OpenBSD FDE Setup
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This is a condensed version of OpenBSD FDE encryption FAQ.

Boot installer, drop to shell with "s"

  # cd /dev && sh MAKEDEV sd0
  # dd if=/dev/urandom of=/dev/rsd0c bs=1m
  # fdisk -iy -g -b 960 sd0 # GPT / without -g and -b for MBR
  # disklabel -E sd0

Note, switch to kbd en before setting the password as this is
what you have on the boot prompt.

  # bioctl -c C -l sd0a softraid0
  # dd if=/dev/zero of=/dev/rsd1c bs=1m count=1

Ctrl+D to restart the installer. Choose sd1 as install target.

If sd1 is not present:

    # cd /dev && sh MAKEDEV sd1

When the installer later asks about installing with MBR or GPT layout, 
choose MBR. Even if you boot via UEFI/GPT.

# Changelog:
# * 2020-11-14: Created
# * 2021-04-18: Added MBR info for disk layout selection