AES 알고리즘으로 해독 할 때 BadPaddingException이 발생합니다.

Question

AES 알고리즘으로 해독 할 때 다음 오류가 발생합니다. 나는 내가 어디로 잘못 가고 있는지 이해하지 못한다. 이 코드가 나에게 잘 작동하는 데는 며칠이 걸리지 만 그러한 오류가 발생하는 것은 아닙니다. 내가 얻고

오류 : -

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 userInterface.Decryption.decryption(Decryption.java:61) 
at userInterface.DecodingTab$DecodeButtonActionListener.actionPerformed(DecodingTab.java:295) 
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source) 
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source) 
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source) 
at javax.swing.DefaultButtonModel.setPressed(Unknown Source) 
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source) 
at java.awt.Component.processMouseEvent(Unknown Source) 
at javax.swing.JComponent.processMouseEvent(Unknown Source) 
at java.awt.Component.processEvent(Unknown Source) 
at java.awt.Container.processEvent(Unknown Source) 
at java.awt.Component.dispatchEventImpl(Unknown Source) 
at java.awt.Container.dispatchEventImpl(Unknown Source) 
at java.awt.Component.dispatchEvent(Unknown Source) 
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source) 
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source) 
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source) 
at java.awt.Container.dispatchEventImpl(Unknown Source) 
at java.awt.Window.dispatchEventImpl(Unknown Source) 
at java.awt.Component.dispatchEvent(Unknown Source) 
at java.awt.EventQueue.dispatchEventImpl(Unknown Source) 
at java.awt.EventQueue.access$500(Unknown Source) 
at java.awt.EventQueue$3.run(Unknown Source) 
at java.awt.EventQueue$3.run(Unknown Source) 
at java.security.AccessController.doPrivileged(Native Method) 
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) 
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) 
at java.awt.EventQueue$4.run(Unknown Source) 
at java.awt.EventQueue$4.run(Unknown Source) 
at java.security.AccessController.doPrivileged(Native Method) 
at ... 40 more 

암호화 코드 : -

public Encryption(String key2, FileInputStream fileInputStream, 
     FileOutputStream fileOutputStream) { 
    this.key = key2; 
    this.is = fileInputStream; 
    this.os = fileOutputStream; 
} 

public boolean encryption() throws Throwable { 
    MessageDigest md5 = MessageDigest.getInstance("MD5"); 
     md5.update(key.getBytes()); 

     SecretKeySpec key = new SecretKeySpec(md5.digest(), "AES"); 

     cipher = Cipher.getInstance("AES"); 
     cipher.init(Cipher.ENCRYPT_MODE, key); 
     cipherInputStream = new CipherInputStream(is, cipher); 

    byte[] bytes = new byte[64]; 
    int numBytes; 
    while ((numBytes = cipherInputStream.read(bytes)) != -1) { 
     os.write(bytes, 0, numBytes); 
    } 
    os.flush(); 
    os.close(); 
    is.close(); 
    cipherInputStream.close(); 
    return true; 
} 

** 암호 해독 코드 : - **

public Decryption(String decodingKey, File fileOutput) { 
    this.key = decodingKey; 
    this.outputFile = fileOutput.getAbsolutePath(); 
} 

public boolean decryption() throws IOException, Throwable { 
    encryptedFile = new File("Crypto\\EncryptedFile.txt"); 
    is = new FileInputStream(encryptedFile); 
    File outputF = new File(outputFile); 
    os = new FileOutputStream(outputF); 

    MessageDigest md5 = MessageDigest.getInstance("MD5"); 
     md5.update(key.getBytes()); 

     SecretKeySpec key = new SecretKeySpec(md5.digest(), "AES"); 

     cipher = Cipher.getInstance("AES"); 
     //cipher = Cipher.getInstance("AES/CBC/NoPadding"); 
     cipher.init(Cipher.DECRYPT_MODE, key); 
    cipherInputStream = new CipherInputStream(is, cipher); 

    byte[] bytes = new byte[64]; 
    int numBytes; 
    while ((numBytes = cipherInputStream.read(bytes)) != -1) { 
     os.write(bytes, 0, numBytes); 
    } 
    os.flush(); 
    os.close(); 
    cipherInputStream.close(); 
    is.close(); 
    encryptedFile.delete(); 
    return true; 
} 

주세요 나 내가 어디로 가고 있는지 안다. 잘못된.

Answer 1

암호화 부분에 CipherOutputStream을 사용해야하며 최종 패딩 데이터가 기록되도록 close을 호출해야합니다.