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278 lines
6.4 KiB
278 lines
6.4 KiB
'use strict';
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var assert = require('minimalistic-assert');
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var inherits = require('inherits');
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exports.inherits = inherits;
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function isSurrogatePair(msg, i) {
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if ((msg.charCodeAt(i) & 0xFC00) !== 0xD800) {
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return false;
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}
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if (i < 0 || i + 1 >= msg.length) {
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return false;
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}
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return (msg.charCodeAt(i + 1) & 0xFC00) === 0xDC00;
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}
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function toArray(msg, enc) {
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if (Array.isArray(msg))
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return msg.slice();
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if (!msg)
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return [];
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var res = [];
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if (typeof msg === 'string') {
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if (!enc) {
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// Inspired by stringToUtf8ByteArray() in closure-library by Google
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// https://github.com/google/closure-library/blob/8598d87242af59aac233270742c8984e2b2bdbe0/closure/goog/crypt/crypt.js#L117-L143
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// Apache License 2.0
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// https://github.com/google/closure-library/blob/master/LICENSE
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var p = 0;
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for (var i = 0; i < msg.length; i++) {
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var c = msg.charCodeAt(i);
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if (c < 128) {
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res[p++] = c;
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} else if (c < 2048) {
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res[p++] = (c >> 6) | 192;
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res[p++] = (c & 63) | 128;
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} else if (isSurrogatePair(msg, i)) {
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c = 0x10000 + ((c & 0x03FF) << 10) + (msg.charCodeAt(++i) & 0x03FF);
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res[p++] = (c >> 18) | 240;
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res[p++] = ((c >> 12) & 63) | 128;
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res[p++] = ((c >> 6) & 63) | 128;
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res[p++] = (c & 63) | 128;
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} else {
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res[p++] = (c >> 12) | 224;
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res[p++] = ((c >> 6) & 63) | 128;
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res[p++] = (c & 63) | 128;
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}
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}
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} else if (enc === 'hex') {
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msg = msg.replace(/[^a-z0-9]+/ig, '');
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if (msg.length % 2 !== 0)
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msg = '0' + msg;
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for (i = 0; i < msg.length; i += 2)
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res.push(parseInt(msg[i] + msg[i + 1], 16));
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}
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} else {
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for (i = 0; i < msg.length; i++)
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res[i] = msg[i] | 0;
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}
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return res;
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}
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exports.toArray = toArray;
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function toHex(msg) {
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var res = '';
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for (var i = 0; i < msg.length; i++)
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res += zero2(msg[i].toString(16));
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return res;
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}
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exports.toHex = toHex;
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function htonl(w) {
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var res = (w >>> 24) |
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((w >>> 8) & 0xff00) |
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((w << 8) & 0xff0000) |
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((w & 0xff) << 24);
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return res >>> 0;
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}
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exports.htonl = htonl;
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function toHex32(msg, endian) {
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var res = '';
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for (var i = 0; i < msg.length; i++) {
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var w = msg[i];
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if (endian === 'little')
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w = htonl(w);
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res += zero8(w.toString(16));
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}
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return res;
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}
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exports.toHex32 = toHex32;
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function zero2(word) {
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if (word.length === 1)
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return '0' + word;
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else
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return word;
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}
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exports.zero2 = zero2;
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function zero8(word) {
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if (word.length === 7)
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return '0' + word;
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else if (word.length === 6)
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return '00' + word;
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else if (word.length === 5)
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return '000' + word;
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else if (word.length === 4)
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return '0000' + word;
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else if (word.length === 3)
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return '00000' + word;
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else if (word.length === 2)
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return '000000' + word;
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else if (word.length === 1)
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return '0000000' + word;
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else
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return word;
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}
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exports.zero8 = zero8;
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function join32(msg, start, end, endian) {
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var len = end - start;
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assert(len % 4 === 0);
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var res = new Array(len / 4);
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for (var i = 0, k = start; i < res.length; i++, k += 4) {
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var w;
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if (endian === 'big')
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w = (msg[k] << 24) | (msg[k + 1] << 16) | (msg[k + 2] << 8) | msg[k + 3];
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else
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w = (msg[k + 3] << 24) | (msg[k + 2] << 16) | (msg[k + 1] << 8) | msg[k];
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res[i] = w >>> 0;
