m_crypto.php

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<?php

class m_crypto
{
    function encrypt($sValue, $sSecretKey)
    {
        return rtrim(
            base64_encode(
                mcrypt_encrypt(
                MCRYPT_RIJNDAEL_256,
                $sSecretKey, $sValue,
                MCRYPT_MODE_ECB,
                mcrypt_create_iv(
                    mcrypt_get_iv_size(
                    MCRYPT_RIJNDAEL_256,
                    MCRYPT_MODE_ECB
                    ),
                    MCRYPT_RAND
                )
            )
            ), "\0"
        ); 
    }

    function decrypt($sValue, $sSecretKey)
    {
        return rtrim(
        mcrypt_decrypt(
            MCRYPT_RIJNDAEL_256, 
            $sSecretKey, 
            base64_decode($sValue), 
            MCRYPT_MODE_ECB,
            mcrypt_create_iv(
            mcrypt_get_iv_size(
                MCRYPT_RIJNDAEL_256,
                MCRYPT_MODE_ECB
            ), 
            MCRYPT_RAND
            )
        ), "\0"
        );
    }

}