/**
 * Encrypted data structure with all parameters needed for decryption
 */
export interface EncryptedData {
    ciphertext: string;
    iv: string;
    authTag: string;
    salt: string;
    scryptParams: {
        N: number;
        r: number;
        p: number;
        keyLen: number;
    };
    version: number;
}
/**
 * Encrypt plaintext with password using AES-256-GCM
 */
export declare function encrypt(plaintext: string, password: string): Promise<EncryptedData>;
/**
 * Decrypt ciphertext with password using AES-256-GCM
 */
export declare function decrypt(encrypted: EncryptedData, password: string): Promise<string>;
/**
 * Generate cryptographically secure random bytes
 */
export declare function randomBytes(length: number): Buffer;
/**
 * Generate a random UUID for wallet IDs
 */
export declare function generateWalletId(): string;
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