无法使用Cipher类解密文件

我想基于密码加密文件，所以我使用了以下代码：

private void encrypt(String password) { SecretKeyFactory f = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1"); KeySpec ks = new PBEKeySpec( password.toCharArray(), "salt".getBytes(), 1024, 256 ); SecretKey s = f.generateSecret(ks); java.security.Key key = new SecretKeySpec(s.getEncoded(), "AES/CBC/PKCS5Padding"); InputStream input = new FileInputStream("PATH_TO_IMAGE"); BufferedInputStream bis = new BufferedInputStream(input); FileOutputStream fos = new FileOutputStream("PATH_TO_ENCRYPTED_FILE"); BufferedOutputStream bos = new BufferedOutputStream(fos); Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); cipher.init(Cipher.ENCRYPT_MODE, key); byte[] buff = new byte[32 * 1024]; CipherOutputStream output = new CipherOutputStream(bos, cipher); int len; while ((len = bis.read(buff)) > 0) { output.write(buff, 0, len); } output.flush(); // closing streams ... } 

它运行正常并且创建了加密文件，但是当我尝试解密加密文件时，我Error while finalizing cipher遇到了Error while finalizing cipher 。 解密方法是：

 private void decrypt(String password) { SecretKeyFactory f = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1"); KeySpec ks = new PBEKeySpec( password.toCharArray(), "salt".getBytes(), 1024, 256 ); SecretKey s = f.generateSecret(ks); java.security.Key key = new SecretKeySpec(s.getEncoded(), "AES/CBC/PKCS5Padding"); Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); cipher.init(Cipher.DECRYPT_MODE, key); InputStream inputStream = new FileInputStream("PATH_TO_ENCRYPTED_FILE"); CipherInputStream input = new CipherInputStream(inputStream, cipher); byte[] data = inputStreamToByteArray(input); bitmap = BitmapFactory.decodeByteArray(data, 0, data.length); // closing streams ... } public static byte[] inputStreamToByteArray(CipherInputStream inputStream) throws IOException { ByteArrayOutputStream baos = new ByteArrayOutputStream(); byte[] buffer = new byte[1024]; int len; while ((len = inputStream.read(buffer)) > -1) { baos.write(buffer, 0, len); } baos.flush(); try { return baos.toByteArray(); } finally { baos.close(); } } 

编辑堆栈跟踪：

 05-27 19:51:02.226 2683-2719/? E/MYAPP﹕ exception java.io.IOException: Error while finalizing cipher at javax.crypto.CipherInputStream.fillBuffer(CipherInputStream.java:104) at javax.crypto.CipherInputStream.read(CipherInputStream.java:155) at java.io.InputStream.read(InputStream.java:162) at github.yaa110.gallery.PrivatePlus.inputStreamToByteArray(PrivatePlus.java:163) at github.yaa110.gallery.thread.BitmapLoader.run(BitmapLoader.java:55) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) at java.lang.Thread.run(Thread.java:818) Caused by: javax.crypto.BadPaddingException: EVP_CipherFinal_ex at com.android.org.conscrypt.NativeCrypto.EVP_CipherFinal_ex(Native Method) at com.android.org.conscrypt.OpenSSLCipher.doFinalInternal(OpenSSLCipher.java:430) at com.android.org.conscrypt.OpenSSLCipher.engineDoFinal(OpenSSLCipher.java:490) at javax.crypto.Cipher.doFinal(Cipher.java:1314) at javax.crypto.CipherInputStream.fillBuffer(CipherInputStream.java:102)            at javax.crypto.CipherInputStream.read(CipherInputStream.java:155)            at java.io.InputStream.read(InputStream.java:162)            at github.yaa110.gallery.PrivatePlus.inputStreamToByteArray(PrivatePlus.java:163)            at github.yaa110.gallery.thread.BitmapLoader.run(BitmapLoader.java:55)            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)            at java.lang.Thread.run(Thread.java:818) 

Answer 1

尝试

 while ((len = bis.read(buff)) > 0) { if(input.available() == 0){ // use descryped file here // you can use callback methods } output.write(buff, 0, len); } 

在这里，输入流不断降低其可用性，但它也会在0之后尝试。 因为你没有使用cipher.doFinal（fileData.getBytes（））。