将Key转换为String并返回Key Java

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所以我正在尝试将Key转换为字符串，以便我可以使用System.out显示它，然后我想将其转换回Key。我能够将它转换为带有BASE64Encoder的字符串，但是我在转换它时遇到了问题。这是我的源代码：

so I'm trying to convert a Key into a string so I can display it with System.out, and then I want to convert it back to a Key. I am able to convert it to a string with BASE64Encoder, but I'm having problems converting it back. Here is my source code:

public class Encryption extends Applet { Key keyOrig; BASE64Decoder decoder = new BASE64Decoder(); BASE64Encoder encoder = new BASE64Encoder(); public void init() { try { keyOrig = generateKey(); String keyString = encoder.encode(keyOrig.getEncoded()); System.out.println("Key: "+keyString); Key key = new SecretKeySpec(keyString.getBytes(),0,keyString.getBytes().length, "DES"); String message = "This is hacker proof!"; System.out.println("Message is: "+message); String encryptedMessage = encrypt(message,key); System.out.println("Message encrypted: "+ encryptedMessage); String decryptedMessage = decrypt(encryptedMessage,key); System.out.println("Message decrypted: "+ decryptedMessage); } catch (Exception e) { e.printStackTrace(); } } public Key generateKey() throws NoSuchAlgorithmException { KeyGenerator generator; generator = KeyGenerator.getInstance("DES"); generator.init(new SecureRandom()); return keyOrig = generator.generateKey(); } @SuppressWarnings("unused") public String encrypt(String message, Key key) throws IllegalBlockSizeException, BadPaddingException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, UnsupportedEncodingException { // Get a cipher object. Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding"); cipher.init(Cipher.ENCRYPT_MODE, key); // Gets the raw bytes to encrypt, UTF8 is needed for // having a standard character set byte[] stringBytes = message.getBytes("UTF8"); // encrypt using the cypher byte[] raw = cipher.doFinal(stringBytes); // converts to base64 for easier display. @SuppressWarnings("restriction") BASE64Encoder encoder = new BASE64Encoder(); String base64 = encoder.encode(raw); return base64; } public String decrypt(String encrypted, Key key) throws InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, IOException { // Get a cipher object. Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding"); cipher.init(Cipher.DECRYPT_MODE, key); // decode the BASE64 coded message BASE64Decoder decoder = new BASE64Decoder(); byte[] raw = decoder.decodeBuffer(encrypted); // decode the message byte[] stringBytes = cipher.doFinal(raw); // converts the decoded message to a String String clear = new String(stringBytes, "UTF8"); return clear; } }

推荐答案

你永远不要使用你的 BASE64Decoder 取消你的字符串64。

You never use your BASE64Decoder to un-base-64 your string.

替换它：

Key key = new SecretKeySpec(keyString.getBytes(),0,keyString.getBytes().length, "DES");

with

byte[] encodedKey = decoder.decodeBuffer(keyString); Key key = new SecretKeySpec(encodedKey,0,encodedKey.length, "DES");