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Ejemplo de implementación en PHP

Ejemplo de cálculo de firma utilizando el algoritmo HMAC-SHA-256:

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($name,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;
 }

Ejemplo de cálculo de firma utilizando el algoritmo SHA-1:

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($name,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 ;
}
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