/**
 * XOR operations for BrightChain.
 *
 * All XOR operations in BrightChain use equal-length arrays for whitening/brightening.
 * This is NOT a repeating-key cipher - arrays must always be the same length.
 */
export declare class XorService {
    /**
     * XOR two Uint8Arrays of equal length.
     * For BrightChain whitening/brightening operations, we always XOR equal-length blocks.
     *
     * Properties:
     * - Self-inverse: (A ⊕ B) ⊕ B = A
     * - Commutative: A ⊕ B = B ⊕ A
     * - Associative: (A ⊕ B) ⊕ C = A ⊕ (B ⊕ C)
     *
     * @param a The first array to XOR.
     * @param b The second array to XOR (same length as a).
     * @returns A new Uint8Array containing the result of the XOR operation.
     * @throws Error if arrays have different lengths.
     */
    static xor(a: Uint8Array, b: Uint8Array): Uint8Array;
    /**
     * XOR multiple equal-length arrays together.
     * Used for brightening operations where a source block is XORed with multiple random blocks.
     *
     * @param arrays Array of Uint8Arrays to XOR together (all must be same length)
     * @returns A new Uint8Array containing the XOR of all input arrays
     * @throws Error if arrays have different lengths or if no arrays provided
     */
    static xorMultiple(arrays: Uint8Array[]): Uint8Array;
    /**
     * Generates a random key of a specified length.
     * @param length The length of the key in bytes.
     * @returns A Uint8Array containing the random key.
     * @throws Error if crypto API is not available.
     */
    static generateKey(length: number): Uint8Array;
    /**
     * Helper method to convert a string to a Uint8Array.
     * @param str The string to convert.
     * @returns A Uint8Array representation of the string.
     */
    static stringToBytes(str: string): Uint8Array;
    /**
     * Helper method to convert a Uint8Array to a string.
     * @param bytes The Uint8Array to convert.
     * @returns A string representation of the Uint8Array.
     */
    static bytesToString(bytes: Uint8Array): string;
}
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