core_crypto/mls/session/
key_package.rs

1use std::collections::{HashMap, HashSet};
2
3use core_crypto_keystore::{
4    connection::FetchFromDatabase,
5    entities::{EntityFindParams, StoredEncryptionKeyPair, StoredHpkePrivateKey, StoredKeypackage},
6};
7use mls_crypto_provider::{Database, MlsCryptoProvider};
8use openmls::prelude::{
9    Credential as MlsCredential, CredentialWithKey, CryptoConfig, KeyPackage, KeyPackageRef, Lifetime,
10};
11use openmls_traits::OpenMlsCryptoProvider;
12use tls_codec::{Deserialize, Serialize};
13
14use super::{Error, Result};
15use crate::{
16    Ciphersuite, Credential, CredentialType, KeystoreError, MlsConversationConfiguration, MlsError, Session,
17    mls::session::SessionInner,
18};
19
20/// Default number of KeyPackages a client generates the first time it's created
21#[cfg(not(test))]
22pub const INITIAL_KEYING_MATERIAL_COUNT: usize = 100;
23/// Default number of KeyPackages a client generates the first time it's created
24#[cfg(test)]
25pub const INITIAL_KEYING_MATERIAL_COUNT: usize = 10;
26
27/// Default lifetime of all generated KeyPackages. Matches the limit defined in openmls
28pub(crate) const KEYPACKAGE_DEFAULT_LIFETIME: std::time::Duration =
29    std::time::Duration::from_secs(60 * 60 * 24 * 28 * 3); // ~3 months
30
31impl Session {
32    /// Generates a single new keypackage
33    ///
34    /// # Arguments
35    /// * `backend` - the KeyStorage to load the keypackages from
36    ///
37    /// # Errors
38    /// KeyStore and OpenMls errors
39    pub async fn generate_one_keypackage_from_credential(
40        &self,
41        backend: &MlsCryptoProvider,
42        cs: Ciphersuite,
43        cb: &Credential,
44    ) -> Result<KeyPackage> {
45        let guard = self.inner.read().await;
46        let SessionInner {
47            keypackage_lifetime, ..
48        } = guard.as_ref().ok_or(Error::MlsNotInitialized)?;
49
50        let keypackage = KeyPackage::builder()
51            .leaf_node_capabilities(MlsConversationConfiguration::default_leaf_capabilities())
52            .key_package_lifetime(Lifetime::new(keypackage_lifetime.as_secs()))
53            .build(
54                CryptoConfig {
55                    ciphersuite: cs.into(),
56                    version: openmls::versions::ProtocolVersion::default(),
57                },
58                backend,
59                &cb.signature_key_pair,
60                CredentialWithKey {
61                    credential: cb.mls_credential.clone(),
62                    signature_key: cb.signature_key_pair.public().into(),
63                },
64            )
65            .await
66            .map_err(KeystoreError::wrap("building keypackage"))?;
67
68        Ok(keypackage)
69    }
70
71    /// Requests `count` keying material to be present and returns
72    /// a reference to it for the consumer to copy/clone.
73    ///
74    /// # Arguments
75    /// * `count` - number of [openmls::key_packages::KeyPackage] to generate
76    /// * `ciphersuite` - of [openmls::key_packages::KeyPackage] to generate
77    /// * `backend` - the KeyStorage to load the keypackages from
78    ///
79    /// # Errors
80    /// KeyStore and OpenMls errors
81    pub async fn request_key_packages(
82        &self,
83        count: usize,
84        ciphersuite: Ciphersuite,
85        credential_type: CredentialType,
86        backend: &MlsCryptoProvider,
87    ) -> Result<Vec<KeyPackage>> {
88        // Auto-prune expired keypackages on request
89        self.prune_keypackages(backend, std::iter::empty()).await?;
90        use core_crypto_keystore::CryptoKeystoreMls as _;
91
92        let mut existing_kps = backend
93            .key_store()
94            .mls_fetch_keypackages::<KeyPackage>(count as u32)
95            .await.map_err(KeystoreError::wrap("fetching mls keypackages"))?
96            .into_iter()
97            // TODO: do this filtering in SQL when the schema is updated. Tracking issue: WPB-9599
98            .filter(|kp|
99                ciphersuite == kp.ciphersuite()  && credential_type == kp.leaf_node().credential().credential_type() )
100            .collect::<Vec<_>>();
101
102        let kpb_count = existing_kps.len();
103        let mut kps = if count > kpb_count {
104            let to_generate = count - kpb_count;
105            let cb = self
106                .find_most_recent_credential(ciphersuite.signature_algorithm(), credential_type)
107                .await?;
108            self.generate_new_keypackages(backend, ciphersuite, &cb, to_generate)
109                .await?
