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This commit is contained in:
Daniel Gasienica 2018-04-27 17:25:04 -04:00
parent b4dee3f30b
commit 1dd87ad197
149 changed files with 17847 additions and 15439 deletions
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28
js/modules/crypto.js
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@ -19,8 +19,15 @@ async function encryptSymmetric(key, plaintext) {
const cipherKey = await _hmac_SHA256(key, nonce);
const macKey = await _hmac_SHA256(key, cipherKey);
const cipherText = await _encrypt_aes256_CBC_PKCSPadding(cipherKey, iv, plaintext);
const mac = _getFirstBytes(await _hmac_SHA256(macKey, cipherText), MAC_LENGTH);
const cipherText = await _encrypt_aes256_CBC_PKCSPadding(
cipherKey,
iv,
plaintext
);
const mac = _getFirstBytes(
await _hmac_SHA256(macKey, cipherText),
MAC_LENGTH
);
return _concatData([nonce, cipherText, mac]);
}
@ -39,9 +46,14 @@ async function decryptSymmetric(key, data) {
const cipherKey = await _hmac_SHA256(key, nonce);
const macKey = await _hmac_SHA256(key, cipherKey);
const ourMac = _getFirstBytes(await _hmac_SHA256(macKey, cipherText), MAC_LENGTH);
const ourMac = _getFirstBytes(
await _hmac_SHA256(macKey, cipherText),
MAC_LENGTH
);
if (!constantTimeEqual(theirMac, ourMac)) {
throw new Error('decryptSymmetric: Failed to decrypt; MAC verification failed');
throw new Error(
'decryptSymmetric: Failed to decrypt; MAC verification failed'
);
}
return _decrypt_aes256_CBC_PKCSPadding(cipherKey, iv, cipherText);
@ -61,7 +73,6 @@ function constantTimeEqual(left, right) {
return result === 0;
}
async function _hmac_SHA256(key, data) {
const extractable = false;
const cryptoKey = await window.crypto.subtle.importKey(
@ -72,7 +83,11 @@ async function _hmac_SHA256(key, data) {
['sign']
);
return window.crypto.subtle.sign({ name: 'HMAC', hash: 'SHA-256' }, cryptoKey, data);
return window.crypto.subtle.sign(
{ name: 'HMAC', hash: 'SHA-256' },
cryptoKey,
data
);
}
async function _encrypt_aes256_CBC_PKCSPadding(key, iv, data) {
@ -101,7 +116,6 @@ async function _decrypt_aes256_CBC_PKCSPadding(key, iv, data) {
return window.crypto.subtle.decrypt({ name: 'AES-CBC', iv }, cryptoKey, data);
}
function _getRandomBytes(n) {
const bytes = new Uint8Array(n);
window.crypto.getRandomValues(bytes);