temp acct
Reputation: 43
Having issues with decrypting AES-GCM
I've been trying to figure out my way around the java security/crypto libraries and i believe I've made some progress with understanding what's going on. I think I managed to get the encryption part working. In my encrypt method if i simply try to return
return new String(encryptedText, "UTF-8");
I get some unreadable jumble which looks like encrypted text.
The issue comes about when I try to instead of returning that, going on and calling decrypt and going cleartext --> encrypt --> decrypt
here is everything i have
import javax.crypto.*;
import java.security.*;
import java.io.UnsupportedEncodingException;
public class AES256_GCM {
public String encrypt(String cleartext) {
try
{
// encoding format needs thought
byte[] clearTextbytes = cleartext.getBytes("UTF-8");
final SecureRandom secureKeyRandomness = SecureRandom.getInstanceStrong();
final KeyGenerator AES_keyInstance = KeyGenerator.getInstance("AES");
AES_keyInstance.init(128, secureKeyRandomness);
final SecretKey secretKey = AES_keyInstance.generateKey();
final Cipher AES_cipherInstance = Cipher.getInstance("AES/GCM/NoPadding");
AES_cipherInstance.init(Cipher.ENCRYPT_MODE, secretKey);
byte[] encryptedText = AES_cipherInstance.doFinal(clearTextbytes);
return decrypt(encryptedText, secretKey);
}
catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException | IllegalBlockSizeException | BadPaddingException | UnsupportedEncodingException e)
{
e.printStackTrace();
}
return "something went wrong with encrypt";
} // encrypt.
public String decrypt(byte[] encryptedText, SecretKey secretKey) {
try
{
final Cipher AES_cipherInstance = Cipher.getInstance("AES/GCM/NoPadding");
AES_cipherInstance.init(Cipher.DECRYPT_MODE, secretKey);
byte[] decryptedText = AES_cipherInstance.doFinal(encryptedText);
return new String(decryptedText, "UTF-8");
}
catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException | IllegalBlockSizeException | BadPaddingException | UnsupportedEncodingException e)
{
e.printStackTrace();
}
return "something went wrong with decrypt";
} // decrypt.
} // AES256_GCM.
So i call encrypt with some cleartext and try to return back the cleartext to make sure it works. Here's what im dealing with, Anything with javafx in there is probably irrelevant. I get no issues returning the encrypted string, its only the decrypted string throwing this.
"something went wrong with decrypt" is returned followed by:
java.security.InvalidKeyException: Parameters missing
at com.sun.crypto.provider.CipherCore.init(CipherCore.java:470)
at com.sun.crypto.provider.AESCipher.engineInit(AESCipher.java:313)
at javax.crypto.Cipher.implInit(Cipher.java:801)
at javax.crypto.Cipher.chooseProvider(Cipher.java:863)
at javax.crypto.Cipher.init(Cipher.java:1248)
at javax.crypto.Cipher.init(Cipher.java:1185)
at PackageName.AES256_GCM.decrypt(AES256_GCM.java:49)
at PackageName.AES256_GCM.encrypt(AES256_GCM.java:36)
at com.javafxpractice.PackageName.letsEncrypt.letsEnc(letsEncrypt.java:10)
at com.javafxpractice.PackageName.Controller.onClicked(Controller.java:24)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.reflect.misc.Trampoline.invoke(Unknown Source)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.reflect.misc.MethodUtil.invoke(Unknown Source)
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769)
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Node.fireEvent(Node.java:8413)
at javafx.scene.control.Button.fire(Button.java:185)
at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89)
at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3757)
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:394)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$353(GlassViewEventHandler.java:432)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:431)
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
at com.sun.glass.ui.View.notifyMouse(View.java:937)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177)
at java.lang.Thread.run(Unknown Source)
java.security.InvalidKeyException: Parameters missing
