pgp - How to get public key from private in gpg without using local storage (under ~/.gpg)?

Question

Look to Subj: How to get public key from private in gpg without using local storage (under ~/.gpg)?

This solution does not satisfy requirements:

  $ gpg --import priv.key
  $ gpg --export $KEYID >pub.key
  $ gpg --delete-secret-and-public-key $KEYID

Answer 1

あなたがすでに思いついた解決策に満足していない理由がわかりませんが、何らかの理由で個人のキーリングをいじりたくない場合は、別の方法を提案できます。

gtmp=$(mktemp -d)
gpg --homedir $gtmp --import key
gpg --homedir $gtmp --export key > pub.gpg
rm -rf $gtmp

または、便利な BASH 関数として:

# Requires keyfile as 1st argument; optional 2nd argument is output file
gpg_priv_to_pub(){
  g=$(mktemp -d)
  infile=$1
  [[ $# > 1 ]] && outfile=$2 || outfile=${1%.*}_pub.gpg
  gpg --homedir $g --import "$infile" 2>/dev/null
  KEYID=$(gpg --homedir $g -k --with-colons | awk -F: '/^pub/{print $5}')
  gpg --homedir $g --export $KEYID > "$outfile"
  rm -rf $g
  echo "Public key $KEYID extracted from '$infile' and saved to '$outfile'"
  }