/lib/cryptsetup/scripts/decrypt_gnupg is in cryptsetup 2:1.6.6-5ubuntu2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | #!/bin/sh
decrypt_gpg () {
echo "Performing GPG key decryption ..." >&2
if ! /lib/cryptsetup/askpass "Enter passphrase for key $1: " | \
/usr/bin/gpg -q --batch --no-options --no-mdc-warning \
--no-random-seed-file --no-default-keyring \
--keyring /dev/null --secret-keyring /dev/null \
--trustdb-name /dev/null --passphrase-fd 0 --decrypt $1; then
return 1
fi
return 0
}
if [ ! -x /usr/bin/gpg ]; then
echo "$0: /usr/bin/gpg is not available" >&2
exit 1
fi
if [ -z "$1" ]; then
echo "$0: missing key as argument" >&2
exit 1
fi
decrypt_gpg "$1"
exit $?
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