?php//作者：贤冰class RsaCrypto { private static $_instance = null; protected $publicKey = ''; protected $privateKey = ''; public function __construct($pubKey, $privKey) { $this->publicKey = $pubKey; $this->privateKey = $privKey; } public static function getInstance($pubKey, $privKey) { if(self::$_instance!=null){ return self::$_instance; } self::$_instance = new self($pubKey, $privKey); return self::$_instance; } public static function formatPublicKey($pubKey) : string { return sprintf("-----BEGIN PUBLIC KEY-----n%sn-----END PUBLIC KEY-----",$pubKey); } public static function formatPrivateKey($privKey) : string { return sprintf("-----BEGIN PRIVATE KEY-----n%sn-----END PRIVATE KEY-----",$privKey); } //公钥加密 public function publicKeyEncrypt($data) : string { if(openssl_public_encrypt($data, $encrypted, $this->publicKey)){ return base64_encode($encrypted); } return ""; } //私钥解密 public function privateKeyDecrypt($encrypted) : string { if(openssl_private_decrypt(base64_decode($encrypted), $decrypted, $this->privateKey)){ return $decrypted; } return ""; }}$javaPublic = 'MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAOSLZ6k5g5GevISr6mh3/vpXuJVD/XabavEu+AXQCBciQnGD9bShBrh4ePU2jrvbIkjtQfxZDSLdrzgyojl1YsECAwEAAQ==';$javaPrivate = 'MIIBVQIBADANBgkqhkiG9w0BAQEFAASCAT8wggE7AgEAAkEA5ItnqTmDkZ68hKvqaHf++le4lUP9dptq8S74BdAIFyJCcYP1tKEGuHh49TaOu9siSO1B/FkNIt2vODKiOXViwQIDAQABAkEAjulRT/OD/0oojjnGYb8vdTHnXYdfdoxnChwZweC9PmDiSym33IZT7glhDTwp4WEiBUaBsl3EElXEKz/mWRm8ZQIhAPnK7xGsSPYIGSBn5H6r6n5e+MC2P40It5aSW10JcnCrAiEA6jlM0KdMf+EyCygYmp58T1eaEfzoxDKmVwJuNTiBskMCIQDcVm51R2SAaXpIhHwgZGMPH5UK4HfEXwkaL3WZ5qhkywIgX+J3NM/YPF2nS/PtJpcM0rpNA2Iis/b8K5B+J2FrjtsCIAN8l/r4p6/u1utyl4G5+878L54iKdWvDJdK8MsXQYxM';$data = 'hello rsa';$rsaCrypto = RsaCrypto::getInstance(RsaCrypto::formatPublicKey($javaPublic),RsaCrypto::formatPrivateKey($javaPrivate));//公钥加密$encrypted = $rsaCrypto->publicKeyEncrypt($data);echo sprintf("加密后: %sn",$encrypted);//私钥解密echo sprintf("解密后: %sn",$rsaCrypto->privateKeyDecrypt($encrypted));?>