router-toolkit/lib/Common/rsa.js

A npm module for managing routers and access points

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
const parseKeys_1 = __importDefault(require("./parseKeys"));
var crt = require('browserify-rsa');
var BN = require('bn.js');
var randomBytes = require('randombytes');
var Buffer = require('safe-buffer').Buffer;
function withPublic(paddedMsg, key) {
    return Buffer.from(paddedMsg.toRed(BN.mont(key.modulus)).redPow(new BN(key.publicExponent)).fromRed().toArray());
}
function publicEncrypt(publicKey, msg, reverse) {
    var padding;
    if (publicKey.padding) {
        padding = publicKey.padding;
    }
    else if (reverse) {
        padding = 1;
    }
    else {
        padding = 4;
    }
    var key = (0, parseKeys_1.default)(publicKey);
    var paddedMsg = pkcs1(key, msg, reverse);
    if (reverse) {
        return crt(paddedMsg, key);
    }
    else {
        return withPublic(paddedMsg, key);
    }
}
exports.default = publicEncrypt;
function pkcs1(key, msg, reverse) {
    var mLen = msg.length;
    var k = key.modulus.byteLength();
    if (mLen > k - 11) {
        throw new Error('message too long');
    }
    var ps;
    if (reverse) {
        ps = Buffer.alloc(k - mLen - 3, 0xff);
    }
    else {
        ps = nonZero(k - mLen - 3);
    }
    return new BN(Buffer.concat([Buffer.from([0, reverse ? 1 : 2]), ps, Buffer.alloc(1), msg], k));
}
function nonZero(len) {
    var out = Buffer.allocUnsafe(len);
    var i = 0;
    var cache = randomBytes(len * 2);
    var cur = 0;
    var num;
    while (i < len) {
        if (cur === cache.length) {
            cache = randomBytes(len * 2);
            cur = 0;
        }
        num = cache[cur++];
        if (num) {
            out[i++] = num;
        }
    }
    return out;
}