How can I encrypt a string with RSA using a given public key - using ColdFusion 7?

I will receive from a 3rd Party website a public key (exponent and modulus) and I need to encrypt a string with the given key to send the data encrypted.

The Production environment is ColdFusion 7.

I need to use RSA

I'm having some trouble to do this, I don´t know how to encrypt using the key.
Any suggestions of a reliable 3rd party custom tag or alternative?

Note: The 3rd party site has provided the following documentation but it is for PHP.

PHP

This sample requires the use of phpseclib
Ensure that prior to encoding with the RSA algorithm your string is encoded as Unicode (UTF-16 Little Endian).


01 require_once('Crypt/RSA.php');
02       
03      function EncryptMyQueryString($accountLoginType, $userName, $password) {
04          return RSAEncrypt($accountLoginType . "|" . $userName . "|" . $password);
05      }
06      function RSAEncrypt($dataToEncrypt) {
07          $publicKey = '<RSAKeyValue>
08                            <Modulus>uno9DsYcaZ1yAqY20nIM+YjYjjFsGx0DYm7lBGxbmVLLZTYc9MaI0Br+
09                            8ElcuZVVNRmGeVBlkcHT3JpMDf/fiWSho6o0pRhQZmnG4RZtCWnGjFTV+
10                            QWBYcuTGoQFKOtsrGqG16XwL2hPxqYW/7nzBVgAGe6myG3hMou8P4DSpjk=</Modulus>
11                            <Exponent>AQAB</Exponent>
12                            </RSAKeyValue>';
13             $xml = new DOMDocument();
14             $xml->loadXML($publickey);
15       
16             $modulus = new Math_BigInteger(base64_decode($xml->getElementsByTagName('Modulus')->item(0)->nodeValue), 256);
17             $exponent = new Math_BigInteger(base64_decode($xml->getElementsByTagName('Exponent')->item(0)->nodeValue), 256);
18             $key = array('modulus' => $modulus, 'publicExponent' => $exponent);
19       
20             $rsa = new Crypt_RSA();
21       
22             $rsa->loadkey($key, CRYPT_RSA_PUBLIC_FORMAT_RAW);
23             $rsa->setEncryptionMode(CRYPT_RSA_ENCRYPTION_PKCS1);
24       
25             $plainbytes = mb_convert_encoding($dataToEncrypt,"UTF-16LE", "auto");
26             $res = $rsa->encrypt($plainbytes);
27       
28             return  base64_encode ( $res );
29      }
30       
31      echo EncryptMyQueryString('loginTypeName', 'userName', 'p@s$w0rd1@');