如何為私鑰生成緩衝區

我是乙太坊開發的初學者。我正在使用Web3 js 1.0建構一個簡單的節點 js 應用程序，將乙太幣從一個錢包發送到主網上的另一個錢包。

我在從私鑰創建緩衝區時遇到問題，不斷收到此錯誤-

錯誤：預期的私鑰是長度為 32 的 Uint8Array。

這是我的程式碼：

//Private keys
const key1 = "0xb7bxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";

//Generate Byte Buffer for key
const buffer1 = Buffer.from(key1, "hex");

const rawTx = {
 nonce: web3.utils.toHex(count),
 to: addTo,
 value: web3.utils.toHex(bal - 10000000000 * 21000),
 gasLimit: web3.utils.toHex(21000),
 gasPrice: web3.utils.toHex(10000000000),
};

const txn = new Tx(rawTx);
txn.sign(buffer1);

const serialTx = txn.serialize();
const raw = "0x" + serialTx.toString("hex");

web3.eth.sendSignedTransaction(raw).on("transactionHash", (txHash) => {
 console.log("transactionHash:", txHash);
});

我在某處讀到，您必須在將0x私鑰傳遞給 Buffer 方法之前將其從私鑰中刪除？這是真的嗎？

如果您將程式碼更改為此，它應該可以解決問題。

const buffer1 = Buffer.from(key1.substring(2,66), "hex");

嘗試使用以下程式碼：

public function transfer(
   privateKey: string,
   fromAccount: string,
   toAccount: string,
   amount: string
 ) {
   const privateKeyBUF = Buffer.from(privateKey, 'hex');
   const contract = new this.web3.eth.Contract(
     [FunctionsAbi],
     [ContractAddress],
     { from: fromAccount }
   );

   amount = this.web3.utils.toHex(this.web3.utils.toWei(amount));
   return from(this.web3.eth.getTransactionCount(fromAccount)).pipe(
     switchMap((count) => {
       const rawTransaction = {
         from: fromAccount,
         gasPrice: this.web3.utils.toHex(20 * 1e9),
         gasLimit: this.web3.utils.toHex(210000),
         to: [ContractAddress],
         value: 0x0,
         data: contract.methods.transfer(toAccount, amount).encodeABI(),
         nonce: this.web3.utils.toHex(count),
       };

       const transaction = new Tx(rawTransaction, { chain: 'chain' });
       transaction.sign(privateKeyBUF);

       return from(
         this.web3.eth.sendSignedTransaction(
           '0x' + transaction.serialize().toString('hex')
         )
       );
     }),

     map((transaction) => {
       return transaction;
     })
   );
 }

引用自：https://ethereum.stackexchange.com/questions/101941