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keystore.js
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keystore.js
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import {fromEthSale, fromV1, fromV3, fromPrivateKey} from 'ethereumjs-wallet';
import {clearHexPrefix} from '../common/formatter';
/**
* Returns private key of given keystore
* @param keystore string
* @param password string
* @returns {Buffer}
*/
export function decryptKeystoreToPkey (keystore, password)
{
let wallet;
const parsed = JSON.parse(keystore);
switch (determineKeystoreType(keystore))
{
case 'presale':
wallet = decryptPresaleToPrivKey(keystore, password);
break;
case 'v1-unencrypted':
wallet = Buffer.from(parsed.private, 'hex');
break;
case 'v1-encrypted':
wallet = decryptMewV1ToPrivKey(keystore, password);
break;
case 'v2-unencrypted':
wallet = Buffer.from(parsed.privKey, 'hex');
break;
case 'v2-v3-utc':
wallet = decryptUtcKeystoreToPkey(keystore, password);
break;
default:
throw new Error('unrecognized type of keystore');
}
return wallet;
}
/**
* Returns keystore of a given ethereum private key with password
* @param privateKey
* @param password
* @returns {{version, id, address, crypto}} keystore
*/
export function pkeyToKeystore (privateKey, password)
{
return fromPrivateKey(privateKey).toV3(password, {c: 1024, n: 1024});
}
/**
* Returns ethereum private key of given v3 keystore
* @param keystore string
* @param password string
* @returns {Buffer}
*/
export function decryptUtcKeystoreToPkey (keystore, password)
{
return fromV3(keystore, password, true).getPrivateKey();
}
/**
* Returns type of a given keystore
* @param keystore string
* @returns {string}
*/
export function determineKeystoreType (keystore)
{
const parsed = JSON.parse(keystore);
if (parsed.encseed)
{
return 'presale';
}
else if (parsed.Crypto || parsed.crypto)
{
return 'v2-v3-utc';
}
else if (parsed.hash && parsed.locked === true)
{
return 'v1-encrypted';
}
else if (parsed.hash && parsed.locked === false)
{
return 'v1-unencrypted';
}
else if (parsed.publisher === 'MyEtherWallet')
{
return 'v2-unencrypted';
}
else
{
throw new Error('Invalid keystore');
}
}
/**
* Returns ethereum private key of given presale keystore
* @param keystore string
* @param password string
* @returns {Buffer}
*/
export function decryptPresaleToPrivKey (keystore, password)
{
return fromEthSale(keystore, password).getPrivateKey();
}
/**
* Returns ethereum private key of given v1 keystore
* @param keystore string
* @param password string
* @returns {Buffer}
*/
export function decryptMewV1ToPrivKey (keystore, password)
{
return fromV1(keystore, password).getPrivateKey();
}
/**
* Checks whether a password is required to decrypt the given keystore
* @param keystore string
* @returns {boolean}
*/
export function isKeystorePassRequired (keystore)
{
switch (determineKeystoreType(keystore))
{
case 'presale':
return true;
case 'v1-unencrypted':
return false;
case 'v1-encrypted':
return true;
case 'v2-unencrypted':
return false;
case 'v2-v3-utc':
return true;
default:
return false;
}
}
/**
* Returns V3 format fileName
* @param address
* @returns {string}
*/
export function getFileName (address)
{
const ts = new Date();
return ['UTC--', ts.toJSON().replace(/:/g, '-'), '--', clearHexPrefix(address), '.json'].join('');
}