Android开发库VUtils之MD5加密

package com.v.vutils.utils;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5Utils {

protected static char[] sHexDigits = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e',
'f' };

public static String getMD5String(String str) {
if (str == null)
return null;
return getMD5String(str.getBytes());
}

public static String getMD5String(byte[] bytes) {
try {
MessageDigest messageDigest = MessageDigest.getInstance("MD5");
bytes = messageDigest.digest(bytes);
StringBuffer stringbuffer = new StringBuffer();
for (int i = 0; i < bytes.length; i++) {
byte b = bytes[i];
char c0 = sHexDigits[((b & 0xF0) >> 4)];
stringbuffer.append(c0);
char c1 = sHexDigits[(b & 0x0F)];
stringbuffer.append(c1);
}
return stringbuffer.toString();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return null;
}
}

String string = MD5Utils.getMD5String("123456789");

25f9e794323b453885f5181f1b624d0b