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crypto: add keyObject.asymmetricKeyDetails for asymmetric keys · nodejs/node@1149af6 · GitHub

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Commit 1149af6

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panva
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ruyadorno
committed
crypto: add keyObject.asymmetricKeyDetails for asymmetric keys
This API exposes key details. It is conceptually different from the previously discussed keyObject.fields property since it does not give access to information that could compromise the security of the key, and the obtained information cannot be used to uniquely identify a key. The intended purpose is to determine "security properties" of keys, e.g. to generate a new key pair with the same parameters, or to decide whether a key is secure enough. closes #30045 PR-URL: #36188 Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Tobias Nießen <tniessen@tnie.de> Reviewed-By: Rich Trott <rtrott@gmail.com>
1 parent 82eccdd commit 1149af6

5 files changed

Lines changed: 139 additions & 4 deletions

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‎doc/api/crypto.md‎

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@@ -1284,6 +1284,25 @@ passing keys as strings or `Buffer`s due to improved security features.
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The receiver obtains a cloned `KeyObject`, and the `KeyObject` does not need to
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be listed in the `transferList` argument.
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### `keyObject.asymmetricKeyDetails`
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<!-- YAML
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added: REPLACEME
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-->
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* {Object}
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* `modulusLength`: {number} Key size in bits (RSA, DSA).
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* `publicExponent`: {bigint} Public exponent (RSA).
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* `divisorLength`: {number} Size of `q` in bits (DSA).
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* `namedCurve`: {string} Name of the curve (EC).
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This property exists only on asymmetric keys. Depending on the type of the key,
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this object contains information about the key. None of the information obtained
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through this property can be used to uniquely identify a key or to compromise
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the security of the key.
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RSA-PSS parameters, DH, or any future key type details might be exposed via this
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API using additional attributes.
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### `keyObject.asymmetricKeyType`
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<!-- YAML
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added: v11.6.0

‎lib/internal/crypto/keys.js‎

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@@ -5,6 +5,7 @@ const {
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ObjectDefineProperty,
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ObjectSetPrototypeOf,
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Symbol,
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Uint8Array,
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} = primordials;
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const {
@@ -36,6 +37,7 @@ const {
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kHandle,
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kKeyObject,
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getArrayBufferOrView,
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bigIntArrayToUnsignedBigInt,
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} = require('internal/crypto/util');
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const {
@@ -128,12 +130,39 @@ const [
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}
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const kAsymmetricKeyType = Symbol('kAsymmetricKeyType');
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const kAsymmetricKeyDetails = Symbol('kAsymmetricKeyDetails');
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function normalizeKeyDetails(details = {}) {
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if (details.publicExponent !== undefined) {
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return {
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...details,
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publicExponent:
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bigIntArrayToUnsignedBigInt(new Uint8Array(details.publicExponent))
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};
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}
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return details;
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}
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class AsymmetricKeyObject extends KeyObject {
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get asymmetricKeyType() {
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return this[kAsymmetricKeyType] ||
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(this[kAsymmetricKeyType] = this[kHandle].getAsymmetricKeyType());
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}
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get asymmetricKeyDetails() {
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switch (this.asymmetricKeyType) {
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case 'rsa':
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case 'rsa-pss':
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case 'dsa':
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case 'ec':
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return this[kAsymmetricKeyDetails] ||
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(this[kAsymmetricKeyDetails] = normalizeKeyDetails(
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this[kHandle].keyDetail({})
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));
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default:
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return {};
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}
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}
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}
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class PublicKeyObject extends AsymmetricKeyObject {

‎lib/internal/crypto/util.js‎

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@@ -3,6 +3,7 @@
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const {
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ArrayPrototypeIncludes,
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ArrayPrototypePush,
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BigInt,
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FunctionPrototypeBind,
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Number,
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Promise,
@@ -308,6 +309,17 @@ function bigIntArrayToUnsignedInt(input) {
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return result;
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}
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function bigIntArrayToUnsignedBigInt(input) {
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let result = 0n;
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for (let n = 0; n < input.length; ++n) {
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const n_reversed = input.length - n - 1;
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result |= BigInt(input[n]) << 8n * BigInt(n_reversed);
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}
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return result;
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}
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function getStringOption(options, key) {
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let value;
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if (options && (value = options[key]) != null)
@@ -413,6 +425,7 @@ module.exports = {
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jobPromise,
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lazyRequire,
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validateMaxBufferLength,
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bigIntArrayToUnsignedBigInt,
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bigIntArrayToUnsignedInt,
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getStringOption,
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getUsagesUnion,

‎test/parallel/test-crypto-key-objects.js‎

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@@ -70,6 +70,7 @@ const privateDsa = fixtures.readKey('dsa_private_encrypted_1025.pem',
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assert.strictEqual(key.type, 'secret');
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assert.strictEqual(key.symmetricKeySize, 32);
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assert.strictEqual(key.asymmetricKeyType, undefined);
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assert.strictEqual(key.asymmetricKeyDetails, undefined);
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const exportedKey = key.export();
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assert(keybuf.equals(exportedKey));

