Android的 - 增加了加密速度 [英] Android - Increase speed of encryption

问题描述

我不知道这是可能的......我有在我的应用程序code的加密图像...

I am not sure if this is possible...i have code within my application which encrypts images...

Cipher cipher;
SecretKey key;
byte[] buf = new byte[1024];
DesEncrypter() {
   byte[] iv = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
      0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 };
   key = new SecretKeySpec(iv, "AES");
   try {
     cipher = Cipher.getInstance("AES/ECB/PKCS7Padding", "BC");
     cipher.init(Cipher.ENCRYPT_MODE, key);          
   } 
   catch (NoSuchProviderException e) {}
 }        

public void encrypt(InputStream in, OutputStream out) {
    try {
      out = new CipherOutputStream(out, cipher);
      int numRead = 0;
      while ((numRead = in.read(buf)) >= 0) {
          out.write(buf, 0, numRead);
      }
      out.close();
    } 

我每次加密或解密的图像（其中我的应用程序很多），它需要一个很长的时间，如何提高的过程中，使用户获得更好的体验任何提示？

Every time i encrypt or decrypt an image (which my application does alot) it takes a very long time, any tips on how to increase the process so users have a better experience?

推荐答案

如果你愿意换一个位安全的速度，比你只能加密图像的特定部分，例如：前100个字节，每1000字节的数据流。

If you are willing to trade a bit of security for speed, than you could only encrypt specific parts of the picture: for example first 100 bytes out of every 1000 bytes of datastream.

此外，使用的AsyncTask，作为@Estel建议，让你的UI将不会受到延误。

Also, use AsyncTask, as @Estel suggested, so that your UI won't suffer delays.

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