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Description

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

Возвращает TRUE в случае успешного завершения или FALSE в случае возникновения ошибки. 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.

Замечание: Optional 4th parameter signature_alg was added in version 5.0.0. Its default value is OPENSSL_ALGO_SHA1. For more information see the list of Signature Algorithms.

Пример 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); ?>

See also openssl_verify().

add a note User Contributed Notes
openssl_sign

edmarw at yahoo dot com
04-Sep-2007 09:22


This may help if you just want a real-simple private/public key pair:



<?php



$data = "Beeeeer is really good.. hic...";



// You can get a simple private/public key pair using:

// openssl genrsa 512 >private_key.txt

// openssl rsa -pubout <private_key.txt >public_key.txt



// IMPORTANT: The key pair below is provided for testing only. 

// For security reasons you must get a new key pair

// for production use, obviously.



$private_key = <<<EOD

-----BEGIN RSA PRIVATE KEY-----

MIIBOgIBAAJBANDiE2+Xi/WnO+s120NiiJhNyIButVu6zxqlVzz0wy2j4kQVUC4Z

RZD80IY+4wIiX2YxKBZKGnd2TtPkcJ/ljkUCAwEAAQJAL151ZeMKHEU2c1qdRKS9

sTxCcc2pVwoAGVzRccNX16tfmCf8FjxuM3WmLdsPxYoHrwb1LFNxiNk1MXrxjH3R

6QIhAPB7edmcjH4bhMaJBztcbNE1VRCEi/bisAwiPPMq9/2nAiEA3lyc5+f6DEIJ

h1y6BWkdVULDSM+jpi1XiV/DevxuijMCIQCAEPGqHsF+4v7Jj+3HAgh9PU6otj2n

Y79nJtCYmvhoHwIgNDePaS4inApN7omp7WdXyhPZhBmulnGDYvEoGJN66d0CIHra

I2SvDkQ5CmrzkW5qPaE2oO7BSqAhRZxiYpZFb5CI

-----END RSA PRIVATE KEY-----

EOD;

$public_key = <<<EOD

-----BEGIN PUBLIC KEY-----

MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBANDiE2+Xi/WnO+s120NiiJhNyIButVu6

zxqlVzz0wy2j4kQVUC4ZRZD80IY+4wIiX2YxKBZKGnd2TtPkcJ/ljkUCAwEAAQ==

-----END PUBLIC KEY-----

EOD;



$binary_signature = "";



// At least with PHP 5.2.2 / OpenSSL 0.9.8b (Fedora 7)

// there seems to be no need to call openssl_get_privatekey or similar.

// Just pass the key as defined above

openssl_sign($data, $binary_signature, $private_key, OPENSSL_ALGO_SHA1);



// Check signature

$ok = openssl_verify($data, $binary_signature, $public_key, OPENSSL_ALGO_SHA1);

echo "check #1: ";

if ($ok == 1) {

    echo "signature ok (as it should be)\n";

} elseif ($ok == 0) {

    echo "bad (there's something wrong)\n";

} else {

    echo "ugly, error checking signature\n";

}



$ok = openssl_verify('tampered'.$data, $binary_signature, $public_key, OPENSSL_ALGO_SHA1);

echo "check #2: ";

if ($ok == 1) {

    echo "ERROR: Data has been tampered, but signature is still valid! Argh!\n";

} elseif ($ok == 0) {

    echo "bad signature (as it should be, since data has beent tampered)\n";

} else {

    echo "ugly, error checking signature\n";

}



?>

adam dot mansfeld at gmail dot com
19-Oct-2005 12:50


Hello,



the fourth parameter 'signature_alg' to choose the signature algorithm can be one of:



OPENSSL_ALGO_SHA1

OPENSSL_ALGO_MD5

OPENSSL_ALGO_MD4

OPENSSL_ALGO_MD2



Just for the case that somebody needs this.



Regards

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