use a stronger hashing algorithm

Nobody wants to use md5 these days...
Signed-off-by: Christian Hesse <mail@eworm.de>

archiso/initcpio/hooks/archiso

@@ -99,7 +99,7 @@ _mnt_dev() {
 _verify_checksum() {
     local _status
     cd "/run/archiso/bootmnt/${archisobasedir}/${arch}"
-    md5sum -c airootfs.md5 > /tmp/checksum.log 2>&1
+    sha512sum -c airootfs.sha512 > /tmp/checksum.log 2>&1
     _status=$?
     cd "${OLDPWD}"
     return ${_status}
@@ -153,7 +153,7 @@ archiso_mount_handler() {
     fi
 
     if [[ "${checksum}" == "y" ]]; then
-        if [[ -f "/run/archiso/bootmnt/${archisobasedir}/${arch}/airootfs.md5" ]]; then
+        if [[ -f "/run/archiso/bootmnt/${archisobasedir}/${arch}/airootfs.sha512" ]]; then
             msg -n ":: Self-test requested, please wait..."
             if _verify_checksum; then
                 msg "done. Checksum is OK, continue booting."
@@ -163,7 +163,7 @@ archiso_mount_handler() {
                 launch_interactive_shell
             fi
         else
-            echo "ERROR: checksum=y option specified but ${archisobasedir}/${arch}/airootfs.md5 not found"
+            echo "ERROR: checksum=y option specified but ${archisobasedir}/${arch}/airootfs.sha512 not found"
             launch_interactive_shell
         fi
     fi

archiso/initcpio/hooks/archiso_pxe_http

@@ -41,7 +41,7 @@ archiso_pxe_http_mount_handler () {
     _curl_get "${archiso_http_srv}${archisobasedir}/${arch}/airootfs.sfs" "/${arch}"
 
     if [[ "${checksum}" == "y" ]]; then
-        _curl_get "${archiso_http_srv}${archisobasedir}/${arch}/airootfs.md5" "/${arch}"
+        _curl_get "${archiso_http_srv}${archisobasedir}/${arch}/airootfs.sha512" "/${arch}"
     fi
     if [[ "${verify}" == "y" ]]; then
         _curl_get "${archiso_http_srv}${archisobasedir}/${arch}/airootfs.sfs.sig" "/${arch}"

archiso/mkarchiso

@@ -249,7 +249,7 @@ _mkairootfs_sfs () {
 _mkchecksum () {
     _msg_info "Creating checksum file for self-test..."
     cd "${work_dir}/iso/${install_dir}/${arch}"
-    md5sum airootfs.sfs > airootfs.md5
+    sha512sum airootfs.sfs > airootfs.sha512
     cd ${OLDPWD}
     _msg_info "Done!"
 }