### Function

# Gcr trust_add_pinned_certificate

since: 3

#### Declaration [src]

    gboolean
    gcr_trust_add_pinned_certificate (
      GcrCertificate* certificate,
      const gchar* purpose,
      const gchar* peer,
      GCancellable* cancellable,
      GError** error
    )

#### Description [src]

Add a pinned `certificate` for connections to `peer` for `purpose`. A pinned certificate overrides all other certificate verification and should be used with care.

If the same pinned certificate already exists, then this operation does not add another, and succeeds without error.

This call may block, see `gcr_trust_add_pinned_certificate_async()` for the non-blocking version.

Available since: 3

#### Parameters

`certificate`

  Type: `GcrCertificate`

  A `GcrCertificate`.

  The data is owned by the caller of the function.

`purpose`

  Type: `const gchar*`

  The purpose string.

  The data is owned by the caller of the function.
  The value is a NUL terminated UTF-8 string.

`peer`

  Type: `const gchar*`

  The peer for this pinned certificate.

  The data is owned by the caller of the function.
  The value is a NUL terminated UTF-8 string.

`cancellable`

  Type: `GCancellable`

  A `GCancellable`.

  The argument can be `NULL`.
  The data is owned by the caller of the function.

`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 function 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` if the pinned certificate is recorded successfully.