如有必要，我可以提供更多细节，但我的问题基本上是这样的：
如果我正在运行使用我创建（并拥有）的 RSA pub/priv 密钥组合加密流量的 openfire 服务器，有没有办法（最好在 Java 中）从线路上嗅出数据包，然后使用我的私钥解密它们? 目前我可以使用以下方法加密/解密字符串：
public class TLSDecryptTest {
Cipher Ecipher;
Cipher Dcipher;
public TLSDecryptTest(String pubpath, String privpath){
byte[] publicKeyContentsAsByteArray;
RSAPublicKey pubKey;
try {
this.Ecipher = Cipher.getInstance("RSA");
String path1 = new String("C:\\Users\\peter.marino\\Desktop\\javapub.key");
File pubFile = new File(path1);
publicKeyContentsAsByteArray = new byte[(int)pubFile.length()];
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(pubFile));
publicKeyContentsAsByteArray = new byte[(int)pubFile.length()];
bis.read(publicKeyContentsAsByteArray);
bis.close();
CertificateFactory certificateFactory = CertificateFactory.getInstance("X509");
Certificate certificate = certificateFactory.generateCertificate(new ByteArrayInputStream(publicKeyContentsAsByteArray));
pubKey = (RSAPublicKey) certificate.getPublicKey();
this.Ecipher.init(Cipher.ENCRYPT_MODE, pubKey);
} catch(Exception e) {
System.out.println("Exception" + e);
}
try {
this.Dcipher = Cipher.getInstance("RSA");
String path2 = new String("C:\\Users\\peter.marino\\Desktop\\java.key");
File privFile = new File(path2);
byte[] privateKeyContentsAsByteArray = new byte[(int)privFile.length()];
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(privFile));
privateKeyContentsAsByteArray = new byte[(int)privFile.length()];
bis.read(privateKeyContentsAsByteArray);
bis.close();
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
KeySpec ks = new PKCS8EncodedKeySpec(privateKeyContentsAsByteArray);
RSAPrivateKey privKey = (RSAPrivateKey) keyFactory.generatePrivate(ks);
System.out.println("PRIVATE KEY:::: " + new String(privKey.getEncoded()).equals(new String(privateKeyContentsAsByteArray)));
this.Dcipher.init(Cipher.DECRYPT_MODE, privKey);
} catch(Exception e) {
System.out.println("Exception" + e);
}
}
public byte[] en(byte[] decryptedMessage) throws Exception {
byte[] encryptedMessage = this.Ecipher.doFinal(decryptedMessage);
//byte[] encryptedMessage = this.Ecipher.doFinal(decryptedMessage);
return (encryptedMessage);
}
public byte[] de(byte[] encryptedMessage) throws Exception {
byte[] decryptedMessage = this.Dcipher.doFinal(encryptedMessage);
return (decryptedMessage);
}
public static void main(String args[]) throws Exception{
TLSDecryptTest t = new TLSDecryptTest(null,null);
String s = ("Testing decryption.1Testing decryption.2Testing decryption.3Testing decryption.4");
System.out.println("S: " + s);
byte[] todo = s.getBytes();
byte[] e = t.en(todo);
String es = new String(e);
System.out.println("E: " + es);
byte[] d = t.de(e);
String ds = new String(d);
System.out.println("D: " + ds);
}
}
效果很好。但是，如果我从网络上嗅出几个数据包然后尝试解密它，我会得到错误。我什至尝试只解密它的前 256 个字节，因为这是我的 RSA 密钥的限制，但它仍然会引发错误。最值得注意的是，在 doFinal() 行出现了 BadPaddingException。
有任何想法吗？
提前致谢。
