j2me中文手機不支持AESEncoder類

Question

我在J2ME應用程序中使用此加密類。我的J2ME應用程序可在所有諾基亞設備上正常工作該應用程序不適用於中國的MIw200手機。這款手機可能不支持這種加密技術？是否有另一種解決方案或任何其他方法來加密和解密？

請幫幫我。提前致謝。

我的代碼如下：

import java.security.NoSuchAlgorithmException; 
import javax.crypto.Cipher; 
import javax.crypto.NoSuchPaddingException; 
import javax.crypto.spec.SecretKeySpec; 


public class AESEncoder { 

    private SecretKeySpec keyspec; 
    private Cipher cipher; 
    private String secretkey; 

    public AESEncoder(String secretkey) { 
     this.secretkey = secretkey; 
     keyspec = new SecretKeySpec(secretkey.getBytes(), 0, 16, "AES"); 

//  keyspec=new SecretKeySpec(key, offset, len, secretkey); 

     try { 
      cipher = Cipher.getInstance("AES/ECB/NoPadding"); 
     } catch (NoSuchAlgorithmException e) { 
      e.printStackTrace(); 
     } catch (NoSuchPaddingException e) { 
      e.printStackTrace(); 
     } 
    } 
    public byte[] encrypt(String text) throws Exception { 
     if (text == null || text.length() == 0) { 
      throw new Exception("Empty string"); 
     } 

     int encrypted = 0; 

     byte[] bytenc = null;//new byte[32]; 
     byte[] input = null; 

     try { 
      cipher.init(Cipher.ENCRYPT_MODE, keyspec); 
//   byte empty[]=padString(text).getBytes(); 
//   encrypted = cipher.doFinal(padString(text).getBytes()); 
//   encrypted=cipher.doFinal(padString(text).getBytes(), 0, 0, padString(text).getBytes(), 0); 

      input = padString(text).getBytes(); 
      bytenc = new byte[input.length]; 
      encrypted = cipher.doFinal(input, 0, input.length, bytenc, 0); 

      String str = new String(bytenc, 0, encrypted); 
//   encrypted=cipher.update(padString(text).getBytes(), 0, 0, 0, 0); 
//   System.out.println("Encrypted is:>>" + str); 
//   bytenc=hexToBytes(String.valueOf(encrypted)); 
     } catch (Exception e) { 
      throw new Exception("[encrypt] " + e.getMessage()); 
     } 
     return bytenc; 
    } 


    public String encrypt_hsm(String text) throws Exception { 
     if (text == null || text.length() == 0) { 
      throw new Exception("Empty string"); 
     } 
     String base64=null; 
     int encrypted = 0; 

     byte[] bytenc = null;//new byte[32]; 
     byte[] input = null; 

     try { 
      cipher.init(Cipher.ENCRYPT_MODE, keyspec); 
//   byte empty[]=padString(text).getBytes(); 
//   encrypted = cipher.doFinal(padString(text).getBytes()); 
//   encrypted=cipher.doFinal(padString(text).getBytes(), 0, 0, padString(text).getBytes(), 0); 

      input = padString(text).getBytes(); 
      bytenc = new byte[input.length]; 
      encrypted = cipher.doFinal(input, 0, input.length, bytenc, 0); 

      String str = new String(bytenc, 0, encrypted); 

      base64 = Base64.encode(bytenc); 

//   encrypted=cipher.update(padString(text).getBytes(), 0, 0, 0, 0); 
//   System.out.println("Encrypted is:>>" + str); 
//   bytenc=hexToBytes(String.valueOf(encrypted)); 


     } catch (Exception e) { 
      throw new Exception("[encrypt] " + e.getMessage()); 
     } 
     return base64; 
    } 

    public byte[] decrypt(String code) throws Exception { 
     if (code == null || code.length() == 0) { 
      throw new Exception("Empty string"); 
     } 
     int decrypted = 0; 

     byte[] bytedec = null; 
     byte[] input = null; 

     try { 
      cipher.init(Cipher.DECRYPT_MODE, keyspec); 

//   input=hexToBytes(code); 
      input = Base64ToBytes(code); 
      bytedec = new byte[input.length]; 
      decrypted = cipher.doFinal(input, 0, input.length, bytedec, 0); 

      String str = new String(bytedec, 0, decrypted); 
//   System.out.println("Decrypted is:>>" + str); 

     } catch (Exception e) { 
      throw new Exception("[decrypt] " + e.getMessage()); 
     } 
     return bytedec; 
    } 

    public static String bytesToHex(byte[] bsData) { 
     int nDataLen = bsData.length; 
     String sHex = ""; 
     for (int nIter = 0; nIter < nDataLen; nIter++) { 
      int nValue = (bsData[nIter] + 256) % 256; 
      int nIndex1 = nValue >> 4; 
      sHex += Integer.toHexString(nIndex1); 
      int nIndex2 = nValue & 0x0f; 
      sHex += Integer.toHexString(nIndex2); 
     } 
     return sHex; 
    } 

    public static byte[] hexToBytes(String str) { 
     if (str == null) { 
      return null; 
     } else if (str.length() < 2) { 
      return null; 
     } else { 
      int len = str.length()/2; 
      byte[] buffer = new byte[len]; 
      for (int i = 0; i < len; i++) { 
       buffer[i] = (byte) Integer.parseInt(str.substring(i * 2, i * 2 + 2), 16); 
      } 
      return buffer; 
     } 
    } 

    private static String padString(String source) { 
     char paddingChar = ' '; 
     int size = 32; 
     int x = source.length() % size; 
     int padLength = size - x; 

     for (int i = 0; i < padLength; i++) { 
      source += paddingChar; 
     } 

//  System.out.println("====>Pad String:" + source); 
     return source; 
    } 

    public void startApp() { 
    } 

    public void pauseApp() { 
    } 

    public void destroyApp(boolean unconditional) { 
    } 

    private byte[] Base64ToBytes(String code) { 
     code = code.replace('-', '+'); 
     code = code.replace('_', '/'); 
     code = code.replace(',', '='); 
     System.out.println("Final Base 64:"+code); 

     byte[] aesString = Base64.decode(code); 
//  System.out.println("Base64 after decoding:"+new String(aesString)); 
     return aesString; 
    } 
} 

Answer 1

請張貼堆棧跟蹤。否則，我們都只是猜測。

AES是required cipher，有時介於v4和v7之間。花一些時間，並確認這個密碼在MIw200上不可用。

Someone getting "AES not available"在Mac上有一些建議。

嘗試允許系統回退到3DES或DES，而不是強制AES。 Here's an example that tests encryption with each algorithm.

嘗試使用BouncyCastle API。 Here is a how-to guide。