58 lines
2.5 KiB
JavaScript
58 lines
2.5 KiB
JavaScript
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// We use WebCrypto aka globalThis.crypto, which exists in browsers and node.js 16+.
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// node.js versions earlier than v19 don't declare it in global scope.
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// For node.js, package.js on#exports field mapping rewrites import
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// from `crypto` to `cryptoNode`, which imports native module.
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// Makes the utils un-importable in browsers without a bundler.
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// Once node.js 18 is deprecated, we can just drop the import.
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import { crypto } from '@noble/ciphers/webcrypto/crypto';
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import { concatBytes } from '../utils.js';
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import { number } from '../_assert.js';
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/**
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* Secure PRNG. Uses `crypto.getRandomValues`, which defers to OS.
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*/
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export function randomBytes(bytesLength = 32) {
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if (crypto && typeof crypto.getRandomValues === 'function') {
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return crypto.getRandomValues(new Uint8Array(bytesLength));
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}
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throw new Error('crypto.getRandomValues must be defined');
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}
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export function getWebcryptoSubtle() {
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if (crypto && typeof crypto.subtle === 'object' && crypto.subtle != null)
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return crypto.subtle;
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throw new Error('crypto.subtle must be defined');
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}
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// Uses CSPRG for nonce, nonce injected in ciphertext
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export function managedNonce(fn) {
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number(fn.nonceLength);
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return ((key, ...args) => ({
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encrypt: (plaintext, ...argsEnc) => {
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const { nonceLength } = fn;
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const nonce = randomBytes(nonceLength);
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const ciphertext = fn(key, nonce, ...args).encrypt(plaintext, ...argsEnc);
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const out = concatBytes(nonce, ciphertext);
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ciphertext.fill(0);
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return out;
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},
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decrypt: (ciphertext, ...argsDec) => {
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const { nonceLength } = fn;
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const nonce = ciphertext.subarray(0, nonceLength);
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const data = ciphertext.subarray(nonceLength);
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return fn(key, nonce, ...args).decrypt(data, ...argsDec);
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},
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}));
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}
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// // Type tests
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// import { siv, gcm, ctr, ecb, cbc } from '../aes.js';
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// import { xsalsa20poly1305 } from '../salsa.js';
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// import { chacha20poly1305, xchacha20poly1305 } from '../chacha.js';
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// const wsiv = managedNonce(siv);
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// const wgcm = managedNonce(gcm);
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// const wctr = managedNonce(ctr);
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// const wcbc = managedNonce(cbc);
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// const wsalsapoly = managedNonce(xsalsa20poly1305);
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// const wchacha = managedNonce(chacha20poly1305);
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// const wxchacha = managedNonce(xchacha20poly1305);
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// // should fail
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// const wcbc2 = managedNonce(managedNonce(cbc));
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// const wecb = managedNonce(ecb);
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//# sourceMappingURL=utils.js.map
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