AES码投掷NoSuchPaddingException：填充NoPaddin未知

Question

下面的代码是一个尝试对数据进行加密使用AES与非对称密钥：

import java.io.OutputStream; 
import java.math.BigInteger; 
import java.security.Key; 
import java.security.KeyFactory; 
import java.security.interfaces.RSAPrivateKey; 
import java.security.interfaces.RSAPublicKey; 
import java.security.spec.RSAPrivateKeySpec; 
import java.security.spec.RSAPublicKeySpec; 

import javax.crypto.Cipher; 

public class AsyncronousKeyTest { 

    private final Cipher cipher; 
    private final KeyFactory keyFactory; 
    private final RSAPrivateKey privKey; 

    private AsyncronousKeyTest() throws Exception { 
cipher = Cipher.getInstance("AES/CBC/NoPaddin", "BC"); 
keyFactory = KeyFactory.getInstance("AES", "BC"); 

// create the keys 

RSAPrivateKeySpec privKeySpec = new RSAPrivateKeySpec(new BigInteger(
    "d46f473a2d746537de2056ae3092c451", 16), new BigInteger("57791d5430d593164082036ad8b29fb1", 
    16)); 
privKey = (RSAPrivateKey) keyFactory.generatePrivate(privKeySpec); 

    } 

    public void generateAuthorizationAct(OutputStream outputStream) throws Exception { 

KeyFactory keyFactory = KeyFactory.getInstance("AES", "BC"); 
RSAPublicKeySpec pubKeySpec = new RSAPublicKeySpec(new BigInteger("d46f473a2d746537de2056ae3092c451", 
    16), new BigInteger("11", 16)); 
RSAPublicKey pubKey = (RSAPublicKey) keyFactory.generatePublic(pubKeySpec); 

byte[] data = new byte[] {0x01}; 

byte[] encrypted = encryptAO(pubKey, data); 
outputStream.write(encrypted); 
    } 

    /** Encrypt the AuthorizationObject. */ 
    public byte[] encryptAO(Key pubKey, byte[] data) throws Exception { 
cipher.init(Cipher.ENCRYPT_MODE, pubKey); 
byte[] cipherText = cipher.doFinal(data); 
return cipherText; 
    } 

    public byte[] decrypt(byte[] cipherText) throws Exception { 
cipher.init(Cipher.DECRYPT_MODE, privKey); 
byte[] decyptedData = cipher.doFinal(cipherText); 
return decyptedData; 

    } 

    public static void main(String[] args) throws Exception { 
System.out.println("start"); 

AsyncronousKeyTest auth = new AsyncronousKeyTest(); 
auth.generateAuthorizationAct(System.out); 

System.out.println("done"); 
    } 

} 

，但在行

cipher = Cipher.getInstance("AES/CBC/NoPaddin", "BC"); 

它抛出

NoSuchPaddingException: Padding NoPaddin unknown. 

这是什么？以及如何解决？

Answer 1

“Padding”不是“Paddin”。 “g”很重要。

此外，“用非对称密钥AES加密数据”是没有意义的。正如其名称所述，RSA密钥用于RSA，而不用于AES。 AES使用对称密钥，即长度为16,24或32字节的（任意）字节数组。 RSA密钥是由两个整数组成的数学对象，其中一个非常大（通常为1024位）。