### Function

# Gcr Pkcs11Certificate lookup_issuer

#### Declaration [src]

    GcrCertificate*
    gcr_pkcs11_certificate_lookup_issuer (
      GcrCertificate* certificate,
      GCancellable* cancellable,
      GError** error
    )

#### Description [src]

Lookup a the issuer of a `certificate` in the PKCS#11 storage. The lookup is done using the issuer DN of the certificate. No certificate chain verification is done. Use a crypto library to make trust decisions.

This call may block, see `gcr_pkcs11_certificate_lookup_issuer()` for the non-blocking version.

Will return `NULL` if no issuer certificate is found. Use `error` to determine if an error occurred.

#### Parameters

`certificate`

  Type: `GcrCertificate`

  A `GcrCertificate`.

  The data is owned by the caller of the function.

`cancellable`

  Type: `GCancellable`

  A cancellable.

  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: `GcrCertificate`

A new `GcrPkcs11Certificate`, or `NULL`.

The caller of the function takes ownership of the data, and is responsible for freeing it.
The return value can be `NULL`.