java-RSA 生成秘鑰和公鑰

//加密方式
    public static final String KEY_ALGORITHM = "RSA";
    //公鑰
    public static final String PUBLIC_KEY = "RSAPublicKey";
    //私鑰
    public static final String PRIVATE_KEY = "RSAPrivateKey";
    
    public static void main(String[] args) {
        
        Map<String, Object> map;
        try {
            map=initKey();
            String publicKey = getPublicKey(map);
            System.out.println(publicKey);
            String privateKey = getPrivateKey(map);
            System.out.println(privateKey);
        } catch (Exception e) {
            e.printStackTrace();
        }
        
    }
    /**
     * 獲取公鑰
     * @param keyMap
     * @return
     */
    public static String getPublicKey(Map<String, Object> keyMap){
        //獲取map中的公鑰轉化為key對象
       Key key = (Key) keyMap.get(PUBLIC_KEY);
       return encryptBASE64(key.getEncoded());
    }

    
    /**
     * {@link Map}
     * map中存放私鑰和公鑰
     * @return
     * @throws Exception
     */
    public static Map<String, Object> initKey() throws Exception{
        //獲得對象 KeyPairGenerator 參數 RSA 1024個字節
        KeyPairGenerator key = KeyPairGenerator.getInstance(KEY_ALGORITHM);
        key.initialize(1024);//這個地方官方文檔說的必須初始化 可以參考一下jdk1.8官方文檔
        KeyPair generateKeyPair = key.generateKeyPair();
      //通過對象 KeyPair 獲取RSA公私鑰對象RSAPublicKey RSAPrivateKey
        RSAPublicKey publicKey = (RSAPublicKey) generateKeyPair.getPublic();
        RSAPrivateKey privateKey = (RSAPrivateKey) generateKeyPair.getPrivate();
        Map<String, Object> map =  new HashMap<String, Object>(2);
        map.put(PUBLIC_KEY, publicKey);
        map.put(PRIVATE_KEY, privateKey);
        return map;
    }
    
    /**
     * 獲取私鑰
     * @param keyMap
     * @return
     */
    public static String getPrivateKey(Map<String, Object> keyMap){
        //獲取map中的公鑰轉化為key對象
       Key key = (Key) keyMap.get(PRIVATE_KEY);
       return encryptBASE64(key.getEncoded());
    }

    /**
     * 解碼返回字節數組
     * @param key
     * @return
     * @throws IOException
     */
    public static byte[] decryptBASE64(String key) throws IOException {
        return new BASE64Decoder().decodeBuffer(key);
    }
    /**
     * 編碼返回字符串
     * @param encoded
     * @return
     */
    public static String encryptBASE64(byte[] encoded) {
        return new BASE64Encoder().encodeBuffer(encoded);
    }