110        } else {
111            vec![]
112        };
113
114        existing_kps.reverse();
115
116        kps.append(&mut existing_kps);
117        Ok(kps)
118    }
119
120    pub(crate) async fn generate_new_keypackages(
121        &self,
122        backend: &MlsCryptoProvider,
123        ciphersuite: Ciphersuite,
124        cb: &Credential,
125        count: usize,
126    ) -> Result<Vec<KeyPackage>> {
127        let mut kps = Vec::with_capacity(count);
128
129        for _ in 0..count {
130            let kp = self
131                .generate_one_keypackage_from_credential(backend, ciphersuite, cb)
132                .await?;
133            kps.push(kp);
134        }
135
136        Ok(kps)
137    }
138
139    /// Returns the count of valid, non-expired, unclaimed keypackages in store
140    pub async fn valid_keypackages_count(
141        &self,
142        backend: &MlsCryptoProvider,
143        ciphersuite: Ciphersuite,
144        credential_type: CredentialType,
145    ) -> Result<usize> {
146        let kps: Vec<StoredKeypackage> = backend
147            .key_store()
148            .find_all(EntityFindParams::default())
149            .await
150            .map_err(KeystoreError::wrap("finding all key packages"))?;
151
152        let mut valid_count = 0;
153        for kp in kps
154            .into_iter()
155            .map(|kp| core_crypto_keystore::deser::<KeyPackage>(&kp.keypackage))
156            // TODO: do this filtering in SQL when the schema is updated. Tracking issue: WPB-9599
157            .filter(|kp_result| {
158                 kp_result.as_ref().ok().is_none_or(|key_package| ciphersuite == key_package.ciphersuite() && credential_type == key_package.leaf_node().credential().credential_type())
159            })
160        {
161            let kp = kp.map_err(KeystoreError::wrap("counting valid keypackages"))?;
162            if !Self::is_mls_keypackage_expired(&kp) {
163                valid_count += 1;
164            }
165        }
166
167        Ok(valid_count)
168    }
169
170    /// Checks if a given OpenMLS [`KeyPackage`] is expired by looking through its extensions,
171    /// finding a lifetime extension and checking if it's valid.
172    fn is_mls_keypackage_expired(kp: &KeyPackage) -> bool {
173        let Some(lifetime) = kp.leaf_node().life_time() else {
174            return false;
175        };
176
177        !(lifetime.has_acceptable_range() && lifetime.is_valid())
178    }
179
180    /// Prune the provided KeyPackageRefs from the keystore
181    ///
182    /// Warning: Despite this API being public, the caller should know what they're doing.
183    /// Provided KeypackageRefs **will** be purged regardless of their expiration state, so please be wary of what you
184    /// are doing if you directly call this API. This could result in still valid, uploaded keypackages being pruned
185    /// from the system and thus being impossible to find when referenced in a future Welcome message.
186    pub async fn prune_keypackages(
187        &self,
188        backend: &MlsCryptoProvider,
189        refs: impl IntoIterator<Item = KeyPackageRef>,
190    ) -> Result<()> {
191        let keystore = backend.keystore();
192        let kps = self.find_all_keypackages(&keystore).await?;
193        let _ = self._prune_keypackages(&kps, &keystore, refs).await?;
194        Ok(())
195    }
196
197    pub(crate) async fn prune_keypackages_and_credential(
198        &mut self,
199        backend: &MlsCryptoProvider,
200        refs: impl IntoIterator<Item = KeyPackageRef>,
201    ) -> Result<()> {
202        let mut guard = self.inner.write().await;
203        let SessionInner { identities, .. } = guard.as_mut().ok_or(Error::MlsNotInitialized)?;
204
205        let keystore = backend.key_store();
206        let kps = self.find_all_keypackages(keystore).await?;
207        let kp_to_delete = self._prune_keypackages(&kps, keystore, refs).await?;
208
209        // Let's group KeyPackages by Credential
210        let mut grouped_kps = HashMap::<Vec<u8>, Vec<KeyPackageRef>>::new();
211        for (_, kp) in &kps {
212            let cred = kp
213                .leaf_node()
214                .credential()
215                .tls_serialize_detached()
216                .map_err(Error::tls_serialize("keypackage"))?;
217            let kp_ref = kp
218                .hash_ref(backend.crypto())
219                .map_err(MlsError::wrap("computing keypackage hashref"))?;
