Remove boringssl dependency. Replace sha256 with absl::Hash.

WORKSPACE

@@ -230,12 +230,3 @@ maybe(
         "https://zlib.net/fossils/zlib-1.2.13.tar.gz",
     ],
 )
-
-# Only needed for sha256; Version taken from branch with bazel rules
-# https://github.com/google/boringssl/tree/master-with-bazel
-http_archive(
-    name = "com_google_boringssl",
-    sha256 = "8b28b030652d1b5e0f8de306e8bdc1b67f7164c2ec889056a0c13e78ba615a34",
-    strip_prefix = "boringssl-342e805bc1f5dfdd650e3f031686d6c939b095d9",
-    urls = ["https://github.com/google/boringssl/archive/342e805bc1f5dfdd650e3f031686d6c939b095d9.zip"],
-)

verilog/tools/kythe/BUILD

@@ -277,9 +277,9 @@ cc_library(
         "//common/util:file-util",
         "//common/util:simple-zip",
         "//third_party/proto/kythe:analysis_cc_proto",
+        "@com_google_absl//absl/hash",
         "@com_google_absl//absl/status",
         "@com_google_absl//absl/strings",
-        "@com_google_boringssl//:crypto",
     ],
 )
 

verilog/tools/kythe/kzip_creator.cc

@@ -19,12 +19,12 @@
 #include <string>
 #include <vector>
 
+#include "absl/hash/hash.h"
 #include "absl/status/status.h"
 #include "absl/strings/escaping.h"
 #include "absl/strings/string_view.h"
 #include "common/util/file_util.h"
 #include "common/util/simple_zip.h"
-#include "openssl/sha.h"
 #include "third_party/proto/kythe/analysis.pb.h"
 
 namespace verilog {
@@ -34,12 +34,8 @@ namespace {
 constexpr absl::string_view kProtoUnitRoot = "root/pbunits/";
 constexpr absl::string_view kFileRoot = "root/files/";
 
-std::string SHA256Digest(absl::string_view content) {
-  std::array<unsigned char, SHA256_DIGEST_LENGTH> buf;
-  ::SHA256(reinterpret_cast<const unsigned char *>(content.data()),
-           content.size(), buf.data());
-  return absl::BytesToHexString(absl::string_view(
-      reinterpret_cast<const char *>(buf.data()), buf.size()));
+std::string Digest(absl::string_view content) {
+  return absl::StrCat(absl::HashOf(content));
 }
 
 constexpr int kKZipCompressionLevel = 9;
@@ -58,7 +54,7 @@ KzipCreator::KzipCreator(absl::string_view output_path)
 
 std::string KzipCreator::AddSourceFile(absl::string_view path,
                                        absl::string_view content) {
-  std::string digest = SHA256Digest(content);
+  std::string digest = Digest(content);
   const std::string archive_path = verible::file::JoinPath(kFileRoot, digest);
   archive_.AddFile(archive_path, verible::zip::MemoryByteSource(content));
   return digest;
@@ -70,7 +66,7 @@ absl::Status KzipCreator::AddCompilationUnit(
   if (!unit.SerializeToString(&content)) {
     return absl::InternalError("Failed to serialize the compilation unit");
   }
-  const std::string digest = SHA256Digest(content);
+  const std::string digest = Digest(content);
   const std::string archive_path =
       verible::file::JoinPath(kProtoUnitRoot, digest);
   archive_.AddFile(archive_path, verible::zip::MemoryByteSource(content));

verilog/tools/kythe/kzip_creator.h

@@ -34,7 +34,7 @@ class KzipCreator final {
   // Initializes the archive. Crashes if initialization fails.
   explicit KzipCreator(absl::string_view output_path);
 
-  // Adds source code file to the Kzip. Returns its SHA digest.
+  // Adds source code file to the Kzip. Returns its digest.
   std::string AddSourceFile(absl::string_view path, absl::string_view content);
 
   // Adds compilation unit to the Kzip.