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service: this.serviceName });\n\n // Placeholder for native implementation\n if (typeof global !== 'undefined' && (global as any).KeychainModule) {\n await (global as any).KeychainModule.setItem(this.serviceName, key, value);\n } else {\n throw new Error('Keychain not available on this platform');\n }\n }\n\n async getItem(key: string): Promise {\n if (typeof global !== 'undefined' && (global as any).KeychainModule) {\n return (global as any).KeychainModule.getItem(this.serviceName, key);\n }\n throw new Error('Keychain not available on this platform');\n }\n\n async removeItem(key: string): Promise {\n if (typeof global !== 'undefined' && (global as any).KeychainModule) {\n await (global as any).KeychainModule.removeItem(this.serviceName, key);\n } else {\n throw new Error('Keychain not available on this platform');\n }\n }\n\n async hasItem(key: string): Promise {\n const value = await this.getItem(key);\n return value !== null;\n }\n\n async clear(): Promise {\n if (typeof global 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.map((b) => b.toString(16).padStart(2, '0'))\n .join('');\n localStorage.setItem(saltKey, saltHex);\n }\n\n return new Uint8Array(\n saltHex.match(/.{1,2}/g)!.map((byte) => parseInt(byte, 16))\n );\n }\n\n async setItem(key: string, value: string): Promise {\n if (!this.encryptionKey) {\n throw new Error('Storage not initialized. Call initialize() first.');\n }\n\n const encoder = new TextEncoder();\n const iv = crypto.getRandomValues(new Uint8Array(12));\n\n const encrypted = await crypto.subtle.encrypt(\n { name: 'AES-GCM', iv },\n this.encryptionKey,\n encoder.encode(value)\n );\n\n const combined = new Uint8Array(iv.length + encrypted.byteLength);\n combined.set(iv);\n combined.set(new Uint8Array(encrypted), iv.length);\n\n const base64 = btoa(String.fromCharCode(...combined));\n localStorage.setItem(`${this.storagePrefix}${key}`, base64);\n }\n\n async getItem(key: string): Promise {\n if (!this.encryptionKey) {\n throw new Error('Storage not initialized. Call initialize() first.');\n }\n\n const base64 = localStorage.getItem(`${this.storagePrefix}${key}`);\n if (!base64) return null;\n\n try {\n const combined = new Uint8Array(\n atob(base64)\n .split('')\n .map((c) => c.charCodeAt(0))\n );\n\n const iv = combined.slice(0, 12);\n const encrypted = combined.slice(12);\n\n const decrypted = await crypto.subtle.decrypt(\n { name: 'AES-GCM', iv },\n this.encryptionKey,\n encrypted\n );\n\n const decoder = new TextDecoder();\n return decoder.decode(decrypted);\n } catch {\n return null;\n }\n }\n\n async removeItem(key: string): Promise {\n localStorage.removeItem(`${this.storagePrefix}${key}`);\n }\n\n async hasItem(key: string): Promise {\n return localStorage.getItem(`${this.storagePrefix}${key}`) !== null;\n }\n\n async clear(): Promise {\n const keysToRemove: string[] = [];\n\n for (let i = 0; i < localStorage.length; i++) {\n const key = localStorage.key(i);\n if (key?.startsWith(this.storagePrefix)) {\n keysToRemove.push(key);\n }\n }\n\n keysToRemove.forEach((key) => localStorage.removeItem(key));\n }\n}\n\n/**\n * In-Memory Storage Adapter (for testing)\n */\nexport class MemoryStorageAdapter implements SecureStorageAdapter {\n private storage: Map = new Map();\n\n async setItem(key: string, value: string): Promise {\n this.storage.set(key, value);\n }\n\n async getItem(key: string): Promise {\n return this.storage.get(key) || null;\n }\n\n async removeItem(key: string): Promise {\n this.storage.delete(key);\n }\n\n async hasItem(key: string): Promise {\n return this.storage.has(key);\n }\n\n async clear(): Promise {\n this.storage.clear();\n }\n}\n\n/**\n * Secure Storage Factory\n * Creates appropriate storage adapter based on platform\n */\nexport function createSecureStorage(): SecureStorageAdapter {\n // Check for React Native\n if (\n typeof global !== 'undefined' &&\n (global as any).nativeModuleProxy !== undefined\n ) {\n // Check platform\n const Platform = (global as any).Platform;\n if (Platform?.OS === 'ios') {\n return new KeychainStorageAdapter();\n } else if (Platform?.OS === 'android') {\n return new KeystoreStorageAdapter();\n }\n }\n\n // Check for browser environment\n if (typeof window !