#93 Add support for asymmetric keys to vault transit engine

Cargo.toml

@@ -38,6 +38,7 @@ tracing = { version = "0.1.37", features = ["log"] }
 
 [dev-dependencies]
 base64 = "0.21"
+chrono = "0.4.38"
 data-encoding = "2.3.3"
 tokio-test = "0.4.2"
 tracing-subscriber = { version = "0.3.16", default-features = false, features = ["env-filter", "fmt"] }

src/api/transit.rs

@@ -26,10 +26,14 @@ pub enum KeyType {
     /// ECDSA using the P-521 elliptic curve (asymmetric)
     EcdsaP521,
     /// RSA with bit size of 2048 (asymmetric)
+    // kebab-case conversion doesn't work for words starting with a digit.
+    #[serde(rename = "rsa-2048")]
     Rsa2048,
     /// RSA with bit size of 3072 (asymmetric)
+    #[serde(rename = "rsa-3072")]
     Rsa3072,
     /// RSA with bit size of 4096 (asymmetric)
+    #[serde(rename = "rsa-4096")]
     Rsa4096,
 }
 

src/api/transit/responses.rs

@@ -12,7 +12,8 @@ pub struct ReadKeyResponse {
     pub derived: bool,
     pub exportable: bool,
     pub allow_plaintext_backup: bool,
-    pub keys: HashMap<String, u64>,
+    /// If the key is asymmetric, the API returns the public keys
+    pub keys: ReadKeyData,
     pub min_decryption_version: u64,
     pub min_encryption_version: u64,
     pub name: String,
@@ -23,6 +24,23 @@ pub struct ReadKeyResponse {
     pub imported: Option<bool>,
 }
 
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum ReadKeyData {
+    /// A key ID integer (string) to unix timestamp.
+    Symmetric(HashMap<String, u64>),
+    /// A key ID integer (string) to public key mapping.
+    Asymmetric(HashMap<String, ReadPublicKeyEntry>),
+}
+
+#[derive(Debug, Serialize, Deserialize, Clone, PartialEq)]
+pub struct ReadPublicKeyEntry {
+    /// An ISO8601 timestamp
+    pub creation_time: String,
+    pub name: String,
+    pub public_key: String,
+}
+
 /// Response from executing
 /// [ListKeysRequest][crate::api::transit::requests::ListKeysRequest]
 #[derive(Deserialize, Debug, Serialize)]

tests/transit.rs

@@ -89,6 +89,20 @@ mod key {
         )
         .await;
         assert!(resp.is_ok());
+
+        let resp = key::create(
+            &endpoint.client,
+            &endpoint.path,
+            &endpoint.keys.asymmetric,
+            Some(
+                CreateKeyRequest::builder()
+                    .exportable(false)
+                    .derived(false)
+                    .key_type(KeyType::Rsa2048),
+            ),
+        )
+        .await;
+        assert!(resp.is_ok());
     }
 
     pub async fn test_read(endpoint: &TransitEndpoint) {
@@ -107,6 +121,31 @@ mod key {
             .unwrap();
         // requires config update first
         assert!(!&resp.deletion_allowed);
+
+        let resp = key::read(&endpoint.client, &endpoint.path, &endpoint.keys.asymmetric)
+            .await
+            .unwrap();
+        assert_eq!(&resp.name, &endpoint.keys.asymmetric);
+        assert!(matches!(&resp.key_type, KeyType::Rsa2048));
+        match &resp.keys {
+            vaultrs::api::transit::responses::ReadKeyData::Symmetric(_) => {
+                panic!("Key must be asymmetric")
+            }
+            vaultrs::api::transit::responses::ReadKeyData::Asymmetric(keys) => {
+                for (_key_id, key_metadata) in keys {
+                    let _datetime: chrono::DateTime<chrono::Utc> = key_metadata
+                        .creation_time
+                        .parse()
+                        .expect("Parse ISO8601 timestamp correctly");
+                    assert!(key_metadata
+                        .public_key
+                        .starts_with("-----BEGIN PUBLIC KEY-----\n"));
+                    assert!(key_metadata
+                        .public_key
+                        .ends_with("\n-----END PUBLIC KEY-----\n"));
+                }
+            }
+        }
     }
 
     pub async fn test_list(endpoint: &TransitEndpoint) {
@@ -418,6 +457,7 @@ pub struct TestKeys {
     pub export: String,
     pub delete: String,
     pub signing: String,
+    pub asymmetric: String,
 }
 
 pub struct TestData {
@@ -458,6 +498,7 @@ impl TransitEndpoint {
                 export: "export-key".into(),
                 delete: "delete-key".into(),
                 signing: "signing-key".into(),
+                asymmetric: "asymmetric-key".into(),
             },
             data: TestData::new("test-context", "super secret data"),
         };