java RSA 生成公钥私钥

/**
 * 引进的包都是Java自带的jar包
 * 秘钥相关包
 * base64 编解码
 * 这里只用到了编码
 */
import java.security.Key;
import java.security.KeyPair; import java.security.KeyPairGenerator; import java.security.interfaces.RSAPrivateKey; import java.security.interfaces.RSAPublicKey; import java.util.HashMap; import java.util.Map; import sun.misc.BASE64Decoder; import sun.misc.BASE64Encoder; public class CreateSecrteKey { public class Keys { } public static final String KEY_ALGORITHM = "RSA"; //public static final String SIGNATURE_ALGORITHM = "MD5withRSA"; private static final String PUBLIC_KEY = "RSAPublicKey"; private static final String PRIVATE_KEY = "RSAPrivateKey"; //获得公钥 public static String getPublicKey(Map<String, Object> keyMap) throws Exception { //获得map中的公钥对象 转为key对象 Key key = (Key) keyMap.get(PUBLIC_KEY); //byte[] publicKey = key.getEncoded(); //编码返回字符串 return encryptBASE64(key.getEncoded()); } //获得私钥 public static String getPrivateKey(Map<String, Object> keyMap) throws Exception { //获得map中的私钥对象 转为key对象 Key key = (Key) keyMap.get(PRIVATE_KEY); //byte[] privateKey = key.getEncoded(); //编码返回字符串 return encryptBASE64(key.getEncoded()); } //解码返回byte public static byte[] decryptBASE64(String key) throws Exception { return (new BASE64Decoder()).decodeBuffer(key); } //编码返回字符串 public static String encryptBASE64(byte[] key) throws Exception { return (new BASE64Encoder()).encodeBuffer(key); } //map对象中存放公私钥 public static Map<String, Object> initKey() throws Exception { //获得对象 KeyPairGenerator 参数 RSA 1024个字节 KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM); keyPairGen.initialize(1024); //通过对象 KeyPairGenerator 获取对象KeyPair KeyPair keyPair = keyPairGen.generateKeyPair(); //通过对象 KeyPair 获取RSA公私钥对象RSAPublicKey RSAPrivateKey RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic(); RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate(); //公私钥对象存入map中 Map<String, Object> keyMap = new HashMap<String, Object>(2); keyMap.put(PUBLIC_KEY, publicKey); keyMap.put(PRIVATE_KEY, privateKey); return keyMap; } public static void main(String[] args) { Map<String, Object> keyMap; try { keyMap = initKey(); String publicKey = getPublicKey(keyMap); System.out.println(publicKey); String privateKey = getPrivateKey(keyMap); System.out.println(privateKey); } catch (Exception e) { e.printStackTrace(); } }