从设置安装包里的 Dex 找出了一串代码，能不能告诉我它写了什么？(代码已转成 Java )

[Intangiblew]

package com.android.settings;

import android.content.Context;
import android.content.Intent;
import android.os.Build;
import android.os.SystemProperties;
import android.provider.Settings;
import android.util.Log;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Calendar;

public class DevelopmentUtils {
private static final String MD5_ALGORITHM = "md5";
private static final String OKAY_DEFAULT = "@okjiaoyu.cn";
private static final String TAG = "DevelopmentUtils";
private static MessageDigest md5;

public DevelopmentUtils() {
}

static {
try {
md5 = MessageDigest.getInstance("md5");
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
}

public static String getEnterDevPassword() {
String md5Result = encrypt(getVerificationMsg());
return md5Result.substring(md5Result.length() - 6, md5Result.length());
}

private static String encrypt(String str) {
return encryptMD5ReturnEvenNumber(encryptMD5ReturnOddNumber(str));
}

public static String encryptMD5ReturnOddNumber(String plainText) {
String result;
byte[] cipherData = md5.digest(plainText.getBytes());
StringBuilder oddNumber = new StringBuilder();
for (byte cipher : cipherData) {
String toHexStr = Integer.toHexString(cipher & 255);
if (toHexStr.length() == 1) {
result = "0" + toHexStr;
} else {
result = toHexStr;
}
oddNumber.append(result.charAt(0));
}
return oddNumber.toString();
}

public static String encryptMD5ReturnEvenNumber(String plainText) {
String result;
byte[] cipherData = md5.digest(plainText.getBytes());
StringBuilder oddNumber = new StringBuilder();
for (byte cipher : cipherData) {
String toHexStr = Integer.toHexString(cipher & 255);
if (toHexStr.length() == 1) {
result = "0" + toHexStr;
} else {
result = toHexStr;
}
oddNumber.append(result.charAt(1));
}
return oddNumber.toString();
}

private static String dynamicStr(int month, int day) {
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.append(String.valueOf(month)).append("month").append("-").append(String.valueOf(day)).append("day");
return stringBuilder.toString();
}

public static String encryptMD5(String plainText) {
byte[] cipherData = md5.digest(plainText.getBytes());
StringBuilder builder = new StringBuilder();
for (byte cipher : cipherData) {
String toHexStr = Integer.toHexString(cipher & 255);
if (toHexStr.length() == 1) {
toHexStr = "0" + toHexStr;
}
builder.append(toHexStr);
}
return builder.toString();
}

public static String getVerificationMsg() {
String sequenceNumber = Build.SERIAL;
Calendar c = Calendar.getInstance();
int year = c.get(1);
int month = c.get(2) + 1;
int day = c.get(5);
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.append(sequenceNumber).append(String.valueOf(year)).append(String.valueOf(month)).append(String.valueOf(day)).append("@okjiaoyu.cn").append(dynamicStr(month, day));
return stringBuilder.toString();
}

public static boolean isEnterDevelpment(Context context) {
boolean showDev = context.getSharedPreferences("development", 0).getBoolean("show", Build.TYPE.equals("eng"));
Log.d("DevelopmentUtils", "isEnterDevelpment showDev=" + showDev);
return showDev;
}

public static void exitDevelpment(Context context) {
context.startService(new Intent(context, CheckService.class));
Settings.Global.putInt(context.getContentResolver(), "adb_enabled", 0);
Settings.System.putInt(context.getContentResolver(), "usb_storage_enable", 0);
Settings.System.putInt(context.getContentResolver(), "xdf_apk_install_enable", 0);
Settings.System.putInt(context.getContentResolver(), "net_white_list_enable", 1);
Settings.System.putInt(context.getContentResolver(), "launcher_white_list_enable", 1);
Settings.Secure.putInt(context.getContentResolver(), "bugreport_in_power_menu", 0);
Settings.Global.putInt(context.getContentResolver(), "stay_on_while_plugged_in", 0);
Settings.Secure.putInt(context.getContentResolver(), "bluetooth_hci_log", 0);
Utils.setOemUnlockEnabled(context, false);
Settings.Secure.putInt(context.getContentResolver(), "mock_location", 0);
Settings.System.putInt(context.getContentResolver(), "sd_card_enable", 0);
SystemProperties.set("persist.sys.sdcard_enable", "0");
context.getSharedPreferences("development", 0).edit().putBoolean("show", false).apply();
}
}

[yulihao]

说实话我第一眼看到以为是 C#
不会，留给下一位，告辞

[asionbo]

写了一些 android 工具类😀，进入开发模式的密码加解密

[Intangiblew]

@asionbo 能不能说说密码是怎么设置的？