Generate SSS shares from mnemonic words
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Ada
@@ -22,6 +22,14 @@ import AsyncStorage from '@react-native-async-storage/async-storage';
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import { colors, typography, spacing, borderRadius, shadows } from '../theme/colors';
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import { SystemStatus, KillSwitchLog } from '../types';
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import VaultScreen from './VaultScreen';
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import {
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SSSShare,
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mnemonicToEntropy,
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splitSecret,
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formatShareCompact,
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serializeShare,
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verifyShares,
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} from '../utils/sss';
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// Nautical-themed mnemonic word list (unique words only)
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const MNEMONIC_WORDS = [
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@@ -52,11 +60,39 @@ const generateMnemonic = (wordCount = 12) => {
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return words;
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};
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const splitMnemonic = (words: string[]) => [
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words.slice(0, 4),
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words.slice(4, 8),
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words.slice(8, 12),
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];
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/**
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* Generate SSS shares from mnemonic words
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* Uses Shamir's Secret Sharing (3,2) threshold scheme
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*/
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const generateSSSShares = (words: string[]): SSSShare[] => {
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try {
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// Convert mnemonic to entropy (big integer)
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const entropy = mnemonicToEntropy(words, MNEMONIC_WORDS);
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// Split entropy into 3 shares using SSS
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const shares = splitSecret(entropy);
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// Verify shares can recover the original (optional, for debugging)
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if (__DEV__) {
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const isValid = verifyShares(shares, entropy);
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if (!isValid) {
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console.warn('SSS verification failed!');
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} else {
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console.log('SSS shares verified successfully');
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}
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}
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return shares;
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} catch (error) {
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console.error('Failed to generate SSS shares:', error);
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// Fallback: return empty shares (should not happen in production)
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return [
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{ x: 1, y: BigInt(0), label: 'device' },
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{ x: 2, y: BigInt(0), label: 'cloud' },
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{ x: 3, y: BigInt(0), label: 'heir' },
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];
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}
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};
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// Icon names type for type safety
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type StatusIconName = 'checkmark-circle' | 'warning' | 'alert-circle';
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@@ -127,7 +163,7 @@ export default function SentinelScreen() {
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const [showVault, setShowVault] = useState(false);
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const [showMnemonic, setShowMnemonic] = useState(false);
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const [mnemonicWords, setMnemonicWords] = useState<string[]>([]);
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const [mnemonicParts, setMnemonicParts] = useState<string[][]>([]);
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const [sssShares, setSssShares] = useState<SSSShare[]>([]);
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const [showEmailForm, setShowEmailForm] = useState(false);
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const [emailAddress, setEmailAddress] = useState('');
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const [isCapturing, setIsCapturing] = useState(false);
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@@ -188,16 +224,20 @@ export default function SentinelScreen() {
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const openVaultWithMnemonic = () => {
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const words = generateMnemonic();
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const parts = splitMnemonic(words);
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const shares = generateSSSShares(words);
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setMnemonicWords(words);
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setMnemonicParts(parts);
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setSssShares(shares);
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setShowMnemonic(true);
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setShowVault(false);
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setShowEmailForm(false);
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setEmailAddress('');
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AsyncStorage.setItem('sentinel_mnemonic_part_local', parts[0].join(' ')).catch(() => {
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// Best-effort local store; UI remains available
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});
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// Store Share A (device share) locally
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if (shares[0]) {
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AsyncStorage.setItem('sentinel_share_device', serializeShare(shares[0])).catch(() => {
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// Best-effort local store; UI remains available
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});
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}
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};
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const handleScreenshot = async () => {
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@@ -515,7 +555,7 @@ export default function SentinelScreen() {
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<Text style={styles.mnemonicTitle}>12-Word Mnemonic</Text>
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</View>
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<Text style={styles.mnemonicSubtitle}>
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Your mnemonic is split into 3 parts (4/4/4). Part 1 is stored locally.
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Your seed is protected by SSS (3,2) threshold encryption. Any 2 shares can restore your vault.
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</Text>
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<View style={styles.mnemonicBlock}>
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<Text style={styles.mnemonicBlockText}>
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@@ -524,19 +564,25 @@ export default function SentinelScreen() {
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</View>
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<View style={styles.partGrid}>
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<View style={[styles.partCard, styles.partCardStored]}>
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<Text style={styles.partLabel}>PART 1 • LOCAL</Text>
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<Text style={styles.partValue}>{mnemonicParts[0]?.join(' ')}</Text>
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<Text style={styles.partLabel}>SHARE A • DEVICE</Text>
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<Text style={styles.partValue}>
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{sssShares[0] ? formatShareCompact(sssShares[0]) : '---'}
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</Text>
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<Text style={styles.partHint}>Stored on this device</Text>
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</View>
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<View style={styles.partCard}>
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<Text style={styles.partLabel}>PART 2 • CLOUD NODE</Text>
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<Text style={styles.partValue}>{mnemonicParts[1]?.join(' ')}</Text>
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<Text style={styles.partHint}>To be synced</Text>
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<Text style={styles.partLabel}>SHARE B • CLOUD</Text>
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<Text style={styles.partValue}>
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{sssShares[1] ? formatShareCompact(sssShares[1]) : '---'}
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</Text>
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<Text style={styles.partHint}>To be synced to Sentinel</Text>
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</View>
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<View style={styles.partCard}>
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<Text style={styles.partLabel}>PART 3 • HEIR</Text>
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<Text style={styles.partValue}>{mnemonicParts[2]?.join(' ')}</Text>
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<Text style={styles.partHint}>To be assigned</Text>
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<Text style={styles.partLabel}>SHARE C • HEIR</Text>
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<Text style={styles.partValue}>
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{sssShares[2] ? formatShareCompact(sssShares[2]) : '---'}
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</Text>
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<Text style={styles.partHint}>For your heir (2-of-3 required)</Text>
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</View>
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</View>
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<TouchableOpacity
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