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crypto: add keyObject.params for asymmetric keys #30045

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crypto: add keyObject.params for asymmetric keys #30045

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af2887c
crypto: add keyObject.params for asymmetric keys
tniessen Oct 20, 2019
ca028d9
fixup! crypto: add keyObject.params for asymmetric keys
tniessen Oct 21, 2019
bfdddd0
fixup! crypto: add keyObject.params for asymmetric keys
tniessen Oct 31, 2019
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20 changes: 20 additions & 0 deletions doc/api/crypto.md
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Expand Up @@ -1309,6 +1309,26 @@ encryption mechanism, PEM-level encryption is not supported when encrypting
a PKCS#8 key. See [RFC 5208][] for PKCS#8 encryption and [RFC 1421][] for
PKCS#1 and SEC1 encryption.

### keyObject.params
<!-- YAML
added: README
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-->

* {object}
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This property exists only on asymmetric keys. Depending on the type of the key,
this object contains information about the key. None of the information obtained
through this property can be used to uniquely identify a key or to compromise
the security of the key.

For `'rsa'` and `'rsa-pss'` keys, this object has the property `modulusLength`.

For `'dsa'` keys, this object has the properties `modulusLength` and
`divisorLength`.

For `'ec'` keys with a known curve, this object has the string property
`namedCurve`.

### keyObject.symmetricKeySize
<!-- YAML
added: v11.6.0
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6 changes: 6 additions & 0 deletions lib/internal/crypto/keys.js
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Expand Up @@ -76,12 +76,18 @@ class SecretKeyObject extends KeyObject {
}

const kAsymmetricKeyType = Symbol('kAsymmetricKeyType');
const kParams = Symbol('kParams');

class AsymmetricKeyObject extends KeyObject {
get asymmetricKeyType() {
return this[kAsymmetricKeyType] ||
(this[kAsymmetricKeyType] = this[kHandle].getAsymmetricKeyType());
}

get params() {
return this[kParams] ||
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Nit, but could you rewrite this as:

if (this[kParams] === undefined)
  this[kParams] = this[kHandle].getAsymmetricParams();
return this[kParams];

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I was going to suggest something similar at first but it's locally consistent, get asymmetricKeyType() uses the same style.

(this[kParams] = this[kHandle].getAsymmetricParams());
}
}

class PublicKeyObject extends AsymmetricKeyObject {
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69 changes: 69 additions & 0 deletions src/node_crypto.cc
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Expand Up @@ -3761,6 +3761,8 @@ Local<Function> KeyObject::Initialize(Environment* env, Local<Object> target) {
GetSymmetricKeySize);
env->SetProtoMethodNoSideEffect(t, "getAsymmetricKeyType",
GetAsymmetricKeyType);
env->SetProtoMethodNoSideEffect(t, "getAsymmetricParams",
GetAsymmetricParams);
env->SetProtoMethod(t, "export", Export);

auto function = t->GetFunction(env->context()).ToLocalChecked();
Expand Down Expand Up @@ -3912,6 +3914,73 @@ void KeyObject::GetAsymmetricKeyType(const FunctionCallbackInfo<Value>& args) {
args.GetReturnValue().Set(key->GetAsymmetricKeyType());
}

static inline void SetParam(Environment* env, Local<Object> params,
const char* key, Local<Value> value) {
bool ok = params->DefineOwnProperty(
env->context(),
String::NewFromUtf8(env->isolate(), key, NewStringType::kNormal)
.ToLocalChecked(),
value,
PropertyAttribute::ReadOnly).ToChecked();
CHECK(ok);
}

Local<Value> KeyObject::GetAsymmetricParams() const {
CHECK_NE(this->key_type_, kKeyTypeSecret);

Local<Object> params = Object::New(env()->isolate());
EVP_PKEY* pkey = this->asymmetric_key_.get();
RSA* rsa;
DSA* dsa;
EC_KEY* ec;
const EC_GROUP* ec_group;
int ec_curve_id;
const char* ec_curve_name;

switch (EVP_PKEY_id(pkey)) {
case EVP_PKEY_RSA_PSS:
// TODO(tniessen): Also retrieve additional PSS params as soon as OpenSSL
// provides a way to do that.
case EVP_PKEY_RSA:
// TODO(tniessen): This should really be EVP_PKEY_get0_RSA, but OpenSSL does
// not support that for RSA-PSS.
rsa = reinterpret_cast<RSA*>(EVP_PKEY_get0(pkey));
SetParam(env(), params, "modulusLength",
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Suggestion: add the string to PER_ISOLATE_STRING_PROPERTIES in env.h. Ditto the other strings.

