declare function resolveEncryptionKey(): Buffer | null;
declare function isFieldEncryptionEnabled(): boolean;
declare function encryptField(plaintext: string, key: Buffer): string;
declare function decryptField(value: string, key: Buffer): string;
declare function hashLookupValue(normalizedValue: string, key: Buffer): string;
declare function normalizeEmail(email: string): string;
declare function protectEmail(email: string): {
    storedEmail: string;
    emailLookup: string;
};
declare function revealEmail(storedEmail: string): string;
declare function emailLookupForQuery(email: string): string;
export { decryptField, emailLookupForQuery, encryptField, hashLookupValue, isFieldEncryptionEnabled, normalizeEmail, protectEmail, resolveEncryptionKey, revealEmail, };