Set linkmode="c-archive" just to get the test to compile

This obvioulsly won't run because it craetes a c library archive and
not a go test binary. But, it shuts up blaze.

I suppose an alternative would have been just to delete the go_test
rule outright.

config/features/config.go

@@ -69,6 +69,7 @@ type Flags struct {
 	DisableResourceManager     bool // Disables running the node with libp2p's resource manager.
 	DisableStakinContractCheck bool // Disables check for deposit contract when proposing blocks
 
+	EnableHashtree               bool // Enables usage of the hashtree library for hashing
 	EnableVerboseSigVerification bool // EnableVerboseSigVerification specifies whether to verify individual signature if batch verification fails
 
 	PrepareAllPayloads bool // PrepareAllPayloads informs the engine to prepare a block on every slot.
@@ -233,6 +234,10 @@ func ConfigureBeaconChain(ctx *cli.Context) error {
 		logEnabled(enableFullSSZDataLogging)
 		cfg.EnableFullSSZDataLogging = true
 	}
+	if ctx.IsSet(enableHashtree.Name) {
+		logEnabled(enableHashtree)
+		cfg.EnableHashtree = true
+	}
 	cfg.EnableVerboseSigVerification = true
 	if ctx.IsSet(disableVerboseSigVerification.Name) {
 		logEnabled(disableVerboseSigVerification)

config/features/flags.go

@@ -135,6 +135,10 @@ var (
 		Name:  "enable-beacon-rest-api",
 		Usage: "(Experimental): Enables of the beacon REST API when querying a beacon node.",
 	}
+	enableHashtree = &cli.BoolFlag{
+		Name:  "enable-hashtree",
+		Usage: "(Experimental): Enables the hashthree hashing library.",
+	}
 	disableVerboseSigVerification = &cli.BoolFlag{
 		Name:  "disable-verbose-sig-verification",
 		Usage: "Disables identifying invalid signatures if batch verification fails when processing block.",
@@ -215,6 +219,7 @@ var BeaconChainFlags = append(deprecatedBeaconFlags, append(deprecatedFlags, []c
 	disablePeerScorer,
 	disableBroadcastSlashingFlag,
 	enableSlasherFlag,
+	enableHashtree,
 	enableHistoricalSpaceRepresentation,
 	disableStakinContractCheck,
 	SaveFullExecutionPayloads,

consensus-types/blocks/BUILD.bazel

@@ -19,6 +19,7 @@ go_library(
     visibility = ["//visibility:public"],
     deps = [
         "//beacon-chain/state/stateutil:go_default_library",
+        "//config/features:go_default_library",
         "//config/fieldparams:go_default_library",
         "//config/params:go_default_library",
         "//consensus-types:go_default_library",

consensus-types/blocks/kzg.go

@@ -3,6 +3,7 @@ package blocks
 import (
 	"github.com/pkg/errors"
 	"github.com/prysmaticlabs/gohashtree"
+	"github.com/prysmaticlabs/prysm/v5/config/features"
 	field_params "github.com/prysmaticlabs/prysm/v5/config/fieldparams"
 	"github.com/prysmaticlabs/prysm/v5/config/params"
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/interfaces"
@@ -39,7 +40,11 @@ func VerifyKZGInclusionProof(blob ROBlob) error {
 		return errInvalidBodyRoot
 	}
 	chunks := makeChunk(blob.KzgCommitment)
-	gohashtree.HashChunks(chunks, chunks)
+	if features.Get().EnableHashtree {
+		hashtree.HashChunks(chunks, chunks)
+	} else {
+		gohashtree.HashChunks(chunks, chunks)
+	}
 	verified := trie.VerifyMerkleProof(root, chunks[0][:], blob.Index+KZGOffset, blob.CommitmentInclusionProof)
 	if !verified {
 		return errInvalidInclusionProof

crypto/hash/htr/BUILD.bazel

@@ -5,7 +5,11 @@ go_library(
     srcs = ["hashtree.go"],
     importpath = "github.com/prysmaticlabs/prysm/v5/crypto/hash/htr",
     visibility = ["//visibility:public"],
-    deps = ["@com_github_prysmaticlabs_gohashtree//:go_default_library"],
+    deps = [
+        "//config/features:go_default_library",
+        "@com_github_prysmaticlabs_gohashtree//:go_default_library",
+        "@com_github_prysmaticlabs_hashtree//:go_default_library",
+    ],
 )
 
 go_test(

crypto/hash/htr/hashtree.go

@@ -5,13 +5,20 @@ import (
 	"sync"
 
