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Filename : decrypt_gnupg

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#!/bin/sh

decrypt_gpg () {
	echo "Performing GPG symmetric decryption ..." >&2
	if ! /lib/cryptsetup/askpass "Enter passphrase for key $1: " | \
		/usr/bin/gpg -q --batch --no-options  \
		--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 $?