android 文件加密解决方法,如何在Android中加密和解密文件？

我有类似的问题，加密/解密我提出了这个解决方案：

public static byte[] generateKey(String password) throws Exception

{

byte[] keyStart = password.getBytes("UTF-8");

KeyGenerator kgen = KeyGenerator.getInstance("AES");

SecureRandom sr = SecureRandom.getInstance("SHA1PRNG""Crypto");

sr.setSeed(keyStart);

kgen.init(128sr);

SecretKey skey = kgen.generateKey();

return skey.getEncoded();

}

public static byte[] encodeFile(byte[] keybyte[] fileData) throws Exception

{

SecretKeySpec skeySpec = new SecretKeySpec(key"AES");

Cipher cipher = Cipher.getInstance("AES");

cipher.init(Cipher.ENCRYPT_MODEskeySpec);

byte[] encrypted = cipher.doFinal(fileData);

return encrypted;

}

public static byte[] decodeFile(byte[] keybyte[] fileData) throws Exception

{

SecretKeySpec skeySpec = new SecretKeySpec(key"AES");

Cipher cipher = Cipher.getInstance("AES");

cipher.init(Cipher.DECRYPT_MODEskeySpec);

byte[] decrypted = cipher.doFinal(fileData);

return decrypted;

}

要将加密文件保存到sd，请执行以下操作：

File file = new File(Environment.getExternalStorageDirectory() + File.separator + "your_folder_on_sd""file_name");

BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file));

byte[] yourKey = generateKey("password");

byte[] filesBytes = encodeFile(yourKeyyourByteArrayContainigDataToEncrypt);

bos.write(fileBytes);

bos.flush();

bos.close();

解码文件使用：

byte[] yourKey = generateKey("password");

byte[] decodedData = decodeFile(yourKeybytesOfYourFile);

对于将文件读入字节数组，有不同的方法。例如：http：//examples.javacodegeeks.com/core-java/io/fileinputstream/read-file-in-byte-array-with-fileinputstream/