Spanish Como hago un encrypt/decrypt

[bollanog]

Hola buenos días, hay alguna forma de usar la misma función de php pero hacerla en b4a? he tratado pero no encuentro suficiente información, anexo mi código de php. Lo ideal es que si genero en php me funcione también en b4a.

function encrypt_decrypt($action, $string) {
    $output = false;

    $encrypt_method = "AES-256-CBC";
    $secret_key = 'This is my secret key1';
    $secret_iv = 'This is my secret ivs';

    // hash
    $key = hash('sha256', $secret_key);
    
    // iv - encrypt method AES-256-CBC expects 16 bytes - else you will get a warning
    $iv = substr(hash('sha256', $secret_iv), 0, 16);

    if ( $action == 'encrypt' ) {
        $output = openssl_encrypt($string, $encrypt_method, $key, 0, $iv);
        $output = base64_encode($output);
    } else if( $action == 'decrypt' ) {
        $output = openssl_decrypt(base64_decode($string), $encrypt_method, $key, 0, $iv);
    }

    return $output;
}

 

[TILogistic]

Yo he usado esto en mis proyectos y creo que es lo que buscas:

B4x / PHP compatibility thread

A lot of developers like me use php as the backend component on a server to communicate with B4x apps. My intention is to create a thread with some "How to's" and best practices. Please feel free to expand it. It's not the place to post questions (please open a new thread then). The examples...

www.b4x.com

Actualizado:

[B4x] AES-256 encryption with salt and iv (works with all platforms like php, .net, etc.)

This example is based on agrahams encryption library: Encryption Lib 1. Generate a 32 byte pw (just call the sub) and store it 2. Encrypt the data by calling AES_Encrypt. Return is a byte array or a base64 encoded string 3. Salt is a random value which is added at the beginning of the encrypted...

www.b4x.com

librería:

Base64 and Encryption library

Here's a library that, for the moment, can perform Base64 encoding and decoding and symmetric algorithm encryption and decryption. Tested symmetric algorithms are DES, Triple DES and AES (Rijndael). As the Java encryption rountines are all byte array oriented you will need my ByteConverter...

www.b4x.com

 

[bollanog]

Si yo lo estaba revisando pero me marca un error en

Return SU.EncodeBase64(SaltIVMessage)

No se de donde sale la variable SU he igual con

BC.ArrayCopy(Salt,0,SaltIVMessageBytes,0,32)
BC.ArrayCopy(IV,0,SaltIVMessageBytes,32,16)
BC.ArrayCopy(Message,0,SaltIVMessageBytes,48,Message.Length)

 

[Ingeniero Cognitivo]

Existe una libreria de encriptacion, por lo tanto quizas si exista.

 

[TILogistic]

SU

B4A - StringUtils

BC
https://www.b4x.com/android/help/byteconverter.html

ByteConverter library

It's occasionally useful to be able to poke around in things as arrays of bytes so this library lets you do it. It can transform arrays of primitive types to and from arrays of bytes with the "endian-ness" of the conversion specified. If you need endian-ness you will either know about it or...

www.b4x.com

 

[bollanog]

Muchas gracias, use este post https://www.b4x.com/android/forum/threads/b4x-php-compatibility-thread.84473/#post-616967 para el php y gracias @oparra por decirme las librerias