// Initialise the PRNG, TPM, and add initial entropy from host and TPM.
func setup() {
log.Println("initialising PRNG and TPM")
if _, err := os.Stat(seedFile); err == nil {
log.Printf("seed file found; loading PRNG state from %s",
seedFile)
prng, err = fortuna.FromSeed(seedFile)
if err != nil {
log.Fatalf("%v", err)
}
} else {
log.Println("no seed file found, initialising new PRNG")
prng = fortuna.New()
}
tpmSource = fortuna.NewSourceWriter(prng, SourceTPM)
devRandSource = fortuna.NewSourceWriter(prng, SourceDevRand)
connTimeSource = fortuna.NewSourceWriter(prng, SourceConnTime)
var err error
tpmCtx, err = tpm.NewTPMContext()
if err != nil {
log.Fatalf("%v", err)
}
err = refillPRNG()
if err != nil {
log.Fatalf("%v", err)
}
}
// Initialise the PRNG, TPM, and add initial entropy from host and TPM.
func Start(seedFile string) {
if seedFile == "" {
log.Fatal("no seed file specified")
}
config.seedFile = seedFile
config.shutdownChan = make(chan interface{}, 0)
config.entropyChan = make(chan int64, 4)
log.Println("initialising PRNG and TPM")
if _, err := os.Stat(config.seedFile); err == nil {
log.Printf("seed file found; loading PRNG state from %s",
config.seedFile)
config.prng, err = fortuna.FromSeed(config.seedFile)
if err != nil {
log.Fatalf("%v", err)
}
} else {
log.Println("no seed file found, initialising new PRNG")
config.prng = fortuna.New()
}
config.tpmSource = fortuna.NewSourceWriter(config.prng, SourceTPM)
config.devRandSource = fortuna.NewSourceWriter(config.prng, SourceDevRand)
config.connTimeSource = fortuna.NewSourceWriter(config.prng, SourceConnTime)
var err error
config.tpmCtx, err = tpm.NewTPMContext()
if err != nil {
log.Fatalf("%v", err)
}
err = refillPRNG()
if err != nil {
log.Fatalf("%v", err)
}
err = config.prng.WriteSeed(config.seedFile)
if err != nil {
log.Fatalf("%v", err)
}
go logAutoUpdate()
go entropyCheck()
}