@syncfusion/ej2-pdf
Version:
Feature-rich JavaScript PDF library with built-in support for loading and manipulating PDF document.
68 lines (67 loc) • 2.23 kB
TypeScript
import { _PdfNativeAccumulatorSink, _PdfNativeHashInput } from '../digital-signature/signature/pdf-accumulator';
/**
* SHA-256 hash implementation used internally for PDF cryptography.
*
* @private
*/
export declare class _Sha256 {
/**
* Create a chunked conversion sink for incremental hashing.
*
* @private
* @param {_PdfNativeAccumulatorSink} outputSink - Sink that will receive the hash output.
* @returns {_PdfNativeHashInput} A `_PdfNativeHashInput` for feeding chunks.
*/
_startChunkedConversion(outputSink: _PdfNativeAccumulatorSink): _PdfNativeHashInput;
/**
* Rotate a 32 bit value right by `n` bits.
*
* @private
* @param {number} x - The 32 bit value to rotate.
* @param {number} n - The number of bits to rotate.
* @returns {number} The rotated 32-bit value.
*/
_rotateRight(x: number, n: number): number;
/**
* Upper case sigma function used in SHA-256.
*
* @private
* @param {number} x - The input 32-bit word.
* @returns {number} The transformed 32-bit word.
*/
_sigma(x: number): number;
/**
* Upper-case sigma prime function used in SHA-256.
*
* @private
* @param {number} x - The input 32-bit word.
* @returns {number} The transformed 32-bit word.
*/
_sigmaPrime(x: number): number;
/**
* Lower-case sigma function used in the message schedule.
*
* @private
* @param {number} x - The input 32-bit word.
* @returns {number} The transformed 32-bit word.
*/
_littleSigma(x: number): number;
/**
* Lower-case sigma prime function used in the message schedule.
*
* @private
* @param {number} x The input 32-bit word.
* @returns {number} The transformed 32-bit word.
*/
_littleSigmaPrime(x: number): number;
/**
* Compute the SHA-256 hash for a slice of bytes.
*
* @private
* @param {Uint8Array} data bytes.
* @param {number} offset into `data`.
* @param {number} length of bytes to hash.
* @returns {Uint8Array} The 32-byte SHA-256 digest as `Uint8Array`.
*/
_hash(data: Uint8Array, offset: number, length: number): Uint8Array;
}