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