(PHP 4 >= 4.0.4, PHP 5)
openssl_sign — Generate signature
$data
, string &$signature
, mixed $priv_key_id
[, int $signature_alg = OPENSSL_ALGO_SHA1
] )
openssl_sign() computes a signature for the
specified data by using SHA1 for hashing
followed by encryption using the private key associated with
priv_key_id. Note that the data itself is
not encrypted.
data
signature
If the call was successful the signature is returned in
signature.
priv_key_id
signature_alg
For more information see the list of Signature Algorithms.
Returns TRUE on success or FALSE on failure.
| Version | Description |
|---|---|
| 5.0.0 |
The signature_alg parameter was added.
|
Example #1 openssl_sign() example
<?php
// $data is assumed to contain the data to be signed
// fetch private key from file and ready it
$fp = fopen("/src/openssl-0.9.6/demos/sign/key.pem", "r");
$priv_key = fread($fp, 8192);
fclose($fp);
$pkeyid = openssl_get_privatekey($priv_key);
// compute signature
openssl_sign($data, $signature, $pkeyid);
// free the key from memory
openssl_free_key($pkeyid);
?>