DerInputStream.getLength(): lengthTag=111, too big.

问题：DerInputStream.getLength(): lengthTag=111, too big.

原因：使用的公钥不是真正的公钥，而是我自己随便写的简单的字符串

解决：使用真正的公钥解密

byte[] keyBytes = EncryptUtil.rsaEncryptByPublicKey(desKey.getBytes(EncryptUtil.DEFAULT_CHARSET), assetPublicKey);

	/**
	 * RSA公钥加密
	 *
	 * @param data
	 * @param key
	 * @return
	 * @throws Exception
	 */
	public static byte[] rsaEncryptByPublicKey(byte[] data, String key) throws Exception {
		// 对公钥解密
		byte[] keyBytes = decryptBASE64(key);
		// 取得公钥
		X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
		KeyFactory keyFactory = KeyFactory.getInstance(RSA_ALGORITHM);
		Key publicKey = keyFactory.generatePublic(x509KeySpec);
		// 对数据加密
		Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
		cipher.init(Cipher.ENCRYPT_MODE, publicKey);
		return cipher.doFinal(data);
	}