sha1加密java代码

Posted 2023-02-16 guanhang89

    public static String getSha1(String str)
        if(str==null||str.length()==0)
            return null;
        
        char hexDigits[] = '0','1','2','3','4','5','6','7','8','9',
                'a','b','c','d','e','f';
        try 
            MessageDigest mdTemp = MessageDigest.getInstance("SHA1");
            mdTemp.update(str.getBytes("UTF-8"));

            byte[] md = mdTemp.digest();
            int j = md.length;
            char buf[] = new char[j*2];
            int k = 0;
            for (int i = 0; i < j; i++) 
                byte byte0 = md[i];
                buf[k++] = hexDigits[byte0 >>> 4 & 0xf];
                buf[k++] = hexDigits[byte0 & 0xf];      
            
            return new String(buf);
         catch (Exception e) 
            // TODO: handle exception
            return null;