Java Android/JVM在RSA解密中的差异

我正在尝试解密一个字符串，我在别处加密了这个字符串。这是我的密码：

private void test() {

    try {
        String stringMessage="Sf3O7Lr2+WN5szGyLejL3CjuBRZtQ72+ZBmgVTgWnatQZxUElzaBqFa1p0SVBqe9VWVxCxdEkejMVtDGEr0UJSVSK8EB/fPI6v8JE8dIu0JN0mMs4xlowhITy0tQR+1pcBtDFjzOl33xxQcq5JuPezxRDxFIp+IVkD8FdpqlttEKf2Tvqw9tqsdgiBKb5xDvKrkIDQXdLBh1gbAVZDSJYGHRkcOA8vz2ty/PeooKkfDK6IOn7KBwOBgSRgQr/MLBF3Xk2vRWgVGRh/fRkzu21EWo99Q5moWKxWl3HW/bbgTBQTb097XP3NTID9kSPhCfL0BEfBxonuNse5GBoeRnCw==";
        //Convert String back to Byte[] and decrpt
        byte[] byteMessage = Base64.decodeBase64(stringMessage.getBytes("UTF-8"));
        System.out.println("ENCRYPTED MESSAGE byte Length: "+byteMessage.length);

        String decryptedMsg = decryptString(byteMessage, loadCASPrivateKey());
        System.out.println(decryptedMsg);
    } catch (Exception e) {
        e.printStackTrace();
        return;
    }
}

private static String decryptString(byte[] message, Key privateKey) throws InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException {
    Cipher cipher = Cipher.getInstance("RSA");
    cipher.init(Cipher.DECRYPT_MODE, privateKey);

    byte[] cipherData = cipher.doFinal(message);
    return new String(cipherData, "UTF-8");
}

private PrivateKey loadCASPrivateKey() throws IOException, NoSuchAlgorithmException, InvalidKeySpecException {
    InputStream is = getClass().getResourceAsStream( "/keys/app-private.key" );
    if (is == null) {
        System.out.println("NULL");
    }
    byte[] encodedPrivateKey = new byte[(int) 2000];
    is.read(encodedPrivateKey);
    is.close();

    // Generate KeyPair.
    KeyFactory keyFactory = KeyFactory.getInstance("RSA");

    PKCS8EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec(encodedPrivateKey);
    PrivateKey privateKey = keyFactory.generatePrivate(privateKeySpec);

    return privateKey;

}

这在我的桌面JVM下100%起作用，但是当我在Android emulator中运行它时，我得到：

04-24 22:42:21.011:I/系统输出（1041）： ��K���_��*�ݣ���93|@0�̍4�y）��Q�K�;*A.����E�<代码>#��A.� �oiu：�����W5@$�W�J��美国�R�Ocxٰ&����L �w'/�D�8uA��ؔ�{�4$�U�0��{Ԑ��t！9��N��

---

��A.��'Jdt2�T�T�D��k+k�;������ ����女朋友��\�rڼ��>]�y+^w� 由于您正在读取一个2000字节的数组，并且您的密钥可能是128位（1024位）或256位（2048位），因此您可能会将

KeyFactory

垃圾送入字节长。此外，您不应该直接使用RSA进行加密：这存在安全问题。您可以加密的数据大小受RSA密钥大小的限制。

多亏了GregS在评论中的帮助。这是一个适合我的解决方案

private void test() {

            try {
                String stringMessage="GEQRpAPA577ks/QveudNkk7H9DjItKGLDYW6xhH1YJGabCVzrkejkBh6S+APwEXxB84UV/q0sO5rqkgXWONJQ8CoMTfqXtUkAAwkYHSc86eGewkM8WpctA0AyNVFonOxDCXm84Uq8JRMzqskSH5VXHmMxvHIvpFgdhmt9Ir0cKWzoLsuvgfY9hfypfEyBXGZcoptQeKhsZxRGIlxbXhrFl/LqhC+F6vYtZ/j5pv2LUP38wh2rTCKnAQ+xvC+7wn5SVzt/Wbr/q7GjCoJuU9uFHQSS49KQDt+BzJL2XNwAMmdbC+XHYkEBBWxVSS+0hdSQxoaKVZZJk4hTnHwQlBAkw==";
                //Convert String back to Byte[] and decrpt
                byte[] byteMessage = Base64.decodeBase64(stringMessage.getBytes("UTF-8"));
                System.out.println("ENCRYPTED MESSAGE byte Length: "+byteMessage.length);

