129 lines
2.7 KiB
JavaScript
129 lines
2.7 KiB
JavaScript
import {
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WordArray,
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Hasher,
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} from './core.js';
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// Reusable object
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const W = [];
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/**
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* SHA-1 hash algorithm.
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*/
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export class SHA1Algo extends Hasher {
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_doReset() {
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this._hash = new WordArray([
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0x67452301,
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0xefcdab89,
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0x98badcfe,
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0x10325476,
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0xc3d2e1f0,
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]);
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}
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_doProcessBlock(M, offset) {
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// Shortcut
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const H = this._hash.words;
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// Working variables
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let a = H[0];
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let b = H[1];
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let c = H[2];
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let d = H[3];
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let e = H[4];
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// Computation
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for (let i = 0; i < 80; i += 1) {
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if (i < 16) {
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W[i] = M[offset + i] | 0;
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} else {
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const n = W[i - 3] ^ W[i - 8] ^ W[i - 14] ^ W[i - 16];
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W[i] = (n << 1) | (n >>> 31);
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}
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let t = ((a << 5) | (a >>> 27)) + e + W[i];
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if (i < 20) {
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t += ((b & c) | (~b & d)) + 0x5a827999;
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} else if (i < 40) {
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t += (b ^ c ^ d) + 0x6ed9eba1;
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} else if (i < 60) {
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t += ((b & c) | (b & d) | (c & d)) - 0x70e44324;
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} else /* if (i < 80) */ {
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t += (b ^ c ^ d) - 0x359d3e2a;
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}
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e = d;
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d = c;
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c = (b << 30) | (b >>> 2);
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b = a;
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a = t;
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}
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// Intermediate hash value
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H[0] = (H[0] + a) | 0;
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H[1] = (H[1] + b) | 0;
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H[2] = (H[2] + c) | 0;
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H[3] = (H[3] + d) | 0;
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H[4] = (H[4] + e) | 0;
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}
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_doFinalize() {
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// Shortcuts
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const data = this._data;
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const dataWords = data.words;
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const nBitsTotal = this._nDataBytes * 8;
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const nBitsLeft = data.sigBytes * 8;
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// Add padding
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dataWords[nBitsLeft >>> 5] |= 0x80 << (24 - (nBitsLeft % 32));
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dataWords[(((nBitsLeft + 64) >>> 9) << 4) + 14] = Math.floor(nBitsTotal / 0x100000000);
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dataWords[(((nBitsLeft + 64) >>> 9) << 4) + 15] = nBitsTotal;
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data.sigBytes = dataWords.length * 4;
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// Hash final blocks
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this._process();
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// Return final computed hash
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return this._hash;
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}
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clone() {
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const clone = super.clone.call(this);
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clone._hash = this._hash.clone();
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return clone;
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}
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}
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/**
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* Shortcut function to the hasher's object interface.
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*
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* @param {WordArray|string} message The message to hash.
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*
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* @return {WordArray} The hash.
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*
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* @static
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*
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* @example
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*
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* var hash = CryptoJS.SHA1('message');
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* var hash = CryptoJS.SHA1(wordArray);
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*/
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export const SHA1 = Hasher._createHelper(SHA1Algo);
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/**
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* Shortcut function to the HMAC's object interface.
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*
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* @param {WordArray|string} message The message to hash.
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* @param {WordArray|string} key The secret key.
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*
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* @return {WordArray} The HMAC.
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*
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* @static
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*
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* @example
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*
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* var hmac = CryptoJS.HmacSHA1(message, key);
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*/
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export const HmacSHA1 = Hasher._createHmacHelper(SHA1Algo);
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