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package main
import (
"errors"
"flag"
"io/ioutil"
"dim13.org/signify/ask"
"dim13.org/signify/file"
"dim13.org/signify/key"
)
// Usage: signify -S [-ez] [-x sigfile] -s seckey -m message
func sign(args []string) error {
opts := flag.NewFlagSet("sign", flag.ExitOnError)
var (
embedded = opts.Bool("e", false, "Embed the message")
zip = opts.Bool("z", false, "Sign gzip archive") // TODO
sigFile = opts.String("x", "", "Signature file")
encFile = opts.String("s", "", "Secret file (required)")
msgFile = opts.String("m", "", "Message file (required)")
)
opts.Parse(args)
if *embedded && *zip {
return errors.New("can't combine -e and -z options")
}
if *encFile == "" || *msgFile == "" {
opts.Usage()
return nil
}
if *sigFile == "" {
*sigFile = file.SigName(*msgFile)
}
_ = zip // TODO
encKey, err := OpenEnc(*encFile)
if err != nil {
return err
}
body, err := ioutil.ReadFile(*msgFile)
if err != nil {
return err
}
sig := encKey.Sign(body)
raw, err := sig.MarshalBinary()
if err != nil {
return err
}
block := &file.Block{
Comment: file.VerifyWith(*encFile),
Bytes: raw,
}
if *embedded {
block.Message = body // TODO implement as acting on io.Writer
}
if err := file.EncodeFile(*sigFile, file.SigMode, block); err != nil {
return err
}
return nil
}
func OpenEnc(fname string) (*key.Enc, error) {
block, err := file.DecodeFile(fname)
if err != nil {
return nil, err
}
return key.ParseEnc(block.Bytes, ask.Passphrase{})
}
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