This function will set a callback function to be used when it is
required to access a protected object. This function overrides the
global function set using gnutls_pkcs11_set_pin_function().
Note that this callback is currently used only during the import of a
PKCS 11 certificate with gnutls_x509_crt_import_url().
This page is part of the GnuTLS (GnuTLS Transport Layer Security
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