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Текущая директория: /usr/lib/node_modules/bitgo/node_modules/@noble/ciphers/esm
Просмотр файла: webcrypto.js
/**
* WebCrypto-based AES gcm/ctr/cbc, `managedNonce` and `randomBytes`.
* We use WebCrypto aka globalThis.crypto, which exists in browsers and node.js 16+.
* node.js versions earlier than v19 don't declare it in global scope.
* For node.js, package.js on#exports field mapping rewrites import
* from `crypto` to `cryptoNode`, which imports native module.
* Makes the utils un-importable in browsers without a bundler.
* Once node.js 18 is deprecated, we can just drop the import.
* @module
*/
// Use full path so that Node.js can rewrite it to `cryptoNode.js`.
import { crypto } from '@noble/ciphers/crypto';
import { abytes, anumber, concatBytes } from "./utils.js";
/**
* Secure PRNG. Uses `crypto.getRandomValues`, which defers to OS.
*/
export function randomBytes(bytesLength = 32) {
if (crypto && typeof crypto.getRandomValues === 'function') {
return crypto.getRandomValues(new Uint8Array(bytesLength));
}
// Legacy Node.js compatibility
if (crypto && typeof crypto.randomBytes === 'function') {
return Uint8Array.from(crypto.randomBytes(bytesLength));
}
throw new Error('crypto.getRandomValues must be defined');
}
export function getWebcryptoSubtle() {
if (crypto && typeof crypto.subtle === 'object' && crypto.subtle != null)
return crypto.subtle;
throw new Error('crypto.subtle must be defined');
}
/**
* Uses CSPRG for nonce, nonce injected in ciphertext.
* @example
* const gcm = managedNonce(aes.gcm);
* const ciphr = gcm(key).encrypt(data);
* const plain = gcm(key).decrypt(ciph);
*/
export function managedNonce(fn) {
const { nonceLength } = fn;
anumber(nonceLength);
return ((key, ...args) => ({
encrypt(plaintext, ...argsEnc) {
const nonce = randomBytes(nonceLength);
const ciphertext = fn(key, nonce, ...args).encrypt(plaintext, ...argsEnc);
const out = concatBytes(nonce, ciphertext);
ciphertext.fill(0);
return out;
},
decrypt(ciphertext, ...argsDec) {
const nonce = ciphertext.subarray(0, nonceLength);
const data = ciphertext.subarray(nonceLength);
return fn(key, nonce, ...args).decrypt(data, ...argsDec);
},
}));
}
// Overridable
// @TODO
export const utils = {
async encrypt(key, keyParams, cryptParams, plaintext) {
const cr = getWebcryptoSubtle();
const iKey = await cr.importKey('raw', key, keyParams, true, ['encrypt']);
const ciphertext = await cr.encrypt(cryptParams, iKey, plaintext);
return new Uint8Array(ciphertext);
},
async decrypt(key, keyParams, cryptParams, ciphertext) {
const cr = getWebcryptoSubtle();
const iKey = await cr.importKey('raw', key, keyParams, true, ['decrypt']);
const plaintext = await cr.decrypt(cryptParams, iKey, ciphertext);
return new Uint8Array(plaintext);
},
};
const mode = {
CBC: 'AES-CBC',
CTR: 'AES-CTR',
GCM: 'AES-GCM',
};
function getCryptParams(algo, nonce, AAD) {
if (algo === mode.CBC)
return { name: mode.CBC, iv: nonce };
if (algo === mode.CTR)
return { name: mode.CTR, counter: nonce, length: 64 };
if (algo === mode.GCM) {
if (AAD)
return { name: mode.GCM, iv: nonce, additionalData: AAD };
else
return { name: mode.GCM, iv: nonce };
}
throw new Error('unknown aes block mode');
}
function generate(algo) {
return (key, nonce, AAD) => {
abytes(key);
abytes(nonce);
const keyParams = { name: algo, length: key.length * 8 };
const cryptParams = getCryptParams(algo, nonce, AAD);
let consumed = false;
return {
// keyLength,
encrypt(plaintext) {
abytes(plaintext);
if (consumed)
throw new Error('Cannot encrypt() twice with same key / nonce');
consumed = true;
return utils.encrypt(key, keyParams, cryptParams, plaintext);
},
decrypt(ciphertext) {
abytes(ciphertext);
return utils.decrypt(key, keyParams, cryptParams, ciphertext);
},
};
};
}
/** AES-CBC, native webcrypto version */
export const cbc = /* @__PURE__ */ (() => generate(mode.CBC))();
/** AES-CTR, native webcrypto version */
export const ctr = /* @__PURE__ */ (() => generate(mode.CTR))();
/** AES-GCM, native webcrypto version */
export const gcm =
/* @__PURE__ */ (() => generate(mode.GCM))();
// // Type tests
// import { siv, gcm, ctr, ecb, cbc } from '../aes.ts';
// import { xsalsa20poly1305 } from '../salsa.ts';
// import { chacha20poly1305, xchacha20poly1305 } from '../chacha.ts';
// const wsiv = managedNonce(siv);
// const wgcm = managedNonce(gcm);
// const wctr = managedNonce(ctr);
// const wcbc = managedNonce(cbc);
// const wsalsapoly = managedNonce(xsalsa20poly1305);
// const wchacha = managedNonce(chacha20poly1305);
// const wxchacha = managedNonce(xchacha20poly1305);
// // should fail
// const wcbc2 = managedNonce(managedNonce(cbc));
// const wctr = managedNonce(ctr);
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