feat: Waku v2 bridge

Issue #12610

vendor/github.com/status-im/status-go/api/utils.go

@@ -0,0 +1,61 @@
+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
+}