Android / JVM在RSA解密方面的差异

我试图解密一个字符串，我已在其他地方加密。 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100％在我的桌面JVM下如何工作，但是当我在Android模拟器中运行时，我得到：

04-24 22：42：21.011：I / System.out（1041）： k _ * 93| @0 ̍4 y） Q k ; * A e # A oiu: W5@$ w j w j uS R Ocx＆ l w’/ d 8uA { 4$ U 0 {Ԑ t！9 n a ‘Jdt2 t T D k+k ; GF \ rڼ >] y + ^w < 'E{ 8R] ZHyu ζ 软 ށ掱 { A ＃ȟ

我认为我的问题归结为编码，但我花了一整天时间试图弄清楚什么，我真的很难过。

该字符串最初使用以下加密：

 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; } 

Answer 1

由于您正在读取2000字节数组，因此您可能需要提供KeyFactory垃圾，并且您的密钥可能类似于128（1024位）或256（2048位）字节长。 此外，您不应该直接使用RSA进行加密：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。

Answer 2

感谢GregS在评论中提供的帮助。 这是对我有用的解决方案。

 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; }