import { BlockCipherModeAlgorithm } from './BlockCipherModeAlgorithm';
export declare class CBCDecryptor extends BlockCipherModeAlgorithm {
    _prevBlock: Array<number> | undefined;
    /**
     * Processes the data block at offset.
     *
     * @param words The data words to operate on.
     * @param offset The offset where the block starts.
     *
     * @example
     *
     *     mode.processBlock(data.words, offset);
     */
    processBlock(words: Array<number>, offset: number): void;
    xorBlock(words: Array<number>, offset: number, blockSize: number): void;
}