md5加密

最新推荐文章于 2020-04-11 21:07:55 发布

songhongrun2010

最新推荐文章于 2020-04-11 21:07:55 发布

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文章标签：加密 string byte null system class

本文链接：https://blog.youkuaiyun.com/songhongrun2010/article/details/6514438

版权

package test;

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

/**
* MD5 操作
* @author Administrator
*
*/
public class MD5Encrypt {

public static String md5(String text) {
MessageDigest msgDigest = null;

        try {
            msgDigest = MessageDigest.getInstance("MD5");
        } catch (NoSuchAlgorithmException e) {
            throw new IllegalStateException(
                    "System doesn't support MD5 algorithm.");
        }
        msgDigest.update(text.getBytes());
        byte[] bytes = msgDigest.digest();

        byte tb;
        char low;
        char high;
        char tmpChar;

String md5Str = new String();

for (int i = 0; i < bytes.length; i++) {
tb = bytes[i];

tmpChar = (char) ((tb >>> 4) & 0x000f);

            if (tmpChar >= 10) {
                high = (char) (('a' + tmpChar) - 10);
            } else {
                high = (char) ('0' + tmpChar);
            }
            md5Str += high;
            tmpChar = (char) (tb & 0x000f);
            if (tmpChar >= 10) {
                low = (char) (('a' + tmpChar) - 10);
            } else {
                low = (char) ('0' + tmpChar);
            }

md5Str += low;
}

return md5Str;
}

    public static byte[] encrypt(byte[] obj) {
        try {
            MessageDigest md5 = MessageDigest.getInstance("MD5");
            md5.update(obj);
            return md5.digest();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return null;
    }

    public static void main(String args[]){

// System.out.println(Md5Encrypt.md5("jinxin"));

    }

}