Java:未捕获故意的BadPaddingException
我的应用程序提示用户输入用于加密控制文件的密码。如果输入了错误的密码,应用程序将通过创建新的控制文件进行响应。因此,我需要捕获BadPaddingException,以便触发适当的响应 下面是应该生成异常的代码段Java:未捕获故意的BadPaddingException,java,try-catch,badpaddingexception,Java,Try Catch,Badpaddingexception,我的应用程序提示用户输入用于加密控制文件的密码。如果输入了错误的密码,应用程序将通过创建新的控制文件进行响应。因此,我需要捕获BadPaddingException,以便触发适当的响应 下面是应该生成异常的代码段 private void existingHashFile(String file) { psUI = new passwordUI(new javax.swing.JFrame(), true, "existing"); psUI.setVisible
private void existingHashFile(String file) {
psUI = new passwordUI(new javax.swing.JFrame(), true, "existing");
psUI.setVisible(true);
this.key = passwordUI.key;
try {
hash.decryptHashFile(file, this.key); //this is line 240
} catch (BadPaddingException ex) {
Logger.getLogger(homePage.class.getName()).log(Level.SEVERE, null, ex);
//then the file was not decrypted
System.out.println("BPE 2!");
} catch (Exception ex) {
Logger.getLogger(homePage.class.getName()).log(Level.SEVERE, null, ex);
System.out.println("BPE 3!");
}
为了完整起见,下面是上面调用的decryptHashFile方法
public void decryptHashFile(String filename, String key) throws BadPaddingException, UnsupportedEncodingException, Exception {
FileInputStream fis = null;
FileOutputStream fos = null;
CipherInputStream cis = null;
String outFile = filename.replace(".enc", "");
byte[] byteKey = key.getBytes("UTF-8");
Cipher cipher = getCipher(byteKey, "decrypt");
try {
fis = new FileInputStream(filename);
fos = new FileOutputStream(outFile);
cis = new CipherInputStream(fis, cipher);
byte[] buffer = new byte[1024];
int read = cis.read(buffer);
while (read != -1) {
fos.write(buffer, 0, read);
read = cis.read(buffer); //this is line 197
}
} catch (IOException ex) {
Logger.getLogger(hashListClass.class.getName()).log(Level.SEVERE, null, ex);
} finally {
if (fos != null) {
fos.close();
}
if (cis != null) {
cis.close();
}
if (fis != null) {
fis.close();
}
}
}
当我故意输入错误的密码时,我看到了这个堆栈跟踪,但是我在示例中使用的println代码没有执行:
Dec 02, 2017 2:31:34 PM appwatch.hashListClass decryptHashFile
SEVERE: null
java.io.IOException: javax.crypto.BadPaddingException: Given final block not properly padded
at javax.crypto.CipherInputStream.getMoreData(CipherInputStream.java:121)
at javax.crypto.CipherInputStream.read(CipherInputStream.java:239)
at javax.crypto.CipherInputStream.read(CipherInputStream.java:215)
at appwatch.hashListClass.decryptHashFile(hashListClass.java:197)
at appwatch.homePage.existingHashFile(homePage.java:240)
您的第197行抛出IOException,而不是BadPaddingException,因此该异常被后续的catch IOException ex捕获
在此之后,您不会显式地抛出其他异常,因此在解密hashfile之后没有其他要捕获的异常。谢谢,现在您已经解释了这一点,看起来很明显。由于我在decryptHashFile方法中处理异常,如果密码错误,我的调用方法就没有机会运行代码。所以我需要将IOException抛出,而不是捕获它,我猜?您可以重新抛出它,或者只是不在decryptHashFile中捕获它,或者返回布尔成功,而不是在existingHashFile中捕获异常。。。这是你的选择