Example of implementation with PHP
Example of signature computation using the HMAC-SHA-256 algorithm:
function getSignature ($params, $key)
{
/**
*Function that computes the signature.
* $params : table containing the fields to send in the payment form.
* $key : TEST or PRODUCTION key
*/
//Initialization of the variable that will contain the string to encrypt
$signature_content = "";
//sorting fields alphabetically
ksort($params);
foreach($params as $name=>$value){
//Recovery of vads_ fields
if (substr($nom, 0, 5)=='vads_'){
//Concatenation with "+"
$signature_content .= $value."+";
}
}
//Adding the key at the end
$signature_content .= $key;
//Encoding base64 encoded chain with SHA-256 algorithm
$signature = base64_encode(hash_hmac('sha256', $signature_content, $key, true));
return $signature;
} Example of signature computation using the SHA-1 algorithm:
function getSignature($params, $key)
{
/**
* Function that computes the signature.
* $params : table containing the fields to send in the payment form.
* $key : TEST or PRODUCTION key
*/
//Initialization of the variable that will contain the string to encrypt
$signature_content = "" ;
// Sorting fields alphabetically
ksort($params);
foreach ($params as $name =>$value)
{
// Recovery of vads_ fields
if (substr($nom, 0, 5)=='vads_') {
// Concatenation with "+"
$signature_content .= $value."+";
}
}
// Adding the key at the end
$signature_content .= $key;
// Applying SHA-1 algorithm
$signature = sha1($signature_content);
return $signature ;
}