我试图从这里收集有关加密/解密的所有可能信息。修补它，一些成功和失败。
但是现在我已经应用了代码以及它的成功和失败。一些文件（exe 或 msi）正在运行，但它们仍然给出有关 BadPaddingException 的错误。此外，其他一些媒体文件，如（mp4、mkv 等），尽管已完全接收，但仍停留在 99% 并且没有超出此范围（只是一些微小的字节差异，但磁盘上的大小始终匹配）。
我只是想要一些帮助来摆脱这两个问题。文件 r 通过套接字编程从一台 PC 传输到另一台 PC。
服务器：（已编辑）
DataInputStream dis = new DataInputStream(msock.getInputStream());
DataOutputStream dos = new DataOutputStream(msock.getOutputStream());
String file2dl = dis.readLine(); //2
File file = new File(sharedDirectory.toString() + "\\" + file2dl);
dos.writeLong(file.length()); //3+
//Get file name without extension.
String fileName = Files.getNameWithoutExtension(file2dl);
//AES-128 bit key initialization.
byte[] keyvalue = "AES128BitPasswd".getBytes();
SecretKey key = new SecretKeySpec(keyvalue, "AES");
//Initialize the Cipher.
Cipher encCipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
encCipher.init(Cipher.ENCRYPT_MODE, key);
//Get the IV from cipher.
IvParameterSpec spec = null;
try {
spec = encCipher.getParameters().getParameterSpec(IvParameterSpec.class);
} catch (InvalidParameterSpecException ex) {
Logger.getLogger(PeersController.class.getName()).log(Level.SEVERE, null, ex);
}
byte[] iv = spec.getIV();
dos.write(iv, 0, iv.length);
File tempDir = new File(tempDirectory.toString());
//Encryption Mechanism.
try (FileInputStream fis = new FileInputStream(file)) {
try (CipherOutputStream cos = new CipherOutputStream(dos, encCipher);
FileInputStream stream = new FileInputStream(tempDir + "\\" + fileName + ".encr")) {
int read, r;
byte[] buffer = new byte[1024 * 1024];
while ((read = fis.read(buffer)) != -1) {
cos.write(buffer, 0, read);
}
}
}
}
客户：
long len;
int count = 0;
int dflag = 0;
String size;
dos.writeBytes("Download\r\n"); //1+
dos.writeBytes(filename + "\r\n"); //2+
System.out.println("File to fetch: -> " + filename);
len = dis.readLong(); //3
System.out.println("Size of file: -> " + len);
//Get file name without Extension.
String fileName = Files.getNameWithoutExtension(filename);
//Get Initialization Vector from Encryption Cypher.
byte[] iv = new byte[16];
int j = dis.read(iv, 0, iv.length);
final File encrypted = new File(sharedDirectory.toString() + "\\" + fileName + ".encr");
final File decrypted = new File(sharedDirectory.toString() + "\\" + filename);
try (FileOutputStream fos = new FileOutputStream(encrypted)) {
byte[] b = new byte[1024 * 1024];
while (fetching) {
int r = dis.read(b, 0, b.length); //4
count = count + r;
double p = (double) count / len;
double per = new BigDecimal(p).setScale(4, BigDecimal.ROUND_HALF_UP).doubleValue();
fos.write(b, 0, r);
System.out.println("Size Appending: -> " + count);
System.out.println("Percentage: ->" + per);
Platform.runLater(() -> {
pBar.setProgress(per);
});
if (count >= len) {
dflag = 1;
break;
}
}
}
如果完全接收到加密数据
if(dflag == 1) {
//AES-128 bit key initialization.
System.out.println("File completely received");
byte[] keyvalue = "AES128PeerBuLLet".getBytes();
Key key = new SecretKeySpec(keyvalue, "AES");
//Initialization Vector initialized
IvParameterSpec ivParameterSpec = null;
//Cipher Initialization.
Cipher decCipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
try {
decCipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(iv));
} catch (InvalidAlgorithmParameterException ex) {
Logger.getLogger(PeersController.class.getName()).log(Level.SEVERE, null, ex);
}
System.out.println(decCipher.getProvider().getInfo());
//Decryption Mechanism.
try (FileOutputStream stream = new FileOutputStream(decrypted)) {
try (FileInputStream fis = new FileInputStream(encrypted)) {
try (CipherInputStream cis = new CipherInputStream(fis, decCipher)) {
int read, i = 0;
byte[] buffer = new byte[(1024 * 1024) + 16];
while ((read = cis.read(buffer)) != -1) {
stream.write(buffer, 0, read);
i = i + read;
double d = (double) i / len;
double progress = new BigDecimal(d).setScale(3, BigDecimal.ROUND_HALF_UP).doubleValue();
Platform.runLater(() -> {
pBar.setProgress(progress);
progressText.setText("Decrypting..");
});
}
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
任何输入都受到高度赞赏。谢谢你。
编辑 1：添加了通过流接收的加密和解密文件大小的链接。Dropbox Link
Edit 2：所以最后在三位参与帮助我的成员的帮助下，问题得到了解决。我正在审查我的问题的其他解决方案，我遇到了这个解决方案，它帮助我深入思考后台发生的实际情况。感谢Artjom B.的推荐解决方案以及@zaph 和 @jtahlborn清除了我关于填充和输入/输出流的错误假设。
