check Password Strong Level - Android java.security

Android examples for java.security:Password

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Description

check Password Strong Level

Demo Code


import android.support.annotation.IntRange;
import java.util.HashSet;
import java.util.Objects;
import java.util.Set;
import java.util.regex.Pattern;

public class Main{
    private static final Set<String> dictionary = new HashSet<>();
    private static final Pattern numPattern = Pattern.compile("^[0-9]+$");
    public static int checkPwdStrong(String pwd, int minLen, int maxLen) {
        maxLen = Math.max(maxLen, minLen);

        int level = 1;
        String lowerPwd = pwd.toLowerCase();

        if (containsSmallAToZ(lowerPwd))
            level++;//w  w w.ja  va  2  s  . c o m
        if (containsBiggerAToZ(pwd))
            level++;
        if (containsNumber(lowerPwd))
            level++;
        if (contains_(lowerPwd))
            level++;

        if ((containsSmallAToZ(lowerPwd) && containsNumber(lowerPwd))
                || (containsSmallAToZ(lowerPwd) && contains_(lowerPwd))
                || (containsNumber(lowerPwd) && contains_(lowerPwd)))
            level++;
        if (containsSmallAToZ(lowerPwd) && containsNumber(lowerPwd)
                && contains_(lowerPwd))
            level++;
        //        if(lowerPwd.length() < (minLen + maxLen) / 2 && lowerPwd.length() >= minLen)
        if (lowerPwd.length() < minLen)
            level--;
        if (lowerPwd.length() > 1) {
            boolean allEquals = true;
            char firstChar = pwd.charAt(0);
            for (char c : pwd.toCharArray())
                if (c != firstChar) {
                    allEquals = false;
                    break;
                }

            if (allEquals)
                return 0;
        }

        if (isNumberSequence(lowerPwd))
            level--;

        if ("abcdefghijklmnopqrstuvwxyz".contains(lowerPwd))
            level--;

        if ("qwertyuiop".contains(pwd) || "asdfghjkl".contains(pwd)
                || "zxcvbnm".contains(pwd))
            level--;

        if (lowerPwd.length() % 2 == 0) {
            String part1 = pwd.substring(0, pwd.length() / 2);
            String part2 = pwd.substring(pwd.length() / 2);
            if (part1.equals(part2))
                level--;
        }

        if (pwd.length() % 3 == 0) {
            String part1 = pwd.substring(0, pwd.length() / 3);
            String part2 = pwd.substring(pwd.length() / 3,
                    pwd.length() / 3 * 2);
            String part3 = pwd.substring(pwd.length() / 3 * 2);
            if (part1.equals(part2) && part2.equals(part3))
                level--;
        }

        if (numPattern.matcher(pwd).matches()) {
            if (pwd.length() == 8) {
                int year = Integer.valueOf(pwd.substring(0, 4));
                int month = Integer.valueOf(pwd.substring(4, 6));
                int day = Integer.valueOf(pwd.substring(5, 7));
                if (year >= 1000 && year < 2100 && month >= 1
                        && month <= 12 && day >= 1 && day <= 31) {
                    level--;
                }
            }
        }

        if (dictionary.contains(lowerPwd))
            level--;

        level = Math.min(level, 5);
        level = Math.max(level, 0);

        return level;
    }
    public static boolean containsSmallAToZ(String str) {
        for (char c : str.toCharArray())
            if (c >= 'a' && c <= 'z')
                return true;
        return false;
    }
    public static boolean containsBiggerAToZ(String str) {
        for (char c : str.toCharArray())
            if (c >= 'A' && c <= 'Z')
                return true;
        return false;
    }
    public static boolean containsNumber(String str) {
        for (char c : str.toCharArray())
            if (c >= '0' && c <= '9')
                return true;
        return false;
    }
    public static boolean contains_(String str) {
        for (char c : str.toCharArray())
            for (char special : Constants.SPECIAL_CHARS)
                if (c == special)
                    return true;
        return false;
    }
    public static boolean isNumberSequence(String str) {
        if (str.length() < 2)
            return false;

        if ("01234567890".contains(str) || "09876543210".contains(str))
            return true;

        return false;
    }
}

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