java RSA 產生公開金鑰私密金鑰，javarsa產生

java RSA 產生公開金鑰私密金鑰，javarsa產生

/** * 引進的包都是Java內建的jar包 * 秘鑰相關包 * base64 編解碼 * 這裡只用到了編碼 */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";    //獲得公開金鑰    public static String getPublicKey(Map<String, Object> keyMap) throws Exception {        //獲得map中的公開金鑰對象 轉為key對象        Key key = (Key) keyMap.get(PUBLIC_KEY);        //byte[] publicKey = key.getEncoded();        //編碼返回字串        return encryptBASE64(key.getEncoded());    }    //獲得私密金鑰    public static String getPrivateKey(Map<String, Object> keyMap) throws Exception {        //獲得map中的私密金鑰對象 轉為key對象        Key key = (Key) keyMap.get(PRIVATE_KEY);        //byte[] privateKey = key.getEncoded();        //編碼返回字串        return encryptBASE64(key.getEncoded());    }    //解碼返回byte    public static byte[] decryptBASE64(String key) throws Exception {        return (new BASE64Decoder()).decodeBuffer(key);    }    //編碼返回字串    public static String encryptBASE64(byte[] key) throws Exception {        return (new BASE64Encoder()).encodeBuffer(key);    }        //map對象中存放公私密金鑰    public static Map<String, Object> initKey() throws Exception {        //獲得對象 KeyPairGenerator 參數 RSA 1024個位元組        KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);        keyPairGen.initialize(1024);        //通過對象 KeyPairGenerator 擷取對象KeyPair        KeyPair keyPair = keyPairGen.generateKeyPair();                //通過對象 KeyPair 擷取RSA公私密金鑰對象RSAPublicKey RSAPrivateKey        RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();        RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();        //公私密金鑰對象存入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();        }    }