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-rw-r--r--include/linux/oid_registry.h90
-rw-r--r--lib/.gitignore2
-rw-r--r--lib/Kconfig5
-rw-r--r--lib/Makefile16
-rwxr-xr-xlib/build_OID_registry209
-rw-r--r--lib/oid_registry.c89
6 files changed, 410 insertions, 1 deletions
diff --git a/include/linux/oid_registry.h b/include/linux/oid_registry.h
new file mode 100644
index 000000000000..5928546bf00a
--- /dev/null
+++ b/include/linux/oid_registry.h
@@ -0,0 +1,90 @@
1/* ASN.1 Object identifier (OID) registry
2 *
3 * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
10 */
11
12#ifndef _LINUX_OID_REGISTRY_H
13#define _LINUX_OID_REGISTRY_H
14
15#include <linux/types.h>
16
17/*
18 * OIDs are turned into these values if possible, or OID__NR if not held here.
19 *
20 * NOTE! Do not mess with the format of each line as this is read by
21 * build_OID_registry.pl to generate the data for look_up_OID().
22 */
23enum OID {
24 OID_id_dsa_with_sha1, /* 1.2.840.10030.4.3 */
25 OID_id_dsa, /* 1.2.840.10040.4.1 */
26 OID_id_ecdsa_with_sha1, /* 1.2.840.10045.4.1 */
27 OID_id_ecPublicKey, /* 1.2.840.10045.2.1 */
28
29 /* PKCS#1 {iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs-1(1)} */
30 OID_rsaEncryption, /* 1.2.840.113549.1.1.1 */
31 OID_md2WithRSAEncryption, /* 1.2.840.113549.1.1.2 */
32 OID_md3WithRSAEncryption, /* 1.2.840.113549.1.1.3 */
33 OID_md4WithRSAEncryption, /* 1.2.840.113549.1.1.4 */
34 OID_sha1WithRSAEncryption, /* 1.2.840.113549.1.1.5 */
35 OID_sha256WithRSAEncryption, /* 1.2.840.113549.1.1.11 */
36 OID_sha384WithRSAEncryption, /* 1.2.840.113549.1.1.12 */
37 OID_sha512WithRSAEncryption, /* 1.2.840.113549.1.1.13 */
38 OID_sha224WithRSAEncryption, /* 1.2.840.113549.1.1.14 */
39 /* PKCS#7 {iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs-7(7)} */
40 OID_data, /* 1.2.840.113549.1.7.1 */
41 OID_signed_data, /* 1.2.840.113549.1.7.2 */
42 /* PKCS#9 {iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs-9(9)} */
43 OID_email_address, /* 1.2.840.113549.1.9.1 */
44 OID_content_type, /* 1.2.840.113549.1.9.3 */
45 OID_messageDigest, /* 1.2.840.113549.1.9.4 */
46 OID_signingTime, /* 1.2.840.113549.1.9.5 */
47 OID_smimeCapabilites, /* 1.2.840.113549.1.9.15 */
48 OID_smimeAuthenticatedAttrs, /* 1.2.840.113549.1.9.16.2.11 */
49
50 /* {iso(1) member-body(2) us(840) rsadsi(113549) digestAlgorithm(2)} */
51 OID_md2, /* 1.2.840.113549.2.2 */
52 OID_md4, /* 1.2.840.113549.2.4 */
53 OID_md5, /* 1.2.840.113549.2.5 */
54
55 OID_certAuthInfoAccess, /* 1.3.6.1.5.5.7.1.1 */
56 OID_msOutlookExpress, /* 1.3.6.1.4.1.311.16.4 */
57 OID_sha1, /* 1.3.14.3.2.26 */
58
59 /* Distinguished Name attribute IDs [RFC 2256] */
60 OID_commonName, /* 2.5.4.3 */
61 OID_surname, /* 2.5.4.4 */
62 OID_countryName, /* 2.5.4.6 */
63 OID_locality, /* 2.5.4.7 */
64 OID_stateOrProvinceName, /* 2.5.4.8 */
65 OID_organizationName, /* 2.5.4.10 */
66 OID_organizationUnitName, /* 2.5.4.11 */
67 OID_title, /* 2.5.4.12 */
68 OID_description, /* 2.5.4.13 */
69 OID_name, /* 2.5.4.41 */
70 OID_givenName, /* 2.5.4.42 */
71 OID_initials, /* 2.5.4.43 */
72 OID_generationalQualifier, /* 2.5.4.44 */
73
74 /* Certificate extension IDs */
75 OID_subjectKeyIdentifier, /* 2.5.29.14 */