220            grouped_kps.entry(cred).or_default().push(kp_ref);
221        }
222
223        for (credential, kps) in &grouped_kps {
224            // If all KeyPackages are to be deleted for this given Credential
225            let all_to_delete = kps.iter().all(|kpr| kp_to_delete.contains(&kpr.as_slice()));
226            if all_to_delete {
227                // then delete this Credential
228                backend
229                    .keystore()
230                    .cred_delete_by_credential(credential.clone())
231                    .await
232                    .map_err(KeystoreError::wrap("deleting credential"))?;
233                let credential = MlsCredential::tls_deserialize(&mut credential.as_slice())
234                    .map_err(Error::tls_deserialize("credential"))?;
235                identities.remove_by_mls_credential(&credential);
236            }
237        }
238
239        Ok(())
240    }
241
242    /// Deletes all expired KeyPackages plus the ones in `refs`. It also deletes all associated:
243    /// * HPKE private keys
244    /// * HPKE Encryption KeyPairs
245    /// * Signature KeyPairs & Credentials (use [Self::prune_keypackages_and_credential])
246    async fn _prune_keypackages<'a>(
247        &self,
248        kps: &'a [(StoredKeypackage, KeyPackage)],
249        keystore: &Database,
250        refs: impl IntoIterator<Item = KeyPackageRef>,
251    ) -> Result<HashSet<&'a [u8]>, Error> {
252        let refs = refs
253            .into_iter()
254            .map(|kp| {
255                // If `KeyPackageRef` implemented `Hash + PartialEq<Rhs=[u8]> + Eq`, then we could just check whether
256                // an arbitrary reference existed in the hashset without moving data here at all; the type could just
257                // be `HashSet<KeyPackageRef>`.
258                //
259                // If `KeyPackageRef` implemented `fn into_inner(self) -> Vec<u8>` then we could at least extract the
260                // data without copying.
261                //
262                // As things stand, we're stuck with some pointless copying of (usually short) data around.
263                // Hopefully LLVM is smart enough to optimize some of it away!
264                kp.as_slice().to_owned()
265            })
266            .collect::<HashSet<_>>();
267
268        let kp_to_delete = kps.iter().filter_map(|(store_kp, kp)| {
269            let is_expired = Self::is_mls_keypackage_expired(kp);
270            let to_delete = is_expired || refs.contains(store_kp.keypackage_ref.as_slice());
271            to_delete.then_some((kp, &store_kp.keypackage_ref))
272        });
273
274        // note: we're cloning the iterator here, not the data
275        for (kp, kp_ref) in kp_to_delete.clone() {
276            keystore
277                .remove::<StoredKeypackage, &[u8]>(kp_ref.as_slice())
278                .await
279                .map_err(KeystoreError::wrap("removing key package from keystore"))?;
280            keystore
281                .remove::<StoredHpkePrivateKey, &[u8]>(kp.hpke_init_key().as_slice())
282                .await
283                .map_err(KeystoreError::wrap("removing private key from keystore"))?;
284            keystore
285                .remove::<StoredEncryptionKeyPair, &[u8]>(kp.leaf_node().encryption_key().as_slice())
286                .await
287                .map_err(KeystoreError::wrap("removing encryption keypair from keystore"))?;
288        }
289
290        Ok(kp_to_delete.map(|(_, kpref)| kpref.as_slice()).collect())
291    }
292
293    pub(super) async fn find_all_keypackages(
294        &self,
295        keystore: &Database,
296    ) -> Result<Vec<(StoredKeypackage, KeyPackage)>> {
297        let kps: Vec<StoredKeypackage> = keystore
298            .find_all(EntityFindParams::default())
299            .await
300            .map_err(KeystoreError::wrap("finding all keypackages"))?;
301
302        let kps = kps
303            .into_iter()
304            .map(|raw_kp| -> Result<_> {
305                let kp = core_crypto_keystore::deser::<KeyPackage>(&raw_kp.keypackage)
306                    .map_err(KeystoreError::wrap("deserializing keypackage"))?;
307                Ok((raw_kp, kp))
308            })
309            .collect::<Result<Vec<_>, _>>()?;
310
311        Ok(kps)
312    }
313
314    /// Allows to set the current default keypackage lifetime extension duration.
