OpenZFS 4185 - add new cryptographic checksums to ZFS: SHA-512, Skein, Edon-R

Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Prakash Surya <prakash.surya@delphix.com>
Reviewed by: Saso Kiselkov <saso.kiselkov@nexenta.com>
Reviewed by: Richard Lowe <richlowe@richlowe.net>
Approved by: Garrett D'Amore <garrett@damore.org>
Ported by: Tony Hutter <hutter2@llnl.gov>

OpenZFS-issue: https://www.illumos.org/issues/4185
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/45818ee

Porting Notes:
This code is ported on top of the Illumos Crypto Framework code:

    https://github.com/zfsonlinux/zfs/pull/4329/commits/b5e030c8dbb9cd393d313571dee4756fbba8c22d

The list of porting changes includes:

- Copied module/icp/include/sha2/sha2.h directly from illumos

- Removed from module/icp/algs/sha2/sha2.c:
	#pragma inline(SHA256Init, SHA384Init, SHA512Init)

- Added 'ctx' to lib/libzfs/libzfs_sendrecv.c:zio_checksum_SHA256() since
  it now takes in an extra parameter.

- Added CTASSERT() to assert.h from for module/zfs/edonr_zfs.c

- Added skein & edonr to libicp/Makefile.am

- Added sha512.S.  It was generated from sha512-x86_64.pl in Illumos.

- Updated ztest.c with new fletcher_4_*() args; used NULL for new CTX argument.

- In icp/algs/edonr/edonr_byteorder.h, Removed the #if defined(__linux) section
  to not #include the non-existant endian.h.

- In skein_test.c, renane NULL to 0 in "no test vector" array entries to get
  around a compiler warning.

- Fixup test files:
	- Rename <sys/varargs.h> -> <varargs.h>, <strings.h> -> <string.h>,
	- Remove <note.h> and define NOTE() as NOP.
	- Define u_longlong_t
	- Rename "#!/usr/bin/ksh" -> "#!/bin/ksh -p"
	- Rename NULL to 0 in "no test vector" array entries to get around a
	  compiler warning.
	- Remove "for isa in $($ISAINFO); do" stuff
	- Add/update Makefiles
	- Add some userspace headers like stdio.h/stdlib.h in places of
	  sys/types.h.

- EXPORT_SYMBOL *_Init/*_Update/*_Final... routines in ICP modules.

- Update scripts/zfs2zol-patch.sed

- include <sys/sha2.h> in sha2_impl.h

- Add sha2.h to include/sys/Makefile.am

- Add skein and edonr dirs to icp Makefile

- Add new checksums to zpool_get.cfg

- Move checksum switch block from zfs_secpolicy_setprop() to
  zfs_check_settable()

- Fix -Wuninitialized error in edonr_byteorder.h on PPC

- Fix stack frame size errors on ARM32
  	- Don't unroll loops in Skein on 32-bit to save stack space
  	- Add memory barriers in sha2.c on 32-bit to save stack space

- Add filetest_001_pos.ksh checksum sanity test

- Add option to write psudorandom data in file_write utility

module/zcommon/zfs_fletcher.c

@@ -23,6 +23,9 @@
  * Use is subject to license terms.
  * Copyright (C) 2016 Gvozden Nešković. All rights reserved.
  */
+/*
+ * Copyright 2013 Saso Kiselkov. All rights reserved.
+ */
 
 /*
  * Fletcher Checksums
@@ -206,8 +209,10 @@ static struct fletcher_4_kstat {
 /* Indicate that benchmark has been completed */
 static boolean_t fletcher_4_initialized = B_FALSE;
 
+/*ARGSUSED*/
 void
-fletcher_2_native(const void *buf, uint64_t size, zio_cksum_t *zcp)
+fletcher_2_native(const void *buf, uint64_t size,
+    const void *ctx_template, zio_cksum_t *zcp)
 {
 	const uint64_t *ip = buf;
 	const uint64_t *ipend = ip + (size / sizeof (uint64_t));
@@ -223,8 +228,10 @@ fletcher_2_native(const void *buf, uint64_t size, zio_cksum_t *zcp)
 	ZIO_SET_CHECKSUM(zcp, a0, a1, b0, b1);
 }
 
+/*ARGSUSED*/
 void
-fletcher_2_byteswap(const void *buf, uint64_t size, zio_cksum_t *zcp)
+fletcher_2_byteswap(const void *buf, uint64_t size,
+    const void *ctx_template, zio_cksum_t *zcp)
 {
 	const uint64_t *ip = buf;
 	const uint64_t *ipend = ip + (size / sizeof (uint64_t));
@@ -404,8 +411,10 @@ fletcher_4_native_impl(const fletcher_4_ops_t *ops, const void *buf,
 		ops->fini_native(zcp);
 }
 
