119 lines
2.6 KiB
JavaScript
119 lines
2.6 KiB
JavaScript
// Sshwifty - A Web SSH client
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//
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// Copyright (C) 2019-2022 Ni Rui <ranqus@gmail.com>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as
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// published by the Free Software Foundation, either version 3 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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/**
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* Generate HMAC 512 of given data
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*
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* @param {Uint8Array} secret Secret key
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* @param {Uint8Array} data Data to be HMAC'ed
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*/
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export async function hmac512(secret, data) {
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const key = await window.crypto.subtle.importKey(
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"raw",
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secret,
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{
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name: "HMAC",
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hash: { name: "SHA-512" },
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},
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false,
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["sign", "verify"]
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);
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return window.crypto.subtle.sign(key.algorithm, key, data);
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}
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export const GCMNonceSize = 12;
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export const GCMKeyBitLen = 128;
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/**
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* Build AES GCM Encryption/Decryption key
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*
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* @param {Uint8Array} keyData Key data
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*/
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export function buildGCMKey(keyData) {
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return window.crypto.subtle.importKey(
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"raw",
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keyData,
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{
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name: "AES-GCM",
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length: GCMKeyBitLen,
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},
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false,
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["encrypt", "decrypt"]
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);
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}
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/**
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* Encrypt data
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*
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* @param {CryptoKey} key Key
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* @param {Uint8Array} iv Nonce
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* @param {Uint8Array} plaintext Data to be encrypted
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*/
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export function encryptGCM(key, iv, plaintext) {
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return window.crypto.subtle.encrypt(
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{ name: "AES-GCM", iv: iv, tagLength: GCMKeyBitLen },
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key,
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plaintext
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);
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}
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/**
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* Decrypt data
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*
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* @param {CryptoKey} key Key
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* @param {Uint8Array} iv Nonce
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* @param {Uint8Array} cipherText Data to be decrypted
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*/
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export function decryptGCM(key, iv, cipherText) {
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return window.crypto.subtle.decrypt(
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{ name: "AES-GCM", iv: iv, tagLength: GCMKeyBitLen },
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key,
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cipherText
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);
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}
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/**
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* generate Random nonce
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*
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*/
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export function generateNonce() {
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return window.crypto.getRandomValues(new Uint8Array(GCMNonceSize));
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}
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/**
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* Increase nonce by one
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*
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* @param {Uint8Array} nonce Nonce data
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*
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* @returns {Uint8Array} New nonce
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*
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*/
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export function increaseNonce(nonce) {
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for (let i = nonce.length; i > 0; i--) {
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nonce[i - 1]++;
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if (nonce[i - 1] <= 0) {
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continue;
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}
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break;
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}
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return nonce;
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}
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