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utils.go
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utils.go
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package main
import (
"encoding/json"
"errors"
"fmt"
"math/big"
starknetgo "github.com/NethermindEth/starknet.go"
"github.com/NethermindEth/starknet.go/types"
"github.com/urfave/cli/v2"
)
var signFlags = []cli.Flag{
&cli.StringFlag{
Name: "private-key",
Aliases: []string{"p"},
Usage: "private key used to sign a message",
}}
var verifyFlags = []cli.Flag{
&cli.StringFlag{
Name: "public-key",
Aliases: []string{"p"},
Usage: "public key used to sign a message",
},
&cli.StringFlag{
Name: "s0",
Usage: "first signature",
},
&cli.StringFlag{
Name: "s1",
Usage: "2nd signature",
},
}
var utilsCommand = cli.Command{
Name: "utils",
Aliases: []string{"u"},
Usage: "utilities to encode/decode felt and entrypoints",
Subcommands: []*cli.Command{
{
Name: "felt",
Usage: "display felts in different formats",
Action: func(cCtx *cli.Context) error {
for _, v := range cCtx.Args().Slice() {
fmt.Printf("value: %s\n", v)
vInt, ok := big.NewInt(0).SetString(v, 0)
if !ok {
fmt.Println("could not guess format")
}
fmt.Printf("decimal: %s\n", vInt.Text(10))
fmt.Printf("hex: 0x%s\n", vInt.Text(16))
fmt.Println()
}
return nil
},
},
{
Name: "entrypoint",
Usage: "display entrypoints in different formats",
Action: func(cCtx *cli.Context) error {
for _, v := range cCtx.Args().Slice() {
fmt.Printf("value: %s\n", v)
fmt.Printf("decimal: %s\n", types.GetSelectorFromName(v).Text(10))
fmt.Printf("hex: 0x%s\n", types.GetSelectorFromName(v).Text(16))
fmt.Println()
}
return nil
},
},
{
Name: "guess",
Usage: "guess an entrypoint from a dictionary",
Action: func(cCtx *cli.Context) error {
dict := map[string]string{}
err := json.Unmarshal(dictionary, &dict)
if err != nil {
return err
}
v := cCtx.Args().First()
vInt, ok := big.NewInt(0).SetString(v, 0)
if !ok {
return errors.New("not a number")
}
value, ok := dict[fmt.Sprintf("0x%s", vInt.Text(16))]
if !ok {
fmt.Println("key not in dictionary")
return nil
}
fmt.Printf("guess: %s\n", value)
fmt.Printf("decimal: %s\n", types.GetSelectorFromName(value).Text(10))
fmt.Printf("hex: 0x%s\n", types.GetSelectorFromName(value).Text(16))
fmt.Println()
return nil
},
},
{
Name: "publickey",
Usage: "get a public key from the private key",
Action: func(cCtx *cli.Context) error {
privateKey := cCtx.Args().First()
privateKeyInt, ok := big.NewInt(0).SetString(privateKey, 0)
if !ok {
return errors.New("not a number")
}
publicKey, _, err := starknetgo.Curve.PrivateToPoint(privateKeyInt)
if err != nil {
return err
}
fmt.Printf("public key: 0x%s\n", publicKey.Text(16))
fmt.Printf("public key: %s\n", publicKey.Text(10))
fmt.Println()
return nil
},
},
{
Name: "sign",
Usage: "sign a message with a private key",
Flags: signFlags,
Action: func(cCtx *cli.Context) error {
if !cCtx.IsSet("private-key") {
return errors.New("private key is mandatory")
}
privateKey := cCtx.String("private-key")
privateKeyInt, ok := big.NewInt(0).SetString(privateKey, 0)
if !ok {
return errors.New("not a number")
}
message := cCtx.Args().First()
messageInt, ok := big.NewInt(0).SetString(message, 0)
if !ok {
return errors.New("not a number")
}
publicKey, _, err := starknetgo.Curve.PrivateToPoint(privateKeyInt)
if err != nil {
return err
}
x, y, err := starknetgo.Curve.Sign(messageInt, privateKeyInt)
if err != nil {
return err
}
fmt.Printf("public key: 0x%s\n", publicKey.Text(16))
fmt.Printf("public key: %s\n", publicKey.Text(10))
fmt.Printf("signature[0]: 0x%s\n", x.Text(16))
fmt.Printf("signature[0]: %s\n", x.Text(10))
fmt.Printf("signature[1]: 0x%s\n", y.Text(16))
fmt.Printf("signature[1]: %s\n", y.Text(10))
fmt.Println()
return nil
},
},
{
Name: "verify",
Usage: "verify a signature with a public key and the message",
Flags: verifyFlags,
Action: func(cCtx *cli.Context) error {
if !cCtx.IsSet("public-key") {
return errors.New("public key is mandatory")
}
if !cCtx.IsSet("s0") {
return errors.New("s0 is mandatory")
}
if !cCtx.IsSet("s1") {
return errors.New("s1 is mandatory")
}
publicKey := cCtx.String("public-key")
publicKeyInt, ok := big.NewInt(0).SetString(publicKey, 0)
if !ok {
return errors.New("not a number")
}
y := starknetgo.Curve.GetYCoordinate(publicKeyInt)
s0 := cCtx.String("s0")
s0Int, ok := big.NewInt(0).SetString(s0, 0)
if !ok {
return errors.New("not a number")
}
s1 := cCtx.String("s1")
s1Int, ok := big.NewInt(0).SetString(s1, 0)
if !ok {
return errors.New("not a number")
}
message := cCtx.Args().First()
messageInt, ok := big.NewInt(0).SetString(message, 0)
if !ok {
return errors.New("not a number")
}
ok = starknetgo.Curve.Verify(messageInt, s0Int, s1Int, publicKeyInt, y)
if !ok {
return errors.New("invalid signature")
}
fmt.Println("signature is valid")
fmt.Println()
return nil
},
},
},
}