Data must not be longer than 117 bytes异常 RSA对文件进行加密解密内容超长报错

   RSA非对称加密算法，针对大型文本文件进行加解密，需要分段加密和解密   

private static String algorithm = "RSA"; //$NON-NLS-1$

    private static String data = readString("需要加密文件路径");
    private static Map keyMap = new HashMap(); 
    public static void main(String[] args) throws NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, InvalidKeyException, IOException {
        genKeyPair();

        String test = testEncrypt(keyMap.get(1),data);
        String testDecrypt = testDecrypt(keyMap.get(0), test);

        FileOutputStream os = new FileOutputStream("加密后文件输出路径");
        os.write(test.getBytes());
        System.out.println(testDecrypt);

    }
    
    public static void genKeyPair() throws NoSuchAlgorithmException {
        // KeyPairGenerator类用于生成公钥和私钥对，基于RSA算法生成对象
        KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA");
        // 初始化密钥对生成器，密钥大小为96-1024位
        keyPairGen.initialize(1024,new SecureRandom());
        // 生成一个密钥对，保存在keyPair中
        KeyPair keyPair = keyPairGen.generateKeyPair();
        RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();   // 得到私钥
        RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();  // 得到公钥
        String publicKeyString = new String(org.apache.commons.codec.binary.Base64.encodeBase64(publicKey.getEncoded()));
        // 得到私钥字符串
        String privateKeyString = new String(org.apache.commons.codec.binary.Base64.encodeBase64((privateKey.getEncoded())));
        // 将公钥和私钥保存到Map
        keyMap.put(0,publicKeyString);  //0表示公钥
        keyMap.put(1,privateKeyString);  //1表示私钥
    }
    private static String readString(String filePath)
    {
        int len=0;
        StringBuffer str=new StringBuffer("");
        File file=new File(filePath);
        try {
            FileInputStream is=new FileInputStream(file);
            InputStreamReader isr= new InputStreamReader(is);
            BufferedReader in= new BufferedReader(isr);
            String line=null;
            while( (line=in.readLine())!=null )
            {
                if(len != 0) // 处理换行符的问题
                {
                    str.append("\r\n"+line);
                }
                else
                {
                    str.append(line);
                }
                len++;
            }
            in.close();
            is.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return str.toString();
    }

   
    public static String testEncrypt(String key,String data) throws NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, InvalidKeyException, IOException{
        byte[] decode = Base64.getDecoder().decode(key);
        PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(decode);
        KeyFactory kf = KeyFactory.getInstance(algorithm);
        PrivateKey generatePrivate = kf.generatePrivate(pkcs8EncodedKeySpec);
        Cipher ci = Cipher.getInstance(algorithm);
        ci.init(Cipher.ENCRYPT_MODE, generatePrivate);

        byte[] bytes = data.getBytes();
        int inputLen = bytes.length;
        int offLen = 0;
        int i = 0;
        ByteArrayOutputStream bops = new ByteArrayOutputStream();
        while(inputLen - offLen > 0){
            byte [] cache;
            if(inputLen - offLen > 117){
                cache = ci.doFinal(bytes, offLen,117);
            }else{
                cache = ci.doFinal(bytes, offLen,inputLen - offLen);
            }
            bops.write(cache);
            i++;
            offLen = 117 * i;
        }
        bops.close();
        byte[] encryptedData = bops.toByteArray();
        String encodeToString = Base64.getEncoder().encodeToString(encryptedData);
        return encodeToString;
    }

    public static String testDecrypt(String key,String data) throws NoSuchAlgorithmException, InvalidKeyException, NoSuchPaddingException, InvalidKeySpecException, IllegalBlockSizeException, BadPaddingException, IOException{
        byte[] decode = Base64.getDecoder().decode(key);
        X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(decode);
        KeyFactory kf = KeyFactory.getInstance(algorithm);
        PublicKey generatePublic = kf.generatePublic(x509EncodedKeySpec);
        Cipher ci = Cipher.getInstance(algorithm);
        ci.init(Cipher.DECRYPT_MODE,generatePublic);

        byte[] bytes = Base64.getDecoder().decode(data);
        int inputLen = bytes.length;
        int offLen = 0;
        int i = 0;
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        while(inputLen - offLen > 0){
            byte[] cache;
            if(inputLen - offLen > 128){
                cache = ci.doFinal(bytes,offLen,128);
            }else{
                cache = ci.doFinal(bytes,offLen,inputLen - offLen);
            }
            byteArrayOutputStream.write(cache);
            i++;
            offLen = 128 * i;

        }
        byteArrayOutputStream.close();
        byte[] byteArray = byteArrayOutputStream.toByteArray();
        return new String(byteArray);
    }