Integer::New(env()->isolate(), RSA_bits(rsa)));
// TODO(tniessen): Add publicExponent.
break;
return env()->crypto_rsa_pss_string();
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case EVP_PKEY_DSA:
dsa = EVP_PKEY_get0_DSA(pkey);
SetParam(env(), params, "modulusLength",
Integer::New(env()->isolate(), DSA_bits(dsa)));
SetParam(env(), params, "divisorLength",
Integer::New(env()->isolate(), BN_num_bits(DSA_get0_q(dsa))));
break;
case EVP_PKEY_EC:
ec = EVP_PKEY_get0_EC_KEY(pkey);
ec_group = EC_KEY_get0_group(ec);
ec_curve_id = EC_GROUP_get_curve_name(ec_group);
if (ec_curve_id != 0) {
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ec_curve_name = OBJ_nid2sn(ec_curve_id);
if (ec_curve_name != nullptr) {
SetParam(env(), params, "namedCurve",
String::NewFromUtf8(env()->isolate(), ec_curve_name,
NewStringType::kNormal).ToLocalChecked());
}
}
break;
}
return params;
}
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void KeyObject::GetAsymmetricParams(const FunctionCallbackInfo<Value>& args) {
KeyObject* key;
ASSIGN_OR_RETURN_UNWRAP(&key, args.Holder());

args.GetReturnValue().Set(key->GetAsymmetricParams());
}

void KeyObject::GetSymmetricKeySize(const FunctionCallbackInfo<Value>& args) {
KeyObject* key;
ASSIGN_OR_RETURN_UNWRAP(&key, args.Holder());
Expand Down
3 changes: 3 additions & 0 deletions src/node_crypto.h
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Expand Up @@ -440,6 +440,9 @@ class KeyObject : public BaseObject {
static void GetAsymmetricKeyType(
const v8::FunctionCallbackInfo<v8::Value>& args);
v8::Local<v8::Value> GetAsymmetricKeyType() const;
static void GetAsymmetricParams(
const v8::FunctionCallbackInfo<v8::Value>& args);
v8::Local<v8::Value> GetAsymmetricParams() const;

static void GetSymmetricKeySize(
const v8::FunctionCallbackInfo<v8::Value>& args);
Expand Down
10 changes: 9 additions & 1 deletion test/parallel/test-crypto-key-objects.js
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Expand Up @@ -120,17 +120,20 @@ const privateDsa = fixtures.readKey('dsa_private_encrypted_1025.pem',
assert.strictEqual(publicKey.type, 'public');
assert.strictEqual(publicKey.asymmetricKeyType, 'rsa');
assert.strictEqual(publicKey.symmetricKeySize, undefined);
assert.strictEqual(publicKey.params.modulusLength, 2048);

const privateKey = createPrivateKey(privatePem);
assert.strictEqual(privateKey.type, 'private');
assert.strictEqual(privateKey.asymmetricKeyType, 'rsa');
assert.strictEqual(privateKey.symmetricKeySize, undefined);
assert.strictEqual(privateKey.params.modulusLength, 2048);

// It should be possible to derive a public key from a private key.
const derivedPublicKey = createPublicKey(privateKey);
assert.strictEqual(derivedPublicKey.type, 'public');
assert.strictEqual(derivedPublicKey.asymmetricKeyType, 'rsa');
assert.strictEqual(derivedPublicKey.symmetricKeySize, undefined);
assert.strictEqual(derivedPublicKey.params.modulusLength, 2048);