315    /// It will be embedded in the [openmls::key_packages::KeyPackage]'s [openmls::extensions::LifetimeExtension]
316    #[cfg(test)]
317    pub async fn set_keypackage_lifetime(&self, duration: std::time::Duration) -> Result<()> {
318        match &mut *self.inner.write().await {
319            None => Err(Error::MlsNotInitialized),
320            Some(SessionInner {
321                keypackage_lifetime, ..
322            }) => {
323                *keypackage_lifetime = duration;
324                Ok(())
325            }
326        }
327    }
328}
329
330#[cfg(test)]
331mod tests {
332    use core_crypto_keystore::{ConnectionType, DatabaseKey};
333    use mls_crypto_provider::{Database, MlsCryptoProvider};
334    use openmls::prelude::{KeyPackage, KeyPackageIn, KeyPackageRef, ProtocolVersion};
335    use openmls_traits::{OpenMlsCryptoProvider, types::VerifiableCiphersuite};
336
337    use super::Session;
338    use crate::{
339        MlsConversationConfiguration,
340        e2e_identity::enrollment::test_utils::{e2ei_enrollment, init_activation_or_rotation, noop_restore},
341        test_utils::*,
342    };
343
344    #[apply(all_cred_cipher)]
345    async fn can_assess_keypackage_expiration(case: TestContext) {
346        let [session_context] = case.sessions().await;
347        let (cs, ct) = (case.ciphersuite(), case.credential_type);
348        let key = DatabaseKey::generate();
349        let database = Database::open(ConnectionType::InMemory, &key).await.unwrap();
350        let backend = MlsCryptoProvider::new(database);
351        let x509_test_chain = if case.is_x509() {
352            let x509_test_chain = crate::test_utils::x509::X509TestChain::init_empty(case.signature_scheme());
353            x509_test_chain.register_with_provider(&backend).await;
354            Some(x509_test_chain)
355        } else {
356            None
357        };
358
359        backend.new_transaction().await.unwrap();
360        let session = session_context.session;
361        session
362            .random_generate(
363                &case,
364                x509_test_chain.as_ref().map(|chain| chain.find_local_intermediate_ca()),
365            )
366            .await
367            .unwrap();
368
369        // 90-day standard expiration
370        let kp_std_exp = session.generate_one_keypackage(&backend, cs, ct).await.unwrap();
371        assert!(!Session::is_mls_keypackage_expired(&kp_std_exp));
372
373        // 1-second expiration
374        session
375            .set_keypackage_lifetime(std::time::Duration::from_secs(1))
376            .await
377            .unwrap();
378        let kp_1s_exp = session.generate_one_keypackage(&backend, cs, ct).await.unwrap();
379        // Sleep 2 seconds to make sure we make the kp expire
380        smol::Timer::after(std::time::Duration::from_secs(2)).await;
381        assert!(Session::is_mls_keypackage_expired(&kp_1s_exp));
382    }
383
384    #[apply(all_cred_cipher)]
385    async fn requesting_x509_key_packages_after_basic(case: TestContext) {
386        // Basic test case
387        if !case.is_basic() {
388            return;
389        }
390
391        let [session_context] = case.sessions_basic_with_pki_env().await;
392        Box::pin(async move {
393            let signature_scheme = case.signature_scheme();
394            let cipher_suite = case.ciphersuite();
395
396            // Generate 5 Basic key packages first
397            let _basic_key_packages = session_context
398                .transaction
399                .get_or_create_client_keypackages(cipher_suite, CredentialType::Basic, 5)
400                .await
401                .unwrap();
402
403            // Set up E2E identity
404            let test_chain = session_context.x509_chain_unchecked();
405
406            let (mut enrollment, cert_chain) = e2ei_enrollment(
407                &session_context,
408                &case,
409                test_chain,
410                None,
411                false,
412                init_activation_or_rotation,
413                noop_restore,
414            )
415            .await
416            .unwrap();
417
418            let _rotate_bundle = session_context
419                .transaction
420                .save_x509_credential(&mut enrollment, cert_chain)
421                .await
422                .unwrap();
423
424            // E2E identity has been set up correctly
425            assert!(
426                session_context
427                    .transaction
428                    .e2ei_is_enabled(signature_scheme)
429                    .await
430                    .unwrap()
431            );
432
433            // Request X509 key packages
434            let x509_key_packages = session_context
435                .transaction
436                .get_or_create_client_keypackages(cipher_suite, CredentialType::X509, 5)
437                .await
438                .unwrap();
439
440            // Verify that the key packages are X509
441            assert!(
442                x509_key_packages
443                    .iter()
444                    .all(|kp| CredentialType::X509 == kp.leaf_node().credential().credential_type())
445            );
446        })
447        .await
448    }
449
450    #[apply(all_cred_cipher)]
451    async fn generates_correct_number_of_kpbs(case: TestContext) {
452        let [cc] = case.sessions().await;
453        Box::pin(async move {
454            const N: usize = 2;
455            const COUNT: usize = 109;
456
457            let init = cc.transaction.count_entities().await;
458            assert_eq!(init.key_package, 0);
459            assert_eq!(init.encryption_keypair, 0);
460            assert_eq!(init.hpke_private_key, 0);
461            assert_eq!(init.credential, 1);
462
463            // since 'delete_keypackages' will evict all Credentials unlinked to a KeyPackage, each iteration
464            // generates 1 extra KeyPackage in order for this Credential no to be evicted and next iteration sto
465            // succeed.
