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package main

import (
	"os"

	"dim13.org/signify/ask"
	"dim13.org/signify/b64file"
	"dim13.org/signify/key"
)

const (
	ModeSec os.FileMode = 0600
	ModePub os.FileMode = 0644
	ModeSig os.FileMode = 0644
)

func Open(fname string) (*os.File, error) {
	return os.OpenFile(fname, os.O_RDONLY, 0)
}

func Create(fname string, perm os.FileMode) (*os.File, error) {
	return os.OpenFile(fname, os.O_WRONLY|os.O_CREATE|os.O_EXCL, perm)
}

func openSec(fname string) (*key.Sec, error) {
	sec := new(key.Sec)
	fd, err := Open(fname)
	if err != nil {
		return nil, err
	}
	defer fd.Close()
	if _, _, err := b64file.Decode(fd, sec); err != nil {
		return nil, err
	}
	if err := sec.Crypt(ask.Passphrase{}); err != nil {
		return nil, err
	}
	if err := sec.Validate(); err != nil {
		return nil, err
	}
	return sec, nil
}

func openPub(fname string) (*key.Pub, error) {
	pub := new(key.Pub)
	fd, err := Open(fname)
	if err != nil {
		return nil, err
	}
	defer fd.Close()
	if _, _, err := b64file.Decode(fd, pub); err != nil {
		return nil, err
	}
	if err := pub.Validate(); err != nil {
		return nil, err
	}
	return pub, nil
}

func openSig(fname string) (*key.Sig, []byte, string, error) {
	sig := new(key.Sig)
	fd, err := Open(fname)
	if err != nil {
		return nil, nil, "", err
	}
	defer fd.Close()
	comment, msg, err := b64file.Decode(fd, sig)
	if err != nil {
		return nil, nil, "", err
	}
	if err := sig.Validate(); err != nil {
		return nil, nil, "", err
	}
	pubKey := CommentPubFile(comment)
	return sig, msg, pubKey, nil
}