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system/node_modules/ethers/src.ts/wallet/json-crowdsale.ts

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+/**
+ *  @_subsection: api/wallet:JSON Wallets  [json-wallets]
+ */
+
+import { CBC, pkcs7Strip } from "aes-js";
+
+import { getAddress } from "../address/index.js";
+import { pbkdf2 } from "../crypto/index.js";
+import { id } from "../hash/index.js";
+import { getBytes, assertArgument } from "../utils/index.js";
+
+import { getPassword, looseArrayify, spelunk } from "./utils.js";
+
+
+/**
+ *  The data stored within a JSON Crowdsale wallet is fairly
+ *  minimal.
+ */
+export type CrowdsaleAccount = {
+    privateKey: string;
+    address: string;
+}
+
+/**
+ *  Returns true if %%json%% is a valid JSON Crowdsale wallet.
+ */
+export function isCrowdsaleJson(json: string): boolean {
+    try {
+        const data = JSON.parse(json);
+        if (data.encseed) { return true; }
+    } catch (error) { }
+    return false;
+}
+
+// See: https://github.com/ethereum/pyethsaletool
+
+/**
+ *  Before Ethereum launched, it was necessary to create a wallet
+ *  format for backers to use, which would be used to receive ether
+ *  as a reward for contributing to the project.
+ *
+ *  The [[link-crowdsale]] format is now obsolete, but it is still
+ *  useful to support and the additional code is fairly trivial as
+ *  all the primitives required are used through core portions of
+ *  the library.
+ */
+export function decryptCrowdsaleJson(json: string, _password: string | Uint8Array): CrowdsaleAccount {
+    const data = JSON.parse(json);
+    const password = getPassword(_password);
+
+    // Ethereum Address
+    const address = getAddress(spelunk(data, "ethaddr:string!"));
+
+    // Encrypted Seed
+    const encseed = looseArrayify(spelunk(data, "encseed:string!"));
+    assertArgument(encseed && (encseed.length % 16) === 0, "invalid encseed", "json", json);
+
+    const key = getBytes(pbkdf2(password, password, 2000, 32, "sha256")).slice(0, 16);
+
+    const iv = encseed.slice(0, 16);
+    const encryptedSeed = encseed.slice(16);
+
+    // Decrypt the seed
+    const aesCbc = new CBC(key, iv);
+    const seed = pkcs7Strip(getBytes(aesCbc.decrypt(encryptedSeed)));
+
+    // 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]);
+    }
+
+    return { address, privateKey: id(seedHex) };
+}