serpro / android-php-encrypt-decrypt

Encrypt / Decrypt Between Android and PHP and vice-versa

Android-PHP-Encrypt-Decrypt

Encrypt / Decrypt Between Android and PHP and vice-versa

HOW TO USE IT (JAVA)

MCrypt mcrypt = new MCrypt();

/* Encrypt */
String encrypted = MCrypt.bytesToHex( mcrypt.encrypt("Text to Encrypt") );

/* Decrypt */
String decrypted = new String( mcrypt.decrypt( encrypted ) );

HOW TO USE IT (PHP)

$mcrypt = new MCrypt();

/* Encrypt */
$encrypted = $mcrypt->encrypt("Text to encrypt");

/* Decrypt */
$decrypted = $mcrypt->decrypt($encrypted);

android-php-encrypt-decrypt's Issues

Read Simcard Serial Number and use it as Secret Key

problem with read on Android device, the Simcard Serial Number and use the first 16 Numbers as Secret Key

` import android.content.Context;
import android.telephony.TelephonyManager;

import java.security.NoSuchAlgorithmException;

import javax.crypto.Cipher;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class MCrypt {

Context mContext;
TelephonyManager mtelemamanger;
static char[] HEX_CHARS = {'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};
public String deviceid = mtelemamanger.getSimSerialNumber();
public String iv = new String (deviceid.substring(0, 16));
private static IvParameterSpec ivspec;
private static SecretKeySpec keyspec;
private static Cipher cipher;
private String SecretKey = "0123456789abcdef";//Dummy secretKey (CHANGE IT!)

public MCrypt ()    {
    ivspec = new IvParameterSpec(iv.getBytes());

    keyspec = new SecretKeySpec(SecretKey.getBytes(), "AES");

    try {
        cipher = Cipher.getInstance("AES/CBC/NoPadding");
    } catch (NoSuchAlgorithmException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (NoSuchPaddingException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

public MCrypt (Context context)//this is a constructor
{
    mContext = context;
    mtelemamanger = (TelephonyManager) mContext.getSystemService(Context.TELEPHONY_SERVICE);
}

    public byte[] encrypt(String text) throws Exception
{
    if(text == null || text.length() == 0)
        throw new Exception("Empty string");

    byte[] encrypted = null;

    try {
        cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);

        encrypted = cipher.doFinal(padString(text).getBytes());
    } catch (Exception e)
    {
        throw new Exception("[encrypt] " + e.getMessage());
    }

    return encrypted;
}

public static byte[] decrypt(String code) throws Exception
{
    if(code == null || code.length() == 0)
        throw new Exception("Empty string");

    byte[] decrypted = null;

    try {
        cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);

        decrypted = cipher.doFinal(hexToBytes(code));
        //Remove trailing zeroes
        if( decrypted.length > 0)
        {
            int trim = 0;
            for( int i = decrypted.length - 1; i >= 0; i-- ) if( decrypted[i] == 0 ) trim++;

            if( trim > 0 )
            {
                byte[] newArray = new byte[decrypted.length - trim];
                System.arraycopy(decrypted, 0, newArray, 0, decrypted.length - trim);
                decrypted = newArray;
            }
        }
    } catch (Exception e)
    {
        throw new Exception("[decrypt] " + e.getMessage());
    }
    return decrypted;
}


public static String bytesToHex(byte[] buf)
{
    char[] chars = new char[2 * buf.length];
    for (int i = 0; i < buf.length; ++i)
    {
        chars[2 * i] = HEX_CHARS[(buf[i] & 0xF0) >>> 4];
        chars[2 * i + 1] = HEX_CHARS[buf[i] & 0x0F];
    }
    return new String(chars);
}


public static byte[] hexToBytes(String str) {
    if (str==null) {
        return null;
    } else if (str.length() < 2) {
        return null;
    } else {
        int len = str.length() / 2;
        byte[] buffer = new byte[len];
        for (int i=0; i<len; i++) {
            buffer[i] = (byte) Integer.parseInt(str.substring(i*2,i*2+2),16);
        }
        return buffer;
    }
}



private static String padString(String source)
{
    char paddingChar = 0;
    int size = 16;
    int x = source.length() % size;
    int padLength = size - x;

    for (int i = 0; i < padLength; i++)
    {
        source += paddingChar;
    }

    return source;
}

} `

Is it really needed to have different IVs?

As far as I know (which is very little), the IV is used as a sort of nuance to generate different outputs despite having same content and same password.
Of course I know the password needs to be the same when encrypting/decrypting, but can't the IV be different? Doesn't the fact that both parties need to know the password AND iv make the IV concept redundant making it a sort of second password? Why not use the very same password for example?

java.lang.Exception: [encrypt] expected IV length of 16 but was 32

java.lang.Exception: [encrypt] expected IV length of 16 but was 32

Facing this issue
private String iv = "aeb3df8a92ac4b080ab9b5dd6e16e394";//Dummy iv (CHANGE IT!)
private String SecretKey = "493e61e6dd5b9ba080b4ca29a8fd3bea";//Dummy secretKey (CHANGE IT!)

Android and PHP both are getting different Encrypted Value.