466            let transactional_provider = cc.transaction.mls_provider().await.unwrap();
467            let crypto_provider = transactional_provider.crypto();
468            let mut pinned_kp = None;
469
470            let mut prev_kps: Option<Vec<KeyPackage>> = None;
471            for _ in 0..N {
472                let mut kps = cc
473                    .transaction
474                    .get_or_create_client_keypackages(case.ciphersuite(), case.credential_type, COUNT + 1)
475                    .await
476                    .unwrap();
477
478                // this will always be the same, first KeyPackage
479                pinned_kp = Some(kps.pop().unwrap());
480
481                assert_eq!(kps.len(), COUNT);
482                let after_creation = cc.transaction.count_entities().await;
483                assert_eq!(after_creation.key_package, COUNT + 1);
484                assert_eq!(after_creation.encryption_keypair, COUNT + 1);
485                assert_eq!(after_creation.hpke_private_key, COUNT + 1);
486                assert_eq!(after_creation.credential, 1);
487
488                let kpbs_refs = kps
489                    .iter()
490                    .map(|kp| kp.hash_ref(crypto_provider).unwrap())
491                    .collect::<Vec<KeyPackageRef>>();
492
493                if let Some(pkpbs) = prev_kps.replace(kps) {
494                    let pkpbs_refs = pkpbs
495                        .into_iter()
496                        .map(|kpb| kpb.hash_ref(crypto_provider).unwrap())
497                        .collect::<Vec<KeyPackageRef>>();
498
499                    let has_duplicates = kpbs_refs.iter().any(|href| pkpbs_refs.contains(href));
500                    // Make sure we have no previous keypackages found (that were pruned) in our new batch of KPs
501                    assert!(!has_duplicates);
502                }
503                cc.transaction.delete_keypackages(kpbs_refs).await.unwrap();
504            }
505
506            let count = cc
507                .transaction
508                .client_valid_key_packages_count(case.ciphersuite(), case.credential_type)
509                .await
510                .unwrap();
511            assert_eq!(count, 1);
512
513            let pinned_kpr = pinned_kp.unwrap().hash_ref(crypto_provider).unwrap();
514            cc.transaction.delete_keypackages([pinned_kpr]).await.unwrap();
515            let count = cc
516                .transaction
517                .client_valid_key_packages_count(case.ciphersuite(), case.credential_type)
518                .await
519                .unwrap();
520            assert_eq!(count, 0);
521            let after_delete = cc.transaction.count_entities().await;
522            assert_eq!(after_delete.key_package, 0);
523            assert_eq!(after_delete.encryption_keypair, 0);
524            assert_eq!(after_delete.hpke_private_key, 0);
525            assert_eq!(after_delete.credential, 0);
526        })
527        .await
528    }
529
530    #[apply(all_cred_cipher)]
531    async fn automatically_prunes_lifetime_expired_keypackages(case: TestContext) {
532        let [session_context] = case.sessions().await;
533        const UNEXPIRED_COUNT: usize = 125;
534        const EXPIRED_COUNT: usize = 200;
535        let key = DatabaseKey::generate();
536        let key_store = Database::open(ConnectionType::InMemory, &key).await.unwrap();
537        let backend = MlsCryptoProvider::new(key_store);
538        let x509_test_chain = if case.is_x509() {
539            let x509_test_chain = crate::test_utils::x509::X509TestChain::init_empty(case.signature_scheme());
540            x509_test_chain.register_with_provider(&backend).await;
541            Some(x509_test_chain)
542        } else {
543            None
544        };
545        backend.new_transaction().await.unwrap();
546        let session = session_context.session().await;
547        session
548            .random_generate(
549                &case,
550                x509_test_chain.as_ref().map(|chain| chain.find_local_intermediate_ca()),
551            )
552            .await
553            .unwrap();
554
555        // Generate `UNEXPIRED_COUNT` kpbs that are with default 3 months expiration. We *should* keep them for the
556        // duration of the test
557        let unexpired_kpbs = session
