直到kitkat,加密/解密工作正常,但在棒棒糖中它只解密部分数据。
我没有加密问题,因为我用棒棒糖加密文件并用kitkat解密它工作正常但反之亦然。
这是代码。
加密代码
Encrypt(BufferedInputStream is, File destfile, String passcode) {
bis = is;
try {
fos = new FileOutputStream(destfile);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
dest = new BufferedOutputStream(fos, 1024);
this.passcode = passcode;
}
static void encrypt() throws IOException, NoSuchAlgorithmException,
NoSuchPaddingException, InvalidKeyException {
// Length is 16 byte
SecretKeySpec sks = new SecretKeySpec(passcode.getBytes(), "AES");
// Create cipher
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, sks);
// Wrap the output stream
CipherOutputStream cos = new CipherOutputStream(fos, cipher);
// Write bytes
int b;
byte[] d = new byte[1024];
while ((b = bis.read(d)) != -1) {
cos.write(d, 0, b);
}
// Flush and close streams.
cos.flush();
cos.close();
bis.close();
}
解密代码
public Decrypt(String path, String pathcode) {
// TODO Auto-generated constructor stub
filepath = path;
try {
fis = new FileInputStream(new File(path));
this.passcode = pathcode;
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
static String decrypt() throws IOException, NoSuchAlgorithmException,
NoSuchPaddingException, InvalidKeyException {
SecretKeySpec sks = new SecretKeySpec(passcode.getBytes(), "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE, sks);
CipherInputStream cis = new CipherInputStream(fis, cipher);
int size = fis.available();
byte[] resdata = new byte[size];
cis.read(resdata, 0, size);
String newres = new String(resdata, "UTF-8").trim();
//write("decrypted_file.xhtml",newres);
if(fis!=null)
{
fis.close();
}
if(cis!=null)
cis.close();
return newres;
}
此代码中的问题是什么?我还需要做更多其他事情吗?
答案 0 :(得分:2)
available()
不一定返回整个流的长度,只是可以无阻塞地读取的估计字节数。因此,使用ByteArrayOutputStream
来存储字节,然后转换为字节数组:
CipherInputStream cis = new CipherInputStream(fis, cipher);
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
int bytesRead;
byte[] data = new byte[1024];
while ((bytesRead = cis.read(data, 0, data.length)) != -1) {
buffer.write(data, 0, bytesRead);
}
buffer.flush();
byte[] resdata = buffer.toByteArray();
String newres = new String(resdata, "UTF-8").trim();