Switch NIST PDFs from nvlpubs to csrc which is HTTPS (#3929)
diff --git a/docs/hazmat/primitives/key-derivation-functions.rst b/docs/hazmat/primitives/key-derivation-functions.rst
index ea5f3f8..0196e43 100644
--- a/docs/hazmat/primitives/key-derivation-functions.rst
+++ b/docs/hazmat/primitives/key-derivation-functions.rst
@@ -897,9 +897,9 @@
.. [#nist] See `NIST SP 800-132`_.
-.. _`NIST SP 800-132`: http://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-132.pdf
-.. _`NIST SP 800-108`: http://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-108.pdf
-.. _`NIST SP 800-56Ar2`: http://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-56Ar2.pdf
+.. _`NIST SP 800-132`: https://csrc.nist.gov/publications/detail/sp/800-132/final
+.. _`NIST SP 800-108`: https://csrc.nist.gov/publications/detail/sp/800-108/final
+.. _`NIST SP 800-56Ar2`: https://csrc.nist.gov/publications/detail/sp/800-56a/rev-2/final
.. _`ANSI X9.63:2001`: https://webstore.ansi.org
.. _`SEC 1 v2.0`: http://www.secg.org/sec1-v2.pdf
.. _`Password Storage Cheat Sheet`: https://www.owasp.org/index.php/Password_Storage_Cheat_Sheet