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      1 #!/bin/bash
      2 #
      3 # Copyright (C) 2009 The Android Open Source Project
      4 #
      5 # Licensed under the Apache License, Version 2.0 (the "License");
      6 # you may not use this file except in compliance with the License.
      7 # You may obtain a copy of the License at
      8 #
      9 #      http://www.apache.org/licenses/LICENSE-2.0
     10 #
     11 # Unless required by applicable law or agreed to in writing, software
     12 # distributed under the License is distributed on an "AS IS" BASIS,
     13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14 # See the License for the specific language governing permissions and
     15 # limitations under the License.
     16 
     17 # Generates a public/private key pair suitable for use in signing
     18 # android .apks and OTA update packages.
     19 
     20 if [ "$#" -lt 2 -o "$#" -gt 3 ]; then
     21   cat <<EOF
     22 Usage: $0 <name> <subject> [<keytype>]
     23 
     24 Creates <name>.pk8 key and <name>.x509.pem cert.  Cert contains the
     25 given <subject>. A keytype of "rsa" or "ec" is accepted.
     26 EOF
     27   exit 2
     28 fi
     29 
     30 if [[ -e $1.pk8 || -e $1.x509.pem ]]; then
     31   echo "$1.pk8 and/or $1.x509.pem already exist; please delete them first"
     32   echo "if you want to replace them."
     33   exit 1
     34 fi
     35 
     36 # Use named pipes to connect get the raw RSA private key to the cert-
     37 # and .pk8-creating programs, to avoid having the private key ever
     38 # touch the disk.
     39 
     40 tmpdir=$(mktemp -d)
     41 trap 'rm -rf ${tmpdir}; echo; exit 1' EXIT INT QUIT
     42 
     43 one=${tmpdir}/one
     44 two=${tmpdir}/two
     45 mknod ${one} p
     46 mknod ${two} p
     47 chmod 0600 ${one} ${two}
     48 
     49 read -p "Enter password for '$1' (blank for none; password will be visible): " \
     50   password
     51 
     52 if [ "${3}" = "rsa" -o "$#" -eq 2 ]; then
     53   ( openssl genrsa -f4 2048 | tee ${one} > ${two} ) &
     54   hash="-sha1"
     55 elif [ "${3}" = "ec" ]; then
     56   ( openssl ecparam -name prime256v1 -genkey -noout | tee ${one} > ${two} ) &
     57   hash="-sha256"
     58 else
     59   echo "Only accepts RSA or EC keytypes."
     60   exit 1
     61 fi
     62 
     63 openssl req -new -x509 ${hash} -key ${two} -out $1.x509.pem \
     64   -days 10000 -subj "$2" &
     65 
     66 if [ "${password}" == "" ]; then
     67   echo "creating ${1}.pk8 with no password"
     68   openssl pkcs8 -in ${one} -topk8 -outform DER -out $1.pk8 -nocrypt
     69 else
     70   echo "creating ${1}.pk8 with password [${password}]"
     71   export password
     72   openssl pkcs8 -in ${one} -topk8 -outform DER -out $1.pk8 \
     73     -passout env:password
     74   unset password
     75 fi
     76 
     77 wait
     78 wait
     79