(PHP 4 >= 4.0.4, PHP 5, PHP 7)
Generate signature
bool openssl_sign ( string $data, string &$signature, mixed $priv_key_id [, mixed $signature_alg = OPENSSL_ALGO_SHA1 ] )
openssl_sign() computes a signature for the specified data
by generating a cryptographic digital signature using the private key associated with priv_key_id
. Note that the data itself is not encrypted.
Parameters:
data
The string of data you wish to sign
signature
If the call was successful the signature is returned in signature
.
priv_key_id
resource - a key, returned by openssl_get_privatekey()
string - a PEM formatted key
signature_alg
int - one of these Signature Algorithms.
string - a valid string returned by openssl_get_md_methods() example, "sha256WithRSAEncryption" or "sha384".
Returns:
Returns TRUE
on success or FALSE
on failure.
Examples:
openssl_sign() example
<?php // $data is assumed to contain the data to be signed // fetch private key from file and ready it $pkeyid = openssl_pkey_get_private("file://src/openssl-0.9.6/demos/sign/key.pem"); // compute signature openssl_sign($data, $signature, $pkeyid); // free the key from memory openssl_free_key($pkeyid); ?>
openssl_sign() example
<?php //data you want to sign $data = 'my data'; //create new private and public key $new_key_pair = openssl_pkey_new(array( "private_key_bits" => 2048, "private_key_type" => OPENSSL_KEYTYPE_RSA, )); openssl_pkey_export($new_key_pair, $private_key_pem); $details = openssl_pkey_get_details($new_key_pair); $public_key_pem = $details['key']; //create signature openssl_sign($data, $signature, $private_key_pem, OPENSSL_ALGO_SHA256); //save for later file_put_contents('private_key.pem', $private_key_pem); file_put_contents('public_key.pem', $public_key_pem); file_put_contents('signature.dat', $signature); //verify signature $r = openssl_verify($data, $signature, $public_key_pem, "sha256WithRSAEncryption"); var_dump($r); ?>
See also:
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