signatures: Add test to check reproducibility of signatures

crates/ruma-signatures/Cargo.toml

@@ -33,3 +33,4 @@ thiserror = { workspace = true }
 
 [dev-dependencies]
 assert_matches2 = { workspace = true }
+insta = "1.31.0"

crates/ruma-signatures/tests/snapshots/tests__verify_event_check_signatures_for_authorized_user.snap

@@ -0,0 +1,5 @@
+---
+source: crates/ruma-signatures/tests/tests.rs
+expression: signature
+---
+k9EFMDj9rmGt+BECNS1U/bU39/Bqc7Rm/U7PzQNk7DHFAYM8EK3lJTQr1R6hZxTHNtJuiRFDZYwBPzRgs54SDg

crates/ruma-signatures/tests/tests.rs

@@ -0,0 +1,57 @@
+use std::collections::BTreeMap;
+
+use ruma_common::{serde::Base64, RoomVersionId, ServerSigningKeyId, SigningKeyAlgorithm};
+use ruma_signatures::{sign_json, verify_event, Ed25519KeyPair, PublicKeyMap, Verified};
+
+static PKCS8_ED25519_DER: &[u8] = include_bytes!("./keys/ed25519.der");
+
+fn add_key_to_map(public_key_map: &mut PublicKeyMap, name: &str, pair: &Ed25519KeyPair) {
+    let sender_key_map = public_key_map.entry(name.to_owned()).or_default();
+    let encoded_public_key = Base64::new(pair.public_key().to_owned());
+    let version = ServerSigningKeyId::from_parts(
+        SigningKeyAlgorithm::Ed25519,
+        pair.version().try_into().unwrap(),
+    );
+
+    sender_key_map.insert(version.to_string(), encoded_public_key);
+}
+
+#[test]
+fn verify_event_check_signatures_for_authorized_user() {
+    let keypair = Ed25519KeyPair::from_der(PKCS8_ED25519_DER, "1".to_owned()).unwrap();
+
+    let mut signed_event = serde_json::from_str(
+        r#"{
+            "event_id": "$event_id:domain-event",
+            "auth_events": [],
+            "content": {},
+            "depth": 3,
+            "hashes": {
+                "sha256": "5jM4wQpv6lnBo7CLIghJuHdW+s2CMBJPUOGOC89ncos"
+            },
+            "origin": "domain",
+            "origin_server_ts": 1000000,
+            "prev_events": [],
+            "room_id": "!x:domain",
+            "sender": "@name:domain-sender",
+            "type": "m.room.member",
+            "unsigned": {
+                "age_ts": 1000000
+            }
+        }"#,
+    )
+    .unwrap();
+    sign_json("domain-sender", &keypair, &mut signed_event).unwrap();
+
+    let mut public_key_map = BTreeMap::new();
+    add_key_to_map(&mut public_key_map, "domain-sender", &keypair);
+
+    let verification = verify_event(&public_key_map, &signed_event, &RoomVersionId::V9).unwrap();
+
+    assert_eq!(verification, Verified::Signatures);
+
+    let signatures = signed_event.get("signatures").unwrap().as_object().unwrap();
+    let domain_sender_signatures = signatures.get("domain-sender").unwrap().as_object().unwrap();
+    let signature = domain_sender_signatures.get("ed25519:1").unwrap().as_str().unwrap();
+    insta::assert_snapshot!(signature);
+}