--- a/lib/Makefile
+++ b/lib/Makefile
@@ -271,7 +271,7 @@
 	$(call cmd,build_OID_registry)
 
 quiet_cmd_build_OID_registry = GEN     $@
-      cmd_build_OID_registry = perl $(srctree)/$(src)/build_OID_registry $< $@
+      cmd_build_OID_registry = $(CONFIG_SHELL) $(srctree)/$(src)/build_OID_registry <$< >$@
 
 clean-files	+= oid_registry_data.c
 
--- a/lib/build_OID_registry
+++ b/lib/build_OID_registry
@@ -1,4 +1,4 @@
-#!/usr/bin/perl -w
+#!/bin/sh
 # SPDX-License-Identifier: GPL-2.0-or-later
 #
 # Build a static ASN.1 Object Identified (OID) registry
@@ -7,197 +7,93 @@
 # Written by David Howells (dhowells@redhat.com)
 #
 
-use strict;
-
-my @names = ();
-my @oids = ();
-
-if ($#ARGV != 1) {
-    print STDERR "Format: ", $0, " <in-h-file> <out-c-file>\n";
-    exit(2);
-}
-
 #
-# Open the file to read from
+# Read OID lines and determine the lengths of the encoded data arrays.
 #
-open IN_FILE, "<$ARGV[0]" || die;
-while (<IN_FILE>) {
-    chomp;
-    if (m!\s+OID_([a-zA-z][a-zA-Z0-9_]+),\s+/[*]\s+([012][.0-9]*)\s+[*]/!) {
-	push @names, $1;
-	push @oids, $2;
-    }
-}
-close IN_FILE || die;
+set -f -- # use "$@" array for data
+total_length=0 IFS='.'
+while IFS=' 	' read -r line; do
+	if [ "${line#OID_[a-z]}" != "$line" ]; then
+		name="${line#*_}" name="${name%,*}" oid="${line#*/* }" oid="${oid% */}"
+		# shellcheck disable=SC2086
+		size="$(set -- $oid; printf '%u' "$(($# - 1))")"
+		for c in $oid; do
+			# We will base128 encode the number
+			: "$((size += c ? $(awk "BEGIN{print int(log($c)/log(2)/7)}") : 0))"
+		done
+		set -- "$@" "$name:$oid:$total_length"
+		: "$((total_length += size))"
+	fi
+done
 
 #
-# Open the files to write into
-#
-open C_FILE, ">$ARGV[1]" or die;
-print C_FILE "/*\n";
-print C_FILE " * Automatically generated by ", $0, ".  Do not edit\n";
-print C_FILE " */\n";
-
-#
-# Split the data up into separate lists and also determine the lengths of the
-# encoded data arrays.
-#
-my @indices = ();
-my @lengths = ();
-my $total_length = 0;
-
-for (my $i = 0; $i <= $#names; $i++) {
-    my $name = $names[$i];
-    my $oid = $oids[$i];
-
-    my @components = split(/[.]/, $oid);
-
-    # Determine the encoded length of this OID
-    my $size = $#components;
-    for (my $loop = 2; $loop <= $#components; $loop++) {
-	my $c = $components[$loop];
-
-	# We will base128 encode the number
-	my $tmp = ($c == 0) ? 0 : int(log($c)/log(2));
-	$tmp = int($tmp / 7);
-	$size += $tmp;
-    }
-    push @lengths, $size;
-    push @indices, $total_length;
-    $total_length += $size;
-}
-
-#
 # Emit the look-up-by-OID index table
 #
-print C_FILE "\n";
-if ($total_length <= 255) {
-    print C_FILE "static const unsigned char oid_index[OID__NR + 1] = {\n";
-} else {
-    print C_FILE "static const unsigned short oid_index[OID__NR + 1] = {\n";
-}
-for (my $i = 0; $i <= $#names; $i++) {
-    print C_FILE "\t[OID_", $names[$i], "] = ", $indices[$i], ",\n"
-}
-print C_FILE "\t[OID__NR] = ", $total_length, "\n";
-print C_FILE "};\n";
+printf '/*\n * Automatically generated by %s. Do not edit\n */\n\n' "$0"
+if [ "$total_length" -le 255 ]; then
+	printf 'static const unsigned char oid_index[OID__NR + 1] = {\n'
+else
+	printf 'static const unsigned short oid_index[OID__NR + 1] = {\n'
+fi
+for i do
+	printf '\t[OID_%s] = %u,\n' "${i%%:*}" "${i##*:}"
+done
+printf '\t[OID__NR] = %u\n};\n\n' "$total_length"
 
 #
-# Encode the OIDs
+# Encode the OIDs and emit the OID data
 #
-my @encoded_oids = ();
+printf 'static const unsigned char oid_data[%u] = {\n' "$total_length"
+for i do
+	IFS='.' j=0 i="${i%:*}"
+	for c in ${i##*:}; do
+		case "$((j += 1))" in
+			1) o="$((c * 40))";;
+			2) : "$((o += c))";;
+			*)
+				# Base128 encode the number
+				tmp="$((c ? $(awk "BEGIN{print int(log($c)/log(2)/7)+1}") : 1))"
+				while [ "$((tmp -= 1))" -gt 0 ]; do
+					o="$o.$((c >> tmp * 7 & 127 | 128))"
+				done
+				o="$o.$((c & 127))"
+		esac
+	done
 
