feat(add wallet related logic): add wallet related logic

add wallet related logic

Author: yuanyu90221

Makefile

@@ -1,11 +1,17 @@
 .PHONY=build
 
 build-client:
-	@CGO_ENABLED=0 GOOS=linux go build -o bin/go-client learn/go-client.go
+	@CGO_ENABLED=0 GOOS=linux go build -o bin/go-client learn/go-client/go-client.go
+
+build-wallet:
+	@CGO_ENABLED=0 GOOS=linux go build -o bin/go-wallet learn/go-wallet/go-wallet.go
 
 run-client: build-client
 	@./bin/go-client
 
+run-wallet: build-wallet
+	@./bin/go-wallet
+
 coverage:
 	@go test -v -cover ./...
 

README.md

@@ -76,4 +76,39 @@ ETH_JSON_RPC_URL=http://localhost:8545
 	fBalance.SetString(balance.String())
 	balanceEther := new(big.Float).Quo(fBalance, big.NewFloat(math.Pow10(18)))
 	fmt.Println("address:", config.AppConfig.EthAddress, "has", balanceEther, "ether")
+```
+
+## wallet concept
+
+![wallet-address](wallet-address.png)
+
+## write logic to generate private key, public key and address
+
+```golang
+package main
+
+import (
+	"fmt"
+	"log"
+
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/crypto"
+)
+
+func main() {
+	pvk, err := crypto.GenerateKey()
+	if err != nil {
+		log.Fatal(err)
+	}
+	// hex value
+	pData := crypto.FromECDSA(pvk)
+	// private key
+	fmt.Println(hexutil.Encode(pData))
+
+	pubData := crypto.FromECDSAPub(&pvk.PublicKey)
+	// public key
+	fmt.Println(hexutil.Encode(pubData))
+	// address
+	fmt.Println(crypto.PubkeyToAddress(pvk.PublicKey).Hex())
+}
 ```

learn/go-client.go renamed to learn/go-client/go-client.go

@@ -0,0 +1,26 @@
+package main
+
+import (
+	"fmt"
+	"log"
+
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/crypto"
+)
+
+func main() {
+	pvk, err := crypto.GenerateKey()
+	if err != nil {
+		log.Fatal(err)
+	}
+	// hex value
+	pData := crypto.FromECDSA(pvk)
+	// private key
+	fmt.Println(hexutil.Encode(pData))
+
+	pubData := crypto.FromECDSAPub(&pvk.PublicKey)
+	// public key
+	fmt.Println(hexutil.Encode(pubData))
+	// address
+	fmt.Println(crypto.PubkeyToAddress(pvk.PublicKey).Hex())
+}