我想製作一個程序,使用AES加密數據,然後使用RSA加密AES密鑰,然後解密。但是,一旦我對AES密鑰進行加密,就會出現128字節。 RSA只允許我解密117個字節或更少,所以當我去解密AES密鑰時,它會引發錯誤。加密的AES密鑰太大,無法用RSA解密(Java)
Relavent代碼:
KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
kpg.initialize(1024);
KeyPair kpa = kpg.genKeyPair();
pubKey = kpa.getPublic();
privKey = kpa.getPrivate();
updateText("Private Key: " +privKey +"\n\nPublic Key: " +pubKey);
updateText("Encrypting " +infile);
//Genereate aes key
KeyGenerator kgen = KeyGenerator.getInstance("AES");
kgen.init(128); // 192/256
SecretKey aeskey = kgen.generateKey();
byte[] raw = aeskey.getEncoded();
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
updateText("Encrypting data with AES");
//encrypt data with AES key
Cipher aesCipher = Cipher.getInstance("AES");
aesCipher.init(Cipher.ENCRYPT_MODE, skeySpec);
SealedObject aesEncryptedData = new SealedObject(infile, aesCipher);
updateText("Encrypting AES key with RSA");
//encrypt AES key with RSA
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, pubKey);
byte[] encryptedAesKey = cipher.doFinal(raw);
updateText("Decrypting AES key with RSA. Encrypted AES key length: " +encryptedAesKey.length);
//decrypt AES key with RSA
Cipher decipher = Cipher.getInstance("RSA");
decipher.init(Cipher.DECRYPT_MODE, privKey);
byte[] decryptedRaw = decipher.doFinal(encryptedAesKey); //error thrown here because encryptedAesKey is 128 bytes
SecretKeySpec decryptedSecKey = new SecretKeySpec(decryptedRaw, "AES");
updateText("Decrypting data with AES");
//decrypt data with AES key
Cipher decipherAES = Cipher.getInstance("AES");
decipherAES.init(Cipher.DECRYPT_MODE, decryptedSecKey);
String decryptedText = (String) aesEncryptedData.getObject(decipherAES);
updateText("Decrypted Text: " +decryptedText);
如何解決這個問題的任何想法?
您對錯誤的描述沒有意義。您應該發佈完整的堆棧跟蹤。就目前而言,代碼中的RSA部分應該可以正常工作。我測試了它,它對我來說工作得很好。 – 2010-05-03 23:55:10
啊,現在我明白了,你是一個懶惰的混蛋。我看到你在一個月前在太陽論壇*上發佈了相同的代碼,並且*你被告知你的bug是什麼。然後,您只需轉發相同的代碼就可以浪費所有人的時間。如果我跑這個網站,我會刪除您的帳戶。 – 2010-05-04 01:19:25