Android中應用md5加密技術



md5加密方法如下，如此生成的是32位小寫密文

public class MD5 {
 // MD5変換
 public static String Md5(String str) {
  if (str != null && !str.equals("")) {
   try {
    MessageDigest md5 = MessageDigest.getInstance("MD5");
    char[] HEX = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
    byte[] md5Byte = md5.digest(str.getBytes("UTF8"));
    StringBuffer sb = new StringBuffer();
    for (int i = 0; i < md5Byte.length; i++) {
     sb.append(HEX[(md5Byte[i] & 0xff) / 16]);
     sb.append(HEX[(md5Byte[i] & 0xff) % 16]);
    }
    str = sb.toString();
   } catch (NoSuchAlgorithmException e) {
   } catch (Exception e) {
   }
  }
  return str;
 }
 
}