76 OID_keyUsage, /* 2.5.29.15 */
77 OID_subjectAltName, /* 2.5.29.17 */
78 OID_issuerAltName, /* 2.5.29.18 */
79 OID_basicConstraints, /* 2.5.29.19 */
80 OID_crlDistributionPoints, /* 2.5.29.31 */
81 OID_certPolicies, /* 2.5.29.32 */
82 OID_authorityKeyIdentifier, /* 2.5.29.35 */
83 OID_extKeyUsage, /* 2.5.29.37 */
84
85 OID__NR
86};
87
88extern enum OID look_up_OID(const void *data, size_t datasize);
89
90#endif /* _LINUX_OID_REGISTRY_H */
diff --git a/lib/.gitignore b/lib/.gitignore
index 3bef1ea94c99..09aae85418ab 100644
--- a/lib/.gitignore
+++ b/lib/.gitignore
@@ -3,4 +3,4 @@
3# 3#
4gen_crc32table 4gen_crc32table
5crc32table.h 5crc32table.h
6 6oid_registry_data.c
diff --git a/lib/Kconfig b/lib/Kconfig
index bb94c1ba616a..4b31a46fb307 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -396,4 +396,9 @@ config SIGNATURE
396config LIBFDT 396config LIBFDT
397 bool 397 bool
398 398
399config OID_REGISTRY
400 tristate
401 help
402 Enable fast lookup object identifier registry.
403
399endmenu 404endmenu
diff --git a/lib/Makefile b/lib/Makefile
index 42d283edc4d3..b0428960939f 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -150,3 +150,19 @@ quiet_cmd_crc32 = GEN $@
150 150
151$(obj)/crc32table.h: $(obj)/gen_crc32table 151$(obj)/crc32table.h: $(obj)/gen_crc32table
152 $(call cmd,crc32) 152 $(call cmd,crc32)
153
154#
155# Build a fast OID lookip registry from include/linux/oid_registry.h
156#
157obj-$(CONFIG_OID_REGISTRY) += oid_registry.o
158
159$(obj)/oid_registry.c: $(obj)/oid_registry_data.c
160
161$(obj)/oid_registry_data.c: $(srctree)/include/linux/oid_registry.h \
162 $(src)/build_OID_registry
163 $(call cmd,build_OID_registry)
164
165quiet_cmd_build_OID_registry = GEN $@
166 cmd_build_OID_registry = perl $(srctree)/$(src)/build_OID_registry $< $@
167
168clean-files += oid_registry_data.c
diff --git a/lib/build_OID_registry b/lib/build_OID_registry
new file mode 100755
index 000000000000..dfbdaab81bc8
--- /dev/null
+++ b/lib/build_OID_registry
@@ -0,0 +1,209 @@
1#!/usr/bin/perl -w
2#
3# Build a static ASN.1 Object Identified (OID) registry
4#
5# Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
6# Written by David Howells (dhowells@redhat.com)
7#
8# This program is free software; you can redistribute it and/or
9# modify it under the terms of the GNU General Public Licence
10# as published by the Free Software Foundation; either version
11# 2 of the Licence, or (at your option) any later version.
12#
13
14use strict;
15
16my @names = ();
17my @oids = ();
18
19if ($#ARGV != 1) {
20 print STDERR "Format: ", $0, " <in-h-file> <out-c-file>\n";
21 exit(2);
22}
23
24#
25# Open the file to read from
26#
27open IN_FILE, "<$ARGV[0]" || die;
28while (<IN_FILE>) {
29 chomp;
30 if (m!\s+OID_([a-zA-z][a-zA-Z0-9_]+),\s+/[*]\s+([012][.0-9]*)\s+[*]/!) {
31 push @names, $1;
32 push @oids, $2;
33 }
34}
35close IN_FILE || die;
36
37#
38# Open the files to write into
39#
40open C_FILE, ">$ARGV[1]" or die;
41print C_FILE "/*\n";
42print C_FILE " * Automatically generated by ", $0, ". Do not edit\n";
43print C_FILE " */\n";
44
45#
46# Split the data up into separate lists and also determine the lengths of the
47# encoded data arrays.
