export interface BlockSizeOptions {
    readonly max?: number;
}
export declare function assertBlockSize(blockSize: number, options?: BlockSizeOptions): void;
export declare function assertBlockMultiple(input: Uint8Array, blockSize: number, label: string): void;
export declare function assertPaddedInput(input: Uint8Array, blockSize: number, label: string, options?: BlockSizeOptions): void;
export declare function assertIv(blockSize: number, iv: Uint8Array | undefined, modeName: string): asserts iv is Uint8Array;
export declare function getBlockPaddingLength(inputLength: number, blockSize: number): number;
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