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-rwxr-xr-xscripts/check-blacklist-hashes.awk37
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diff --git a/scripts/check-blacklist-hashes.awk b/scripts/check-blacklist-hashes.awk
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+#!/usr/bin/awk -f
+# SPDX-License-Identifier: GPL-2.0
+#
+# Copyright © 2020, Microsoft Corporation. All rights reserved.
+#
+# Author: Mickaël Salaün <mic@linux.microsoft.com>
+#
+# Check that a CONFIG_SYSTEM_BLACKLIST_HASH_LIST file contains a valid array of
+# hash strings. Such string must start with a prefix ("tbs" or "bin"), then a
+# colon (":"), and finally an even number of hexadecimal lowercase characters
+# (up to 128).
+
+BEGIN {
+ RS = ","
+}
+{
+ if (!match($0, "^[ \t\n\r]*\"([^\"]*)\"[ \t\n\r]*$", part1)) {
+ print "Not a string (item " NR "):", $0;
+ exit 1;
+ }
+ if (!match(part1[1], "^(tbs|bin):(.*)$", part2)) {
+ print "Unknown prefix (item " NR "):", part1[1];
+ exit 1;
+ }
+ if (!match(part2[2], "^([0-9a-f]+)$", part3)) {
+ print "Not a lowercase hexadecimal string (item " NR "):", part2[2];
+ exit 1;
+ }
+ if (length(part3[1]) > 128) {
+ print "Hash string too long (item " NR "):", part3[1];
+ exit 1;
+ }
+ if (length(part3[1]) % 2 == 1) {
+ print "Not an even number of hexadecimal characters (item " NR "):", part3[1];
+ exit 1;
+ }
+}