/**
 * Secure storage types and interfaces
 */
/** Result of a storage operation */
export type StorageResult<T> = {
    ok: true;
    value: T;
} | {
    ok: false;
    error: string;
};
/**
 * Secure storage adapter interface
 *
 * All implementations must provide atomic, encrypted storage
 * with platform-appropriate protection (Keychain, Keystore, etc.)
 */
export interface SecureStorageAdapter {
    /** Storage backend name for diagnostics */
    readonly name: string;
    /** Whether this adapter is available on current platform */
    readonly available: boolean;
    /**
     * Store a value securely
     * @param key - Storage key (will be hashed internally)
     * @param value - Value to store (will be encrypted)
     */
    set(key: string, value: string): Promise<StorageResult<void>>;
    /**
     * Retrieve a stored value
     * @param key - Storage key
     */
    get(key: string): Promise<StorageResult<string | null>>;
    /**
     * Delete a stored value
     * @param key - Storage key
     */
    delete(key: string): Promise<StorageResult<void>>;
    /**
     * Check if a key exists
     * @param key - Storage key
     */
    has(key: string): Promise<StorageResult<boolean>>;
    /**
     * List all keys (may not be available on all platforms)
     */
    keys?(): Promise<StorageResult<string[]>>;
    /**
     * Clear all stored values
     */
    clear?(): Promise<StorageResult<void>>;
}
/**
 * Simple secure storage interface (legacy compatibility)
 * Used by inbox-store and other packages
 */
export interface SecureStorage {
    getString(key: string): Promise<string | null>;
    setString(key: string, value: string): Promise<void>;
    delete(key: string): Promise<void>;
    remove(key: string): Promise<void>;
}
/**
 * Options for secure storage operations
 */
export interface SecureStorageOptions {
    /** Namespace prefix for keys */
    namespace?: string;
    /** Custom encryption key (derived from user credentials) */
    encryptionKey?: Uint8Array;
    /** Biometric protection level (mobile only) */
    biometric?: "none" | "optional" | "required";
    /** Accessibility (iOS only) */
    accessible?: "unlocked" | "always" | "passcode";
}
/**
 * Encrypted envelope format for web storage
 */
export interface EncryptedEnvelope {
    /** Version for future upgrades */
    v: 1;
    /** Algorithm identifier */
    alg: "xchacha20-poly1305";
    /** Base64-encoded nonce */
    n: string;
    /** Base64-encoded ciphertext */
    c: string;
    /** Key derivation salt (if using password) */
    s?: string;
}
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