at com.sun.crypto.provider.CipherCore.init(CipherCore.java:470)
at com.sun.crypto.provider.AESCipher.engineInit(AESCipher.java:313)
at javax.crypto.Cipher.implInit(Cipher.java:801)
at javax.crypto.Cipher.chooseProvider(Cipher.java:863)
at javax.crypto.Cipher.init(Cipher.java:1248)
at javax.crypto.Cipher.init(Cipher.java:1185)
at PackageName.AES256_GCM.decrypt(AES256_GCM.java:49)
at PackageName.AES256_GCM.encrypt(AES256_GCM.java:36)
at com.javafxpractice.PackageName.letsEncrypt.letsEnc(letsEncrypt.java:10)
at com.javafxpractice.PackageName.Controller.onEnter(Controller.java:32)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.reflect.misc.Trampoline.invoke(Unknown Source)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.reflect.misc.MethodUtil.invoke(Unknown Source)
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769)
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Scene$KeyHandler.process(Scene.java:3964)
at javafx.scene.Scene$KeyHandler.access$1800(Scene.java:3910)
at javafx.scene.Scene.impl_processKeyEvent(Scene.java:2040)
at javafx.scene.Scene$ScenePeerListener.keyEvent(Scene.java:2501)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$KeyEventNotification.run(GlassViewEventHandler.java:217)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$KeyEventNotification.run(GlassViewEventHandler.java:149)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleKeyEvent$352(GlassViewEventHandler.java:248)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleKeyEvent(GlassViewEventHandler.java:247)
at com.sun.glass.ui.View.handleKeyEvent(View.java:546)
at com.sun.glass.ui.View.notifyKey(View.java:966)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177)
at java.lang.Thread.run(Unknown Source)
Upvotes: 4
Views: 17131
Answers (1)
piy26
Reputation: 1592
Added GCMParameterSpec inplace of IVParameterSpec. A nice discussion as a precursor up for the code edit below is Java AES/GCM/NoPadding - What is cipher.getIV() giving me?
import javax.crypto.*;
import javax.crypto.spec.GCMParameterSpec;
import java.security.*;
import java.io.UnsupportedEncodingException;
public class EncryptDecrypt1 {
public static void main(String[] args) throws Exception {
EncryptDecrypt1 a = new EncryptDecrypt1();
String encrypted = a.encrypt("My text");
System.out.println(encrypted);
}
public String encrypt(String cleartext) throws Exception {
try
{
// encoding format needs thought
byte[] clearTextbytes = cleartext.getBytes("UTF-8");
final SecureRandom secureKeyRandomness = SecureRandom.getInstanceStrong();
final KeyGenerator AES_keyInstance = KeyGenerator.getInstance("AES");
AES_keyInstance.init(128, secureKeyRandomness);
final SecretKey secretKey = AES_keyInstance.generateKey();
final Cipher AES_cipherInstance = Cipher.getInstance("AES/GCM/NoPadding");
AES_cipherInstance.init(Cipher.ENCRYPT_MODE, secretKey);
byte[] encryptedText = AES_cipherInstance.doFinal(clearTextbytes);
byte[] iv = AES_cipherInstance.getIV();
byte[] message = new byte[12 + clearTextbytes.length + 16];
System.arraycopy(iv, 0, message, 0, 12);
System.arraycopy(encryptedText, 0, message, 12, encryptedText.length);
return decrypt(message, secretKey);
}
catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException | IllegalBlockSizeException | BadPaddingException | UnsupportedEncodingException e)
{
e.printStackTrace();
}
return "something went wrong with encrypt";
} // encrypt.
public String decrypt(byte[] encryptedText, SecretKey secretKey) throws Exception {
try
{
final Cipher AES_cipherInstance = Cipher.getInstance("AES/GCM/NoPadding");
GCMParameterSpec params = new GCMParameterSpec(128, encryptedText, 0, 12);
AES_cipherInstance.init(Cipher.DECRYPT_MODE, secretKey, params);
byte[] decryptedText = AES_cipherInstance.doFinal(encryptedText, 12, encryptedText.length - 12);
return new String(decryptedText, "UTF-8");
}
catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException | IllegalBlockSizeException | BadPaddingException | UnsupportedEncodingException e)
{
e.printStackTrace();
}
return "something went wrong with decrypt";
}
}
Upvotes: 7
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