== 'undefined' && typeof localStorage !== 'undefined') {\n return new WebEncryptedStorageAdapter();\n }\n\n // Fallback to memory storage (for Node.js/testing)\n return new MemoryStorageAdapter();\n}\n","/**\n * KeyManager - Secure key storage and encryption\n *\n * Handles seed phrase encryption using AES-256-GCM\n * with PBKDF2 key derivation from user password.\n */\nexport class KeyManager {\n private static readonly ALGORITHM = 'AES-GCM';\n private static readonly KEY_LENGTH = 256;\n private static readonly IV_LENGTH = 12;\n private static readonly SALT_LENGTH = 16;\n private static readonly PBKDF2_ITERATIONS = 100000;\n\n /**\n * Encrypt a seed phrase with a password\n */\n static async encryptSeed(seed: string, password: string): Promise {\n const encoder = new TextEncoder();\n const seedData = encoder.encode(seed);\n\n // Generate random salt and IV\n const salt = crypto.getRandomValues(new Uint8Array(this.SALT_LENGTH));\n const iv = crypto.getRandomValues(new Uint8Array(this.IV_LENGTH));\n\n // Derive key from password\n const key = await this.deriveKey(password, salt);\n\n // Encrypt\n const encrypted = await crypto.subtle.encrypt(\n { name: this.ALGORITHM, iv },\n key,\n seedData\n );\n\n // Combine salt + iv + encrypted data\n const combined = new Uint8Array(salt.length + iv.length + encrypted.byteLength);\n combined.set(salt, 0);\n combined.set(iv, salt.length);\n combined.set(new Uint8Array(encrypted), salt.length + iv.length);\n\n // Return as base64\n return btoa(String.fromCharCode(...combined));\n }\n\n /**\n * Decrypt a seed phrase with a password\n */\n static async decryptSeed(encryptedData: string, password: string): Promise {\n // Decode from base64\n const combined = new Uint8Array(\n atob(encryptedData)\n .split('')\n .map(c => c.charCodeAt(0))\n );\n\n // Extract salt, iv, and encrypted data\n const salt = combined.slice(0, this.SALT_LENGTH);\n const iv = combined.slice(this.SALT_LENGTH, this.SALT_LENGTH + this.IV_LENGTH);\n const encrypted = combined.slice(this.SALT_LENGTH + this.IV_LENGTH);\n\n // Derive key from password\n const key = await this.deriveKey(password, salt);\n\n // Decrypt\n const decrypted = await crypto.subtle.decrypt(\n { name: this.ALGORITHM, iv },\n key,\n encrypted\n );\n\n const decoder = new TextDecoder();\n return decoder.decode(decrypted);\n }\n\n /**\n * Derive encryption key from password using PBKDF2\n */\n private static async deriveKey(\n password: string,\n salt: Uint8Array\n ): Promise {\n const encoder = new TextEncoder();\n const passwordData = encoder.encode(password);\n\n // Import password as key material\n const keyMaterial = await crypto.subtle.importKey(\n 'raw',\n passwordData,\n 'PBKDF2',\n false,\n ['deriveKey']\n );\n\n // Derive AES key\n return crypto.subtle.deriveKey(\n {\n name: 'PBKDF2',\n salt: salt.buffer.slice(salt.byteOffset, salt.byteOffset + salt.byteLength) as ArrayBuffer,\n iterations: this.PBKDF2_ITERATIONS,\n hash: 'SHA-256',\n },\n keyMaterial,\n { name: this.ALGORITHM, length: this.KEY_LENGTH },\n false,\n ['encrypt', 'decrypt']\n );\n }\n\n /**\n * Validate a BIP-39 seed phrase (basic validation)\n */\n static validateSeedPhrase(seed: string): boolean {\n const words = seed.trim().split(/\\s+/);\n // BIP-39 supports 12, 15, 18, 21, or 24 words\n const validWordCounts = [12, 15, 18, 21, 24];\n return validWordCounts.includes(words.length);\n }\n\n /**\n * Generate a random encryption key (for backup purposes)\n */\n static generateBackupKey(): string {\n const bytes = crypto.getRandomValues(new Uint8Array(32));\n return Array.from(bytes)\n .map(b => b.toString(16).padStart(2, '0'))\n .join('');\n }\n}\n","import { KeyManager } from '../security/KeyManager';\n\n/**\n * Backup metadata\n */\nexport interface BackupMetadata {\n version: number;\n createdAt: string;\n checksum: string;\n networks: string[];\n}\n\n/**\n * Encrypted backup payload\n */\nexport interface EncryptedBackup {\n metadata: BackupMetadata;\n encryptedSeed: string;\n salt: string;\n iv: string;\n}\n\n/**\n * Backup Service\n * Handles encrypted seed