// Test exporting with an invalid options object, this should throw.
for (const opt of [undefined, null, 'foo', 0, NaN]) {
Expand Down Expand Up @@ -293,6 +296,8 @@ const privateDsa = fixtures.readKey('dsa_private_encrypted_1025.pem',
assert.strictEqual(publicKey.type, 'public');
assert.strictEqual(publicKey.asymmetricKeyType, 'dsa');
assert.strictEqual(publicKey.symmetricKeySize, undefined);
assert.strictEqual(publicKey.params.modulusLength, 1088);
assert.strictEqual(publicKey.params.divisorLength, 160);

const privateKey = createPrivateKey({
key: privateDsa,
Expand All @@ -302,7 +307,8 @@ const privateDsa = fixtures.readKey('dsa_private_encrypted_1025.pem',
assert.strictEqual(privateKey.type, 'private');
assert.strictEqual(privateKey.asymmetricKeyType, 'dsa');
assert.strictEqual(privateKey.symmetricKeySize, undefined);

assert.strictEqual(privateKey.params.modulusLength, 1088);
assert.strictEqual(privateKey.params.divisorLength, 160);
}

{
Expand All @@ -318,9 +324,11 @@ const privateDsa = fixtures.readKey('dsa_private_encrypted_1025.pem',

assert.strictEqual(publicKey.type, 'public');
assert.strictEqual(publicKey.asymmetricKeyType, 'rsa-pss');
assert.strictEqual(publicKey.params.modulusLength, 2048);

assert.strictEqual(privateKey.type, 'private');
assert.strictEqual(privateKey.asymmetricKeyType, 'rsa-pss');
assert.strictEqual(privateKey.params.modulusLength, 2048);

for (const key of [privatePem, privateKey]) {
// Any algorithm should work.
Expand Down
20 changes: 20 additions & 0 deletions test/parallel/test-crypto-keygen.js
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Expand Up @@ -122,10 +122,12 @@ const sec1EncExp = (cipher) => getRegExpForPEM('EC PRIVATE KEY', cipher);
assert.strictEqual(typeof publicKey, 'object');
assert.strictEqual(publicKey.type, 'public');
assert.strictEqual(publicKey.asymmetricKeyType, 'rsa');
assert.strictEqual(publicKey.params.modulusLength, 512);

assert.strictEqual(typeof privateKey, 'object');
assert.strictEqual(privateKey.type, 'private');
assert.strictEqual(privateKey.asymmetricKeyType, 'rsa');
assert.strictEqual(privateKey.params.modulusLength, 512);
}

{
Expand Down Expand Up @@ -465,6 +467,22 @@ const sec1EncExp = (cipher) => getRegExpForPEM('EC PRIVATE KEY', cipher);

testSignVerify(publicKey, { key: privateKey, passphrase: 'secret' });
}));

generateKeyPair('ec', {
namedCurve: 'secp521r1'
}, common.mustCall((err, publicKey, privateKey) => {
assert.ifError(err);

assert.strictEqual(publicKey.type, 'public');
assert.strictEqual(publicKey.asymmetricKeyType, 'ec');
assert.strictEqual(publicKey.params.namedCurve, 'secp521r1');

assert.strictEqual(privateKey.type, 'private');
assert.strictEqual(privateKey.asymmetricKeyType, 'ec');
assert.strictEqual(privateKey.params.namedCurve, 'secp521r1');

testSignVerify(publicKey, privateKey);
}));
}

{
Expand Down Expand Up @@ -643,6 +661,7 @@ const sec1EncExp = (cipher) => getRegExpForPEM('EC PRIVATE KEY', cipher);
assert.strictEqual(typeof publicKey, 'object');
assert.strictEqual(publicKey.type, 'public');
assert.strictEqual(publicKey.asymmetricKeyType, 'rsa');
assert.strictEqual(publicKey.params.modulusLength, 1024);

// The private key should still be a string.
assert.strictEqual(typeof privateKey, 'string');
Expand All @@ -667,6 +686,7 @@ const sec1EncExp = (cipher) => getRegExpForPEM('EC PRIVATE KEY', cipher);
assert.strictEqual(typeof privateKey, 'object');
assert.strictEqual(privateKey.type, 'private');
assert.strictEqual(privateKey.asymmetricKeyType, 'rsa');
assert.strictEqual(privateKey.params.modulusLength, 1024);

testEncryptDecrypt(publicKey, privateKey);
testSignVerify(publicKey, privateKey);
Expand Down