Use coreutils binaries for checking/generating checksums

If pacman is build against a crypto library other than openssl, it makes no
sense to require makepkg to use it.

The only currently considered alternative to openssl is nettle, which has no
binary for base64 encode/decode. This means that we could replace the hashing
cacluations with nettle-hash, but would require base64 from coreutils.

Given makepkg already relies heavily on coreutils, we might as well use all
the coreutils hashing binaries too.

This patch also improves the checking of required binaries for hashing
operations.

Signed-off-by: Allan McRae <allan@archlinux.org>

2 files changed, 4 insertions, 9 deletions

diff --git a/scripts/libmakepkg/integrity/generate_checksum.sh.in b/scripts/libmakepkg/integrity/generate_checksum.sh.in
index 7a567100..b61f2281 100644
--- a/scripts/libmakepkg/integrity/generate_checksum.sh.in
+++ b/scripts/libmakepkg/integrity/generate_checksum.sh.in
@@ -59,8 +59,8 @@ generate_one_checksum() {
 				if [[ $netfile != *.@(sig?(n)|asc) ]]; then
 					local file
 					file="$(get_filepath "$netfile")" || missing_source_file "$netfile"
-					sum="$(openssl dgst -${integ} "$file")"
-					sum=${sum##* }
+					sum="$("${integ}sum" "$file")"
+					sum=${sum%% *}
 				else
 					sum="SKIP"
 				fi
@@ -80,11 +80,6 @@ generate_one_checksum() {
 generate_checksums() {
 	msg "$(gettext "Generating checksums for source files...")"
 
-	if ! type -p openssl >/dev/null; then
-		error "$(gettext "Cannot find the %s binary required for generating sourcefile checksums.")" "openssl"
-		exit 1 # $E_MISSING_PROGRAM
-	fi
-
 	local integlist
 	if (( $# == 0 )); then
 		IFS=$'\n' read -rd '' -a integlist < <(get_integlist)
diff --git a/scripts/libmakepkg/integrity/verify_checksum.sh.in b/scripts/libmakepkg/integrity/verify_checksum.sh.in
index 44a2b2e1..5830aff3 100644
--- a/scripts/libmakepkg/integrity/verify_checksum.sh.in
+++ b/scripts/libmakepkg/integrity/verify_checksum.sh.in
@@ -82,8 +82,8 @@ verify_integrity_one() {
 		return 1
 	fi
 
-	local realsum="$(openssl dgst -${integ} "$file")"
-	realsum="${realsum##* }"
+	local realsum="$("${integ}sum" "$file")"
+	realsum="${realsum%% *}"
 	if [[ ${expectedsum,,} = "$realsum" ]]; then
 		printf '%s\n' "$(gettext "Passed")" >&2
 	else