mirror of
https://github.com/mozilla/pdf.js.git
synced 2025-04-19 14:48:08 +02:00
Move the calculateMD5 function into its own file
This allows us to remove a closure, and we also change the code to initialize various constants lazily.
This commit is contained in:
Jonas Jenwald
parent
cef4fcf025
commit
3e8d01ad7c
5 changed files with 134 additions and 105 deletions
130
src/core/calculate_md5.js
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130
src/core/calculate_md5.js
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@ -0,0 +1,130 @@
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/* Copyright 2012 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import { shadow } from "../shared/util.js";
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const PARAMS = {
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get r() {
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return shadow(
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this,
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"r",
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new Uint8Array([
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7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 5, 9, 14,
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20, 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 4, 11, 16, 23, 4, 11, 16,
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23, 4, 11, 16, 23, 4, 11, 16, 23, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10,
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15, 21, 6, 10, 15, 21,
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])
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);
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},
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get k() {
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return shadow(
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this,
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"k",
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new Int32Array([
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-680876936, -389564586, 606105819, -1044525330, -176418897, 1200080426,
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-1473231341, -45705983, 1770035416, -1958414417, -42063, -1990404162,
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1804603682, -40341101, -1502002290, 1236535329, -165796510, -1069501632,
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643717713, -373897302, -701558691, 38016083, -660478335, -405537848,
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568446438, -1019803690, -187363961, 1163531501, -1444681467, -51403784,
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1735328473, -1926607734, -378558, -2022574463, 1839030562, -35309556,
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-1530992060, 1272893353, -155497632, -1094730640, 681279174, -358537222,
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-722521979, 76029189, -640364487, -421815835, 530742520, -995338651,
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-198630844, 1126891415, -1416354905, -57434055, 1700485571, -1894986606,
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-1051523, -2054922799, 1873313359, -30611744, -1560198380, 1309151649,
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-145523070, -1120210379, 718787259, -343485551,
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])
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);
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},
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};
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function calculateMD5(data, offset, length) {
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let h0 = 1732584193,
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h1 = -271733879,
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h2 = -1732584194,
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h3 = 271733878;
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// pre-processing
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const paddedLength = (length + 72) & ~63; // data + 9 extra bytes
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const padded = new Uint8Array(paddedLength);
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let i, j;
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for (i = 0; i < length; ++i) {
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padded[i] = data[offset++];
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}
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padded[i++] = 0x80;
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const n = paddedLength - 8;
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while (i < n) {
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padded[i++] = 0;
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}
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padded[i++] = (length << 3) & 0xff;
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padded[i++] = (length >> 5) & 0xff;
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padded[i++] = (length >> 13) & 0xff;
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padded[i++] = (length >> 21) & 0xff;
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padded[i++] = (length >>> 29) & 0xff;
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padded[i++] = 0;
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padded[i++] = 0;
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padded[i++] = 0;
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const w = new Int32Array(16);
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const { k, r } = PARAMS;
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for (i = 0; i < paddedLength; ) {
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for (j = 0; j < 16; ++j, i += 4) {
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w[j] =
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padded[i] |
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(padded[i + 1] << 8) |
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(padded[i + 2] << 16) |
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(padded[i + 3] << 24);
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}
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let a = h0,
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b = h1,
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c = h2,
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d = h3,
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f,
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g;
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for (j = 0; j < 64; ++j) {
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if (j < 16) {
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f = (b & c) | (~b & d);
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g = j;
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} else if (j < 32) {
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f = (d & b) | (~d & c);
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g = (5 * j + 1) & 15;
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} else if (j < 48) {
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f = b ^ c ^ d;
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g = (3 * j + 5) & 15;
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} else {
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f = c ^ (b | ~d);
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g = (7 * j) & 15;
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}
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const tmp = d,
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rotateArg = (a + f + k[j] + w[g]) | 0,
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rotate = r[j];
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d = c;
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c = b;
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b = (b + ((rotateArg << rotate) | (rotateArg >>> (32 - rotate)))) | 0;
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a = tmp;
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}
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h0 = (h0 + a) | 0;
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h1 = (h1 + b) | 0;
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h2 = (h2 + c) | 0;
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h3 = (h3 + d) | 0;
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}
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// prettier-ignore
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return new Uint8Array([
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h0 & 0xFF, (h0 >> 8) & 0xFF, (h0 >> 16) & 0xFF, (h0 >>> 24) & 0xFF,
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h1 & 0xFF, (h1 >> 8) & 0xFF, (h1 >> 16) & 0xFF, (h1 >>> 24) & 0xFF,
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h2 & 0xFF, (h2 >> 8) & 0xFF, (h2 >> 16) & 0xFF, (h2 >>> 24) & 0xFF,
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h3 & 0xFF, (h3 >> 8) & 0xFF, (h3 >> 16) & 0xFF, (h3 >>> 24) & 0xFF
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]);
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}
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export { calculateMD5 };
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@ -25,6 +25,7 @@ import {
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warn,
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} from "../shared/util.js";
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import { Dict, isName, Name } from "./primitives.js";
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import { calculateMD5 } from "./calculate_md5.js";
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import { DecryptStream } from "./decrypt_stream.js";
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class ARCFourCipher {
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@ -75,107 +76,6 @@ class ARCFourCipher {
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}
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}
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const calculateMD5 = (function calculateMD5Closure() {
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const r = new Uint8Array([
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7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 5, 9, 14, 20, 5,
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9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11,
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16, 23, 4, 11, 16, 23, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10,
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15, 21,
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]);
