bpm_encryption.php

<?php

/**
 * @param $data
 * @return string
 */
function bpm_encrypt_enc_pan($data)
{
    return bin2hex(openssl_encrypt(hex2bin($data), 'des-ecb', hex2bin('2C7D202B960A96AA'), OPENSSL_NO_PADDING));
}

/**
 * @param $data
 * @return string
 */
function bpm_encrypt_enc($data)
{
    return bin2hex(openssl_encrypt(pkcs_padding(hex2bin($data), 8), 'des-ecb', hex2bin('2C7D202B960A96AA'), OPENSSL_NO_PADDING));
}

/**
 * @param $str
 * @param $blocksize
 * @return string
 */
function pkcs_padding($str, $blocksize)
{
    $pad = $blocksize - (strlen($str) % $blocksize);
    return $str . str_repeat(chr($pad), $pad);
}