Gloas process execution payload bid (#8355)

* add proces_execution_bid

* add has_builder_withdrawal_credential

* process_execution_payload_bid signature is infinity check for self-build

* process_execution_payload_bid updates per consensus spec v1.6.0-beta.1 release

* process_execution_bid to avoid expensive lookups for 0 amount bids

* verify builder not slashed even for self-building

consensus/state_processing/src/per_block_processing/signature_sets.rs

@@ -11,9 +11,9 @@ use types::{
     BeaconStateError, ChainSpec, DepositData, Domain, Epoch, EthSpec, Fork, Hash256,
     InconsistentFork, IndexedAttestation, IndexedAttestationRef, ProposerSlashing, PublicKey,
     PublicKeyBytes, Signature, SignedAggregateAndProof, SignedBeaconBlock, SignedBeaconBlockHeader,
-    SignedBlsToExecutionChange, SignedContributionAndProof, SignedExecutionPayloadEnvelope,
-    SignedRoot, SignedVoluntaryExit, SigningData, Slot, SyncAggregate, SyncAggregatorSelectionData,
-    Unsigned,
+    SignedBlsToExecutionChange, SignedContributionAndProof, SignedExecutionPayloadBid,
+    SignedExecutionPayloadEnvelope, SignedRoot, SignedVoluntaryExit, SigningData, Slot,
+    SyncAggregate, SyncAggregatorSelectionData, Unsigned,
 };
 
 pub type Result<T> = std::result::Result<T, Error>;
@@ -360,6 +360,34 @@ where
     ))
 }
 
+pub fn execution_payload_bid_signature_set<'a, E, F>(
+    state: &'a BeaconState<E>,
+    get_pubkey: F,
+    signed_execution_payload_bid: &'a SignedExecutionPayloadBid,
+    spec: &'a ChainSpec,
+) -> Result<SignatureSet<'a>>
+where
+    E: EthSpec,
+    F: Fn(usize) -> Option<Cow<'a, PublicKey>>,
+{
+    let domain = spec.get_domain(
+        state.current_epoch(),
+        Domain::BeaconBuilder,
+        &state.fork(),
+        state.genesis_validators_root(),
+    );
+    let execution_payload_bid = &signed_execution_payload_bid.message;
+    let pubkey = get_pubkey(execution_payload_bid.builder_index as usize)
+        .ok_or(Error::ValidatorUnknown(execution_payload_bid.builder_index))?;
+    let message = execution_payload_bid.signing_root(domain);
+
+    Ok(SignatureSet::single_pubkey(
+        &signed_execution_payload_bid.signature,
+        pubkey,
+        message,
+    ))
+}
+
 /// Returns the signature set for the given `attester_slashing` and corresponding `pubkeys`.
 pub fn attester_slashing_signature_sets<'a, E, F>(
     state: &'a BeaconState<E>,