/**
 * Represents a CRC (Cyclic Redundancy Check) value object used to verify data integrity.
 *
 * This class encapsulates the CRC value and provides utility methods for CRC calculation and validation.
 * It implements the CRC-16/CCITT-FALSE algorithm, which is commonly used in EMVCo QR codes.
 * The algorithm uses:
 *  - Initial value: 0xFFFF
 *  - Polynomial: 0x1021
 *  - No final XOR operation
 *
 * The calculated CRC is represented as a 4-character uppercase hexadecimal string.
 */
export declare class CRC {
    private readonly _value;
    /**
     * Constructs a CRC value object.
     *
     * @param value - A 4-character hexadecimal string representing the CRC.
     * @throws {Error} If the provided CRC does not match the required format.
     */
    constructor(value: string);
    /**
     * Returns the CRC value as a string.
     *
     * @returns The CRC value.
     */
    toString(): string;
    /**
     * Validates the format of a CRC string.
     *
     * @param value - The CRC string to validate.
     * @returns True if the string is a valid 4-character hexadecimal, false otherwise.
     */
    static isValidFormat(value: string): boolean;
    /**
     * Calculates the CRC-16/CCITT-FALSE for the given input string.
     *
     * This algorithm processes the input data byte by byte using the following parameters:
     * - Initial value: 0xFFFF
     * - Polynomial: 0x1021
     * - No final XOR operation
     *
     * @param data - The input data (as a string) over which to calculate the CRC.
     * @returns A 4-character uppercase hexadecimal string representing the calculated CRC.
     */
    static calculate(data: string): string;
    /**
     * Validates that the CRC of the provided data matches the stored CRC value.
     *
     * @param data - The data (as a string) over which to compute the CRC.
     * @returns True if the computed CRC matches the stored value; otherwise, false.
     */
    validate(data: string): boolean;
}