48#
49my @indices = ();
50my @lengths = ();
51my $total_length = 0;
52
53print "Compiling ", $#names + 1, " OIDs\n";
54
55for (my $i = 0; $i <= $#names; $i++) {
56 my $name = $names[$i];
57 my $oid = $oids[$i];
58
59 my @components = split(/[.]/, $oid);
60
61 # Determine the encoded length of this OID
62 my $size = $#components;
63 for (my $loop = 2; $loop <= $#components; $loop++) {
64 my $c = $components[$loop];
65
66 # We will base128 encode the number
67 my $tmp = ($c == 0) ? 0 : int(log($c)/log(2));
68 $tmp = int($tmp / 7);
69 $size += $tmp;
70 }
71 push @lengths, $size;
72 push @indices, $total_length;
73 $total_length += $size;
74}
75
76#
77# Emit the look-up-by-OID index table
78#
79print C_FILE "\n";
80if ($total_length <= 255) {
81 print C_FILE "static const unsigned char oid_index[OID__NR + 1] = {\n";
82} else {
83 print C_FILE "static const unsigned short oid_index[OID__NR + 1] = {\n";
84}
85for (my $i = 0; $i <= $#names; $i++) {
86 print C_FILE "\t[OID_", $names[$i], "] = ", $indices[$i], ",\n"
87}
88print C_FILE "\t[OID__NR] = ", $total_length, "\n";
89print C_FILE "};\n";
90
91#
92# Encode the OIDs
93#
94my @encoded_oids = ();
95
96for (my $i = 0; $i <= $#names; $i++) {
97 my @octets = ();
98
99 my @components = split(/[.]/, $oids[$i]);
100
101 push @octets, $components[0] * 40 + $components[1];
102
103 for (my $loop = 2; $loop <= $#components; $loop++) {
104 my $c = $components[$loop];
105
106 # Base128 encode the number
107 my $tmp = ($c == 0) ? 0 : int(log($c)/log(2));
108 $tmp = int($tmp / 7);
109
110 for (; $tmp > 0; $tmp--) {
111 push @octets, (($c >> $tmp * 7) & 0x7f) | 0x80;
112 }
113 push @octets, $c & 0x7f;
114 }
115
116 push @encoded_oids, \@octets;
117}
118
119#
120# Create a hash value for each OID
121#
122my @hash_values = ();
123for (my $i = 0; $i <= $#names; $i++) {
124 my @octets = @{$encoded_oids[$i]};
125
126 my $hash = $#octets;
127 foreach (@octets) {
128 $hash += $_ * 33;
129 }
130
131 $hash = ($hash >> 24) ^ ($hash >> 16) ^ ($hash >> 8) ^ ($hash);
132
133 push @hash_values, $hash & 0xff;
134}
135
136#
137# Emit the OID data
138#
139print C_FILE "\n";
140print C_FILE "static const unsigned char oid_data[", $total_length, "] = {\n";
141for (my $i = 0; $i <= $#names; $i++) {
142 my @octets = @{$encoded_oids[$i]};
143 print C_FILE "\t";
144 print C_FILE $_, ", " foreach (@octets);
145 print C_FILE "\t// ", $names[$i];
146 print C_FILE "\n";
147}
148print C_FILE "};\n";
149
150#
151# Build the search index table (ordered by length then hash then content)
152#
153my @index_table = ( 0 .. $#names );
154
155@index_table = sort {
156 my @octets_a = @{$encoded_oids[$a]};
157 my @octets_b = @{$encoded_oids[$b]};
158
159 return $hash_values[$a] <=> $hash_values[$b]
160 if ($hash_values[$a] != $hash_values[$b]);
161 return $#octets_a <=> $#octets_b
162 if ($#octets_a != $#octets_b);
163 for (my $i = $#octets_a; $i >= 0; $i--) {
164 return $octets_a[$i] <=> $octets_b[$i]
165 if ($octets_a[$i] != $octets_b[$i]);
166 }
167 return 0;
168
169} @index_table;