558            .request_key_packages(UNEXPIRED_COUNT, case.ciphersuite(), case.credential_type, &backend)
559            .await
560            .unwrap();
561        let len = session
562            .valid_keypackages_count(&backend, case.ciphersuite(), case.credential_type)
563            .await
564            .unwrap();
565        assert_eq!(len, unexpired_kpbs.len());
566        assert_eq!(len, UNEXPIRED_COUNT);
567
568        // Set the keypackage expiration to be in 2 seconds
569        session
570            .set_keypackage_lifetime(std::time::Duration::from_secs(10))
571            .await
572            .unwrap();
573
574        // Generate new keypackages that are normally partially expired 2s after they're requested
575        let partially_expired_kpbs = session
576            .request_key_packages(EXPIRED_COUNT, case.ciphersuite(), case.credential_type, &backend)
577            .await
578            .unwrap();
579        assert_eq!(partially_expired_kpbs.len(), EXPIRED_COUNT);
580
581        // Sleep to trigger the expiration
582        smol::Timer::after(std::time::Duration::from_secs(10)).await;
583
584        // Request the same number of keypackages. The automatic lifetime-based expiration should take
585        // place and remove old expired keypackages and generate fresh ones instead
586        let fresh_kpbs = session
587            .request_key_packages(EXPIRED_COUNT, case.ciphersuite(), case.credential_type, &backend)
588            .await
589            .unwrap();
590        let len = session
591            .valid_keypackages_count(&backend, case.ciphersuite(), case.credential_type)
592            .await
593            .unwrap();
594        assert_eq!(len, fresh_kpbs.len());
595        assert_eq!(len, EXPIRED_COUNT);
596
597        // Try to deep compare and find kps matching expired and non-expired ones
598        let (unexpired_match, expired_match) =
599            fresh_kpbs
600                .iter()
601                .fold((0usize, 0usize), |(mut unexpired_match, mut expired_match), fresh| {
602                    if unexpired_kpbs.iter().any(|kp| kp == fresh) {
603                        unexpired_match += 1;
604                    } else if partially_expired_kpbs.iter().any(|kpb| kpb == fresh) {
605                        expired_match += 1;
606                    }
607
608                    (unexpired_match, expired_match)
609                });
610
611        // TADA!
612        assert_eq!(unexpired_match, UNEXPIRED_COUNT);
613        assert_eq!(expired_match, 0);
614    }
615
616    #[apply(all_cred_cipher)]
617    async fn new_keypackage_has_correct_extensions(case: TestContext) {
618        let [cc] = case.sessions().await;
619        Box::pin(async move {
620            let kps = cc
621                .transaction
622                .get_or_create_client_keypackages(case.ciphersuite(), case.credential_type, 1)
623                .await
624                .unwrap();
625            let kp = kps.first().unwrap();
626
627            // make sure it's valid
628            let _ = KeyPackageIn::from(kp.clone())
629                .standalone_validate(
630                    &cc.transaction.mls_provider().await.unwrap(),
631                    ProtocolVersion::Mls10,
632                    true,
633                )
634                .await
635                .unwrap();
636
637            // see https://www.rfc-editor.org/rfc/rfc9420.html#section-10-10
638            assert!(kp.extensions().is_empty());
639
640            assert_eq!(kp.leaf_node().capabilities().versions(), &[ProtocolVersion::Mls10]);
641            assert_eq!(
642                kp.leaf_node().capabilities().ciphersuites().to_vec(),
643                MlsConversationConfiguration::DEFAULT_SUPPORTED_CIPHERSUITES
644                    .iter()
645                    .map(|c| VerifiableCiphersuite::from(*c))
646                    .collect::<Vec<_>>()
647            );
648            assert!(kp.leaf_node().capabilities().proposals().is_empty());
649            assert!(kp.leaf_node().capabilities().extensions().is_empty());
650            assert_eq!(
651                kp.leaf_node().capabilities().credentials(),
652                MlsConversationConfiguration::DEFAULT_SUPPORTED_CREDENTIALS
653            );
654        })
655        .await
656    }
657}
core_crypto/mls/session/key_package.rs

core_crypto/mls/session/
key_package.rs
