我正在尝试解密我在其他地方加密的字符串。这是我的代码:
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 下以我希望的方式 100% 工作，但是当我在 Android 模拟器中运行它时，我得到:
我认为我的问题归结为编码，但我已经花了一整天的时间试图找出真正难倒的东西。
该字符串最初是使用以下方法加密的:
private void test() {
String message="22223334490384903432221";
try {
//Encrypt message
byte[] encryptedMsg = Base64.encodeBase64(encryptString(message, temp.loadCASPublicKey()));
} catch (Exception e) {
e.printStackTrace();
return;
}
}
private static byte[] encryptString(String message, Key publicKey) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException {
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
byte[] cipherData = cipher.doFinal(message.getBytes("UTF-8"));
return cipherData;
}
最佳答案
由于您正在读入一个 2000 字节的数组，因此您可能会提供 KeyFactory 垃圾，并且您的 key 可能是 128(1024 位)或 256(2048 位)字节长。此外，您不应该真正直接使用 RSA 进行加密:这存在安全问题，您可以加密的数据大小受 RSA key 大小的限制。
关于java - RSA解密的Android/JVM差异，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/10306560/