安卓HMAC顯示意外的錯誤

Question

我嘗試使用MD5生成HMAC，萬物似乎是完美的，但它顯示意外錯誤

的代碼如下

public String calcHmac(String src) throws Exception { 

     String key = "PFhNTD48VUlEPlNYWUFOR0VUPC9VSUQ+PEVUUkFOQVVUSD48WFNQUk9MRT5BbGw8L1hTUFJPTEU+PFhTUFNlY3VyaXR5SUQ+MzMzPC9YU1BTZWN1cml0eUlEPjxYU1BTZWN1cml0eUlEPjk5NzwvWFNQU2VjdXJpdHlJRD48WFNQU2VjdXJpdHlJRD5HQjwvWFNQU2VjdXJpdHlJRD48WFNQU2VjdXJpdHlJRD5YMDM8L1hTUFNlY3VyaXR5SUQ+PFhTUFNlY3VyaXR5SUQ+WDAxPC9YU1BTZWN1cml0eUlEPjxYU1BSZWNpcGllbnQ+NDlBQ0NULVNZQU5HRVRSQU48L1hTUFJlY2lwaWVudD48L0VUUkFOQVVUSD48L1hNTD4="; 
     SecretKeySpec keySpec = new SecretKeySpec(
       key.getBytes(), 
       "HmacMD5"); 

     Mac mac = Mac.getInstance("HmacMD5"); 
     mac.init(keySpec); 
     byte[] result = mac.doFinal(src.getBytes()); 
     return Hex.encodeHexString(result); 
    } 

Answer 1

試試這個

public static String sStringToHMACMD5(String s, String keyString) 
    { 
     String sEncodedString = null; 
     try 
     { 
      SecretKeySpec key = new SecretKeySpec((keyString).getBytes("UTF-8"), "HmacMD5"); 
      Mac mac = Mac.getInstance("HmacMD5"); 
      mac.init(key); 

      byte[] bytes = mac.doFinal(s.getBytes("ASCII")); 

      StringBuffer hash = new StringBuffer(); 

      for (int i=0; i<bytes.length; i++) { 
       String hex = Integer.toHexString(0xFF & bytes[i]); 
       if (hex.length() == 1) { 
        hash.append('0'); 
       } 
       hash.append(hex); 
      } 
      sEncodedString = hash.toString(); 
     } 
     catch (UnsupportedEncodingException e) {} 
     catch(InvalidKeyException e){} 
     catch (NoSuchAlgorithmException e) {} 
     return sEncodedString ; 
    } 

這一定會幫助你。

謝謝