Class ToolRSA

security/src/main/java/pro/tools/security/ToolRSA.java:29–232

RSA安全编码组件 @author SeanDragon

 * @author SeanDragon
 */
public final class ToolRSA {
    private ToolRSA() {
        throw new UnsupportedOperationException("我是工具类，别初始化我。。。");
    }

    /**
     * 非对称加密密钥算法
     */
    public static final String KEY_ALGORITHM = "RSA";

    /**
     * 公钥
     */
    private static final String PUBLIC_KEY = "RSAPublicKey";

    /**
     * 私钥
     */
    private static final String PRIVATE_KEY = "RSAPrivateKey";

    /**
     * RSA密钥长度 默认1024位， 密钥长度必须是64的倍数， 范围在512至65536位之间。
     */
    private static final int KEY_SIZE = 512;

    /**
     * 私钥解密
     *
     * @param data
     *         待解密数据
     * @param key
     *         私钥
     *
     * @return byte[] 解密数据
     *
     * @throws Exception
     */
    public static byte[] decryptByPrivateKey(byte[] data, byte[] key) throws NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
        // 取得私钥
        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(key);

        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);

        // 生成私钥
        PrivateKey privateKey = keyFactory.generatePrivate(pkcs8KeySpec);

        // 对数据解密
        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());

        cipher.init(Cipher.DECRYPT_MODE, privateKey);

        return cipher.doFinal(data);
    }

    /**
     * 公钥解密
     *
     * @param data