73 lines
2.4 KiB
JavaScript
73 lines
2.4 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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function f(s, x, y, z) {
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switch (s) {
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case 0:
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return (x & y) ^ (~x & z);
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case 1:
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return x ^ y ^ z;
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case 2:
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return (x & y) ^ (x & z) ^ (y & z);
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case 3:
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return x ^ y ^ z;
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}
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}
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function ROTL(x, n) {
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return (x << n) | (x >>> (32 - n));
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}
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function sha1(bytes) {
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const K = [0x5a827999, 0x6ed9eba1, 0x8f1bbcdc, 0xca62c1d6];
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const H = [0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476, 0xc3d2e1f0];
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const newBytes = new Uint8Array(bytes.length + 1);
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newBytes.set(bytes);
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newBytes[bytes.length] = 0x80;
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bytes = newBytes;
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const l = bytes.length / 4 + 2;
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const N = Math.ceil(l / 16);
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const M = new Array(N);
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for (let i = 0; i < N; ++i) {
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const arr = new Uint32Array(16);
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for (let j = 0; j < 16; ++j) {
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arr[j] =
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(bytes[i * 64 + j * 4] << 24) |
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(bytes[i * 64 + j * 4 + 1] << 16) |
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(bytes[i * 64 + j * 4 + 2] << 8) |
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bytes[i * 64 + j * 4 + 3];
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}
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M[i] = arr;
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}
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M[N - 1][14] = ((bytes.length - 1) * 8) / Math.pow(2, 32);
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M[N - 1][14] = Math.floor(M[N - 1][14]);
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M[N - 1][15] = ((bytes.length - 1) * 8) & 0xffffffff;
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for (let i = 0; i < N; ++i) {
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const W = new Uint32Array(80);
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for (let t = 0; t < 16; ++t) {
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W[t] = M[i][t];
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}
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for (let t = 16; t < 80; ++t) {
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W[t] = ROTL(W[t - 3] ^ W[t - 8] ^ W[t - 14] ^ W[t - 16], 1);
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}
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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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for (let t = 0; t < 80; ++t) {
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const s = Math.floor(t / 20);
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const T = (ROTL(a, 5) + f(s, b, c, d) + e + K[s] + W[t]) >>> 0;
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e = d;
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d = c;
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c = ROTL(b, 30) >>> 0;
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b = a;
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a = T;
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}
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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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return Uint8Array.of(H[0] >> 24, H[0] >> 16, H[0] >> 8, H[0], H[1] >> 24, H[1] >> 16, H[1] >> 8, H[1], H[2] >> 24, H[2] >> 16, H[2] >> 8, H[2], H[3] >> 24, H[3] >> 16, H[3] >> 8, H[3], H[4] >> 24, H[4] >> 16, H[4] >> 8, H[4]);
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}
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exports.default = sha1;
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