鉴于我知道 aes-128-cbc 用于生成密文，没有使用加盐并且 IV 都是零，我的目标是编写一个程序来找出用于加密纯文本的密钥（我还得到了一个可能使用的键的字典）。
所以我实现了以下
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.security.InvalidKeyException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.Provider;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
public class myClassName123 {
/**
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
try {
BufferedReader in = new BufferedReader(new FileReader("/Users/username/Documents/f12/words.txt"));
String str;
while ((str = in.readLine()) != null && str.getBytes().length<16) { //clue given in spec
System.out.println(decrypt(getBytesFromFile(new File("/Users/username/Documents/f21/some.aes-128-cbc")),str));
}
in.close();
} catch (IOException e) {
}
}
/**
* This method decrypts the input byte [] using AES Key byte []
*
* @param byte []
* @param byte []
* @return byte []
* @throws Exception
*/
public static byte[] decrypt(byte[] text, String key) throws Exception {
Cipher cipher;
byte[] bytes = null;
Provider provider = new BouncyCastleProvider();
MessageDigest digester = MessageDigest.getInstance("SHA-256", provider);
digester.update(key.getBytes("UTF-8"));
//byte[] key = digester.digest();
SecretKeySpec spec = new SecretKeySpec(digester.digest(), "AES");
//SecretKeySpec spec = new SecretKeySpec(toByteArray(key.toCharArray()), "AES");
byte[] iv = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
IvParameterSpec ivspec = new IvParameterSpec(iv);
try {
// Instantiate the cipher
cipher = Cipher.getInstance("AES/CBC/NoPadding");
cipher.init(Cipher.DECRYPT_MODE, spec, ivspec);
bytes = cipher.doFinal(text);
String value = new String(bytes, "UTF-8");
System.out.println("DEBUG HERE: "+value);
}catch (NoSuchAlgorithmException e) {
e.printStackTrace();
// throw new Exception(e);
} catch (NoSuchPaddingException e) {
e.printStackTrace();
// throw new Exception(e);
} catch (InvalidKeyException e) {
e.printStackTrace();
//throw new Exception(e);
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
//throw new Exception(e);
} catch (BadPaddingException e) {
e.printStackTrace();
//throw new Exception(e);
}
return bytes;
}
// Returns the contents of the file in a byte array.
public static byte[] getBytesFromFile(File file) throws IOException {
InputStream is = new FileInputStream(file);
// Get the size of the file
long length = file.length();
// Create the byte array to hold the data
byte[] bytes = new byte[(int)length];
// Read in the bytes
int offset = 0;
int numRead = 0;
while (offset < bytes.length
&& (numRead=is.read(bytes, offset, bytes.length-offset)) >= 0) {
offset += numRead;
}
// Ensure all the bytes have been read in
if (offset < bytes.length) {
throw new IOException("Could not completely read file "+file.getName());
}
// Close the input stream and return bytes
is.close();
return bytes;
}
}
但是，当我运行它时，我得到以下信息：
在这里调试：（M��1�����-��e�}�p����+�� [B@4ed1e89e
我想我没有正确转换为字符串，但我目前坚持这一点。非常感谢任何帮助，非常感谢。