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Ethereum Geth Export Private Key

Ethereum Geth Export Private Key

Keythereum is a JavaScript tool to generate, import and export Ethereum keys. This provides a simple way to use the same account locally and in web wallets. It can be used for verifiable cold storage wallets.

Keythereum uses the same key derivation functions (PBKDF2-SHA256 or scrypt), symmetric ciphers (AES-128-CTR or AES-128-CBC), and message authentication codes as geth. You can export your generated key to file, copy it to your data directory’s keystore, and immediately start using it in your local Ethereum client.

Note: starting in version 0.5.0, keythereum’s encrypt and decrypt functions both return Buffers instead of strings. This is a breaking change for anyone using these functions directly!

To use keythereum in Node.js, just require it:

A minified, browserified file dist/keythereum.min.js is included for use in the browser. Including this file simply attaches the keythereum object to window :

Generate a new random private key (256 bit), as well as the salt (256 bit) used by the key derivation function, and the initialization vector (128 bit) used to AES-128-CTR encrypt the key. create is asynchronous if it is passed a callback function, and synchronous otherwise.

You will need to specify a password and (optionally) a key derivation function. If unspecified, PBKDF2-SHA256 will be used to derive the AES secret key.

The dump function is used to export key info to keystore «secret-storage» format. If a callback function is supplied as the sixth parameter to dump, it will run asynchronously:

dump creates an object and not a JSON string. In Node, the exportToFile method provides an easy way to export this formatted key object to file. It creates a JSON file in the keystore sub-directory, and uses geth’s current file-naming convention (ISO timestamp concatenated with the key’s derived Ethereum address).

After successful key export, you will see a message like:
Importing a key from geth’s keystore can only be done on Node. The JSON file is parsed into an object with the same structure as keyObject above.

This has been tested with version 3 and version 1, but not version 2, keys. (Please send me a version 2 keystore file if you have one, so I can test it!)

To recover the plaintext private key from the key object, use keythereum.recover . The private key is returned as a Buffer.

By default, keythereum uses 65536 hashing rounds in its key derivation functions, compared to the 262144 geth uses by default. (Keythereum’s JSON output files are still compatible with geth, however, since they tell geth how many rounds to use.) These values are user-editable: keythereum.constants.pbkdf2.c is the number of rounds for PBKDF2, and keythereum.constants.scrypt.n is the number of rounds for scrypt.

Unit tests are in the test directory, and can be run with mocha:

Откройте программу, затем кликите по значку бутерброда в верхней части экрана. Далее выбертие пункт меню Tools :

Где взять закрытый ключ эфириум кошелька

Понимание концепции закрытого ключа, открытого ключа и адреса в блокчейне Ethereum

Создаем собственный блокчейн на Ethereum

Account Management¶

How to Set Up a Private Ethereum Blockchain using Geth

§ As mentioned, we allocated some ether to this wallet in the genesis block via our genesis.json file. Let’s see if it worked:
You will see this new encrypted key appear in the keystore directory in the datadir for this node.

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