Signature¶
Signature has several meanings:
Method signature: the name, arguments, attributes and return type of a method or function
Digital signature: a piece of data that gives a recipient confidence that the message came from a specific sender
Email signature: a suffix for email messages, to conclude a email message with coordinates and social greetings.
<?php
// The line below is the function signature
function foo(string $message): string {
// adapted from the PHP manual
// fetch private key from file and ready it
$pkeyid = openssl_pkey_get_private(file://src/openssl-0.9.6/php/sign/key.pem);
// compute signature
openssl_sign($message, $signature, $pkeyid);
// free the key from memory
openssl_free_key($pkeyid);
// This returns the signature of the message for 'php' user.
// It may be checked with the public key
return $signature;
}
?>
Related : Method Signature, Digital Signature