+/*ARGSUSED*/
 void
-fletcher_4_native(const void *buf, uint64_t size, zio_cksum_t *zcp)
+fletcher_4_native(const void *buf, uint64_t size,
+    const void *ctx_template, zio_cksum_t *zcp)
 {
 	const fletcher_4_ops_t *ops;
 	uint64_t p2size = P2ALIGN(size, 64);
@@ -443,8 +452,10 @@ fletcher_4_byteswap_impl(const fletcher_4_ops_t *ops, const void *buf,
 		ops->fini_byteswap(zcp);
 }
 
+/*ARGSUSED*/
 void
-fletcher_4_byteswap(const void *buf, uint64_t size, zio_cksum_t *zcp)
+fletcher_4_byteswap(const void *buf, uint64_t size,
+    const void *ctx_template, zio_cksum_t *zcp)
 {
 	const fletcher_4_ops_t *ops;
 	uint64_t p2size = P2ALIGN(size, 64);
@@ -551,7 +562,7 @@ fletcher_4_benchmark_impl(boolean_t native, char *data, uint64_t data_size)
 		start = gethrtime();
 		do {
 			for (l = 0; l < 32; l++, run_count++)
-				fletcher_4_test(data, data_size, &zc);
+				fletcher_4_test(data, data_size, NULL, &zc);
 
 			run_time_ns = gethrtime() - start;
 		} while (run_time_ns < FLETCHER_4_BENCH_NS);

module/zcommon/zfs_prop.c

@@ -70,6 +70,10 @@ zfs_prop_init(void)
 		{ "fletcher2",	ZIO_CHECKSUM_FLETCHER_2 },
 		{ "fletcher4",	ZIO_CHECKSUM_FLETCHER_4 },
 		{ "sha256",	ZIO_CHECKSUM_SHA256 },
+		{ "noparity",   ZIO_CHECKSUM_NOPARITY },
+		{ "sha512",	ZIO_CHECKSUM_SHA512 },
+		{ "skein",	ZIO_CHECKSUM_SKEIN },
+		{ "edonr",	ZIO_CHECKSUM_EDONR },
 		{ NULL }
 	};
 
@@ -80,6 +84,14 @@ zfs_prop_init(void)
 		{ "sha256",	ZIO_CHECKSUM_SHA256 },
 		{ "sha256,verify",
 				ZIO_CHECKSUM_SHA256 | ZIO_CHECKSUM_VERIFY },
+		{ "sha512",	ZIO_CHECKSUM_SHA512 },
+		{ "sha512,verify",
+				ZIO_CHECKSUM_SHA512 | ZIO_CHECKSUM_VERIFY },
+		{ "skein",	ZIO_CHECKSUM_SKEIN },
+		{ "skein,verify",
+				ZIO_CHECKSUM_SKEIN | ZIO_CHECKSUM_VERIFY },
+		{ "edonr,verify",
+				ZIO_CHECKSUM_EDONR | ZIO_CHECKSUM_VERIFY },
 		{ NULL }
 	};
 
@@ -241,12 +253,12 @@ zfs_prop_init(void)
 	zprop_register_index(ZFS_PROP_CHECKSUM, "checksum",
 	    ZIO_CHECKSUM_DEFAULT, PROP_INHERIT, ZFS_TYPE_FILESYSTEM |
 	    ZFS_TYPE_VOLUME,
-	    "on | off | fletcher2 | fletcher4 | sha256", "CHECKSUM",
-	    checksum_table);
+	    "on | off | fletcher2 | fletcher4 | sha256 | sha512 | "
+	    "skein | edonr", "CHECKSUM", checksum_table);
 	zprop_register_index(ZFS_PROP_DEDUP, "dedup", ZIO_CHECKSUM_OFF,
 	    PROP_INHERIT, ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME,
-	    "on | off | verify | sha256[,verify]", "DEDUP",
-	    dedup_table);
+	    "on | off | verify | sha256[,verify], sha512[,verify], "
+	    "skein[,verify], edonr,verify", "DEDUP", dedup_table);
 	zprop_register_index(ZFS_PROP_COMPRESSION, "compression",
 	    ZIO_COMPRESS_DEFAULT, PROP_INHERIT,
 	    ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME,