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tutorial.go
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tutorial.go
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package main
import (
"crypto/rand"
"encoding/hex"
"fmt"
"io/ioutil"
mathrand "math/rand"
"os"
"strings"
"time"
"github.com/mit-dci/dlc-oracle-go"
)
func main() {
privateKey, err := getOrCreateKey()
if err != nil {
panic(err)
}
// Print out the public key for the oracle
pubKey := dlcoracle.PublicKeyFromPrivateKey(privateKey)
fmt.Printf("Oracle public key: %x\n", pubKey)
for {
// Generate a new one-time signing key
privPoint, err := dlcoracle.GenerateOneTimeSigningKey()
if err != nil {
panic(err)
}
// Generate the public key to the one-time signing key (R-point) and print it out
rPoint := dlcoracle.PublicKeyFromPrivateKey(privPoint)
fmt.Printf("R-Point for next publication: %x\n", rPoint)
// Sleep for 1 minute
time.Sleep(time.Second * 60)
// Generate random value between 10000 and 20000
randomValue := uint64(mathrand.Int31n(10000) + 10000)
// Generate message to sign. Uses the same encoding as expected by LIT when settling the contract
message := dlcoracle.GenerateNumericMessage(randomValue)
// Sign the message
signature, err := dlcoracle.ComputeSignature(privateKey, privPoint, message)
if err != nil {
panic(err)
}
// Print out the value and signature
fmt.Printf("Signed message. Value: %d\nSignature: %x\n", randomValue, signature)
}
}
func getOrCreateKey() ([32]byte, error) {
// Initialize the byte array that will hold the generated key
var priv [32]byte
// Check if the privatekey.hex file exists
_, err := os.Stat("privatekey.hex")
if err != nil {
if os.IsNotExist(err) {
// If not, generate a new private key by reading 32 random bytes
rand.Read(priv[:])
// Convert the key in to a hexadecimal format
keyhex := fmt.Sprintf("%x\n", priv[:])
// Save the hexadecimal value into the file
err := ioutil.WriteFile("privatekey.hex", []byte(keyhex), 0600)
if err != nil {
// Unable the save the key file, return the error
return priv, err
}
} else {
// Some other error occurred while checking the file's existence, return the error
return priv, err
}
}
// At this point, the file either existed or is created. Read the private key from the file
keyhex, err := ioutil.ReadFile("privatekey.hex")
if err != nil {
// Unable to read the key file, return the error
return priv, err
}
// Trim any whitespace from the file's contents
keyhex = []byte(strings.TrimSpace(string(keyhex)))
// Decode the hexadecimal format into a byte array
key, err := hex.DecodeString(string(keyhex))
if err != nil {
// Unable to decode the hexadecimal format, return the error
return priv, err
}
// Copy the variable-width byte array key into priv ([32]byte)
copy(priv[:], key[:])
// Return the key
return priv, nil
}