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}_${len}.crt" 55 # generate pre-processed RSA public key 56 dumpRSAPublicKey -cert "${base}_${len}.crt" > "${base}_${len}.keyb" 57 58 # wrap the public key 59 futility vbutil_key \ 60 --pack "${base}.vbpubk" \ 61 --key "${base}_${len}.keyb" \ 62 --version 1 \ 63 --algorithm $alg 64 65 # wrap the private key 66 futility vbutil_key \ 67 --pack "${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 .keyblock 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 futility vbutil_keyblock --pack "$1.keyblock" \ 83 --datapubkey "$1.vbpubk" --flags 15 84