170
171#
172# Emit the search index and hash value table
173#
174print C_FILE "\n";
175print C_FILE "static const struct {\n";
176print C_FILE "\tunsigned char hash;\n";
177if ($#names <= 255) {
178 print C_FILE "\tenum OID oid : 8;\n";
179} else {
180 print C_FILE "\tenum OID oid : 16;\n";
181}
182print C_FILE "} oid_search_table[OID__NR] = {\n";
183for (my $i = 0; $i <= $#names; $i++) {
184 my @octets = @{$encoded_oids[$index_table[$i]]};
185 printf(C_FILE "\t[%3u] = { %3u, OID_%-35s }, // ",
186 $i,
187 $hash_values[$index_table[$i]],
188 $names[$index_table[$i]]);
189 printf C_FILE "%02x", $_ foreach (@octets);
190 print C_FILE "\n";
191}
192print C_FILE "};\n";
193
194#
195# Emit the OID debugging name table
196#
197#print C_FILE "\n";
198#print C_FILE "const char *const oid_name_table[OID__NR + 1] = {\n";
199#
200#for (my $i = 0; $i <= $#names; $i++) {
201# print C_FILE "\t\"", $names[$i], "\",\n"
202#}
203#print C_FILE "\t\"Unknown-OID\"\n";
204#print C_FILE "};\n";
205
206#
207# Polish off
208#
209close C_FILE or die;
diff --git a/lib/oid_registry.c b/lib/oid_registry.c
new file mode 100644
index 000000000000..33cfd171f627
--- /dev/null
+++ b/lib/oid_registry.c
@@ -0,0 +1,89 @@
1/* ASN.1 Object identifier (OID) registry
2 *
3 * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
10 */
11
12#include <linux/export.h>
13#include <linux/oid_registry.h>
14#include "oid_registry_data.c"
15
16/**
17 * look_up_OID - Find an OID registration for the specified data
18 * @data: Binary representation of the OID
19 * @datasize: Size of the binary representation
20 */
21enum OID look_up_OID(const void *data, size_t datasize)
22{
23 const unsigned char *octets = data;
24 enum OID oid;
25 unsigned char xhash;
26 unsigned i, j, k, hash;
27 size_t len;
28
29 /* Hash the OID data */
30 hash = datasize - 1;
31
32 for (i = 0; i < datasize; i++)
33 hash += octets[i] * 33;
34 hash = (hash >> 24) ^ (hash >> 16) ^ (hash >> 8) ^ hash;
35 hash &= 0xff;
36
37 /* Binary search the OID registry. OIDs are stored in ascending order
38 * of hash value then ascending order of size and then in ascending
39 * order of reverse value.
40 */
41 i = 0;
42 k = OID__NR;
43 while (i < k) {
44 j = (i + k) / 2;
45
46 xhash = oid_search_table[j].hash;
47 if (xhash > hash) {
48 k = j;
49 continue;
50 }
51 if (xhash < hash) {
52 i = j + 1;
53 continue;
54 }
55
56 oid = oid_search_table[j].oid;
57 len = oid_index[oid + 1] - oid_index[oid];
58 if (len > datasize) {
59 k = j;
60 continue;
61 }
62 if (len < datasize) {
63 i = j + 1;
64 continue;
65 }
66
67 /* Variation is most likely to be at the tail end of the
68 * OID, so do the comparison in reverse.
69 */
70 while (len > 0) {
71 unsigned char a = oid_data[oid_index[oid] + --len];
72 unsigned char b = octets[len];
73 if (a > b) {
74 k = j;
75 goto next;
76 }
77 if (a < b) {
78 i = j + 1;
79 goto next;
80 }
81 }
82 return oid;
83 next:
84 ;
85 }
86
87 return OID__NR;
88}
89EXPORT_SYMBOL_GPL(look_up_OID);
generated by cgit v1.2.2 (git 2.25.0) at 2026-07-22 11:45:44 -0400