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}
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return res;
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}
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exports.join32 = join32;
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function split32(msg, endian) {
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var res = new Array(msg.length * 4);
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for (var i = 0, k = 0; i < msg.length; i++, k += 4) {
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var m = msg[i];
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if (endian === 'big') {
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res[k] = m >>> 24;
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res[k + 1] = (m >>> 16) & 0xff;
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res[k + 2] = (m >>> 8) & 0xff;
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res[k + 3] = m & 0xff;
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} else {
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res[k + 3] = m >>> 24;
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res[k + 2] = (m >>> 16) & 0xff;
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res[k + 1] = (m >>> 8) & 0xff;
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res[k] = m & 0xff;
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}
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}
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return res;
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}
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exports.split32 = split32;
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function rotr32(w, b) {
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return (w >>> b) | (w << (32 - b));
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}
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exports.rotr32 = rotr32;
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function rotl32(w, b) {
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return (w << b) | (w >>> (32 - b));
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}
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exports.rotl32 = rotl32;
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function sum32(a, b) {
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return (a + b) >>> 0;
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}
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exports.sum32 = sum32;
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function sum32_3(a, b, c) {
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return (a + b + c) >>> 0;
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}
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exports.sum32_3 = sum32_3;
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function sum32_4(a, b, c, d) {
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return (a + b + c + d) >>> 0;
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}
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exports.sum32_4 = sum32_4;
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function sum32_5(a, b, c, d, e) {
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return (a + b + c + d + e) >>> 0;
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}
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exports.sum32_5 = sum32_5;
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function sum64(buf, pos, ah, al) {
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var bh = buf[pos];
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var bl = buf[pos + 1];
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var lo = (al + bl) >>> 0;
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var hi = (lo < al ? 1 : 0) + ah + bh;
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buf[pos] = hi >>> 0;
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buf[pos + 1] = lo;
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}
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exports.sum64 = sum64;
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function sum64_hi(ah, al, bh, bl) {
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var lo = (al + bl) >>> 0;
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var hi = (lo < al ? 1 : 0) + ah + bh;
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return hi >>> 0;
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}
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exports.sum64_hi = sum64_hi;
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function sum64_lo(ah, al, bh, bl) {
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var lo = al + bl;
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return lo >>> 0;
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}
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exports.sum64_lo = sum64_lo;
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function sum64_4_hi(ah, al, bh, bl, ch, cl, dh, dl) {
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var carry = 0;
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var lo = al;
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lo = (lo + bl) >>> 0;
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carry += lo < al ? 1 : 0;
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lo = (lo + cl) >>> 0;
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carry += lo < cl ? 1 : 0;
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lo = (lo + dl) >>> 0;
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carry += lo < dl ? 1 : 0;
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var hi = ah + bh + ch + dh + carry;
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return hi >>> 0;
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}
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exports.sum64_4_hi = sum64_4_hi;
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function sum64_4_lo(ah, al, bh, bl, ch, cl, dh, dl) {
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var lo = al + bl + cl + dl;
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return lo >>> 0;
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}
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exports.sum64_4_lo = sum64_4_lo;
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function sum64_5_hi(ah, al, bh, bl, ch, cl, dh, dl, eh, el) {
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var carry = 0;
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var lo = al;
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lo = (lo + bl) >>> 0;
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carry += lo < al ? 1 : 0;
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lo = (lo + cl) >>> 0;
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carry += lo < cl ? 1 : 0;
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lo = (lo + dl) >>> 0;
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carry += lo < dl ? 1 : 0;
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lo = (lo + el) >>> 0;
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carry += lo < el ? 1 : 0;
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var hi = ah + bh + ch + dh + eh + carry;
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return hi >>> 0;
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}
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exports.sum64_5_hi = sum64_5_hi;
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function sum64_5_lo(ah, al, bh, bl, ch, cl, dh, dl, eh, el) {
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var lo = al + bl + cl + dl + el;
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return lo >>> 0;
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}
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exports.sum64_5_lo = sum64_5_lo;
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function rotr64_hi(ah, al, num) {
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var r = (al << (32 - num)) | (ah >>> num);
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return r >>> 0;
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}
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exports.rotr64_hi = rotr64_hi;
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function rotr64_lo(ah, al, num) {
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var r = (ah << (32 - num)) | (al >>> num);
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return r >>> 0;
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}
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exports.rotr64_lo = rotr64_lo;
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function shr64_hi(ah, al, num) {
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return ah >>> num;
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}
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exports.shr64_hi = shr64_hi;
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function shr64_lo(ah, al, num) {
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var r = (ah << (32 - num)) | (al >>> num);
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return r >>> 0;
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}
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exports.shr64_lo = shr64_lo;
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