我正在尝试从 Alice 和 Bob 生成共享 key 。我使用 key 生成器来获取鲍勃和爱丽丝的公钥和私钥。然后,我使用 AES 生成了一个 key 。我应该做的是加密 key 然后解密它,它应该与原始 key 相同。但是,我的代码给了我一个异常,提示“解密错误”。我不明白为什么。谁能帮我?谢谢你!
此外,decodeBytes 和generateSharedKey 应该是相等的,我也遇到了麻烦。
import java.security.*;
import java.util.UUID;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
public class rsa {
static SecretKey sharedKey = null;
public static void main(String[] args) throws NoSuchAlgorithmException,
NoSuchProviderException, InvalidKeyException, NoSuchPaddingException,
IllegalBlockSizeException, BadPaddingException {
//Generates Key Pair -> a private and public key for both Alice and
Bob
KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA");
keyGen.initialize(2048);
//Alice's key pair
KeyPair aliceKey = keyGen.genKeyPair();
PublicKey pubAlice = aliceKey.getPublic(); //alice's public key
PrivateKey privAlice = aliceKey.getPrivate();//alice's private key
//Bob's key pair
KeyPair bobKey = keyGen.genKeyPair();
PublicKey pubBob = bobKey.getPublic(); //bob's public key
PrivateKey privBob = bobKey.getPrivate();// bob's private key
//Generates a random key and encrypt with Bob's public Key
System.out.println(generateSharedKey());
byte[] keyEncrypted = encrypt(sharedKey, pubBob);
byte[] decodeBytes = decrypt(sharedKey, privBob);
System.out.println(decodeBytes);
}
public static SecretKey generateSharedKey() throws
NoSuchAlgorithmException{
KeyGenerator sharedKeyGen = KeyGenerator.getInstance("AES");
sharedKey = sharedKeyGen.generateKey();
return sharedKey;
}
public static byte[] encrypt(SecretKey sharedKey, PublicKey pubKey)
throws NoSuchAlgorithmException, NoSuchPaddingException,
InvalidKeyException, IllegalBlockSizeException, BadPaddingException{
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, pubKey);
//System.out.println(inputBytes);
return cipher.doFinal(generateSharedKey().getEncoded());
}
public static byte[] decrypt(SecretKey sharedKey, PrivateKey privKey)
throws NoSuchAlgorithmException, NoSuchPaddingException,
InvalidKeyException, IllegalBlockSizeException, BadPaddingException{
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.DECRYPT_MODE, privKey);
return cipher.doFinal(generateSharedKey().getEncoded());
}
}
最佳答案
请在发布之前仔细阅读您的代码...您正在生成一个新共享 key ,然后尝试在您的decrypt
方法中对其进行解密...
您应该传入 byte[]
来解密并返回 SecretKey
,而不是相反。
关于java - 解密异常,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/49808193/