mdw@git.distorted.org.uk Git - distorted-keys/blob - ktype.openssl

   1 ### -*-sh-*-
   2 ###
   3 ### Key type for OpenSSL
   4 ###
   5 ### (c) 2015 Mark Wooding
   6 ###
   7
   8 ###----- Licensing notice ---------------------------------------------------
   9 ###
  10 ### This file is part of the distorted.org.uk key management suite.
  11 ###
  12 ### distorted-keys is free software; you can redistribute it and/or modify
  13 ### it under the terms of the GNU General Public License as published by
  14 ### the Free Software Foundation; either version 2 of the License, or
  15 ### (at your option) any later version.
  16 ###
  17 ### distorted-keys is distributed in the hope that it will be useful,
  18 ### but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ### GNU General Public License for more details.
  21 ###
  22 ### You should have received a copy of the GNU General Public License
  23 ### along with distorted-keys; if not, write to the Free Software Foundation,
  24 ### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25
  26 R_OPT="$R_IDENT:$R_IDENT"
  27 R_OPTSEQ="$R_OPT\([[:space:]][[:space:]]*$R_OPT\)*"
  28
  29 R_TYPE="[$R_IDENTCHARS[:space:]][$R_IDENTCHARS[:space:]]*"
  30 R_BASE64="[a-zA-Z0-9+/]*=*"
  31 R_PARAMS="$R_TYPE:$R_BASE64"
  32
  33 defprops k_props <<EOF
  34 algorithm               t       $R_WORD
  35 opts                    t       $R_OPTSEQ
  36 params                  t       $R_PARAMS
  37 fresh_params_p          t       $R_IDENT
  38 cipher                  t       $R_WORD
  39 sig_opts                t       $R_OPTSEQ
  40 enc_opts                t       $R_OPTSEQ
  41 EOF
  42
  43 : ${kprop_cipher=aes-256-cbc}
  44 : ${kprop_fresh_params_p=nil}; boolify kprop_fresh_params_p
  45 have_opts_p=${kprop_opts+t}${kprop_opts-nil}
  46 have_params_p=${kprop_params+t}${kprop_params-nil}
  47 have_alg_p=${kprop_algorithm+t}${kprop_algorithm-nil}
  48
  49 pem_to_line () {
  50   ## Read an OpenSSL PEM file from stdin and write a condensed one-line
  51   ## version to stdout.
  52   sed '/^-----BEGIN \(.*\)-----$/s//\1:/; /^-----END .*-----$/d' |
  53   tr -d '\n'
  54 }
  55
  56 line_to_pem () {
  57   line=$1
  58   ## Write to stdout an OpenSSL PEM file corresponding to LINE.
  59
  60   ty=${line%%:*}
  61   echo "-----BEGIN $ty-----"
  62   echo "${line#*:}" | fold -w64
  63   echo "-----END $ty-----";
  64 }
  65
  66 intersperse_opts () {
  67   flag=$1 opts=$2
  68
  69   args= sep=
  70   for i in $opts; do args="$args$sep$flag $i" sep=" "; done
  71   echo "$args"
  72 }
  73
  74 k_generate() {
  75   base=$1 nub=$2
  76
  77   ## Convert the options into OpenSSL command-line options.
  78   opts=$(intersperse_opts -pkeyopt "$kprop_opts")
  79
  80   ## Prepare our ducks, ensuring that they're collinear.
  81   case $have_params_p,$have_alg_p,$kprop_fresh_params_p,$have_opts_p in
  82     t,nil,nil,nil)
  83       line_to_pem "$kprop_params" >$TMP/param
  84       args="-paramfile $TMP/param"
  85       ;;
  86     nil,t,t,*)
  87       openssl genpkey -genparam -algorithm $kprop_algorithm $opts >$TMP/param
  88       args="-paramfile $TMP/param"
  89       ;;
  90     nil,t,nil,*)
  91       args="-algorithm $kprop_algorithm $opts"
  92       ;;
  93     *)
  94       echo >&2 "$quis: invalid combination of properties"
  95       exit 1
  96       ;;
  97   esac
  98
  99   ## Generate the private key.
 100   openssl -cipher $kprop_cipher -pass file:"$nub" -out "$base/priv"
 101
 102   ## Extract the public key.
 103   openssl -passin file:"$nub" -in "$base/priv" -pubout "$base/pub"
 104 }
 105
 106 k_encrypt () {
 107   base=$1
 108
 109   openssl pkeyutl -encrypt -pubin -inkey "$base/pub" \
 110     $(intersperse_opts -pkeyopt "$kprop_enc_opts")
 111 }
 112
 113 k_decrypt () {
 114   base=$1 nub=$2
 115
 116   openssl pkeyutl -decrypt -passin file:"$nub" -inkey "$base/priv"
 117 }
 118
 119 k_sign () {
 120   base=$1 nub=$2
 121
 122   openssl pkeyutl -sign -passin file:"$nub" -inkey "$base/priv" \
 123     $(intersperse_opts -pkeyopt "$kprop_sig_opts") >$TMP/sig
 124   pem_to_line <$TMP/sig
 125 }
 126
 127 k_verify () {
 128   base=$1 sig=$3
 129
 130   line_to_pem "$3" >$TMP/sig
 131   openssl pkeyutl -verify -pubin -inkey "$base/pub" -sigfile $TMP/sig
 132 }
 133
 134 ###----- That's all, folks --------------------------------------------------