ethereum-private-key-to-public-key/cli.js

Convert an Ethereum private key to a public key

const meow = require('meow')
const privateKeyToPublicKey = require('.')

const cli = meow(`
    Usage
      $ ethereum_private_key_to_public_key <private-key>

    Examples
      $ ethereum_private_key_to_public_key 4f3edf983ac636a65a842ce7c78d9aa706d3b113bce9c46f30d7d21715b23b1d
      04e68acfc0253a10620dff706b0a1b1f1f5833ea3beb3bde2250d5f271f3563606672ebc45e0b7ea2e816ecb70ca03137b1c9476eec63d4632e990020b7b6fba39
`, {
  flags: {}
})

let privateKey = cli.input[0]

if (process.stdin) {
  process.stdin.setEncoding('utf8')
  process.stdin.resume()
  let content = ''
  process.stdin.on('data', (buf) => {
    content += buf.toString()
  })
  setTimeout(() => {
    content = content.trim()

    if (content) {
      privateKey = content
    }

    run()
  }, 10)
} else {
  run()
}

function run() {
  if (!privateKey) {
    console.log('private key argument is required')
    process.exit(1)
  }

  console.log(privateKeyToPublicKey(privateKey).toString('hex'))
  process.exit(0)
}