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mac.js
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197 lines (172 loc) · 4.35 KB
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'use strict';
const {
SafeSet,
StringPrototypeSubstring,
} = primordials;
const {
HmacJob,
KmacJob,
kCryptoJobAsync,
kSignJobModeSign,
kSignJobModeVerify,
SecretKeyGenJob,
} = internalBinding('crypto');
const {
getBlockSize,
getUsagesMask,
hasAnyNotIn,
jobPromise,
normalizeHashName,
kHandle,
} = require('internal/crypto/util');
const {
lazyDOMException,
} = require('internal/util');
const {
InternalCryptoKey,
getCryptoKeyAlgorithm,
getCryptoKeyHandle,
} = require('internal/crypto/keys');
const {
importJwkSecretKey,
importSecretKey,
validateJwk,
} = require('internal/crypto/webcrypto_util');
async function hmacGenerateKey(algorithm, extractable, keyUsages) {
const {
hash,
name,
length = getBlockSize(hash.name),
} = algorithm;
const usageSet = new SafeSet(keyUsages);
if (hasAnyNotIn(usageSet, ['sign', 'verify'])) {
throw lazyDOMException(
'Unsupported key usage for an HMAC key',
'SyntaxError');
}
const handle = await jobPromise(() => new SecretKeyGenJob(kCryptoJobAsync, length));
return new InternalCryptoKey(
handle,
{ name, length, hash },
getUsagesMask(usageSet),
extractable);
}
async function kmacGenerateKey(algorithm, extractable, keyUsages) {
const {
name,
length = {
__proto__: null,
KMAC128: 128,
KMAC256: 256,
}[name],
} = algorithm;
const usageSet = new SafeSet(keyUsages);
if (hasAnyNotIn(usageSet, ['sign', 'verify'])) {
throw lazyDOMException(
`Unsupported key usage for ${name} key`,
'SyntaxError');
}
const handle = await jobPromise(() => new SecretKeyGenJob(kCryptoJobAsync, length));
return new InternalCryptoKey(
handle,
{ name, length },
getUsagesMask(usageSet),
extractable);
}
function macImportKey(
format,
keyData,
algorithm,
extractable,
keyUsages,
) {
const isHmac = algorithm.name === 'HMAC';
const usagesSet = new SafeSet(keyUsages);
if (hasAnyNotIn(usagesSet, ['sign', 'verify'])) {
throw lazyDOMException(
`Unsupported key usage for ${algorithm.name} key`,
'SyntaxError');
}
let handle;
let length;
switch (format) {
case 'KeyObject': {
length = keyData.symmetricKeySize * 8;
handle = keyData[kHandle];
break;
}
case 'raw-secret':
case 'raw': {
if (format === 'raw' && !isHmac) {
return undefined;
}
length = keyData.byteLength * 8;
handle = importSecretKey(keyData);
break;
}
case 'jwk': {
validateJwk(keyData, 'oct', extractable, usagesSet, 'sig');
if (keyData.alg !== undefined) {
const expected = isHmac ?
normalizeHashName(algorithm.hash.name, normalizeHashName.kContextJwkHmac) :
`K${StringPrototypeSubstring(algorithm.name, 4)}`;
if (expected && keyData.alg !== expected)
throw lazyDOMException(
'JWK "alg" does not match the requested algorithm',
'DataError');
}
handle = importJwkSecretKey(keyData);
length = handle.getSymmetricKeySize() * 8;
break;
}
default:
return undefined;
}
if (length === 0)
throw lazyDOMException('Zero-length key is not supported', 'DataError');
if (algorithm.length !== undefined &&
algorithm.length !== length) {
throw lazyDOMException('Invalid key length', 'DataError');
}
const algorithmObject = {
name: algorithm.name,
length,
};
if (isHmac) {
algorithmObject.hash = algorithm.hash;
}
return new InternalCryptoKey(
handle,
algorithmObject,
getUsagesMask(usagesSet),
extractable);
}
function hmacSignVerify(key, data, algorithm, signature) {
const mode = signature === undefined ? kSignJobModeSign : kSignJobModeVerify;
return jobPromise(() => new HmacJob(
kCryptoJobAsync,
mode,
normalizeHashName(getCryptoKeyAlgorithm(key).hash.name),
getCryptoKeyHandle(key),
data,
signature));
}
function kmacSignVerify(key, data, algorithm, signature) {
const mode = signature === undefined ? kSignJobModeSign : kSignJobModeVerify;
return jobPromise(() => new KmacJob(
kCryptoJobAsync,
mode,
getCryptoKeyHandle(key),
algorithm.name,
algorithm.customization,
algorithm.outputLength / 8,
data,
signature));
}
module.exports = {
macImportKey,
hmacGenerateKey,
hmacSignVerify,
kmacGenerateKey,
kmacSignVerify,
};