223 lines
7.7 KiB
JavaScript
223 lines
7.7 KiB
JavaScript
/* eslint-disable no-redeclare */
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/* eslint-disable no-multi-assign */
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/* eslint-disable no-param-reassign */
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/* eslint-disable no-return-assign */
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/* eslint-disable no-new-wrappers */
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/* eslint-disable @typescript-eslint/no-unused-vars */
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/* eslint-disable no-var */
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/* eslint-disable no-plusplus */
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/* eslint-disable prefer-destructuring */
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/* eslint-disable @typescript-eslint/naming-convention */
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/* eslint-disable block-scoped-var */
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/* eslint-disable vars-on-top */
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/* eslint-disable no-bitwise */
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/* eslint-disable no-cond-assign */
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/*
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* A JavaScript implementation of the SHA256 hash function.
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*
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* FILE: sha256.js
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* VERSION: 0.8
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* AUTHOR: Christoph Bichlmeier <informatik@zombiearena.de>
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*
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* NOTE: This version is not tested thoroughly!
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*
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* Copyright (c) 2003, Christoph Bichlmeier
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* ======================================================================
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ''AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* SHA256 logical functions */
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function rotateRight(n, x) {
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return x >>> n | x << 32 - n;
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}
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function choice(x, y, z) {
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return x & y ^ ~x & z;
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}
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function majority(x, y, z) {
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return x & y ^ x & z ^ y & z;
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}
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function sha256_Sigma0(x) {
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return rotateRight(2, x) ^ rotateRight(13, x) ^ rotateRight(22, x);
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}
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function sha256_Sigma1(x) {
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return rotateRight(6, x) ^ rotateRight(11, x) ^ rotateRight(25, x);
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}
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function sha256_sigma0(x) {
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return rotateRight(7, x) ^ rotateRight(18, x) ^ x >>> 3;
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}
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function sha256_sigma1(x) {
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return rotateRight(17, x) ^ rotateRight(19, x) ^ x >>> 10;
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}
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function sha256_expand(W, j) {
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return W[j & 0x0f] += sha256_sigma1(W[j + 14 & 0x0f]) + W[j + 9 & 0x0f] + sha256_sigma0(W[j + 1 & 0x0f]);
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}
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/* Hash constant words K: */
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var K256 = [0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2];
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/* global arrays */
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var ihash;
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var count;
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var buffer;
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var sha256_hex_digits = '0123456789abcdef';
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/* Add 32-bit integers with 16-bit operations (bug in some JS-interpreters:
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overflow) */
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function safe_add(x, y) {
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var lsw = (x & 0xffff) + (y & 0xffff);
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var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
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return msw << 16 | lsw & 0xffff;
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}
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/* Initialise the SHA256 computation */
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function sha256_init() {
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ihash = new Array(8);
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count = new Array(2);
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buffer = new Array(64);
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count[0] = count[1] = 0;
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ihash[0] = 0x6a09e667;
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ihash[1] = 0xbb67ae85;
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ihash[2] = 0x3c6ef372;
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ihash[3] = 0xa54ff53a;
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ihash[4] = 0x510e527f;
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ihash[5] = 0x9b05688c;
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ihash[6] = 0x1f83d9ab;
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ihash[7] = 0x5be0cd19;
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}
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/* Transform a 512-bit message block */
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function sha256_transform() {
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var a;
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var b;
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var c;
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var d;
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var e;
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var f;
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var g;
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var h;
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var T1;
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var T2;
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var W = new Array(16);
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/* Initialize registers with the previous intermediate value */
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a = ihash[0];
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b = ihash[1];
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c = ihash[2];
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d = ihash[3];
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e = ihash[4];
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f = ihash[5];
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g = ihash[6];
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h = ihash[7];
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/* make 32-bit words */
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for (var i = 0; i < 16; i++) W[i] = buffer[(i << 2) + 3] | buffer[(i << 2) + 2] << 8 | buffer[(i << 2) + 1] << 16 | buffer[i << 2] << 24;
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for (var j = 0; j < 64; j++) {
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T1 = h + sha256_Sigma1(e) + choice(e, f, g) + K256[j];
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if (j < 16) T1 += W[j];else T1 += sha256_expand(W, j);
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T2 = sha256_Sigma0(a) + majority(a, b, c);
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h = g;
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g = f;
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f = e;
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e = safe_add(d, T1);
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d = c;
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c = b;
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b = a;
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a = safe_add(T1, T2);
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}
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/* Compute the current intermediate hash value */
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ihash[0] += a;
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ihash[1] += b;
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ihash[2] += c;
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ihash[3] += d;
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ihash[4] += e;
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ihash[5] += f;
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ihash[6] += g;
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ihash[7] += h;
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}
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/* Read the next chunk of data and update the SHA256 computation */
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function sha256_update(data, inputLen) {
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var i;
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var index;
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var curpos = 0;
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/* Compute number of bytes mod 64 */
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index = count[0] >> 3 & 0x3f;
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var remainder = inputLen & 0x3f;
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/* Update number of bits */
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if ((count[0] += inputLen << 3) < inputLen << 3) count[1]++;
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count[1] += inputLen >> 29;
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/* Transform as many times as possible */
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for (i = 0; i + 63 < inputLen; i += 64) {
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for (var j = index; j < 64; j++) buffer[j] = data.charCodeAt(curpos++);
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sha256_transform();
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index = 0;
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}
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/* Buffer remaining input */
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for (var _j = 0; _j < remainder; _j++) buffer[_j] = data.charCodeAt(curpos++);
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}
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/* Finish the computation by operations such as padding */
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function sha256_final() {
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var index = count[0] >> 3 & 0x3f;
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buffer[index++] = 0x80;
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if (index <= 56) {
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for (var i = index; i < 56; i++) buffer[i] = 0;
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} else {
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for (var _i = index; _i < 64; _i++) buffer[_i] = 0;
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sha256_transform();
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for (var _i2 = 0; _i2 < 56; _i2++) buffer[_i2] = 0;
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}
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buffer[56] = count[1] >>> 24 & 0xff;
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buffer[57] = count[1] >>> 16 & 0xff;
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buffer[58] = count[1] >>> 8 & 0xff;
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buffer[59] = count[1] & 0xff;
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buffer[60] = count[0] >>> 24 & 0xff;
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buffer[61] = count[0] >>> 16 & 0xff;
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buffer[62] = count[0] >>> 8 & 0xff;
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buffer[63] = count[0] & 0xff;
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sha256_transform();
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}
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/* Split the internal hash values into an array of bytes */
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function sha256_encode_bytes() {
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var j = 0;
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var output = new Array(32);
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for (var i = 0; i < 8; i++) {
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output[j++] = ihash[i] >>> 24 & 0xff;
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output[j++] = ihash[i] >>> 16 & 0xff;
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output[j++] = ihash[i] >>> 8 & 0xff;
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output[j++] = ihash[i] & 0xff;
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}
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return output;
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}
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/* Get the internal hash as a hex string */
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function sha256_encode_hex() {
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var output = new String();
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for (var i = 0; i < 8; i++) {
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for (var j = 28; j >= 0; j -= 4) output += sha256_hex_digits.charAt(ihash[i] >>> j & 0x0f);
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}
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return output;
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}
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/* Main function: returns a hex string representing the SHA256 value of the
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given data */
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function digest(data) {
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sha256_init();
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sha256_update(data, data.length);
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sha256_final();
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return sha256_encode_hex();
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}
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export default digest; |