Android RSA和node.js RSA加密/解密

Question

我目前在服务器上解密RSA加密的数据时遇到问题，该服务器正在使用node.js并使用node-rsa库进行加密/解密。

我的Android客户端上收到的公钥没有任何问题，但是当尝试解密数据时，出现以下异常：

TypeError: Cannot call method 'toString' of null
    at NodeRSA.module.exports.NodeRSA.$getDecryptedData (C:\src\qteddev\node\nod
e_modules\node-rsa\src\NodeRSA.js:283:27)
    at NodeRSA.module.exports.NodeRSA.decrypt (C:\src\qteddev\node\node_modules\
node-rsa\src\NodeRSA.js:170:21)
    at IncomingMessage.<anonymous> (C:\src\qteddev\node\main.js:187:36)
    at IncomingMessage.emit (events.js:92:17)
    at _stream_readable.js:929:16
    at process._tickCallback (node.js:419:13)

这就是我在客户端上生成PublicKey的方式

public static void getPublicKeyFromPemFormat(String PEMString,
                                                       boolean isFilePath) throws IOException, NoSuchAlgorithmException,
            InvalidKeySpecException {

        BufferedReader pemReader = null;
        if (isFilePath) {
            pemReader = new BufferedReader(new InputStreamReader(
                    new FileInputStream(PEMString)));
        } else {
            pemReader = new BufferedReader(new InputStreamReader(
                    new ByteArrayInputStream(PEMString.getBytes("UTF-8"))));
        }
        StringBuffer content = new StringBuffer();
        String line = null;
        while ((line = pemReader.readLine()) != null) {
            if (line.indexOf("-----BEGIN PUBLIC KEY-----") != -1) {
                while ((line = pemReader.readLine()) != null) {
                    if (line.indexOf("-----END PUBLIC KEY") != -1) {
                        break;
                    }
                    content.append(line.trim());
                }
                break;
            }
        }
        if (line == null) {
            throw new IOException("PUBLIC KEY" + " not found");
        }
        Log.i("PUBLIC KEY: ", "PEM content = : " + content.toString());

        KeyFactory keyFactory = KeyFactory.getInstance("RSA");

        publicKey = keyFactory.generatePublic(new X509EncodedKeySpec(Base64.decode(content.toString(), Base64.DEFAULT)));
        //Log.i("GENERATED EXPONENT AND MODULUS = ", publicKey.toString());
    }

这是客户端的加密：

cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, QtedEncryption.publicKey);
cipherData = cipher.doFinal(password.getBytes());
password = Base64.encodeToString(cipherData, Base64.DEFAULT);

然后通过POST请求将密码发送到服务器。

var password = key.decrypt(requestData.password,'utf8');

使用此代码启动服务器时会生成公钥和私钥

var rsa = require('node-rsa');

//create RSA-key
var key = new rsa({b: 1024}); 
console.log(key.getPrivatePEM());
console.log(key.getPublicPEM());

Answer 1

尝试Cipher.getInstance("RSA/ECB/OAEPWithSHA1AndMGF1Padding"); 代替。 'node-rsa'似乎默认为OAEP填充，当前您根本没有使用RSA填充方案。