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package main
import (
"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")
secFile = opts.String("s", "", "Secret file (required)")
msgFile = opts.String("m", "", "Message file (required)")
)
opts.Parse(args)
if *secFile == "" || *msgFile == "" {
opts.Usage()
return nil
}
if *sigFile == "" {
*sigFile = file.SigName(*msgFile)
}
switch {
case *zip && *embedded:
return ErrEZ
case *zip:
if err := signGzip(*secFile, *msgFile, *sigFile); err != nil {
return err
}
case *embedded:
if err := signEmbedded(*secFile, *msgFile, *sigFile); err != nil {
return err
}
default:
if err := signPlain(*secFile, *msgFile, *sigFile); err != nil {
return err
}
}
return nil
}
func signPlain(secFile, msgFile, sigFile string) error {
sec, err := openSec(secFile)
if err != nil {
return err
}
msg, err := ioutil.ReadFile(msgFile)
if err != nil {
return err
}
sig := sec.Sign(msg)
comment := file.VerifyWith(secFile)
return file.EncodeFile(sigFile, file.ModeSig, sig, comment, nil)
}
func signEmbedded(secFile, msgFile, sigFile string) error {
sec, err := openSec(secFile)
if err != nil {
return err
}
msg, err := ioutil.ReadFile(msgFile)
if err != nil {
return err
}
sig := sec.Sign(msg)
comment := file.VerifyWith(secFile)
return file.EncodeFile(sigFile, file.ModeSig, sig, comment, msg)
}
func signGzip(secFile, msgFile, sigFile string) error {
return nil
}
func openSec(fname string) (*key.Sec, error) {
sec := new(key.Sec)
if _, _, err := file.DecodeFile(fname, 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
}
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