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# openssl_sign

(PHP 4 >= 4.0.4)

openssl_sign -- Generate signature

## Description

``bool openssl_sign` (string data, string signature, mixed priv_key_id)`

Warning
This function is EXPERIMENTAL. The behaviour of this function, the name of this function, and anything else documented about this function may change in a future release of PHP without notice. Be warned and 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
    // $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().

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