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Add warnings to /dev/crypto for deprecated algorithms.

Description

Add warnings to /dev/crypto for deprecated algorithms.

These algorithms are deprecated algorithms that will have no in-kernel
consumers in FreeBSD 13. Specifically, deprecate the following
algorithms:

  • ARC4
  • Blowfish
  • CAST128
  • DES
  • 3DES
  • MD5-HMAC
  • Skipjack

MFC after: 1 month
Relnotes: yes
Sponsored by: Chelsio Communications
Differential Revision: https://reviews.freebsd.org/D20554

Details