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openssl_sign -- Generate signature


bool openssl_sign (string data, string signature, int priv_key_id)

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().