Press n or j to go to the next uncovered block, b, p or k for the previous block.
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const {
ArrayBufferIsView,
ArrayBufferPrototypeSlice,
ArrayFrom,
ArrayPrototypeIncludes,
ArrayPrototypePush,
MathFloor,
Promise,
SafeSet,
TypedArrayPrototypeSlice,
} = primordials;
const {
AESCipherJob,
KeyObjectHandle,
kCryptoJobAsync,
kKeyVariantAES_CTR_128,
kKeyVariantAES_CBC_128,
kKeyVariantAES_GCM_128,
kKeyVariantAES_KW_128,
kKeyVariantAES_CTR_192,
kKeyVariantAES_CBC_192,
kKeyVariantAES_GCM_192,
kKeyVariantAES_KW_192,
kKeyVariantAES_CTR_256,
kKeyVariantAES_CBC_256,
kKeyVariantAES_GCM_256,
kKeyVariantAES_KW_256,
kWebCryptoCipherDecrypt,
kWebCryptoCipherEncrypt,
} = internalBinding('crypto');
const {
getArrayBufferOrView,
hasAnyNotIn,
jobPromise,
validateByteLength,
validateKeyOps,
validateMaxBufferLength,
kAesKeyLengths,
kHandle,
kKeyObject,
} = require('internal/crypto/util');
const {
lazyDOMException,
} = require('internal/util');
const { PromiseReject } = primordials;
const {
codes: {
ERR_INVALID_ARG_TYPE,
}
} = require('internal/errors');
const {
InternalCryptoKey,
SecretKeyObject,
createSecretKey,
isKeyObject,
} = require('internal/crypto/keys');
const {
generateKey,
} = require('internal/crypto/keygen');
const {
validateInteger,
validateOneOf,
} = require('internal/validators');
const kMaxCounterLength = 128;
const kTagLengths = [32, 64, 96, 104, 112, 120, 128];
function getAlgorithmName(name, length) {
switch (name) {
case 'AES-CBC': return `A${length}CBC`;
case 'AES-CTR': return `A${length}CTR`;
case 'AES-GCM': return `A${length}GCM`;
case 'AES-KW': return `A${length}KW`;
}
}
function validateKeyLength(length) {
if (length !== 128 && length !== 192 && length !== 256)
throw lazyDOMException('Invalid key length', 'DataError');
}
function getVariant(name, length) {
switch (name) {
case 'AES-CBC':
switch (length) {
case 128: return kKeyVariantAES_CBC_128;
case 192: return kKeyVariantAES_CBC_192;
case 256: return kKeyVariantAES_CBC_256;
}
break;
case 'AES-CTR':
switch (length) {
case 128: return kKeyVariantAES_CTR_128;
case 192: return kKeyVariantAES_CTR_192;
case 256: return kKeyVariantAES_CTR_256;
}
break;
case 'AES-GCM':
switch (length) {
case 128: return kKeyVariantAES_GCM_128;
case 192: return kKeyVariantAES_GCM_192;
case 256: return kKeyVariantAES_GCM_256;
}
break;
case 'AES-KW':
switch (length) {
case 128: return kKeyVariantAES_KW_128;
case 192: return kKeyVariantAES_KW_192;
case 256: return kKeyVariantAES_KW_256;
}
break;
}
}
function asyncAesCtrCipher(mode, key, data, { counter, length }) {
counter = getArrayBufferOrView(counter, 'algorithm.counter');
validateByteLength(counter, 'algorithm.counter', 16);
// The length must specify an integer between 1 and 128. While
// there is no default, this should typically be 64.
if (typeof length !== 'number' ||
length <= 0 ||
length > kMaxCounterLength) {
throw lazyDOMException(
'AES-CTR algorithm.length must be between 1 and 128',
'OperationError');
}
return jobPromise(new AESCipherJob(
kCryptoJobAsync,
mode,
key[kKeyObject][kHandle],
data,
getVariant('AES-CTR', key.algorithm.length),
counter,
length));
}
function asyncAesCbcCipher(mode, key, data, { iv }) {
iv = getArrayBufferOrView(iv, 'algorithm.iv');
validateByteLength(iv, 'algorithm.iv', 16);
return jobPromise(new AESCipherJob(
kCryptoJobAsync,
mode,
key[kKeyObject][kHandle],
data,
getVariant('AES-CBC', key.algorithm.length),
iv));
}
function asyncAesKwCipher(mode, key, data) {
return jobPromise(new AESCipherJob(
kCryptoJobAsync,
mode,
key[kKeyObject][kHandle],
data,
getVariant('AES-KW', key.algorithm.length)));
}
function asyncAesGcmCipher(
mode,
key,
data,
{ iv, additionalData, tagLength = 128 }) {
if (!ArrayPrototypeIncludes(kTagLengths, tagLength)) {
return PromiseReject(lazyDOMException(
`${tagLength} is not a valid AES-GCM tag length`,
'OperationError'));
}
iv = getArrayBufferOrView(iv, 'algorithm.iv');
validateMaxBufferLength(iv, 'algorithm.iv');
if (additionalData !== undefined) {
additionalData =
getArrayBufferOrView(additionalData, 'algorithm.additionalData');
validateMaxBufferLength(additionalData, 'algorithm.additionalData');
}
const tagByteLength = MathFloor(tagLength / 8);
let tag;
switch (mode) {
case kWebCryptoCipherDecrypt: {
const slice = ArrayBufferIsView(data) ?
