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const {
ArrayPrototypeIncludes,
ArrayPrototypePush,
BigInt,
FunctionPrototypeBind,
Number,
ObjectKeys,
Promise,
StringPrototypeToLowerCase,
Symbol,
} = primordials;
const {
getCiphers: _getCiphers,
getCurves: _getCurves,
getHashes: _getHashes,
setEngine: _setEngine,
secureHeapUsed: _secureHeapUsed,
} = internalBinding('crypto');
const { getOptionValue } = require('internal/options');
const {
crypto: {
ENGINE_METHOD_ALL
}
} = internalBinding('constants');
const normalizeHashName = require('internal/crypto/hashnames');
const {
hideStackFrames,
codes: {
ERR_CRYPTO_ENGINE_UNKNOWN,
ERR_INVALID_ARG_TYPE,
ERR_INVALID_ARG_VALUE,
ERR_OUT_OF_RANGE,
}
} = require('internal/errors');
const {
validateArray,
validateNumber,
validateString
} = require('internal/validators');
const { Buffer } = require('buffer');
const {
cachedResult,
filterDuplicateStrings,
lazyDOMException,
} = require('internal/util');
const {
isArrayBufferView,
isAnyArrayBuffer,
} = require('internal/util/types');
const kHandle = Symbol('kHandle');
const kKeyObject = Symbol('kKeyObject');
const lazyRequireCache = {};
function lazyRequire(name) {
let ret = lazyRequireCache[name];
if (ret === undefined)
ret = lazyRequireCache[name] = require(name);
return ret;
}
let defaultEncoding = 'buffer';
function setDefaultEncoding(val) {
defaultEncoding = val;
}
function getDefaultEncoding() {
return defaultEncoding;
}
// This is here because many functions accepted binary strings without
// any explicit encoding in older versions of node, and we don't want
// to break them unnecessarily.
function toBuf(val, encoding) {
if (typeof val === 'string') {
if (encoding === 'buffer')
encoding = 'utf8';
return Buffer.from(val, encoding);
}
return val;
}
const getCiphers = cachedResult(() => filterDuplicateStrings(_getCiphers()));
const getHashes = cachedResult(() => filterDuplicateStrings(_getHashes()));
const getCurves = cachedResult(() => filterDuplicateStrings(_getCurves()));
function setEngine(id, flags) {
validateString(id, 'id');
if (flags)
validateNumber(flags, 'flags');
flags = flags >>> 0;
// Use provided engine for everything by default
if (flags === 0)
flags = ENGINE_METHOD_ALL;
if (!_setEngine(id, flags))
throw new ERR_CRYPTO_ENGINE_UNKNOWN(id);
}
const getArrayBufferOrView = hideStackFrames((buffer, name, encoding) => {
if (isAnyArrayBuffer(buffer))
return buffer;
if (typeof buffer === 'string') {
if (encoding === 'buffer')
encoding = 'utf8';
return Buffer.from(buffer, encoding);
}
if (!isArrayBufferView(buffer)) {
throw new ERR_INVALID_ARG_TYPE(
name,
[
'string',
'ArrayBuffer',
'Buffer',
'TypedArray',
'DataView',
],
buffer
);
}
return buffer;
});
// The maximum buffer size that we'll support in the WebCrypto impl
const kMaxBufferLength = (2 ** 31) - 1;
// The EC named curves that we currently support via the Web Crypto API.
const kNamedCurveAliases = {
'P-256': 'prime256v1',
'P-384': 'secp384r1',
'P-521': 'secp521r1',
};
const kAesKeyLengths = [128, 192, 256];
// These are the only algorithms we currently support
// via the Web Crypto API
const kAlgorithms = {
'rsassa-pkcs1-v1_5': 'RSASSA-PKCS1-v1_5',
'rsa-pss': 'RSA-PSS',
'rsa-oaep': 'RSA-OAEP',
'ecdsa': 'ECDSA',
'ecdh': 'ECDH',
'aes-ctr': 'AES-CTR',
'aes-cbc': 'AES-CBC',
'aes-gcm': 'AES-GCM',
'aes-kw': 'AES-KW',
'hmac': 'HMAC',
'sha-1': 'SHA-1',
'sha-256': 'SHA-256',
'sha-384': 'SHA-384',
'sha-512': 'SHA-512',
'hkdf': 'HKDF',
'pbkdf2': 'PBKDF2',
'ed25519': 'Ed25519',
'ed448': 'Ed448',
'x25519': 'X25519',
'x448': 'X448',
};
const kAlgorithmsKeys = ObjectKeys(kAlgorithms);
// These are the only export and import formats we currently
// support via the Web Crypto API
const kExportFormats = [
'raw',
'pkcs8',
'spki',
'jwk'];
// These are the only hash algorithms we currently support via
// the Web Crypto API.