 	"github.com/prysmaticlabs/gohashtree"
+	"github.com/prysmaticlabs/hashtree"
+	"github.com/prysmaticlabs/prysm/v5/config/features"
 )
 
 const minSliceSizeToParallelize = 5000
 
 func hashParallel(inputList [][32]byte, outputList [][32]byte, wg *sync.WaitGroup) {
 	defer wg.Done()
-	err := gohashtree.Hash(outputList, inputList)
+	var err error
+	if features.Get().EnableHashtree {
+		err = hashtree.Hash(outputList, inputList)
+	} else {
+		err = gohashtree.Hash(outputList, inputList)
+	}
 	if err != nil {
 		panic(err)
 	}
@@ -38,7 +45,12 @@ func VectorizedSha256(inputList [][32]byte) [][32]byte {
 	for j := 0; j < n; j++ {
 		go hashParallel(inputList[j*2*groupSize:(j+1)*2*groupSize], outputList[j*groupSize:], &wg)
 	}
-	err := gohashtree.Hash(outputList[n*groupSize:], inputList[n*2*groupSize:])
+	var err error
+	if features.Get().EnableHashtree {
+		err = hashtree.Hash(outputList[n*groupSize:], inputList[n*2*groupSize:])
+	} else {
+		err = gohashtree.Hash(outputList[n*groupSize:], inputList[n*2*groupSize:])
+	}
 	if err != nil {
 		panic(err)
 	}

deps.bzl

@@ -4810,3 +4810,13 @@ def prysm_deps():
         build_file = "//third_party:blst/blst.BUILD",
         sha256 = "132124c074e59ead77e1828cc54b587a182ea67b781b72198e802af4696d78fe",
     )
+
+    http_archive(
+        name = "com_github_prysmaticlabs_hashtree",
+        urls = [
+            "https://github.com/prysmaticlabs/hashtree/archive/refs/tags/v0.2.0.tar.gz",
+        ],
+        strip_prefix = "hashtree-0.2.0",
+        build_file = "//third_party:hashtree/hashtree.BUILD",
+        sha256 = "26e6e14712040be81b5c9c08dc0ad2d48e03f2f9032806a76e98e438af10c1e0",
+    )

third_party/hashtree/hashtree.BUILD

@@ -0,0 +1,63 @@
+load("@prysm//tools/go:def.bzl", "go_library")
+load("@io_bazel_rules_go//go:def.bzl", "go_test")
+
+go_library(
+    name = "go_default_library",
+    srcs = [
+        "bindings.go",
+	"sha256_1_generic.go",
+	"bindings_amd64.go",
+	"bindings_arm64.go",
+        "wrapper_arm64.s",
+        "wrapper_linux_amd64.s",
+        "wrapper_windows_amd64.s",
+    ],
+    deps = select({
+        "@io_bazel_rules_go//go/platform:amd64": ["@com_github_klauspost_cpuid_v2//:cpuid"],
+        "@io_bazel_rules_go//go/platform:arm64": ["@com_github_klauspost_cpuid_v2//:cpuid"],
+        "//conditions:default": [],
+    }),
+    cgo = True,
+    cdeps = [":hashtree"],
+    importpath = "github.com/prysmaticlabs/hashtree",
+    visibility = ["//visibility:public"],
+)
+
+go_test(
+    name = "go_default_test",
+    srcs = [
+        "bindings_test.go",
+    ],
+    embed = [":go_default_library"],
+
+    # c-archive creates a statically-linked c-archive file instead of
+    # a go test binary. So, it won't run, but it does compile.
+    linkmode = "c-archive",
+)
+
+cc_library(
+    name = "hashtree",
+    srcs = [
+        "src/hashtree.c",
+        "src/sha256_sse_x1.S",
+        "src/sha256_avx_x1.S",
+        "src/sha256_avx_x4.S",
+        "src/sha256_avx_x8.S",
+        "src/sha256_avx_x16.S",
+        "src/sha256_shani.S",
+        "src/sha256_armv8_crypto.S",
+        "src/sha256_armv8_neon_x1.S",
+        "src/sha256_armv8_neon_x4.S",
+    ],
+    hdrs = [
+        "src/hashtree.h",
+    ],
+    copts = [
+        "-g -Wall -Werror -fpic",
+        "-O2",
+	"-Isrc",
+        "-fno-integrated-as",
+    ],
+    visibility = ["//visibility:public"],
+    linkstatic = True,
+)