# fetchWalletFromPrivateKey

## Description

The `fetchWalletfromPrivateKey` function generates a key pair (public key and private key) from a given private key. It makes use of the CasperClient library and the Ed25519 algorithm to generate the key pair.

## Parameters

| Name         | Type   | Description                                         |
| ------------ | ------ | --------------------------------------------------- |
| `privateKey` | string | The private key to be used to generate the key pair |
| `RPC_API`    | string | The RPC API to be used by the CasperClient          |

## Response

| Name      | Type   | Description                                                              |
| --------- | ------ | ------------------------------------------------------------------------ |
| `keyPair` | object | An object containing the generated public key and private key as buffers |

## Example Request and Response

### Prerequisites

Before making requests with NO.AI SDK, you must have it installed.

You can install NO.AI SDK using either **`npm`** or **`yarn`**. Use the following commands to install NO.AI SDK:

```sh
npm install @nest25/casper-lib
OR
yarn add @nest25/casper-lib
```

### Request

Here is an example of how to make a `fetchWalletfromPrivateKey` request using the NO.AI SDK:

````javascript
// import Nest25 Casper library
const { Casper } = require('@nest25/casper-lib');
// create a new Casper instance
const casper = new Casper();

// set testnet variables
const privateKey = 'your-private-key';
const RPC_API = 'https://rpc.testnet.casperlabs.io/rpc';

async function main() {
  // fetch wallet from private key
  let { keyPair } = await casper.fetchWalletfromPrivateKey(privateKey, RPC_API);
  console.log(keyPair);
}
// call main function
main();

```
````

### Response

```sh
  {
        keyPair: t {
          publicKey: t { isCLValue: true, data: [Uint8Array], tag: 1 },
          privateKey: Uint8Array(64) [
            136, 103,  79,  12,  53,  66, 163, 104,  97, 238, 253,
            201,  63, 217,  28, 226,   8,  28, 163, 193, 111, 158,
            233, 203, 206, 234, 204, 112,  91, 196, 214, 176,  58,
             21, 106,  80, 252,  98, 132, 186,  67, 106, 237, 234,
            249, 107,  85, 172,  26,  12,  87, 238, 159, 138,  70,
            191,  28, 101,  24, 175, 233, 178, 245, 108
          ],
          signatureAlgorithm: 'ed25519'
        }
      }
```

## Use Cases

* **Crypto Wallets:** The function can be used by crypto wallets to generate key pairs from private keys.
* **Blockchain Applications:** The function can be used by blockchain applications to interact with the Casper network and sign transactions with generated key pairs.

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