[image] Add the "imgdecrypt" command

Add the "imgdecrypt" command that can be used to decrypt a detached
encrypted data image using a cipher key obtained from a separate CMS
envelope image.  For example:

  # Create non-detached encrypted CMS messages
  #
  openssl cms -encrypt -binary -aes-256-gcm -recip client.crt \
              -in vmlinuz -outform DER -out vmlinuz.cms
  openssl cms -encrypt -binary -aes-256-gcm -recip client.crt \
              -in initrd.img -outform DER -out initrd.img.cms

  # Detach data from envelopes (using iPXE's contrib/crypto/cmsdetach)
  #
  cmsdetach vmlinuz.cms -d vmlinuz.dat -e vmlinuz.env
  cmsdetach initrd.img.cms -d initrd.img.dat -e initrd.img.env

and then within iPXE:

  #!ipxe
  imgfetch http://192.168.0.1/vmlinuz.dat
  imgfetch http://192.168.0.1/initrd.img.dat
  imgdecrypt vmlinuz.dat    http://192.168.0.1/vmlinuz.env
  imgdecrypt initrd.img.dat http://192.168.0.1/initrd.img.env
  boot vmlinuz

Signed-off-by: Michael Brown <mcb30@ipxe.org>

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