sys: Automated cleanup of cdefs and other formatting

Apply the following automated changes to try to eliminate
no-longer-needed sys/cdefs.h includes as well as now-empty
blank lines in a row.

Remove /^#if.*\n#endif.*\n#include\s+<sys/cdefs.h>.*\n/
Remove /\n+#include\s+<sys/cdefs.h>.*\n+#if.*\n#endif.*\n+/
Remove /\n+#if.*\n#endif.*\n+/
Remove /^#if.*\n#endif.*\n/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/types.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/param.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/capsicum.h>/

Sponsored by: Netflix

sys: Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

stand: Fix KASSERT use

Explicitly include sys/systm.h to pull in KASSERT.

Sponsored by: Netflix
Reviewed by: jhb
Differential Revision: https://reviews.freebsd.org/D33855

crypto: Re-add encrypt/decrypt_multi hooks to enc_xform.

These callbacks allow multiple contiguous blocks to be manipulated in
a single call. Note that any trailing partial block for a stream
cipher must still be passed to encrypt/decrypt_last.

While here, document the setkey and reinit hooks and reorder the hooks
in 'struct enc_xform' to better reflect the life cycle.

Reviewed by: markj
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D33529

stand: fix build after recent opencrypto changes

Pass the ivlen along through, and just drop this KASSERT() if we're
building _STANDALONE for the time being.

Fixes: 1833d6042c9a ("crypto: Permit variable-sized IVs ...")

crypto: Permit variable-sized IVs for ciphers with a reinit hook.

Add a 'len' argument to the reinit hook in 'struct enc_xform' to
permit support for AEAD ciphers such as AES-CCM and Chacha20-Poly1305
which support different nonce lengths.

Reviewed by: markj
Sponsored by: Chelsio Communications, The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D32105

crypto: Constify all transform descriptors

No functional change intended.

Reviewed by: ae, jhb
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D31196

Include sys/types.h here

It's included by header pollution in most of the compile
environments. However, in the standalone envirnment, it's not
included. Go ahead and include it always since the overhead is low and
it is simpler that way.

MFC After: 3 days

Various cleanups to the software encryption transform interface.

- Consistently use 'void *' for key schedules / key contexts instead
of a mix of 'caddr_t', 'uint8_t *', and 'void *'.

- Add a ctxsize member to enc_xform similar to what auth transforms use
and require callers to malloc/zfree the context. The setkey callback
now supplies the caller-allocated context pointer and the zerokey
callback is removed. Callers now always use zfree() to ensure
key contexts are zeroed.

- Consistently use C99 initializers for all statically-initialized
instances of 'struct enc_xform'.

- Change the encrypt and decrypt functions to accept separate in and
out buffer pointers. Almost all of the backend crypto functions
already supported separate input and output buffers and this makes
it simpler to support separate buffers in OCF.

- Remove xform_userland.h shim to permit transforms to be compiled in
userland. Transforms no longer call malloc/free directly.

Reviewed by: cem (earlier version)
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D24855

Use 'const' for keys and IVs passed to software encryption algorithms.

Specifically, use 'const' for the key passed to the 'setkey' method
and 'const' for the 'iv' passed to the 'reinit' method.

Reviewed by: cem
Sponsored by: Chelsio Communications
Differential Revision: https://reviews.freebsd.org/D21347

Break up opencrypto/xform.c so it can be reused piecemeal

Keep xform.c as a meta-file including the broken out bits
existing code that includes xform.c continues to work as normal

Individual algorithms can now be reused elsewhere, including outside
of the kernel

Reviewed by: bapt (previous version), gnn, delphij
Approved by: secteam
MFC after: 1 week
Sponsored by: ScaleEngine Inc.
Differential Revision: https://reviews.freebsd.org/D4674