ZTS: Replace MD5 and SHA256 wit XXH128

For data integrity checks as done in ZTS, the verification for
unintended data corruption with xxhash128 should be a lot faster
and perfectly usable.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tino Reichardt <milky-zfs@mcmilk.de>
Closes #16577

tests/zfs-tests/include/commands.cfg

@@ -99,7 +99,8 @@ export SYSTEM_FILES_COMMON='awk
     uniq
     vmstat
     wc
-    xargs'
+    xargs
+    xxh128sum'
 
 export SYSTEM_FILES_FREEBSD='chflags
     compress
@@ -111,13 +112,11 @@ export SYSTEM_FILES_FREEBSD='chflags
     jexec
     jls
     lsextattr
-    md5
     mdconfig
     newfs
     pw
     rmextattr
     setextattr
-    sha256
     showmount
     swapctl
     sysctl
@@ -145,7 +144,6 @@ export SYSTEM_FILES_LINUX='attr
     lscpu
     lsmod
     lsscsi
-    md5sum
     mkswap
     modprobe
     mountpoint
@@ -155,7 +153,6 @@ export SYSTEM_FILES_LINUX='attr
     perf
     setfattr
     setpriv
-    sha256sum
     udevadm
     unshare
     useradd

tests/zfs-tests/include/libtest.shlib

@@ -3455,21 +3455,24 @@ function tunable_exists
 }
 
 #
-# Compute MD5 digest for given file or stdin if no file given.
+# Compute xxh128sum for given file or stdin if no file given.
 # Note: file path must not contain spaces
 #
-function md5digest
+function xxh128digest
 {
-	openssl md5 -r $1 | awk '{print $1}'
+	xxh128sum $1 | awk '{print $1}'
 }
 
 #
-# Compute SHA256 digest for given file or stdin if no file given.
-# Note: file path must not contain spaces
+# Compare the xxhash128 digest of two files.
 #
-function sha256digest
-{
-	openssl sha256 -r $1 | awk '{print $1}'
+function cmp_xxh128 {
+	typeset file1=$1
+	typeset file2=$2
+
+	typeset sum1=$(xxh128digest $file1)
+	typeset sum2=$(xxh128digest $file2)
+	test "$sum1" = "$sum2"
 }
 
 function new_fs #<args>