-for (my $i = 0; $i <= $#names; $i++) {
-    my @octets = ();
+	set -- "$@" "${i%:*}:$o"
+	shift
 
-    my @components = split(/[.]/, $oids[$i]);
+	printf '\t'
+	printf '%s, ' $o
+	printf '\t// %s\n' "${i%:*}"
+done
+printf '};\n\n'
 
-    push @octets, $components[0] * 40 + $components[1];
+printf 'static const struct {\n\tunsigned char hash;\n'
+printf '\tenum OID oid : %u;\n} oid_search_table[OID__NR] = {' \
+	"$(($# <= 255 ? 8 : 16))"
 
-    for (my $loop = 2; $loop <= $#components; $loop++) {
-	my $c = $components[$loop];
-
-	# Base128 encode the number
-	my $tmp = ($c == 0) ? 0 : int(log($c)/log(2));
-	$tmp = int($tmp / 7);
-
-	for (; $tmp > 0; $tmp--) {
-	    push @octets, (($c >> $tmp * 7) & 0x7f) | 0x80;
-	}
-	push @octets, $c & 0x7f;
-    }
-
-    push @encoded_oids, \@octets;
-}
-
 #
-# Create a hash value for each OID
+# Create a hash value for each OID and build and emit the search index and hash
+# value table (ordered by length then hash then content)
 #
-my @hash_values = ();
-for (my $i = 0; $i <= $#names; $i++) {
-    my @octets = @{$encoded_oids[$i]};
-
-    my $hash = $#octets;
-    foreach (@octets) {
-	$hash += $_ * 33;
-    }
-
-    $hash = ($hash >> 24) ^ ($hash >> 16) ^ ($hash >> 8) ^ ($hash);
-
-    push @hash_values, $hash & 0xff;
-}
-
-#
-# Emit the OID data
-#
-print C_FILE "\n";
-print C_FILE "static const unsigned char oid_data[", $total_length, "] = {\n";
-for (my $i = 0; $i <= $#names; $i++) {
-    my @octets = @{$encoded_oids[$i]};
-    print C_FILE "\t";
-    print C_FILE $_, ", " foreach (@octets);
-    print C_FILE "\t// ", $names[$i];
-    print C_FILE "\n";
-}
-print C_FILE "};\n";
-
-#
-# Build the search index table (ordered by length then hash then content)
-#
-my @index_table = ( 0 .. $#names );
-
-@index_table = sort {
-    my @octets_a = @{$encoded_oids[$a]};
-    my @octets_b = @{$encoded_oids[$b]};
-
-    return $hash_values[$a] <=> $hash_values[$b]
-	if ($hash_values[$a] != $hash_values[$b]);
-    return $#octets_a <=> $#octets_b
-	if ($#octets_a != $#octets_b);
-    for (my $i = $#octets_a; $i >= 0; $i--) {
-	return $octets_a[$i] <=> $octets_b[$i]
-	    if ($octets_a[$i] != $octets_b[$i]);
-    }
-    return 0;
-
-} @index_table;
-
-#
-# Emit the search index and hash value table
-#
-print C_FILE "\n";
-print C_FILE "static const struct {\n";
-print C_FILE "\tunsigned char hash;\n";
-if ($#names <= 255) {
-    print C_FILE "\tenum OID oid : 8;\n";
-} else {
-    print C_FILE "\tenum OID oid : 16;\n";
-}
-print C_FILE "} oid_search_table[OID__NR] = {\n";
-for (my $i = 0; $i <= $#names; $i++) {
-    my @octets = @{$encoded_oids[$index_table[$i]]};
-    printf(C_FILE "\t[%3u] = { %3u, OID_%-35s }, // ",
-	   $i,
-	   $hash_values[$index_table[$i]],
-	   $names[$index_table[$i]]);
-    printf C_FILE "%02x", $_ foreach (@octets);
-    print C_FILE "\n";
-}
-print C_FILE "};\n";
-
-#
-# Emit the OID debugging name table
-#
-#print C_FILE "\n";
-#print C_FILE "const char *const oid_name_table[OID__NR + 1] = {\n";
-#
-#for (my $i = 0; $i <= $#names; $i++) {
-#    print C_FILE "\t\"", $names[$i], "\",\n"
-#}
-#print C_FILE "\t\"Unknown-OID\"\n";
-#print C_FILE "};\n";
-
-#
-# Polish off
-#
-close C_FILE or die;
+i=-1
+for j do
+	IFS='.' 
+	# shellcheck disable=SC2086
+	count="$(set -- ${j##*:}; printf '%u' "$(($# - 1))")"
+	hash="$count"
+	set -- # use as array for reversing octet set
+	for k in ${j##*:}; do
+		: "$((hash += k * 33))"
+		set -- "$k" "$@"
+	done
+	hash="$((hash >> 24 ^ hash >> 16 ^ hash >> 8 ^ hash & 255))"
+	IFS=':'
+	printf '%u:%s:%s:%u:%s\n' "$hash" "${j##*:}" "${j%%:*}" "$count" "$*"
+done | sort -nt: -k1,1 -k4,4 -k5 | while IFS=':' read -r num octets name _; do
+	printf '\n\t[%3u] = { %3u, OID_%-35s }, // ' "$((i += 1))" "$num" "$name"
+	# shellcheck disable=SC2086
+	printf '%02x' $octets
+done
+printf '\n};\n'