String---> "qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm"

Android Encrypted Value---> "b8eccae23aa47f2b60f664df5353f337cb942c70c8d8f14d123f9b04d29f1fc8e4295c42ea767562e28262f5d6d16180db4b8666032c375202deb446b659f081c8c9c7d463a4b36f5a7a5fea87b6bb6d8a1a428995f279ce6309794b3531dc09"

Php Encrypted Value--->"b8eccae23aa47f2b60f664df5353f337cb942c70c8d8f14d123f9b04d29f1fc8e4295c42ea767562e28262f5d6d16180db4b8666032c375202deb446b659f081c8c9c7d463a4b36f5a7a5fea87b6bb6d"

The problem is php is not giving the entire value, Please have a look at dark characters in encrypted value.

Note: if my String is small then it works fine. The problem only happens if String length exceeds 64 characters.

Thanks.

Android Live Stream APP

Hello.thanks for code.can u give me any documentation how to integrate this to my Android Live TV Application.which use API from PHP Server to get the streaming links.
Can we encrypt the links with this.

Decrypt file in Android

In php i'm encrypt file
$mcrypt->encrypt(fread($handle, 4096));

how decrypt it's in android?

Json Decryption

java.lang.Exception: [decrypt] Invalid int: "{ "

i am getting this error how to resolve it ?

Problem integrating it on Android

Hi
When i try to do this:

import com.myproject.MCrypt;

MCrypt mcrypt = new MCrypt();
String decrypting = new String(mcrypt.decrypt(myencryptedtext));

Java ask me to add exception:

        MCrypt mcrypt = new MCrypt();
        try {
            String decrypting = new String(mcrypt.decrypt(myencryptedtext));
            Log.w("decrypting", decrypting );
        } catch (Exception e) {

        }

But nothing returned in the LOGS !

Can you help me please ?

getting error

encrypt data not block size aligned

HEX_CHARS not defined ?

https://github.com/SeRPRo/Android-PHP-Encrypt-Decrypt/blob/master/Java/src/com/serpro/library/String/MCrypt.java#L81

doesn work for Video

Hi, I need to use this API, but before use, I just did plain test, where PHP encryption decryption worked for txt, docx etc but when it comes to video, it fails. I also noticed there initial space was erased, trim removes it.

Strange chars

hi,
i still have strange ?? characters in Java when decrypting.

Error when use php 7

hi
when use php version 7 not work and get error {main} thrown in MCrypt.php on line 11

please check this bug

thanks

Objective C equivalent for this.

I want to use this in my PHP server side API and in Android App and iOS app.
Working fine with the above code in PHP and Android.

Now need full code for the iOS equivalent for this. Can anyone have this.. please

How to Encrypt UTF-8 Charset

Hi
How to Encrypt utf-8 Charset?(Persian-arabic)

Thank You Mr.Serpro

Can not encrypt & decrypt JPG file

I want to encrypt and then decrypt .jpg file

Here is the code snippet I use:

$crypter = new MCrypt();
// encrypt
file_put_contents('dst.ejp', $crypter->encrypt(file_get_contents('src.jpg')));
// decrypt
file_put_contents('dst-decrypted.jpg', $crypter->decrypt(file_get_contents('dst.ejp')));

but the final dst-decrypted.jpg is not a valid image file anymore.

Any suggestions? I'm using PHP 5.4.20

Alternative for Ionic 2 Framework

I implemented this method in Android and PHP. But now after creating the same app in Ionic 2 for iOS need to perform the same process in ionic 2 (typescript). Any help would be wonderful.

Security "Crypto" provider deprecated in Android N

https://android-developers.googleblog.com/2016/06/security-crypto-provider-deprecated-in.html
The deprecation affects this logic, right ?

Alternative For Swift

Is their any alternative solution for Swift?

UMD Research Study

Hi there,
We are researchers from the University of Maryland conducting a study about software code reuse. If you are interested in helping us in this study​ through ​a short interview about this project, please contact us on ​[email protected]​ for more information​. You will be ​compensated for your time.

Special Characters?

Hi, I'm loosing special characters when I encrypt in Android and decrypt in PHP. For example, encrypting "Agresión Agravada" ends up being "AgresiÃ�³n Agravada" when decrypted in PHP. The PHP function does say:
return utf8_encode(trim($decrypted));
but I don't understand why the "ó" is not being decrypted.

Thanks!

PS. I'm also using ZeroBytePadding instead of NoPadding because NoPadding would give me this error: java.lang.Exception: [encrypt] data not block size aligned

Can you provide Objective-c / Swift code

I want to implement this in my IOS project. Is their any alternative solution for Objective-c / Swift code?

Can't encrypt unicode string - Java

Hi,

I have try to use your code to encrypt utf8 string but got an errr: javax.crypto.IllegalBlockSizeException: data not block size aligned.

Could you help to fix, please?

Android MCrypt decode Invalid int

Currently testing encrypt-decrypt functions for Android side.

Plain text is "You should be able to read this, bro."
iv = 483e705e5a7f270f;
secretKey = 53c7a330f1bf93d6;

encrypt output is "j:�Xg֎� �T;�H��ZA�����7�(�yJ1$(�[d�{�$�����ûD"
decrypt gives out an error: java.lang.Exception: [decrypt] Invalid int: "j:"

Arabic issue

Not able encrypt arabic strings

Alternative solution for iOS swift