Hi, anyone has experience creating PayPal Encrypted Website Payment button?
I follow PayPal SDK example but the encrypted value is not correct.
I think the error should be with openssl_pkcs7_sign() since PayPal can
decrypt it with PayPal private key but does not recognize my signed data.
PayPal also told me that it is my encryption error.
Please kindly advice on the code below.
Thanks!
Keith
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//$buttonParams is key=value pair string with \n separation between each
key=value pair
$mypub = 'file://'.realpath('./mypubcert.pem');
$myprv = 'file://'.realpath('./myprvkey.pem');
$paypalpubcert= 'file://'.realpath('./paypal_cert_pem.pem');
$dataStrFile = realpath(tempnam('./tmp', 'pp_'));
$fd = fopen($dataStrFile, 'w');
fwrite($fd, $buttonParams);
fclose($fd);
$signedDataFile = realpath(tempnam('./tmp', 'pp_'));
openssl_pkcs7_sign($dataStrFile, $signedDataFile, $mypub, $myprv,array(),
PKCS7_BINARY);
unlink($dataStrFile);
$signedData = file_get_contents($signedDataFile);
$signedDataArray = explode("\n\n", $signedData); //I don't understand why
this code, just follow example only.
$signedData = base64_decode($signedDataArray[1]); //I don't understand why
this code, just follow example only.
unlink($signedDataFile);
$decodedSignedDataFile = realpath(tempnam('./tmp', 'pp_'));
$fd = fopen($decodedSignedDataFile, 'w');fwrite($fd,
$signedData);
fclose($fd);
$encryptedDataFile = realpath(tempnam('./tmp', 'pp_'));
openssl_pkcs7_encrypt($decodedSignedDataFile, $encryptedDataFile,
$paypalpubcert, array(), PKCS7_BINARY);
unlink($decodedSignedDataFile);
$encryptedData = file_get_contents($encryptedDataFile);
unlink($encryptedDataFile);
$encryptedDataArray = explode("\n\n", $encryptedData);
$encryptedData = trim(str_replace("\n", '', $encryptedDataArray[1])); //why
this?
$encryptedData = "-----BEGIN PKCS7-----".$encryptedData."-----END
PKCS7-----";
$encryptedBtn = "<form
action='https://www.sandbox.paypal.com/cgi-bin/webscr' method='post'><input
type='hidden' name='cmd' value='_s-xclick'><INPUT TYPE='hidden'
NAME='encrypted' VALUE='$encryptedData'><input type='image'
src='https://www.sandbox.paypal.com/en_US/i/btn/btn_paynowCC_LG.gif'
border='0' name='submit' alt='PayPal - The safer, easier way to pay
online!'><img alt='' border='0'
src='https://www.sandbox.paypal.com/en_US/i/scr/pixel.gif' width='1'
height='1'></form>";
echo $encryptedBtn ;
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