git.iko.soy/bridge
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bridge/src/lib/keys.js
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1import BN from 'bn.js';
2import { Just, Nothing } from 'folktale/maybe';
4import * as noun from '../nockjs/noun';
5import * as serial from '../nockjs/serial';
6import * as kg from 'urbit-key-generation/dist';
8import { eqAddr, addHexPrefix } from './wallet';
10// the curve param for the network keys
11export const NETWORK_KEY_CURVE_PARAMETER = '42';
12// the current crypto suite version
13export const CRYPTO_SUITE_VERSION = 1;
15export const CURVE_ZERO_ADDR =
16 '0x0000000000000000000000000000000000000000000000000000000000000000';
18// ctsy joemfb
19const b64 = buf => {
20 let hex = buf.reverse().toString('hex');
21 let n = new BN(hex, 'hex');
22 let c = [];
23 while (1 === n.cmpn(0)) {
24 c.push(n.andln(0x3f));
25 n = n.shrn(6);
26 }
28 // prettier-ignore
29 const trans = j =>
30 10 > j
31 ? j + 48
32 : 36 > j
33 ? j + 87
34 : 62 > j
35 ? j + 29
36 : 62 === j
37 ? 45
38 : 126;
40 return (
41 '0w' +
42 c.reduce(
43 (a, b, i) =>
44 String.fromCharCode(trans(b)) + (i && 0 === i % 5 ? '.' : '') + a,
45 ''
46 )
47 );
48};
50const jam = seed => {
51 const hex = serial
52 .jam(seed)
53 .toString()
54 .slice(2);
55 const pad = hex.length % 2 === 0 ? hex : '0' + hex;
56 return Buffer.from(pad, 'hex').reverse();
57};
59// simple alias to avoid importing kg into component scope
60export const deriveNetworkKeys = seed => kg.deriveNetworkKeys(seed);
62/**
63 * @param {object} pair
64 * @param {number} point
65 * @param {number} revision
66 * @return {string}
67 */
68export const compileNetworkingKey = (pair, point, revision) => {
69 const bnsec = new BN(
70 pair.crypt.private + pair.auth.private + NETWORK_KEY_CURVE_PARAMETER,
71 'hex'
72 );
74 const sed = noun.dwim(
75 noun.Atom.fromInt(point),
76 noun.Atom.fromInt(revision),
77 noun.Atom.fromString(bnsec.toString()),
78 noun.Atom.yes
79 );
81 return b64(jam(sed));
82};
84/**
85 * @param {object} urbitWallet
86 * @param {number} revision
87 * @return {Promise<Maybe<string>>}
88 */
89export const deriveNetworkSeedFromUrbitWallet = async (
90 urbitWallet,
91 revision = 1
92) => {
93 return await deriveNetworkSeedFromSeed(urbitWallet.management.seed, revision);
94};
96/**
97 * @param {Maybe<any>} wallet
98 * @param {string} authMnemonic
99 * @param {object} details
100 * @param {number} revision
101 * @return {Promise<Maybe<string>>}
102 */
103export const deriveNetworkSeedFromMnemonic = async (
104 wallet,
105 authMnemonic,
106 details,
107 revision = 1
108) => {
109 const isManagementProxy = eqAddr(wallet.address, details.managementProxy);
111 // the network seed is derivable from mnemonic iff the management proxy
112 // is this mnemonic
113 if (isManagementProxy) {
114 return await deriveNetworkSeedFromSeed(authMnemonic, revision);
115 }
117 return Nothing();
118};
120/**
121 * @param {string} seed
122 * @param {number} revision
123 * @return {Promise<Maybe<string>>}
124 */
125const deriveNetworkSeedFromSeed = async (seed, revision) => {
126 return Just(await kg.deriveNetworkSeed(seed, '', revision));
127};
129/**
130 * @return {Promise<Maybe<string>>}
131 */
132export const attemptNetworkSeedDerivation = async ({
133 urbitWallet,
134 wallet,
135 authMnemonic,
136 details,
137 revision,
138}) => {
139 if (Just.hasInstance(urbitWallet)) {
140 return await deriveNetworkSeedFromUrbitWallet(urbitWallet.value, revision);
141 }
143 if (Just.hasInstance(wallet) && Just.hasInstance(authMnemonic)) {
144 return await deriveNetworkSeedFromMnemonic(
145 wallet.value,
146 authMnemonic.value,
147 details,
148 revision
149 );
150 }
152 return Nothing();
153};
155/**
156 *
157 * @param {object} pair
158 * @param {object} details
159 * @return {boolean}
160 */
161export const keysMatchChain = (pair, details) => {
162 const { crypt, auth } = pair;
163 const { encryptionKey, authenticationKey } = details;
165 return (
166 encryptionKey === addHexPrefix(crypt.public) &&
167 authenticationKey === addHexPrefix(auth.public)
168 );
169};
171export const segmentNetworkKey = hex => {
172 if (hex === CURVE_ZERO_ADDR) {
173 return null;
174 }
176 const sl = i => hex.slice(i, i + 4);
177 const rowFrom = i => `${sl(i)}.${sl(i + 4)}.${sl(i + 8)}.${sl(i + 12)}`;
179 return [rowFrom(2), rowFrom(18), rowFrom(34), rowFrom(50)];
180};