Android的登陆MD5加密

1:导入代码

public class MD5Util {
    private static final String TAG = "MD5Util";

    /***
     * MD5加码 生成32位md5码
     */
    public static String string2MD5(String inStr) {
        Log.e(TAG, "string2MD5: -------------------------");
        MessageDigest md5 = null;
        try {
            md5 = MessageDigest.getInstance("MD5");
        } catch (Exception e) {
            System.out.println(e.toString());
            e.printStackTrace();
            return "";
        }
        char[] charArray = inStr.toCharArray();
        byte[] byteArray = new byte[charArray.length];

        for (int i = 0; i < charArray.length; i++)
            byteArray[i] = (byte) charArray[i];
        byte[] md5Bytes = md5.digest(byteArray);
        StringBuffer hexValue = new StringBuffer();
        for (int i = 0; i < md5Bytes.length; i++) {
            int val = ((int) md5Bytes[i]) & 0xff;
            if (val < 16)
                hexValue.append("0");
            hexValue.append(Integer.toHexString(val));
        }
        return hexValue.toString();

    }


    /**
     * 加密解密算法 执行一次加密，两次解密
     */
    public static String convertMD5(String inStr) {
        Log.e(TAG, "convertMD5: ----------------------------------------------------------");
        char[] a = inStr.toCharArray();
        for (int i = 0; i < a.length; i++) {
            a[i] = (char) (a[i] ^ 't');
        }
        String s = new String(a);
        return s;

    }


    //encrypt译成密码
    public String encrypt(String str) {
        // MD5
        String s1 = string2MD5(str);
        //加密
        //String s1 = MD5(str);


        String s = new String(str);

        Log.e(TAG, "show: ------------原始：" + s);
        Log.e(TAG, "show: ------------MD5后：" + string2MD5(s));
        Log.e(TAG, "show: ------------加密的：" + convertMD5(s));
        Log.e(TAG, "show: ------------解密的：" + convertMD5(convertMD5(s)));
        // return convertMD5(convertMD5(s));
        return convertMD5(s);
        //return string2MD5(s);

    }

    public String decode(String jiemi) {
        Log.e(TAG,"这是解密--------------*****---------"+ convertMD5(jiemi));
        return convertMD5(jiemi);
    }




    public static String MD5(String sourceStr) {
        try {
            // 获得MD5摘要算法的 MessageDigest对象
            MessageDigest mdInst = MessageDigest.getInstance("MD5");
            // 使用指定的字节更新摘要
            mdInst.update(sourceStr.getBytes());
            // 获得密文
            byte[] md = mdInst.digest();
            // 把密文转换成十六进制的字符串形式
            StringBuffer buf = new StringBuffer();
            for (int i = 0; i < md.length; i++) {
                int tmp = md[i];
                if (tmp < 0)
                    tmp += 256;
                if (tmp < 16)
                    buf.append("0");
                buf.append(Integer.toHexString(tmp));
            }
            //return buf.toString().substring(8, 24);// 16位加密
            return buf.toString();

        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
}

2:在LoginActivity加密

private MD5Util md5Util = new MD5Util();

mPwd2 = mPwd.getText().toString().trim();
if (mPwd2.isEmpty()) {
    Toast.makeText(this, "密码不能为空", Toast.LENGTH_LONG).show();
    return;
}
mPwd3 = md5Util.encrypt(mPwd2);