‎test/parallel/test-crypto-keygen.js‎

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@@ -114,6 +114,31 @@ const sec1EncExp = (cipher) => getRegExpForPEM('EC PRIVATE KEY', cipher);
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testSignVerify(publicKey, privateKey);
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}
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{
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// Test sync key generation with key objects with a non-standard
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// publicExpononent
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const { publicKey, privateKey } = generateKeyPairSync('rsa', {
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publicExponent: 3,
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modulusLength: 512
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});
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assert.strictEqual(typeof publicKey, 'object');
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assert.strictEqual(publicKey.type, 'public');
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assert.strictEqual(publicKey.asymmetricKeyType, 'rsa');
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assert.deepStrictEqual(publicKey.asymmetricKeyDetails, {
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modulusLength: 512,
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publicExponent: 3n
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});
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assert.strictEqual(typeof privateKey, 'object');
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assert.strictEqual(privateKey.type, 'private');
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assert.strictEqual(privateKey.asymmetricKeyType, 'rsa');
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assert.deepStrictEqual(privateKey.asymmetricKeyDetails, {
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modulusLength: 512,
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publicExponent: 3n
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});
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}
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{
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// Test sync key generation with key objects.
119144
const { publicKey, privateKey } = generateKeyPairSync('rsa', {
@@ -123,10 +148,18 @@ const sec1EncExp = (cipher) => getRegExpForPEM('EC PRIVATE KEY', cipher);
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assert.strictEqual(typeof publicKey, 'object');
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assert.strictEqual(publicKey.type, 'public');
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assert.strictEqual(publicKey.asymmetricKeyType, 'rsa');
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assert.deepStrictEqual(publicKey.asymmetricKeyDetails, {
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modulusLength: 512,
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publicExponent: 65537n
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});
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assert.strictEqual(typeof privateKey, 'object');
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assert.strictEqual(privateKey.type, 'private');
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assert.strictEqual(privateKey.asymmetricKeyType, 'rsa');
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assert.deepStrictEqual(privateKey.asymmetricKeyDetails, {
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modulusLength: 512,
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publicExponent: 65537n
162+
});
130163
}
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132165
{
@@ -268,9 +301,17 @@ const sec1EncExp = (cipher) => getRegExpForPEM('EC PRIVATE KEY', cipher);
268301
}, common.mustSucceed((publicKey, privateKey) => {
269302
assert.strictEqual(publicKey.type, 'public');
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assert.strictEqual(publicKey.asymmetricKeyType, 'rsa-pss');
304+
assert.deepStrictEqual(publicKey.asymmetricKeyDetails, {
305+
modulusLength: 512,
306+
publicExponent: 65537n
307+
});
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272309
assert.strictEqual(privateKey.type, 'private');
273310
assert.strictEqual(privateKey.asymmetricKeyType, 'rsa-pss');
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assert.deepStrictEqual(privateKey.asymmetricKeyDetails, {
312+
modulusLength: 512,
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publicExponent: 65537n
314+
});
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275316
// Unlike RSA, RSA-PSS does not allow encryption.
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assert.throws(() => {
@@ -342,6 +383,28 @@ const sec1EncExp = (cipher) => getRegExpForPEM('EC PRIVATE KEY', cipher);
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}));
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}
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{
387+
// Test async DSA key object generation.
388+
generateKeyPair('dsa', {
389+
modulusLength: 512,
390+
divisorLength: 256
391+
}, common.mustSucceed((publicKey, privateKey) => {
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assert.strictEqual(publicKey.type, 'public');
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assert.strictEqual(publicKey.asymmetricKeyType, 'dsa');
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assert.deepStrictEqual(publicKey.asymmetricKeyDetails, {
395+
modulusLength: 512,
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divisorLength: 256
397+
});
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399+
assert.strictEqual(privateKey.type, 'private');
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assert.strictEqual(privateKey.asymmetricKeyType, 'dsa');
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assert.deepStrictEqual(privateKey.asymmetricKeyDetails, {
402+
modulusLength: 512,
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divisorLength: 256
404+
});
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}));
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}
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{
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// Test async elliptic curve key generation, e.g. for ECDSA, with a SEC1
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// private key.
@@ -925,16 +988,24 @@ const sec1EncExp = (cipher) => getRegExpForPEM('EC PRIVATE KEY', cipher);
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// It should recognize both NIST and standard curve names.
926989
generateKeyPair('ec', {
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namedCurve: 'P-256',
928-
publicKeyEncoding: { type: 'spki', format: 'pem' },
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privateKeyEncoding: { type: 'pkcs8', format: 'pem' }
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}, common.mustSucceed((publicKey, privateKey) => {
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assert.deepStrictEqual(publicKey.asymmetricKeyDetails, {
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namedCurve: 'prime256v1'
994+
});
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assert.deepStrictEqual(privateKey.asymmetricKeyDetails, {
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namedCurve: 'prime256v1'
997+
});
931998
}));
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9331000
generateKeyPair('ec', {
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namedCurve: 'secp256k1',
935-
publicKeyEncoding: { type: 'spki', format: 'pem' },
936-
privateKeyEncoding: { type: 'pkcs8', format: 'pem' }
9371002
}, common.mustSucceed((publicKey, privateKey) => {
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assert.deepStrictEqual(publicKey.asymmetricKeyDetails, {
1004+
namedCurve: 'secp256k1'
1005+
});
1006+
assert.deepStrictEqual(privateKey.asymmetricKeyDetails, {
1007+
namedCurve: 'secp256k1'
1008+
});
9381009
}));
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}
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@@ -945,9 +1016,11 @@ const sec1EncExp = (cipher) => getRegExpForPEM('EC PRIVATE KEY', cipher);
9451016
generateKeyPair(keyType, common.mustSucceed((publicKey, privateKey) => {
9461017
assert.strictEqual(publicKey.type, 'public');
9471018
assert.strictEqual(publicKey.asymmetricKeyType, keyType);
1019+
assert.deepStrictEqual(publicKey.asymmetricKeyDetails, {});
9481020

9491021
assert.strictEqual(privateKey.type, 'private');
9501022
assert.strictEqual(privateKey.asymmetricKeyType, keyType);
1023+
assert.deepStrictEqual(privateKey.asymmetricKeyDetails, {});
9511024
}));
9521025
});
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}

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