Instead of going through the whole dance with provider loading,
context creation etc, just call EVP_MD_CTX_reset() to reuse the
already-setup context, if any.
This makes QCryptographicHash::reset() adhere to its noexcept
specification again (assuming EVP_MD_CTX_reset() doesn't allocate
state, and, despite its non-void return type, cannot fail on a valid
context), and should greatly improve the speed of reset(), addData(),
resultView() cycles.
Pick-to: 6.5
Change-Id: I7c35b61cbeab1ffd6dd258e8389ea614d49e2e1e
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Jan Grulich <jgrulich@redhat.com>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
189444d8c4