How does JS-SDK call for a separate signature

Baixin.chain · October 18, 2020, 1:09pm

Hello, brothers
I now have a requirement, and the scenario looks like this
I generated a TX through the Golang SDK
Sign the TX through jS-SDK
Send the signature to the Golang SDK
The Golang SDK does node broadcasting

The whole process should be successful in theory, because I am not very familiar with JS-SDK and not very familiar with the syntax. Could you please tell me how JS-SDK can sign TX with the private key? Which method should be called?

Baixin.chain · October 19, 2020, 8:21am

@hanssv.chain

hanssv.chain · October 19, 2020, 8:24am

Sorry I don’t know anything about JS-SDK…

@bruteforce.chain maybe?

Baixin.chain · October 19, 2020, 8:25am

Haha, your reply is so quick, this question has been bothering me for several days.

Baixin.chain · October 19, 2020, 8:28am

Or you know the steps of signing or how to deal with the data, you can also tell me, I am studying

bruteforce.chain · October 19, 2020, 8:41am

github.com

aeternity/aepp-sdk-js/blob/e9a7a9e1012fb960f7e7bd47e829aecd80dc56a2/docs/api/account.md#module_@aeternity/aepp-sdk/es/account--Account+signTransaction

<a id="module_@aeternity/aepp-sdk/es/account"></a>

## @aeternity/aepp-sdk/es/account
Account module

**Example**  
```js
import Account from '@aeternity/aepp-sdk/es/account'
```

* [@aeternity/aepp-sdk/es/account](#module_@aeternity/aepp-sdk/es/account)
    * [Account([options])](#exp_module_@aeternity/aepp-sdk/es/account--Account) ⇒ `Object` ⏏
        * [.signTransaction(tx, opt)](#module_@aeternity/aepp-sdk/es/account--Account+signTransaction) ⇒ `String`
        * [.getNetworkId()](#module_@aeternity/aepp-sdk/es/account--Account+getNetworkId) ⇒ `String`
        * [.signMessage(message, opt)](#module_@aeternity/aepp-sdk/es/account--Account+signMessage) ⇒ `String`
        * [.verifyMessage(message, signature, opt)](#module_@aeternity/aepp-sdk/es/account--Account+verifyMessage) ⇒ `Boolean`
        * *[.sign(data)](#module_@aeternity/aepp-sdk/es/account--Account+sign) ⇒ `String`*
        * *[.address()](#module_@aeternity/aepp-sdk/es/account--Account+address) ⇒ `String`*

<a id="exp_module_@aeternity/aepp-sdk/es/account--Account"></a>

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github.com

aeternity/aepp-sdk-js/blob/2cb8cc28b0f504f0e8156ebbed2af5690f9102a8/es/account/index.js#L34-L51


      
          /**
           * Sign encoded transaction
           * @instance
           * @category async
           * @rtype (tx: String) => tx: Promise[String], throws: Error
           * @param {String} tx - Transaction to sign
           * @param {Object} opt - Options
           * @return {String} Signed transaction
           */
          async function signTransaction (tx, opt = { signHash: true }) {
            const networkId = this.getNetworkId(opt)
            const rlpBinaryTx = decodeBase64Check(assertedType(tx, 'tx'))
            // Prepend `NETWORK_ID` to begin of data binary
            const txWithNetworkId = Buffer.concat([Buffer.from(networkId), opt.signHash ? buildTxHash(rlpBinaryTx, { raw: true }) : rlpBinaryTx])
          
          
  const signatures = [await this.sign(txWithNetworkId, opt)]
            return buildTx({ encodedTx: rlpBinaryTx, signatures }, TX_TYPE.signed).tx
          }

Baixin.chain · October 21, 2020, 12:27am

think you , Solved my problem