### Method

# Gio TlsConnection get_channel_binding_data

since: 2.66

#### Declaration

    gboolean
    g_tls_connection_get_channel_binding_data (
      GTlsConnection* conn,
      GTlsChannelBindingType type,
      GByteArray* data,
      GError** error
    )

#### Description

Query the TLS backend for TLS channel binding data of `type` for `conn`.

This call retrieves TLS channel binding data as specified in RFC 5056, RFC 5929, and related RFCs. The binding data is returned in `data`. The `data` is resized by the callee using `GByteArray` buffer management and will be freed when the `data` is destroyed by g_byte_array_unref(). If `data` is `NULL`, it will only check whether TLS backend is able to fetch the data (e.g. whether `type` is supported by the TLS backend). It does not guarantee that the data will be available though. That could happen if TLS connection does not support `type` or the binding data is not available yet due to additional negotiation or input required.

Available since: 2.66

#### Parameters

`type`

  Type: `GTlsChannelBindingType`

  `GTlsChannelBindingType` type of data to fetch.

`data`

  Type: An array of `guint8`

  `GByteArray` is filled with the binding data, or `NULL`.

  The argument will be set by the function.
  The argument can be `NULL`.
  The data is owned by the instance.

`error`

  Type: `GError **`

  The return location for a recoverable error.

  The argument can be `NULL`.
  If the return location is not `NULL`, then you must initialize it to a `NULL` `GError*`.
  The argument will be left initialized to `NULL` by the method if there are no errors.
  In case of error, the argument will be set to a newly allocated `GError`; the caller will take ownership of the data, and be responsible for freeing it.

#### Return value

Type: `gboolean`

`TRUE` on success, `FALSE` otherwise.