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# stream_socket_enable_crypto

(PHP 5 >= 5.1.0RC1)

stream_socket_enable_crypto -- Turns encryption on/off on an already connected socket

## Description

mixed stream_socket_enable_crypto ( resource stream, bool enable [, int crypto_type [, resource session_stream]] )

When called with the crypto_type parameter, stream_socket_enable_crypto() will setup encryption on the stream using the specified method.

Valid values for crypto_type

- `STREAM_CRYPTO_METHOD_SSLv2_CLIENT`

- `STREAM_CRYPTO_METHOD_SSLv3_CLIENT`

- `STREAM_CRYPTO_METHOD_SSLv23_CLIENT`

- `STREAM_CRYPTO_METHOD_TLS_CLIENT`

- `STREAM_CRYPTO_METHOD_SSLv2_SERVER`

- `STREAM_CRYPTO_METHOD_SSLv3_SERVER`

- `STREAM_CRYPTO_METHOD_SSLv23_SERVER`

- `STREAM_CRYPTO_METHOD_TLS_SERVER`

Once the crypto settings are established, cryptography can be turned on and off dynamically by passing `TRUE` or `FALSE` in the enable parameter.

If this stream should be seeded with settings from an already established crypto enabled stream, pass that stream's resource variable in the fourth parameter.

Returns `TRUE` on success, `FALSE` if negotiation has failed or 0 if there isn't enough data and you should try again (only for non-blocking sockets).

Esempio 1. stream_socket_enable_crypto() Example

`<?php
$fp = stream_socket_client("tcp://myproto.example.com:31337", $errno, $errstr, 30);
if (!$fp) {
die("Unable to connect: $errstr ($errno)");
}
/* Turn on encryption for login phase */
stream_socket_enable_crypto($fp, true, STREAM_CRYPTO_METHOD_SSLv23_CLIENT);
fwrite($fp, "USER god\r\n");
fwrite($fp, "PASS secret\r\n");
/* Turn off encryption for the rest */
stream_socket_enable_crypto($fp, false);
while ($motd = fgets($fp)) {
echo $motd;
}
fclose($fp);
?>`

Riferimento C, OpenSSL Functions, and Appendice O

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