blockchainethereumsmart-contractssoliditytutorialdappweb3ethtruffleweb3jstransactionsigntransactionsignaturesign-datasignpublickeyprivatekeyethereum-identityencryptioncipher
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40 lines
1.4 KiB
40 lines
1.4 KiB
import { utils as ethersUtils, Wallet } from 'ethers';
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import { stripHexPrefix } from 'ethereumjs-util';
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var MIN_ENTROPY_SIZE = 128;
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var keccak256 = ethersUtils.keccak256;
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/**
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* create a privateKey from the given entropy or a new one
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* @param {Buffer} entropy
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* @return {string}
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*/
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export function createPrivateKey(entropy) {
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if (entropy) {
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if (!Buffer.isBuffer(entropy)) throw new Error('EthCrypto.createPrivateKey(): given entropy is no Buffer');
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if (Buffer.byteLength(entropy, 'utf8') < MIN_ENTROPY_SIZE) throw new Error('EthCrypto.createPrivateKey(): Entropy-size must be at least ' + MIN_ENTROPY_SIZE);
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var outerHex = keccak256(entropy);
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return outerHex;
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} else {
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var innerHex = keccak256(ethersUtils.concat([ethersUtils.randomBytes(32), ethersUtils.randomBytes(32)]));
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var middleHex = ethersUtils.concat([ethersUtils.concat([ethersUtils.randomBytes(32), innerHex]), ethersUtils.randomBytes(32)]);
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var _outerHex = keccak256(middleHex);
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return _outerHex;
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}
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}
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/**
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* creates a new object with
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* private-, public-Key and address
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* @param {Buffer?} entropy if provided, will use that as single random-source
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*/
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export function createIdentity(entropy) {
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var privateKey = createPrivateKey(entropy);
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var wallet = new Wallet(privateKey);
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var identity = {
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privateKey: privateKey,
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// remove trailing '0x04'
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publicKey: stripHexPrefix(wallet.publicKey).slice(2),
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address: wallet.address
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};
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return identity;
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} |