add a simple utility for converting seed phrase to private key

Signed-off-by: Jakub Sokołowski <jakub@status.im>

seed2key/README.md

@@ -0,0 +1,12 @@
+# Description
+
+This is a tiny utility for converting a Status seed phrase into a private key.
+
+I created it so I could use my normal Status account with the [status-console-client](https://github.com/status-im/status-console-client).
+
+# Usage
+
+```bash
+ $ echo "this is my secret seed phrase" | go run main.go
+0x334d5305f760c5767e25fd23480a46790ba9c6cc3519196a96675259515128fa
+```

seed2key/main.go

@@ -0,0 +1,29 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/status-im/status-go/extkeys"
+)
+
+func main() {
+	// read the seed phrase from stdin
+	reader := bufio.NewReader(os.Stdin)
+	seedPhrase, err := reader.ReadString('\n')
+	if err != nil {
+		fmt.Printf("failed to read seed phrase from stdin\n")
+		os.Exit(1)
+	}
+	// convert the seed phrase to a private key
+	mnemonic := extkeys.NewMnemonic()
+	masterKey, err := extkeys.NewMaster(mnemonic.MnemonicSeed(seedPhrase, ""))
+	if err != nil {
+		fmt.Printf("can not create master extended key: %v\n", err)
+		os.Exit(1)
+	}
+	// print the private key
+	fmt.Printf("%#x\n", crypto.FromECDSA(masterKey.ToECDSA()))
+}