                String decryptedMsg = decryptString(byteMessage, loadCASPrivateKey());
                System.out.println(decryptedMsg);
            } catch (Exception e) {
                e.printStackTrace();
                return;
            }
        }

        private static String decryptString(byte[] message, Key privateKey) throws InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException, NoSuchProviderException {
            Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

            Cipher cipher = Cipher.getInstance("RSA/None/NoPadding","BC");
            cipher.init(Cipher.DECRYPT_MODE, privateKey);

            byte[] cipherData = cipher.doFinal(message);
            return new String(cipherData, "UTF-8");
        }

        private PrivateKey loadCASPrivateKey() throws IOException, NoSuchAlgorithmException, InvalidKeySpecException {
            InputStream is = getClass().getResourceAsStream( "/keys/app-private.key" );
            if (is == null) {
                System.out.println("NULL");
            }
            byte[] encodedPrivateKey = new byte[(int) 1216];
            is.read(encodedPrivateKey);
            is.close();

            // Generate KeyPair.
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");

            PKCS8EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec(encodedPrivateKey);
            PrivateKey privateKey = keyFactory.generatePrivate(privateKeySpec);

            return privateKey;

        }

---

你会建议我用什么替换字节数组？JVM和Android之间它输入KeyFactory的方式会不同吗？我正在使用RSA加密固定长度的随机散列。谢谢。读取流并只使用文件/资产中的字节数。不确定你想做什么，但加密散列通常被称为“签名”并使用私钥完成，并使用公钥验证。您在桌面上使用的JCE提供程序和Java版本是什么？请列出所有不使用默认值的算法，尝试查找支持哪些RSA密码。它们在不同的平台上可能不同。

Cipher.getInstance（）

接受一个由算法/模式/填充组成的字符串参数。您只提供了算法，并获得了其他两个的默认值。此外，您需要显示

encryptString

方法，以便我们可以将其与

decryptString

方法进行比较。@GregS-谢谢。我已经添加了encryptString部分。我将研究密码r、 getInstance，我没有意识到它包含了更多的部分。@GregS-我已经查看并尝试了“RSA/NONE/NoPadding”。但是我得到了一个NoSuchAlgorithmException。修复了它。感谢指针。添加了一个安全提供程序，然后正确地声明了算法/模式/填充。：）

private void test() {

            try {
                String stringMessage="GEQRpAPA577ks/QveudNkk7H9DjItKGLDYW6xhH1YJGabCVzrkejkBh6S+APwEXxB84UV/q0sO5rqkgXWONJQ8CoMTfqXtUkAAwkYHSc86eGewkM8WpctA0AyNVFonOxDCXm84Uq8JRMzqskSH5VXHmMxvHIvpFgdhmt9Ir0cKWzoLsuvgfY9hfypfEyBXGZcoptQeKhsZxRGIlxbXhrFl/LqhC+F6vYtZ/j5pv2LUP38wh2rTCKnAQ+xvC+7wn5SVzt/Wbr/q7GjCoJuU9uFHQSS49KQDt+BzJL2XNwAMmdbC+XHYkEBBWxVSS+0hdSQxoaKVZZJk4hTnHwQlBAkw==";
                //Convert String back to Byte[] and decrpt
                byte[] byteMessage = Base64.decodeBase64(stringMessage.getBytes("UTF-8"));
                System.out.println("ENCRYPTED MESSAGE byte Length: "+byteMessage.length);

                String decryptedMsg = decryptString(byteMessage, loadCASPrivateKey());
                System.out.println(decryptedMsg);
            } catch (Exception e) {
                e.printStackTrace();
                return;
            }
        }

        private static String decryptString(byte[] message, Key privateKey) throws InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException, NoSuchProviderException {
            Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

            Cipher cipher = Cipher.getInstance("RSA/None/NoPadding","BC");
            cipher.init(Cipher.DECRYPT_MODE, privateKey);

            byte[] cipherData = cipher.doFinal(message);
            return new String(cipherData, "UTF-8");
        }

        private PrivateKey loadCASPrivateKey() throws IOException, NoSuchAlgorithmException, InvalidKeySpecException {
            InputStream is = getClass().getResourceAsStream( "/keys/app-private.key" );
            if (is == null) {
                System.out.println("NULL");
            }
            byte[] encodedPrivateKey = new byte[(int) 1216];
            is.read(encodedPrivateKey);
            is.close();

            // Generate KeyPair.
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");

            PKCS8EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec(encodedPrivateKey);
            PrivateKey privateKey = keyFactory.generatePrivate(privateKeySpec);

            return privateKey;

        }