// GenKey calculates a keypair fit for signing, including hashcahs
func GenKey(bits byte) (keypair *SignKeyPair, err error) {
pubkey, privkey, err := ed25519.GenerateKey(randSource)
if err != nil {
return nil, err
}
nonce, ok := hashcash.ComputeNonceSelect(pubkey[:], bits, 0, 0)
if !ok {
return nil, ErrNoKeyFound
}
sk := SignKeyPair{
PublicKey: pubkey,
PrivateKey: privkey,
Bits: bits,
}
copy(sk.Nonce[:], nonce)
return &sk, nil
}
func main() {
flag.Parse()
if *contCalc && *outFile != "" {
// Read token
d, err := utils.MaxReadFile(2048, *outFile)
if err != nil {
fmt.Printf("%s\n", err)
os.Exit(1)
}
kpt := new(message.SignKeyPair)
kp, err := kpt.Unmarshal(d)
if err != nil {
fmt.Printf("%s\n", err)
os.Exit(1)
}
fmt.Print("Continue")
start := hashcash.NonceToUInt64(kp.Nonce[:])
_, startBits := hashcash.TestNonce(kp.PublicKey[:], kp.Nonce[:], 0)
if len(d) == (ed25519.PublicKeySize + ed25519.PrivateKeySize + hashcash.NonceSize + 1 + 8) {
fmt.Print(" from state ")
start = hashcash.NonceToUInt64(d[ed25519.PublicKeySize+ed25519.PrivateKeySize+hashcash.NonceSize+1 : ed25519.PublicKeySize+ed25519.PrivateKeySize+hashcash.NonceSize+1+8])
}
fmt.Printf(" (%d, bits: %d) ", start, startBits)
for {
startBits++
nonce, _ := hashcash.ComputeNonceSelect(kp.PublicKey[:], startBits, start, start+hashcash.Steps*8)
start = hashcash.NonceToUInt64(nonce[:])
_, nextBits := hashcash.TestNonce(kp.PublicKey[:], nonce, 0)
if nextBits > startBits {
fmt.Printf("(%d)", nextBits)
copy(kp.Nonce[:], nonce)
kp.Bits = nextBits
startBits = nextBits
}
fmt.Print(".")
newData := append(kp.Marshal(), nonce[:]...)
err := utils.OverWriteFile(*outFile, newData)
if err != nil {
fmt.Printf("%s\n", err)
os.Exit(1)
}
if nextBits > byte(*minbits) {
fmt.Printf("\n%d reached. Finish.\n", nextBits)
os.Exit(0)
}
}
} else if *outDir == "" {
keypair, err := message.GenKey(byte(*minbits))
if err != nil {
fmt.Printf("%s\n", err)
os.Exit(1)
}
b := keypair.Marshal()
if *outFile != "" {
err := utils.WriteNewFile(*outFile, b)
if err != nil {
fmt.Printf("%s\n", err)
os.Exit(1)
}
} else {
os.Stdout.Write(b)
os.Stdout.Sync()
os.Exit(0)
}
} else {
for {
keypair, err := message.GenKey(byte(*minbits))
if err != nil {
fmt.Printf("%s\n", err)
os.Exit(1)
}
b := keypair.Marshal()
err = utils.WriteNewFile(*outDir+string(os.PathSeparator)+strconv.Itoa(int(time.Now().Unix()))+strconv.Itoa(int(time.Now().Nanosecond()))+".hashcash", b)
if err != nil {
fmt.Printf("%s\n", err)
os.Exit(1)
}
}
}
}