myzip/myunzip: Add an option for SHA256 sum

myzip: Add an option (-s) to create a .sha256sum file.
myunzip: Check the SHA256 sum if a .sha256sum file exists.

Update the email address.
Signed-off-by: Cédric Marie <cedric@hjuvi.fr.eu.org>

README

 Painted Shell: A collection of colorful settings and scripts for Bash shell.
 
-Written in 2013-2019 by Cédric Marie <cedric@hjuvi.lautre.net>
+Written in 2013-2019 by Cédric Marie <cedric@hjuvi.fr.eu.org>
 
 To the extent possible under law, the author(s) have dedicated all copyright
 and related and neighboring rights to this software to the public domain

scripts/myunzip

@@ -3,7 +3,7 @@
 # myunzip - Uncompress a .tar.xz[.enc] file
 # This file is part of Painted Shell - Shell configuration and scripts.
 #
-# Written in 2013-2018 by Cédric Marie
+# Written in 2013-2019 by Cédric Marie
 #
 # To the extent possible under law, the author(s) have dedicated all copyright
 # and related and neighboring rights to this software to the public domain
@@ -35,6 +35,9 @@ shift $(($OPTIND - 1))
 option_crypt=0
 
 if [ "$1" = "" -o ! -f "$1" ]; then print_usage; exit 1; fi
+if [ -f "${1}.sha256sum" ]; then
+    sha256sum -c ${1}.sha256sum || exit 1;
+fi
 file=${1%.enc}
 if [ "$file" != "$1" ]; then
     option_crypt=1

scripts/myzip

@@ -3,7 +3,7 @@
 # myzip - Compress a directory to .tar.xz[.enc] file
 # This file is part of Painted Shell - Shell configuration and scripts.
 #
-# Written in 2013-2018 by Cédric Marie
+# Written in 2013-2019 by Cédric Marie
 #
 # To the extent possible under law, the author(s) have dedicated all copyright
 # and related and neighboring rights to this software to the public domain
@@ -22,17 +22,20 @@ print_usage()
     printf "  -h  display this message\n"
     printf "  -t  timestamp output file\n"
     printf "  -e  encrypt output file with password\n"
+    printf "  -s  create a .sha256sum file\n"
 }
 
 option_timestamp=0
 option_encrypt=0
+option_sha256sum=0
 # Get options from command line
-while getopts hte OPT
+while getopts htes OPT
 do
     case $OPT in
         h) print_usage; exit 0;;
         t) option_timestamp=1;;
         e) option_encrypt=1;;
+        s) option_sha256sum=1;;
         *) print_usage; exit 1;;
     esac
 done
@@ -60,3 +63,7 @@ if [ $option_encrypt -eq 1 ]; then
 fi
 chmod 444 $output_file
 printf "\033[1mOutput file:\033[0m $output_file\n"
+if [ $option_sha256sum -eq 1 ]; then
+    sha256sum $output_file > $output_file.sha256sum
+    printf "           + $output_file.sha256sum\n"
+fi