runtime-sdk/src/modules/core: add "core.PublicKey" call

runtime-sdk/src/modules/core/mod.rs

@@ -427,6 +427,8 @@ pub trait Config: 'static {
     const GAS_COST_CALL_CALLDATA_PUBLIC_KEY: u64 = 20;
     /// The gas cost of the internal call to retrieve the current epoch.
     const GAS_COST_CALL_CURRENT_EPOCH: u64 = 10;
+    /// The gas cost of the internal call to retrieve the current long-term public key
+    const GAS_COST_CALL_PUBLIC_KEY: u64 = 20;
 }
 
 pub struct Module<Cfg: Config> {
@@ -846,6 +848,23 @@ impl<Cfg: Config> Module<Cfg> {
         <C::Runtime as Runtime>::Modules::check_invariants(ctx)
     }
 
+    fn public_key_common<C: Context>(ctx: &C) -> Result<types::PublicKeyQueryResponse, Error> {
+        let key_manager = ctx
+            .key_manager()
+            .ok_or_else(|| Error::InvalidArgument(anyhow!("key manager not available")))?;
+        let epoch = ctx.epoch();
+        let key_pair_id = callformat::get_key_pair_id(epoch);
+        let public_key = key_manager
+            .get_public_key(key_pair_id)
+            .map_err(|_| Error::InvalidArgument(anyhow!("cannot get public key")))?;
+        let runtime_id = *ctx.runtime_id();
+        Ok(types::PublicKeyQueryResponse {
+            runtime_id,
+            key_pair_id,
+            public_key,
+        })
+    }
+
     fn calldata_public_key_common<C: Context>(
         ctx: &C,
     ) -> Result<types::CallDataPublicKeyQueryResponse, Error> {
@@ -865,6 +884,25 @@ impl<Cfg: Config> Module<Cfg> {
         Ok(types::CallDataPublicKeyQueryResponse { public_key, epoch })
     }
 
+    /// Retrieve the public key for encrypting call data.
+    #[handler(query = "core.PublicKey")]
+    fn query_public_key<C: Context>(
+        ctx: &C,
+        _args: (),
+    ) -> Result<types::PublicKeyQueryResponse, Error> {
+        Self::public_key_common(ctx)
+    }
+
+    /// Retrieve the public key for encrypting call data (internally exposed call).
+    #[handler(call = "core.PublicKey", internal)]
+    fn internal_public_key<C: Context>(
+        ctx: &C,
+        _args: (),
+    ) -> Result<types::PublicKeyQueryResponse, Error> {
+        <C::Runtime as Runtime>::Core::use_tx_gas(Cfg::GAS_COST_CALL_CALLDATA_PUBLIC_KEY)?;
+        Self::public_key_common(ctx)
+    }
+
     /// Retrieve the public key for encrypting call data.
     #[handler(query = "core.CallDataPublicKey")]
     fn query_calldata_public_key<C: Context>(

runtime-sdk/src/modules/core/test.rs

@@ -1174,6 +1174,8 @@ fn test_module_info() {
                         methods: vec![
                             MethodHandlerInfo { kind: MethodHandlerKind::Query, name: "core.EstimateGas".to_string() },
                             MethodHandlerInfo { kind: MethodHandlerKind::Query, name: "core.CheckInvariants".to_string() },
+                            MethodHandlerInfo { kind: MethodHandlerKind::Query, name: "core.PublicKey".to_string() },
+                            MethodHandlerInfo { kind: MethodHandlerKind::Call, name: "core.PublicKey".to_string() },
                             MethodHandlerInfo { kind: MethodHandlerKind::Query, name: "core.CallDataPublicKey".to_string() },
                             MethodHandlerInfo { kind: MethodHandlerKind::Call, name: "core.CallDataPublicKey".to_string() },
                             MethodHandlerInfo { kind: MethodHandlerKind::Call, name: "core.CurrentEpoch".to_string() },

runtime-sdk/src/modules/core/types.rs

@@ -1,10 +1,13 @@
 use std::collections::BTreeMap;
 
 use crate::{
+    core::common::namespace::Namespace,
     keymanager::SignedPublicKey,
     types::transaction::{CallResult, CallerAddress, Transaction},
 };
 
+use oasis_core_keymanager::crypto::KeyPairId;
+
 /// Key in the versions map used for the global state version.
 pub const VERSION_GLOBAL_KEY: &str = "";
 
@@ -41,6 +44,17 @@ pub struct CallDataPublicKeyQueryResponse {
     pub epoch: u64,
 }
 
+/// Response to the public key query.
+#[derive(Clone, Debug, Default, cbor::Encode, cbor::Decode)]
+pub struct PublicKeyQueryResponse {
+    /// ID of the public key which signs the call data public keys
+    pub key_pair_id: KeyPairId,
+    /// Public key which signs the call data public keys
+    pub public_key: SignedPublicKey,
+    /// For reference, which runtime ID is this for?
+    pub runtime_id: Namespace,
+}
+
 #[derive(Debug, Copy, Clone, cbor::Encode, cbor::Decode)]
 #[cfg_attr(test, derive(PartialEq, Eq))]
 pub enum MethodHandlerKind {