MD5转化通用类

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * MD5 转化类
 * 
 * @author Fu Wei
 * 
 */
public class MD5Utils {

	private static final Logger LOG = LoggerFactory
			.getLogger(MD5Utils.class);

	public static byte[] getMd5Key(byte[] buffer, byte[] key) {
		try {
			MessageDigest md5 = MessageDigest.getInstance("MD5");
			md5.update(buffer);
			return md5.digest(key);
		} catch (NoSuchAlgorithmException e) {
		}
		return null;
	}

	/**
	 * 输入原文 返回MD5码
	 * 
	 * @param strSrc
	 * @param key
	 * @param encode
	 * @return
	 */
	public static String getMd5Key(String strSrc, String key, String encode) {
		try {
			MessageDigest md5 = MessageDigest.getInstance("MD5");
		 	md5.update(strSrc.getBytes(encode));
			String result = "";
			byte[] temp;
		 	temp = md5.digest(key.getBytes(encode));
			for (int i = 0; i < temp.length; i++) {
				result += Integer.toHexString(
						(0x000000ff & temp[i]) | 0xffffff00).substring(6);
			}
			return result;
		} catch (NoSuchAlgorithmException e) {
			LOG.error("MD5计算出错", e);
		} catch (Exception e) {
			LOG.error("MD5装换出错", e);
		}
		return null;
	}
}