TypedArrayPrototypeSlice : ArrayBufferPrototypeSlice;
tag = slice(data, -tagByteLength);
// Refs: https://www.w3.org/TR/WebCryptoAPI/#aes-gcm-operations
//
// > If *plaintext* has a length less than *tagLength* bits, then `throw`
// > an `OperationError`.
if (tagByteLength > tag.byteLength) {
return PromiseReject(lazyDOMException(
'The provided data is too small.',
'OperationError'));
}
data = slice(data, 0, -tagByteLength);
break;
}
case kWebCryptoCipherEncrypt:
tag = tagByteLength;
break;
}
return jobPromise(new AESCipherJob(
kCryptoJobAsync,
mode,
key[kKeyObject][kHandle],
data,
getVariant('AES-GCM', key.algorithm.length),
iv,
tag,
additionalData));
}
function aesCipher(mode, key, data, algorithm) {
switch (algorithm.name) {
case 'AES-CTR': return asyncAesCtrCipher(mode, key, data, algorithm);
case 'AES-CBC': return asyncAesCbcCipher(mode, key, data, algorithm);
case 'AES-GCM': return asyncAesGcmCipher(mode, key, data, algorithm);
case 'AES-KW': return asyncAesKwCipher(mode, key, data);
}
}
async function aesGenerateKey(algorithm, extractable, keyUsages) {
const { name, length } = algorithm;
validateInteger(length, 'algorithm.length');
validateOneOf(length, 'algorithm.length', kAesKeyLengths);
const usageSet = new SafeSet(keyUsages);
if (hasAnyNotIn(usageSet, ['encrypt', 'decrypt', 'wrapKey', 'unwrapKey'])) {
throw lazyDOMException(
'Unsupported key usage for an AES key',
'SyntaxError');
}
return new Promise((resolve, reject) => {
generateKey('aes', { length }, (err, key) => {
if (err) {
return reject(lazyDOMException(
'The operation failed for an operation-specific reason ' +
`[${err.message}]`,
'OperationError'));
}
resolve(new InternalCryptoKey(
key,
{ name, length },
ArrayFrom(usageSet),
extractable));
});
});
}
async function aesImportKey(
algorithm,
format,
keyData,
extractable,
keyUsages) {
const { name } = algorithm;
const checkUsages = ['wrapKey', 'unwrapKey'];
if (name !== 'AES-KW')
ArrayPrototypePush(checkUsages, 'encrypt', 'decrypt');
const usagesSet = new SafeSet(keyUsages);
if (hasAnyNotIn(usagesSet, checkUsages)) {
throw lazyDOMException(
'Unsupported key usage for an AES key',
'SyntaxError');
}
let keyObject;
let length;
switch (format) {
case 'node.keyObject': {
if (!isKeyObject(keyData))
throw new ERR_INVALID_ARG_TYPE('keyData', 'KeyObject', keyData);
if (keyData.type !== 'secret') {
throw lazyDOMException(
`Unable to import AES key with format ${format}`,
'NotSupportedError');
}
keyObject = keyData;
break;
}
case 'raw': {
validateKeyLength(keyData.byteLength * 8);
keyObject = createSecretKey(keyData);
break;
}
case 'jwk': {
if (keyData == null || typeof keyData !== 'object')
throw lazyDOMException('Invalid JWK keyData', 'DataError');
if (keyData.kty !== 'oct')
throw lazyDOMException('Invalid key type', 'DataError');
if (usagesSet.size > 0 &&
keyData.use !== undefined &&
keyData.use !== 'enc') {
throw lazyDOMException('Invalid use type', 'DataError');
}
validateKeyOps(keyData.key_ops, usagesSet);
if (keyData.ext !== undefined &&
keyData.ext === false &&
extractable === true) {
throw lazyDOMException('JWK is not extractable', 'DataError');
}
const handle = new KeyObjectHandle();
handle.initJwk(keyData);
({ length } = handle.keyDetail({ }));
validateKeyLength(length);
if (keyData.alg !== undefined) {
if (typeof keyData.alg !== 'string')
throw lazyDOMException('Invalid alg', 'DataError');
if (keyData.alg !== getAlgorithmName(algorithm.name, length))
throw lazyDOMException('Algorithm mismatch', 'DataError');
}
keyObject = new SecretKeyObject(handle);
break;
}
default:
throw lazyDOMException(
`Unable to import AES key with format ${format}`,
'NotSupportedError');
}
if (length === undefined) {
({ length } = keyObject[kHandle].keyDetail({ }));
validateKeyLength(length);
}
return new InternalCryptoKey(
keyObject,
{ name, length },
keyUsages,
extractable);
}
module.exports = {
aesCipher,
aesGenerateKey,
aesImportKey,
getAlgorithmName,
};
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