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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] )

如果成功则返回 `TRUE`，失败则返回 `FALSE`。 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.

> 注意: 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.

例 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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