backup to S3 and recovery\n */\nexport class BackupService {\n private apiUrl: string;\n private accessToken: string;\n\n constructor(apiUrl: string, accessToken: string) {\n this.apiUrl = apiUrl;\n this.accessToken = accessToken;\n }\n\n /**\n * Export encrypted seed to S3\n */\n async exportSeedEncrypted(\n seed: string,\n password: string,\n networks: string[] = []\n ): Promise<{ backupId: string; checksum: string }> {\n // Encrypt the seed\n const encryptedSeed = await KeyManager.encryptSeed(seed, password);\n\n // Generate checksum for integrity verification\n const checksum = await this.generateChecksum(encryptedSeed);\n\n // Create backup payload\n const backup: EncryptedBackup = {\n metadata: {\n version: 1,\n createdAt: new Date().toISOString(),\n checksum,\n networks,\n },\n encryptedSeed,\n salt: this.extractSalt(encryptedSeed),\n iv: this.extractIV(encryptedSeed),\n };\n\n // Upload to API (which stores in S3)\n const response = await fetch(`${this.apiUrl}/backups`, {\n method: 'POST',\n headers: {\n 'Content-Type': 'application/json',\n Authorization: `Bearer ${this.accessToken}`,\n },\n body: JSON.stringify({ backup: JSON.stringify(backup) }),\n });\n\n if (!response.ok) {\n const error = await response.json();\n throw new Error(error.message || 'Failed to create backup');\n }\n\n const result = await response.json();\n\n return {\n backupId: result.backupId,\n checksum,\n };\n }\n\n /**\n * Import encrypted seed from S3\n */\n async importSeedEncrypted(password: string): Promise {\n // Fetch backup from API\n const response = await fetch(`${this.apiUrl}/backups/latest`, {\n headers: {\n Authorization: `Bearer ${this.accessToken}`,\n },\n });\n\n if (!response.ok) {\n if (response.status === 404) {\n throw new Error('No backup found');\n }\n const error = await response.json();\n throw new Error(error.message || 'Failed to fetch backup');\n }\n\n const result = await response.json();\n const backup: EncryptedBackup = JSON.parse(result.backup);\n\n // Verify integrity\n const checksum = await this.generateChecksum(backup.encryptedSeed);\n if (checksum !== backup.metadata.checksum) {\n throw new Error('Backup integrity check failed');\n }\n\n // Decrypt the seed\n const seed = await KeyManager.decryptSeed(backup.encryptedSeed, password);\n\n return seed;\n }\n\n /**\n * List all backups\n */\n async listBackups(): Promise {\n const response = await fetch(`${this.apiUrl}/backups`, {\n headers: {\n Authorization: `Bearer ${this.accessToken}`,\n },\n });\n\n if (!response.ok) {\n const error = await response.json();\n throw new Error(error.message || 'Failed to list backups');\n }\n\n const result = await response.json();\n return result.backups.map((b: any) => b.metadata);\n }\n\n /**\n * Delete a backup\n */\n async deleteBackup(backupId: string): Promise {\n const response = await fetch(`${this.apiUrl}/backups/${backupId}`, {\n method: 'DELETE',\n headers: {\n Authorization: `Bearer ${this.accessToken}`,\n },\n });\n\n if (!response.ok) {\n const error = await response.json();\n throw new Error(error.message || 'Failed to delete backup');\n }\n }\n\n /**\n * Verify backup can be decrypted\n */\n async verifyBackup(password: string): Promise {\n try {\n await this.importSeedEncrypted(password);\n return true;\n } catch {\n return false;\n }\n }\n\n /**\n * Generate SHA-256 checksum\n */\n private async generateChecksum(data: string): Promise {\n const encoder = new TextEncoder();\n const dataBuffer = encoder.encode(data);\n\n const hashBuffer = await crypto.subtle.digest('SHA-256', dataBuffer);\n const hashArray = Array.from(new Uint8Array(hashBuffer));\n\n return hashArray.map((b) => b.toString(16).padStart(2, '0')).join('');\n }\n\n /**\n * Extract salt from encrypted data (first 32 hex chars)\n */\n private extractSalt(encryptedData: string): string {\n return encryptedData.substring(0, 32);\n }\n\n /**\n * Extract IV from encrypted data (chars 32-56)\n */\n private extractIV(encryptedData: string): string {\n return encryptedData.substring(32, 56);\n }\n}\n\n/**\n * Backup routes handler (for API)\n */\nexport interface BackupRoutesConfig {\n s3Bucket: string;\n s3Prefix: string;\n}\n"]}