From 3d808c6f8099b19cd85d68e83e4c670caa0a02f3 Mon Sep 17 00:00:00 2001
From: hai007 <hais@google.com>
Date: Fri, 9 Apr 2021 14:42:20 -0700
Subject: [PATCH] Internal change

PiperOrigin-RevId: 367707033
---
 cpp/platform/impl/windows/BUILD          | 41 ++++++++++++++++++
 cpp/platform/impl/windows/crypto.cc      | 54 ++++++++++++++++++++++++
 cpp/platform/impl/windows/crypto_test.cc | 50 ++++++++++++++++++++++
 3 files changed, 145 insertions(+)
 create mode 100644 cpp/platform/impl/windows/BUILD
 create mode 100644 cpp/platform/impl/windows/crypto.cc
 create mode 100644 cpp/platform/impl/windows/crypto_test.cc

diff --git a/cpp/platform/impl/windows/BUILD b/cpp/platform/impl/windows/BUILD
new file mode 100644
index 00000000..fe2dcdfa
--- /dev/null
+++ b/cpp/platform/impl/windows/BUILD
@@ -0,0 +1,41 @@
+# Copyright 2020 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+cc_library(
+    name = "crypto",
+    testonly = True,
+    srcs = [
+        "crypto.cc",
+    ],
+    visibility = ["//visibility:private"],
+    deps = [
+        "//platform/api:types",
+        "//platform/base",
+        "//absl/strings",
+        "//openssl:crypto",
+    ],
+)
+
+cc_test(
+    name = "impl_test",
+    size = "small",
+    srcs = [
+        "crypto_test.cc",
+    ],
+    deps = [
+        ":crypto",
+        "//platform/api:types",
+        "//testing/base/public:gunit_main",
+    ],
+)
diff --git a/cpp/platform/impl/windows/crypto.cc b/cpp/platform/impl/windows/crypto.cc
new file mode 100644
index 00000000..263bec27
--- /dev/null
+++ b/cpp/platform/impl/windows/crypto.cc
@@ -0,0 +1,54 @@
+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "platform/api/crypto.h"
+
+#include <cstdint>
+#include <string>
+
+#include "platform/base/byte_array.h"
+#include "absl/strings/string_view.h"
+#include "openssl/digest.h"
+
+// Function implementations for platform/api/crypto.h.
+namespace location {
+namespace nearby {
+
+// Initialize global crypto state.
+void Crypto::Init() {}
+
+static ByteArray Hash(absl::string_view input, const EVP_MD* algo) {
+  unsigned int md_out_size = EVP_MAX_MD_SIZE;
+  uint8_t digest_buffer[EVP_MAX_MD_SIZE];
+  if (input.empty()) return {};
+
+  if (!EVP_Digest(input.data(), input.size(), digest_buffer, &md_out_size, algo,
+                  nullptr))
+    return {};
+
+  return ByteArray{reinterpret_cast<char*>(digest_buffer), md_out_size};
+}
+
+// Return MD5 hash of input.
+ByteArray Crypto::Md5(absl::string_view input) {
+  return Hash(input, EVP_md5());
+}
+
+// Return SHA256 hash of input.
+ByteArray Crypto::Sha256(absl::string_view input) {
+  return Hash(input, EVP_sha256());
+}
+
+}  // namespace nearby
+}  // namespace location
diff --git a/cpp/platform/impl/windows/crypto_test.cc b/cpp/platform/impl/windows/crypto_test.cc
new file mode 100644
index 00000000..5276a9e6
--- /dev/null
+++ b/cpp/platform/impl/windows/crypto_test.cc
@@ -0,0 +1,50 @@
+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "platform/api/crypto.h"
+
+#include "gtest/gtest.h"
+
+namespace location {
+namespace nearby {
+namespace {
+
+TEST(CryptoTest, Md5Hash) {
+  const std::string input{"Hello Nearby Connection"};
+  const ByteArray expected_md5(
+      "\x94\xa3\xbe\xc1\x8d\x30\xe3\x24\x5f\xa1\x4c\xee\xe7\x52\xe9\x36");
+  ByteArray md5_hash = Crypto::Md5(input);
+  EXPECT_EQ(md5_hash, expected_md5);
+}
+
+TEST(CryptoTest, Md5HashOnEmptyInput) {
+  EXPECT_EQ(Crypto::Md5(""), ByteArray{});
+}
+
+TEST(CryptoTest, Sha256Hash) {
+  const std::string input("Hello Nearby Connection");
+  const ByteArray expected_sha256(
+      "\xb4\x24\xd3\xc0\x58\x12\x9a\x42\xcb\x81\xa0\x4b\x6e\x9d\xfe\x45\x45\x9f"
+      "\x15\xf7\xc0\xa9\x32\x2f\xfb\x9\x45\xf0\xf9\xbe\x75\xb");
+  ByteArray sha256_hash = Crypto::Sha256(input);
+  EXPECT_EQ(sha256_hash, expected_sha256);
+}
+
+TEST(CryptoTest, Sha256HashOnEmptyInput) {
+  EXPECT_EQ(Crypto::Sha256(""), ByteArray{});
+}
+
+}  // namespace
+}  // namespace nearby
+}  // namespace location