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Issue 3124004: Changes to allow user-signed kernels to be generated. (Closed) Base URL: ssh://gitrw.chromium.org/vboot_reference.git
Patch Set: Respond to feedback Created 10 years, 4 months ago
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1 #!/bin/bash -e
2 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
3 # Use of this source code is governed by a BSD-style license that can be
4 # found in the LICENSE file.
5 #
6
7 # Check args first.
8 if [ "$#" -lt "1" ]; then
9 cat <<EOF 1>&2
10
11 Usage: ${0##*/} BASENAME [ALG]
12
13 This creates BASENAME.vbpubk and BASENAME.vbprivk pairs for use in signing
14 developer files. This also creates a BASENAME.keyblock file containing the
15 BASENAME.vbpubk, which can be used to sign a developer kernel.
16
17 If specified, ALG is one of:
18
19 0 = RSA1024 with SHA1
20 1 = RSA1024 with SHA256
21 2 = RSA1024 with SHA512
22 3 = RSA2048 with SHA1
23 4 = RSA2048 with SHA256
24 5 = RSA2048 with SHA512
25 6 = RSA4096 with SHA1
26 7 = RSA4096 with SHA256
27 8 = RSA4096 with SHA512
28 9 = RSA8192 with SHA1
29 10 = RSA8192 with SHA256
30 11 = RSA8192 with SHA512
31
32 If ALG is not specified, a default value will be used.
33
34 EOF
35 exit 1
36 fi
37
38
39 # Compute the key length assuming the sizes shown above.
40 function alg_to_keylen {
41 echo $(( 1 << (10 + ($1 / 3)) ))
42 }
43
44 # Emit .vbpubk and .vbprivk using given basename and algorithm.
45 function make_pair {
46 local base=$1
47 local alg=$2
48 local len=$(alg_to_keylen $alg)
49
50 # make the RSA keypair
51 openssl genrsa -F4 -out "${base}_${len}.pem" $len
52 # create a self-signed certificate
53 openssl req -batch -new -x509 -key "${base}_${len}.pem" \
54 -out "${base}_${len}.crt"
55 # generate pre-processed RSA public key
56 dumpRSAPublicKey "${base}_${len}.crt" > "${base}_${len}.keyb"
57
58 # wrap the public key
59 vbutil_key \
60 --pack "${base}.vbpubk" \
61 --key "${base}_${len}.keyb" \
62 --version 1 \
63 --algorithm $alg
64
65 # wrap the private key
66 vbutil_key \
67 --pack "${base}.vbprivk" \
68 --key "${base}_${len}.pem" \
69 --algorithm $alg
70
71 # remove intermediate files
72 rm -f "${base}_${len}.pem" "${base}_${len}.crt" "${base}_${len}.keyb"
73 }
74
75 # First create the .vbpubk and .vbprivk pair.
76 make_pair "$1" "${2:-4}"
77
78 # Now create a .vblock to hold our .vbpubk. Since it's for developer use, it
79 # won't be signed, just checksummed. Developer kernels can only be run in
80 # non-recovery mode with the developer switch enabled, but it won't hurt us to
81 # turn on all the flags bits anyway.
82 vbutil_keyblock --pack "$1.keyblock" --datapubkey "$1.vbpubk" --flags 15
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