feat(ssz): convert forkdata to peters lib

mod/consensus-types/pkg/types/fork_data.go

@@ -24,6 +24,7 @@ import (
 	"github.com/berachain/beacon-kit/mod/errors"
 	"github.com/berachain/beacon-kit/mod/primitives/pkg/common"
 	"github.com/berachain/beacon-kit/mod/primitives/pkg/math"
+	"github.com/karalabe/ssz"
 )
 
 // ForkData as defined in the Ethereum 2.0 specification:
@@ -55,6 +56,40 @@ func (fd *ForkData) New(
 	return NewForkData(currentVersion, genesisValidatorsRoot)
 }
 
+// SizeSSZ returns the size of the SigningData object in SSZ encoding.
+func (*ForkData) SizeSSZ() uint32 {
+	//nolint:mnd // 32+4 = 36.
+	return 36
+}
+
+// DefineSSZ defines the SSZ encoding for the ForkData object.
+func (fd *ForkData) DefineSSZ(codec *ssz.Codec) {
+	ssz.DefineStaticBytes(codec, &fd.CurrentVersion)
+	ssz.DefineStaticBytes(codec, &fd.GenesisValidatorsRoot)
+}
+
+// HashTreeRoot computes the SSZ hash tree root of the ForkData object.
+func (fd *ForkData) HashTreeRoot() ([32]byte, error) {
+	return ssz.HashSequential(fd), nil
+}
+
+// MarshalSSZTo marshals the ForkData object to SSZ format into the provided
+// buffer.
+func (fd *ForkData) MarshalSSZTo(buf []byte) ([]byte, error) {
+	return buf, ssz.EncodeToBytes(buf, fd)
+}
+
+// MarshalSSZ marshals the ForkData object to SSZ format.
+func (fd *ForkData) MarshalSSZ() ([]byte, error) {
+	buf := make([]byte, fd.SizeSSZ())
+	return fd.MarshalSSZTo(buf)
+}
+
+// UnmarshalSSZ unmarshals the ForkData object from SSZ format.
+func (fd *ForkData) UnmarshalSSZ(buf []byte) error {
+	return ssz.DecodeFromBytes(buf, fd)
+}
+
 // ComputeDomain as defined in the Ethereum 2.0 specification.
 // https://github.com/ethereum/consensus-specs/blob/dev/specs/phase0/beacon-chain.md#compute_domain
 //

mod/consensus-types/pkg/types/fork_data_test.go

@@ -74,18 +74,6 @@ func TestForkData_HashTreeRoot(t *testing.T) {
 	require.NoError(t, err)
 }
 
-func TestForkData_GetTree(t *testing.T) {
-	forkData := &types.ForkData{
-		CurrentVersion:        common.Version{},
-		GenesisValidatorsRoot: common.Root{},
-	}
-
-	tree, err := forkData.GetTree()
-
-	require.NoError(t, err)
-	require.NotNil(t, tree)
-}
-
 func TestForkData_ComputeDomain(t *testing.T) {
 	forkData := &types.ForkData{
 		CurrentVersion:        common.Version{},