我正在尝试编写一个程序,使用AES加密数据,然后使用RSA加密AES密钥,最后再进行解密。但是,一旦我加密了AES密钥,它就变成了128个字节。RSA只允许我解密117个字节或更少,所以当我尝试解密AES密钥时,会出现错误。
相关代码:
有什么办法可以解决这个问题吗?
相关代码:
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);
有什么办法可以解决这个问题吗?