package api import ( "bytes" "encoding/hex" "strconv" "strings" "github.com/status-im/status-go/eth-node/crypto" ) // RunAsync runs the specified function asynchronously. func RunAsync(f func() error) <-chan error { resp := make(chan error, 1) go func() { err := f() resp <- err close(resp) }() return resp } // HashMessage calculates the hash of a message to be safely signed by the keycard // The hash is calulcated as // // keccak256("\x19Ethereum Signed Message:\n"${message length}${message}). // // This gives context to the signed message and prevents signing of transactions. func HashMessage(message string) ([]byte, error) { buf := bytes.NewBufferString("\x19Ethereum Signed Message:\n") if value, ok := decodeHexStrict(message); ok { if _, err := buf.WriteString(strconv.Itoa(len(value))); err != nil { return nil, err } if _, err := buf.Write(value); err != nil { return nil, err } } else { if _, err := buf.WriteString(strconv.Itoa(len(message))); err != nil { return nil, err } if _, err := buf.WriteString(message); err != nil { return nil, err } } return crypto.Keccak256(buf.Bytes()), nil } func decodeHexStrict(s string) ([]byte, bool) { if !strings.HasPrefix(s, "0x") { return nil, false } value, err := hex.DecodeString(s[2:]) if err != nil { return nil, false } return value, true }