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# openssl_sign

(PHP 4 >= 4.0.4, PHP 5)

openssl_sign -- Generate signature

## Description

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

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
`<?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().

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