🍻 add crypto sign data function

Author: xingmegshuo

readme.md

@@ -1,3 +1,13 @@
+<!--
+ * @Author: small_ant [email protected]
+ * @Time: 2022-01-15 13:50:16
+ * @LastAuthor: small_ant [email protected]
+ * @lastTime: 2022-12-08 14:33:47
+ * @FileName: readme
+ * @Desc: 
+ * 
+ * Copyright (c) 2022 by small_ant [email protected], All Rights Reserved. 
+-->
 # golang-web3
 
 ## install
@@ -30,4 +40,114 @@ func NewCli(url string) *jsonrpc.Client {
 }
 ```
 
+- 数据签名示例
+
+```go
+    privateKey, _ := crypto.HexToECDSA(key)  // 账户私钥
+    u256, _ := abi.NewType("uint256")
+    account, _ := abi.NewType("address")
+    type Ord struct {
+        Id      *big.Int
+        Account web3.Address
+        Amount  *big.Int
+        Fee     *big.Int
+        Solt    *big.Int
+        End     *big.Int
+        Type    *big.Int
+        State   *big.Int
+    }
+
+     argumentInfo := []*abi.TupleElem{
+        &abi.TupleElem{
+            Name: "id",
+            Elem: u256,
+        },
+        &abi.TupleElem{
+            Name: "account",
+            Elem: account,
+        },
+        &abi.TupleElem{
+            Name: "amount",
+            Elem: u256,
+        },
+        &abi.TupleElem{
+            Name: "solt",
+            Elem: u256,
+        },
+        &abi.TupleElem{
+            Name: "end",
+            Elem: u256,
+        },
+        &abi.TupleElem{
+            Name: "type",
+            Elem: u256,
+        },
+    }
+
+    param := abi.NewTupleType(argumentInfo)
+    
+    // 数据hash
+    hash, _ := param.Encode(&Ord{ 
+        Id:      id,
+        Account: addr,
+        Amount:  withDrawAmount,
+        Fee:     big.NewInt(0),
+        Solt:    solt,
+        End:     endTime,
+        Type:    wType,
+        State:   big.NewInt(0),
+    })
+
+    hashs := crypto.Keccak256Hash(signString(""), crypto.Keccak256(hash)) // 按照合约中的方式组装数据
+    signature, _ := crypto.Sign(hashs.Bytes(), privateKey) // 使用私钥签名获取签名后的数据
+    r,s,v := SignRSV(signature) // 签名后的rsv数据
+```
+
+- 代币转账示例 主币
+
+```go
+
+import(
+    web3 "github.com/mover-code/golang-web3"
+    "github.com/mover-code/golang-web3/jsonrpc"
+    "github.com/mover-code/golang-web3/wallet"
+
+)
+     // rpc地址
+    cli, err := jsonrpc.NewClient(url)
+    if err != nil {
+        panic(fmt.Sprintf("error:%s", url))
+    }
+
+    block, _ := cli.Eth().BlockNumber() // 获取当前区块
+    balance, _ := cli.Eth().GetBalance(web3.HexToAddress(addr), web3.BlockNumber(block)) // 查询账户余额
+
+    nonce, err := cli.Eth().GetNonce(sender, web3.BlockNumber(block)) // 发起交易账户的序号
+    gas, _ := cli.Eth().GasPrice() // 当前gas
+    gasLimit, err := cli.Eth().EstimateGas(&web3.CallMsg{
+        From:     sender,    // 发起账户
+        To:       &receiver, // 接收账户
+        GasPrice: gas,
+        Value:    big.NewInt(amount), // 转账金额
+    })
+    // 组装交易信息
+    t := &web3.Transaction{
+        From:        sender,
+        To:          &receiver,
+        Value:       big.NewInt(100000000000000000),
+        Nonce:       nonce,
+        BlockNumber: uint64(block),
+        GasPrice:    gas,
+        Gas:         gasLimit,
+    }
+
+    chainId, _ := cli.Eth().ChainID()
+    signer := wallet.NewEIP155Signer(chainId.Uint64()) 
+    byteKey, _ := hex.DecodeString(private_hash) // 发起交易账户 私钥
+    key, _ := wallet.NewWalletFromPrivKey(byteKey)
+    data, err := signer.SignTx(t, key) // 签名数据
+    cli.Eth().SenSignTransaction(data) // 发起交易
+
+```
+
 - [关于事件监听](./event/event_test.go)

units.go

@@ -2,7 +2,7 @@
  * @Author: small_ant [email protected]
  * @Time: 2022-01-15 13:50:16
  * @LastAuthor: small_ant [email protected]
- * @lastTime: 2022-11-18 16:49:13
+ * @lastTime: 2022-12-08 14:14:42
  * @FileName: units
  * @Desc:
  *
@@ -11,11 +11,14 @@
 package web3
 
 import (
+	"fmt"
 	"math/big"
 	"strconv"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/crypto"
+
 	"github.com/shopspring/decimal"
 )
 
@@ -126,3 +129,47 @@ func ToWei(iamount interface{}, decimals int) *big.Int {
 
 	return wei
 }
+
+// It takes a byte array, and returns a byte array
+//
+// Args:
+//   buf ([]byte): The data to be hashed.
+//
+// Returns:
+//   The hash of the input buffer.
+func Keccak256(buf []byte) []byte {
+	return crypto.Keccak256(buf)
+}
+
+// It takes a byte array, converts it to a string, prepends a string to it, and then hashes the result
+//
+// Args:
+//   data ([]byte): The data to sign.
+//
+// Returns:
+//   The hash of the message.
+func SignHash(data []byte) []byte {
+	msg := fmt.Sprintf("\x19Ethereum Signed Message:\n%d%s", len(data), data)
+	return Keccak256([]byte(msg))
+}
+
+// It takes a string and returns a byte array
+//
+// Args:
+//   data (string): The data to sign.
+//
+// Returns:
+//   The return value is a byte array.
+func SignString(data string) []byte {
+	msg := fmt.Sprintf("\x19Ethereum Signed Message:\n%d", 32)
+	return []byte(msg)
+}
+
+// It takes a variable number of byte slices and returns a single byte slice
+// 
+// Returns:
+//   The hash of the data.
+func Keccak256HashData(data ...[]byte) []byte {
+	h := crypto.Keccak256Hash(data...)
+	return h.Bytes()
+}