错误数据进行加密

• Z时代
• 2024-01-10
• 分类：问答

试图encrpt和下面的代码解密数据：错误数据进行加密

public class MCrypt { 
    // private String iv = ""; 
    private IvParameterSpec ivspec; 
    private SecretKeySpec keyspec; 
    private Cipher cipher; 
    //private String SecretKey = ""; 
Context context; 
    public MCrypt(Context context) 
    { 
     this.context=context; 
     ivspec = new IvParameterSpec(context.getString(R.string.iv).getBytes()); 
     keyspec = new SecretKeySpec(context.getString(R.string.secretkey).getBytes(), "AES"); 
     try { 
      cipher = Cipher.getInstance("AES/CBC/NoPadding"); 
     } catch (NoSuchAlgorithmException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } catch (NoSuchPaddingException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 
    } 
    public MCrypt(Context context, String key) 
    { 
     this.context=context; 
     ivspec = new IvParameterSpec(context.getString(R.string.iv).getBytes()); 
     keyspec = new SecretKeySpec(key.getBytes(), "AES"); 
     try { 
      cipher = Cipher.getInstance("AES/CBC/NoPadding"); 
     } catch (NoSuchAlgorithmException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } catch (NoSuchPaddingException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 
    } 
    public String encrypt(String text) throws Exception 
    { 
     if(text == null || text.length() == 0) 
      throw new Exception("Empty string"); 
     byte[] encrypted = null; 
     try { 
      cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec); 
      encrypted = cipher.doFinal(padString(text).getBytes()); 
     } catch (Exception e) 
     { 
      throw new Exception("[encrypt] " + e.getMessage()); 
     } 
     return bytesToHex(encrypted); 
    } 
    public String decrypt(String code) throws Exception 
    { 
     if(code == null || code.length() == 0) 
      throw new Exception("Empty string"); 
     byte[] decrypted = null; 
     try { 
      cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec); 
      decrypted = cipher.doFinal(hexToBytes(code)); 
     } catch (Exception e) 
     { 
      e.printStackTrace(); 
      throw new Exception("[decrypt] " + e.getMessage()); 
     } 
     return Html.fromHtml(new String(decrypted)).toString().trim(); 
    } 
    public String bytesToHex(byte[] data) 
    { 
     if (data==null) 
     { 
      return null; 
     } 
     int len = data.length; 
     String str = ""; 
     for (int i=0; i<len; i++) { 
      if ((data[i]&0xFF)<16) 
       str = str + "0" + Integer.toHexString(data[i]&0xFF); 
      else 
       str = str + Integer.toHexString(data[i]&0xFF); 
     } 
     return str; 
    } 
    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 = 16; 
     int x = source.length() % size; 
     int padLength = size - x; 
     for (int i = 0; i < padLength; i++) 
     { 
      source += paddingChar; 
     } 
     return source; 
    } 
} 

现在，当我用弦数它的工作就像一个魅力。但现在它突然停了大串，此错误的工作：

java.lang.Exception: [encrypt] error:0607F08A:digital envelope routines:EVP_EncryptFinal_ex:data not multiple of block length 
12-18 15:32:42.057 21834-22054/com.app.aspire_pd W/System.err:  at com.app.aspire_pd.Other.MCrypt.encrypt(MCrypt.java:75) 
12-18 15:32:42.057 21834-22054/com.app.aspire_pd W/System.err:  at com.app.aspire_pd.AsyncTask.APIHit.HitAPI(APIHit.java:320) 
12-18 15:32:42.057 21834-22054/com.app.aspire_pd W/System.err:  at com.app.aspire_pd.AsyncTask.HitAPI.doInBackground(HitAPI.java:98) 
12-18 15:32:42.057 21834-22054/com.app.aspire_pd W/System.err:  at com.app.aspire_pd.AsyncTask.HitAPI.doInBackground(HitAPI.java:24) 
12-18 15:32:42.057 21834-22054/com.app.aspire_pd W/System.err:  at android.os.AsyncTask$2.call(AsyncTask.java:292) 
12-18 15:32:42.057 21834-22054/com.app.aspire_pd W/System.err:  at java.util.concurrent.FutureTask.run(FutureTask.java:237) 
12-18 15:32:42.057 21834-22054/com.app.aspire_pd W/System.err:  at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231) 
12-18 15:32:42.057 21834-22054/com.app.aspire_pd W/System.err:  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 
12-18 15:32:42.057 21834-22054/com.app.aspire_pd W/System.err:  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) 
12-18 15:32:42.057 21834-22054/com.app.aspire_pd W/System.err:  at java.lang.Thread.run(Thread.java:818) 

看到here我encrption线改为

cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); 

但就是不工作。

回答：

cipher = Cipher.getInstance("AES/CBC/PKCS5Padding","SC"); 

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