[英]Socket Programming java - encryption File
我正在发送(加密并发送文件)并通过套接字接收文件:
我的服务器代码:
private void send(OutputStream op,
FileInputStream filetoprocess, long l) throws Throwable {
Cipher ecipher;
byte[] inputBytes = new byte[(int) l];
filetoprocess.read(inputBytes);
byte[] ivBytes = "1234567812345678".getBytes();
DESKeySpec desKeySpec = new DESKeySpec(ivBytes);
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey sKey = keyFactory.generateSecret(desKeySpec);
ecipher.init(Cipher.ENCRYPT_MODE, sKey);
byte[] outputBytes = ecipher.doFinal(inputBytes);
op.write(outputBytes);
op.flush();
System.out.println("File sent");
}
我的接收代码(在客户端):
private static void receive(InputStream ip, File fname,
PrintWriter output2) throws Throwable {
byte[] ivBytes = "1234567812345678".getBytes();
Cipher dcipher ;
DESKeySpec desKeySpec = new DESKeySpec(ivBytes);
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey sKey = keyFactory.generateSecret(desKeySpec);
dcipher = Cipher.getInstance("DES");
dcipher.init(Cipher.DECRYPT_MODE, sKey);
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int length;
while ((length = ip.read(buffer)) != -1)
{
out.write(buffer, 0, length);
}
byte[] result = out.toByteArray();
byte[] outputBytes = dcipher.doFinal(result);
FileOutputStream outputStream = new FileOutputStream(fname);
outputStream.write(outputBytes);
outputStream.close();
System.out.println("File received");
}
该文件未在客户端接收,没有异常或没有异常。 客户就在这里停下来。
我在这里做错了什么? 我已经尝试过密码O / I流。 但是我的问题是,在加密时,我需要关闭CipherOutputStream,否则客户端未接收到该文件。 发送文件后,我需要从客户端接收确认,因为我正在关闭服务器中的CipherOutputStream,因此它没有收到来自客户端的消息。 它抛出了Socket关闭异常。
所以我做了一个不同的版本(给出的代码)。 但这也不起作用。 请帮我解决一下这个。
这是带有一些注释的代码,可以帮助您了解问题所在。 请参阅代码中的注释。
public void send( OutputStream op,
FileInputStream filetoprocess,
long l) throws Throwable
{
byte[] inputBytes = new byte[(int) l];
int iRead = filetoprocess.read(inputBytes);
if (iRead != l)
{
System.out.println("Read error.");
return;
}
byte[] ivBytes = "1234567812345678".getBytes();
DESKeySpec desKeySpec = new DESKeySpec(ivBytes);
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey sKey = keyFactory.generateSecret(desKeySpec);
Cipher ecipher = Cipher.getInstance("DES");
ecipher.init(Cipher.ENCRYPT_MODE, sKey);
byte[] outputBytes = ecipher.doFinal(inputBytes);
// Send the file's size, 4 bytes.
// Use an 8 byte buffer to send big files > 2GB.
byte[] fileSize = new byte[4];
fileSize[0] = (byte) ((iRead & 0xff000000) >> 24);
fileSize[1] = (byte) ((iRead & 0x00ff0000) >> 16);
fileSize[2] = (byte) ((iRead & 0x0000ff00) >> 8);
fileSize[3] = (byte) (iRead & 0x000000ff);
op.write(fileSize, 0, 4);
// Now send the file's data
op.write(outputBytes);
op.flush();
System.out.println("File sent");
}
public static void receive(
InputStream ip,
File fname,
PrintWriter output2) throws Throwable
{
byte[] ivBytes = "1234567812345678".getBytes();
DESKeySpec desKeySpec = new DESKeySpec(ivBytes);
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey sKey = keyFactory.generateSecret(desKeySpec);
Cipher dcipher = Cipher.getInstance("DES");
dcipher.init(Cipher.DECRYPT_MODE, sKey);
ByteArrayOutputStream out = new ByteArrayOutputStream();
// Receive the file's size first
byte[] bSize = new byte[4];
ip.read(bSize, 0, 4);
int fileSize=0;
fileSize = (int) (bSize[0]) << 24 | (int) (bSize[1]) << 16 |
(int) (bSize[2]) << 8 | (int) (bSize[3]);
// use a 4 or 8K buffer for better performance
byte[] buffer = new byte[8*1024];
int length;
// Read up to the file size
while (fileSize > 0)
{
if (fileSize > buffer.length) length=buffer.length;
else length=fileSize;
int iRead = ip.read(buffer, 0, length);
if (iRead > 0)
{
out.write(buffer, 0, iRead);
fileSize -= iRead;
}
}
byte[] result = out.toByteArray();
byte[] outputBytes = dcipher.doFinal(result);
FileOutputStream outputStream = new FileOutputStream(fname);
outputStream.write(outputBytes);
outputStream.close();
System.out.println("File received");
}
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