// readGroup takes a toml file name and reads the file, returning the entities within
func readGroup(tomlFileName string) (*onet.Roster, error) {
log.Print("Reading From File")
f, err := os.Open(tomlFileName)
if err != nil {
return nil, err
}
el, err := config.ReadGroupToml(f)
if err != nil {
return nil, err
}
if len(el.List) <= 0 {
return nil, errors.New("Empty or invalid group file:" +
tomlFileName)
}
log.Lvl3(el)
return el, err
}
// sign takes a stream and a toml file defining the servers
func sign(r io.Reader, tomlFileName string) (*s.SignatureResponse, error) {
log.Lvl2("Starting signature")
f, err := os.Open(tomlFileName)
if err != nil {
return nil, err
}
el, err := config.ReadGroupToml(f)
if err != nil {
return nil, err
}
if len(el.List) <= 0 {
return nil, errors.New("Empty or invalid cosi group file:" +
tomlFileName)
}
log.Lvl2("Sending signature to", el)
res, err := signStatement(r, el)
if err != nil {
return nil, err
}
return res, nil
}
// verify takes a file and a group-definition, calls the signature
// verification and prints the result. If sigFileName is empty it
// assumes to find the standard signature in fileName.sig
func verify(fileName, sigFileName, groupToml string) error {
// if the file hash matches the one in the signature
log.Lvl4("Reading file " + fileName)
b, err := ioutil.ReadFile(fileName)
if err != nil {
return errors.New("Couldn't open msgFile: " + err.Error())
}
// Read the JSON signature file
log.Lvl4("Reading signature")
var sigBytes []byte
if sigFileName == "" {
log.Print("[+] Reading signature from standard input ...")
sigBytes, err = ioutil.ReadAll(os.Stdin)
} else {
sigBytes, err = ioutil.ReadFile(sigFileName)
}
if err != nil {
return err
}
sig := &s.SignatureResponse{}
log.Lvl4("Unmarshalling signature ")
if err := json.Unmarshal(sigBytes, sig); err != nil {
return err
}
fGroup, err := os.Open(groupToml)
if err != nil {
return err
}
log.Lvl4("Reading group definition")
el, err := config.ReadGroupToml(fGroup)
if err != nil {
return err
}
log.Lvl4("Verfifying signature")
err = verifySignatureHash(b, sig, el)
return err
}