const kHashTypes = [
'SHA-1',
'SHA-256',
'SHA-384',
'SHA-512',
];
function validateMaxBufferLength(data, name) {
if (data.byteLength > kMaxBufferLength) {
throw lazyDOMException(
`${name} must be less than ${kMaxBufferLength + 1} bits`,
'OperationError');
}
}
function normalizeAlgorithm(algorithm) {
if (algorithm != null) {
if (typeof algorithm === 'string')
algorithm = { name: algorithm };
if (typeof algorithm === 'object') {
const { name } = algorithm;
if (typeof name !== 'string' ||
!ArrayPrototypeIncludes(
kAlgorithmsKeys,
StringPrototypeToLowerCase(name))) {
throw lazyDOMException('Unrecognized name.', 'NotSupportedError');
}
let { hash } = algorithm;
if (hash !== undefined) {
hash = normalizeAlgorithm(hash);
if (!ArrayPrototypeIncludes(kHashTypes, hash.name))
throw lazyDOMException('Unrecognized name.', 'NotSupportedError');
}
const normalized = {
...algorithm,
name: kAlgorithms[StringPrototypeToLowerCase(name)],
};
if (hash) {
normalized.hash = hash;
}
return normalized;
}
}
throw lazyDOMException('Unrecognized name.', 'NotSupportedError');
}
function hasAnyNotIn(set, checks) {
for (const s of set)
if (!ArrayPrototypeIncludes(checks, s))
return true;
return false;
}
function validateBitLength(length, name, required = false) {
if (length !== undefined || required) {
validateNumber(length, name);
if (length < 0)
throw new ERR_OUT_OF_RANGE(name, '> 0');
if (length % 8) {
throw new ERR_INVALID_ARG_VALUE(
name,
length,
'must be a multiple of 8');
}
}
}
function validateByteLength(buf, name, target) {
if (buf.byteLength !== target) {
throw lazyDOMException(
`${name} must contain exactly ${target} bytes`,
'OperationError');
}
}
const validateByteSource = hideStackFrames((val, name) => {
val = toBuf(val);
if (isAnyArrayBuffer(val) || isArrayBufferView(val))
return val;
throw new ERR_INVALID_ARG_TYPE(
name,
[
'string',
'ArrayBuffer',
'TypedArray',
'DataView',
'Buffer',
],
val);
});
function onDone(resolve, reject, err, result) {
if (err) return reject(err);
resolve(result);
}
function jobPromise(job) {
return new Promise((resolve, reject) => {
job.ondone = FunctionPrototypeBind(onDone, job, resolve, reject);
job.run();
});
}
// In WebCrypto, the publicExponent option in RSA is represented as a
// WebIDL "BigInteger"... that is, a Uint8Array that allows an arbitrary
// number of leading zero bits. Our conventional APIs for reading
// an unsigned int from a Buffer are not adequate. The implementation
// here is adapted from the chromium implementation here:
// https://github.com/chromium/chromium/blob/HEAD/third_party/blink/public/platform/web_crypto_algorithm_params.h, but ported to JavaScript
// Returns undefined if the conversion was unsuccessful.
function bigIntArrayToUnsignedInt(input) {
let result = 0;
for (let n = 0; n < input.length; ++n) {
const n_reversed = input.length - n - 1;
if (n_reversed >= 4 && input[n])
return; // Too large
result |= input[n] << 8 * n_reversed;
}
return result;
}
function bigIntArrayToUnsignedBigInt(input) {
let result = 0n;
for (let n = 0; n < input.length; ++n) {
const n_reversed = input.length - n - 1;
result |= BigInt(input[n]) << 8n * BigInt(n_reversed);
}
return result;
}
function getStringOption(options, key) {
let value;
if (options && (value = options[key]) != null)
validateString(value, `options.${key}`);
return value;
}
function getUsagesUnion(usageSet, ...usages) {
const newset = [];
for (let n = 0; n < usages.length; n++) {
if (usageSet.has(usages[n]))
ArrayPrototypePush(newset, usages[n]);
}
return newset;
}
function getHashLength(name) {
switch (name) {
case 'SHA-1': return 160;
case 'SHA-256': return 256;
case 'SHA-384': return 384;
case 'SHA-512': return 512;
}
}
const kKeyOps = {
sign: 1,
verify: 2,
encrypt: 3,
decrypt: 4,
wrapKey: 5,
unwrapKey: 6,
deriveKey: 7,
deriveBits: 8,
};
function validateKeyOps(keyOps, usagesSet) {
if (keyOps === undefined) return;
validateArray(keyOps, 'keyData.key_ops');
let flags = 0;
for (let n = 0; n < keyOps.length; n++) {
const op = keyOps[n];
const op_flag = kKeyOps[op];
// Skipping unknown key ops
if (op_flag === undefined)
continue;
// Have we seen it already? if so, error
if (flags & (1 << op_flag))
throw lazyDOMException('Duplicate key operation', 'DataError');
flags |= (1 << op_flag);
// TODO(@jasnell): RFC7517 section 4.3 strong recommends validating
// key usage combinations. Specifically, it says that unrelated key
// ops SHOULD NOT be used together. We're not yet validating that here.
}
if (usagesSet !== undefined) {
for (const use of usagesSet) {
if (!ArrayPrototypeIncludes(keyOps, use)) {
throw lazyDOMException(
'Key operations and usage mismatch',
'DataError');
}
}
}
}
function secureHeapUsed() {
const val = _secureHeapUsed();
if (val === undefined)
return { total: 0, used: 0, utilization: 0, min: 0 };
const used = Number(_secureHeapUsed());
const total = Number(getOptionValue('--secure-heap'));
const min = Number(getOptionValue('--secure-heap-min'));
const utilization = used / total;
return { total, used, utilization, min };
}
module.exports = {
getArrayBufferOrView,
getCiphers,
getCurves,
getDefaultEncoding,
getHashes,
kHandle,
kKeyObject,
setDefaultEncoding,
setEngine,
toBuf,
kHashTypes,
kNamedCurveAliases,
kAesKeyLengths,
kExportFormats,
normalizeAlgorithm,
normalizeHashName,
hasAnyNotIn,
validateBitLength,
validateByteLength,
validateByteSource,
validateKeyOps,
jobPromise,
lazyRequire,
validateMaxBufferLength,
bigIntArrayToUnsignedBigInt,
bigIntArrayToUnsignedInt,
getStringOption,
getUsagesUnion,
getHashLength,
secureHeapUsed,
};
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