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PHP API data encryption

Below is the mcrypt method that I use to do for API data encryption


define('KRYPT_KEY', 'nextblog');

function encrypt($string) {
$iv_size = mcrypt_get_iv_size(MCRYPT_BLOWFISH, MCRYPT_MODE_ECB);
$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
return mcrypt_encrypt(MCRYPT_BLOWFISH, KRYPT_KEY, $string, MCRYPT_MODE_ECB, $iv);
}

/*** decrypt string ***/
function decrypt($crypttext) {
$iv_size = mcrypt_get_iv_size(MCRYPT_BLOWFISH, MCRYPT_MODE_ECB);
$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
return mcrypt_decrypt(MCRYPT_BLOWFISH, KRYPT_KEY, $crypttext, MCRYPT_MODE_ECB, $iv);
}



$userid = "94017";
$encodeduserid = base64_encode(encrypt($userid));
print 'Encoded Userid: ' . $encodeduserid;


$decodeduserid = trim(decrypt(base64_decode($encodeduserid)));
print 'Decoded Userid: ' . $decodeduserid;