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const k = new Int32Array([
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-680876936, -389564586, 606105819, -1044525330, -176418897, 1200080426,
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-1473231341, -45705983, 1770035416, -1958414417, -42063, -1990404162,
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1804603682, -40341101, -1502002290, 1236535329, -165796510, -1069501632,
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643717713, -373897302, -701558691, 38016083, -660478335, -405537848,
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568446438, -1019803690, -187363961, 1163531501, -1444681467, -51403784,
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1735328473, -1926607734, -378558, -2022574463, 1839030562, -35309556,
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-1530992060, 1272893353, -155497632, -1094730640, 681279174, -358537222,
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-722521979, 76029189, -640364487, -421815835, 530742520, -995338651,
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-198630844, 1126891415, -1416354905, -57434055, 1700485571, -1894986606,
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-1051523, -2054922799, 1873313359, -30611744, -1560198380, 1309151649,
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-145523070, -1120210379, 718787259, -343485551,
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]);
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function hash(data, offset, length) {
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let h0 = 1732584193,
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h1 = -271733879,
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h2 = -1732584194,
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h3 = 271733878;
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// pre-processing
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const paddedLength = (length + 72) & ~63; // data + 9 extra bytes
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const padded = new Uint8Array(paddedLength);
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let i, j;
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for (i = 0; i < length; ++i) {
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padded[i] = data[offset++];
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}
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padded[i++] = 0x80;
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const n = paddedLength - 8;
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while (i < n) {
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padded[i++] = 0;
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}
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padded[i++] = (length << 3) & 0xff;
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padded[i++] = (length >> 5) & 0xff;
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padded[i++] = (length >> 13) & 0xff;
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padded[i++] = (length >> 21) & 0xff;
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padded[i++] = (length >>> 29) & 0xff;
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padded[i++] = 0;
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padded[i++] = 0;
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padded[i++] = 0;
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const w = new Int32Array(16);
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for (i = 0; i < paddedLength; ) {
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for (j = 0; j < 16; ++j, i += 4) {
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w[j] =
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padded[i] |
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(padded[i + 1] << 8) |
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(padded[i + 2] << 16) |
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(padded[i + 3] << 24);
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}
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let a = h0,
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b = h1,
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c = h2,
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d = h3,
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f,
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g;
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for (j = 0; j < 64; ++j) {
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if (j < 16) {
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f = (b & c) | (~b & d);
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g = j;
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} else if (j < 32) {
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f = (d & b) | (~d & c);
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g = (5 * j + 1) & 15;
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} else if (j < 48) {
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f = b ^ c ^ d;
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g = (3 * j + 5) & 15;
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} else {
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f = c ^ (b | ~d);
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g = (7 * j) & 15;
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}
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const tmp = d,
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rotateArg = (a + f + k[j] + w[g]) | 0,
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rotate = r[j];
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d = c;
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c = b;
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b = (b + ((rotateArg << rotate) | (rotateArg >>> (32 - rotate)))) | 0;
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a = tmp;
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}
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h0 = (h0 + a) | 0;
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h1 = (h1 + b) | 0;
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h2 = (h2 + c) | 0;
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h3 = (h3 + d) | 0;
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}
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// prettier-ignore
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return new Uint8Array([
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h0 & 0xFF, (h0 >> 8) & 0xFF, (h0 >> 16) & 0xFF, (h0 >>> 24) & 0xFF,
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h1 & 0xFF, (h1 >> 8) & 0xFF, (h1 >> 16) & 0xFF, (h1 >>> 24) & 0xFF,
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h2 & 0xFF, (h2 >> 8) & 0xFF, (h2 >> 16) & 0xFF, (h2 >>> 24) & 0xFF,
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h3 & 0xFF, (h3 >> 8) & 0xFF, (h3 >> 16) & 0xFF, (h3 >>> 24) & 0xFF
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]);
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}
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return hash;
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})();
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class Word64 {
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constructor(highInteger, lowInteger) {
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this.high = highInteger | 0;
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@ -1849,7 +1749,6 @@ export {
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AES128Cipher,
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AES256Cipher,
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ARCFourCipher,
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calculateMD5,
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calculateSHA256,
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calculateSHA384,
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calculateSHA512,
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@ -60,7 +60,7 @@ import {
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} from "./primitives.js";
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import { getXfaFontDict, getXfaFontName } from "./xfa_fonts.js";
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import { BaseStream } from "./base_stream.js";
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import { calculateMD5 } from "./crypto.js";
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import { calculateMD5 } from "./calculate_md5.js";
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import { Catalog } from "./catalog.js";
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import { clearGlobalCaches } from "./cleanup_helper.js";
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import { DatasetReader } from "./dataset_reader.js";
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@ -25,7 +25,7 @@ import {
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import { SimpleDOMNode, SimpleXMLParser } from "./xml_parser.js";
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import { Stream, StringStream } from "./stream.js";
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import { BaseStream } from "./base_stream.js";
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import { calculateMD5 } from "./crypto.js";
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import { calculateMD5 } from "./calculate_md5.js";
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async function writeObject(ref, obj, buffer, { encrypt = null }) {
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const transform = encrypt?.createCipherTransform(ref.num, ref.gen);
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@ -17,7 +17,6 @@ import {
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AES128Cipher,
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AES256Cipher,
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ARCFourCipher,
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calculateMD5,
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calculateSHA256,
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calculateSHA384,
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calculateSHA512,
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@ -31,6 +30,7 @@ import {
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PasswordResponses,
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stringToBytes,
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} from "../../src/shared/util.js";
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import { calculateMD5 } from "../../src/core/calculate_md5.js";
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describe("crypto", function () {
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function hex2binary(s) {
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