com.github.javaclub.toolbox.crypt.SimpleEncryptor Maven / Gradle / Ivy

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package com.github.javaclub.toolbox.crypt;

import com.github.javaclub.toolbox.ToolBox.Strings;

public class SimpleEncryptor {

    private SimpleEncryptor() {}
    
    public final static boolean isTooSimple(String password) {
		if(Strings.isBlank(password) || 6 > password.trim().length()) {
			return true;
		}
		String pwd = password.trim();
		if(6 == pwd.length() && Strings.isNumeric(pwd)) {
			return true;
		}
		
		return false;
}

    /**
     * Encrypts the specified string.
     * 
     * @param input the string to encrypt.
     * @return the encrypted string.
     */
    public static String encrypt(String input) {
        StringBuilder sResult = new StringBuilder();
        for (int i = 0; i < input.length(); i++) {
            int iAsc = input.charAt(i);

            if (iAsc >= 97 && iAsc <= 109) {
                iAsc = iAsc + 13; //a ... m inclusive become n ... z
            }
            else if (iAsc >= 110 && iAsc <= 122) {
                iAsc = iAsc - 13; //n ... z inclusive become a ... m
            }
            else if (iAsc >= 65 && iAsc <= 77) {
                iAsc = iAsc + 13; //A ... M inclusive become N ... Z
            }
            else if (iAsc >= 78 && iAsc <= 90) {
                iAsc = iAsc - 13; //N ... Z inclusive become A ... M
            }
            sResult.append((char) iAsc);
        }
        return sResult.toString();
    }

    /**
     * Decrypts the encrypted string.
     * 
     * @param encrypted a encrypted string.
     * @return the original string before encrypted.
     */
    public static String decrypt(String encrypted) {
        return encrypt(encrypted);
    }
    
    public static void main(String[] args) {
		String s = "haha我";
		String encrypt = SimpleEncryptor.encrypt(s);
		System.out.println(encrypt);
		String decrypt = SimpleEncryptor.decrypt(encrypt);
		System.out.println(decrypt);
	}

}