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openssl_sign

Generate signature (PHP 4 >= 4.0.4, PHP 5)
bool openssl_sign ( string data, string &signature, mixed priv_key_id [, int signature_alg] )

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.

Parameters

data
signature

If the call was successful the signature is returned in signature.

priv_key_id
signature_alg

Defaults to OPENSSL_ALGO_SHA1. For more information see the list of Signature Algorithms.

Return Values

Returns TRUE on success or FALSE on failure.

ChangeLog

VersionDescription
5.0.0 The signature_alg parameter was added.

Examples

Example 1677. 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);
?>