59 lines
1.3 KiB
JavaScript
59 lines
1.3 KiB
JavaScript
import { generate_prime } from "./random_primes.js";
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import { mod_exp, mod_inv } from "./math.js";
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let p, q, pubKey, privKey;
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export class RsaPubKey {
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constructor(n, e) {
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this.n = n;
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this.e = e;
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}
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encrypt(m) {
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return mod_exp(m, this.e, this.n);
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}
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toJSON() {
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return {
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n: "0x" + this.n.toString(16),
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e: "0x" + this.e.toString(16),
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};
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}
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static fromJSON(data) {
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return new RsaPubKey(BigInt(data.n), BigInt(data.e));
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}
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}
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class RsaPrivKey {
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constructor(p, q) {
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this.n = p * q;
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this.d = mod_inv(65537n, (q - 1n) * (p - 1n));
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}
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decrypt(c) {
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return mod_exp(c, this.d, this.n);
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}
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}
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export function generate_rsa_keypair() {
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if (window.sessionStorage.getItem("rsa_p") === null) {
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p = generate_prime();
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window.sessionStorage.setItem("rsa_p", p);
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} else {
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p = BigInt(window.sessionStorage.getItem("rsa_p"));
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}
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if (window.sessionStorage.getItem("rsa_q") === null) {
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q = generate_prime();
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window.sessionStorage.setItem("rsa_q", q);
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} else {
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q = BigInt(window.sessionStorage.getItem("rsa_q"));
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}
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pubKey = new RsaPubKey(p * q, 65537n);
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privKey = new RsaPrivKey(p, q);
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return { pubKey, privKey };
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}
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