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(PHP 4 >= 4.0.4, PHP 5)

openssl_sign -- Generate signature

Description

bool openssl_sign ( string data, string &signature, mixed priv_key_id [, int signature_alg] )

Warning

This function is EXPERIMENTAL . The behaviour of this function, the name of this function, and anything else documented about this function may change without notice in a future release of PHP. Use this function at your own risk.

Returns TRUE on success or FALSE on failure. If successful the signature is returned in signature .

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.

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);
?>

Related Function(s)

openssl_verify()