ethers.js/packages/json-wallets/src.ts/crowdsale.ts

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"use strict";
import aes from "aes-js";
import { ExternallyOwnedAccount } from "@ethersproject/abstract-signer";
import { getAddress } from "@ethersproject/address";
import { arrayify, Bytes } from "@ethersproject/bytes";
import { keccak256 } from "@ethersproject/keccak256";
import { pbkdf2 } from "@ethersproject/pbkdf2";
import { toUtf8Bytes } from "@ethersproject/strings";
import { Description } from "@ethersproject/properties";
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import { Logger } from "@ethersproject/logger";
import { version } from "./_version";
const logger = new Logger(version);
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import { getPassword, looseArrayify, searchPath } from "./utils";
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export interface _CrowdsaleAccount {
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address: string;
privateKey: string;
_isCrowdsaleAccount: boolean;
}
export class CrowdsaleAccount extends Description<_CrowdsaleAccount> implements ExternallyOwnedAccount {
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readonly address: string;
readonly privateKey: string;
readonly mnemonic?: string;
readonly path?: string;
readonly _isCrowdsaleAccount: boolean;
isCrowdsaleAccount(value: any): value is CrowdsaleAccount {
return !!(value && value._isCrowdsaleAccount);
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}
}
// See: https://github.com/ethereum/pyethsaletool
export function decrypt(json: string, password: Bytes | string): ExternallyOwnedAccount {
const data = JSON.parse(json);
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password = getPassword(password);
// Ethereum Address
const ethaddr = getAddress(searchPath(data, "ethaddr"));
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// Encrypted Seed
const encseed = looseArrayify(searchPath(data, "encseed"));
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if (!encseed || (encseed.length % 16) !== 0) {
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logger.throwArgumentError("invalid encseed", "json", json);
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}
const key = arrayify(pbkdf2(password, password, 2000, 32, "sha256")).slice(0, 16);
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const iv = encseed.slice(0, 16);
const encryptedSeed = encseed.slice(16);
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// Decrypt the seed
const aesCbc = new aes.ModeOfOperation.cbc(key, iv);
const seed = aes.padding.pkcs7.strip(arrayify(aesCbc.decrypt(encryptedSeed)));
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// This wallet format is weird... Convert the binary encoded hex to a string.
let seedHex = "";
for (let i = 0; i < seed.length; i++) {
seedHex += String.fromCharCode(seed[i]);
}
const seedHexBytes = toUtf8Bytes(seedHex);
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const privateKey = keccak256(seedHexBytes);
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return new CrowdsaleAccount ({
_isCrowdsaleAccount: true,
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address: ethaddr,
privateKey: privateKey
});
}