ios: nearbyConnections: Move source to //third_party.

PiperOrigin-RevId: 408046875

cpp/platform/impl/ios/Source/Shared/BUILD

@@ -0,0 +1,30 @@
+# 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.
+licenses(["notice"])
+
+package(default_visibility = ["//platform/impl/ios:__subpackages__"])
+
+objc_library(
+    name = "Shared",
+    srcs = [
+        "GNCUtils.m",
+    ],
+    hdrs = [
+        "GNCUtils.h",
+    ],
+    deps = [
+        "//third_party/objective_c/google_toolbox_for_mac:GTM_StringEncoding",
+        "//smhasher:libmurmur3",
+    ],
+)

cpp/platform/impl/ios/Source/Shared/GNCUtils.h

@@ -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.
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+// Current version of socket protocol.
+extern const int GNCSocketVersion;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/// Generates a SHA-256 hash (32 bytes) from a data object.
+NSData *_Nullable GNCSha256Data(NSData *data);
+
+/// Generates a SHA-256 hash (32 bytes) from a string.
+NSData *_Nullable GNCSha256String(NSString *string);
+
+
+/// Generates an MD5 hash (16 bytes) from a data object.
+NSData *_Nullable GNCMd5Data(NSData *data);
+
+/// Generates an MD5 hash (16 bytes) from a string.
+NSData *_Nullable GNCMd5String(NSString *string);
+
+
+/// Base64-encode.
+NSString *GNCBase64Encode(NSData *data);
+
+/// Base64-decode.
+NSData *GNCBase64Decode(NSString *string);
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+NS_ASSUME_NONNULL_END

cpp/platform/impl/ios/Source/Shared/GNCUtils.m

@@ -0,0 +1,65 @@
+#import "third_party/nearby_connections/cpp/platform/impl/ios/Source/Shared/GNCUtils.h"
+
+#import <CommonCrypto/CommonDigest.h>
+
+#import "third_party/objective_c/google_toolbox_for_mac/Foundation/GTMStringEncoding.h"
+// 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.
+
+
+NS_ASSUME_NONNULL_BEGIN
+
+const int GNCSocketVersion = 2;
+
+NSData *GNCSha256Data(NSData *data) {
+  unsigned char output[CC_SHA256_DIGEST_LENGTH];
+  CC_LONG length = (CC_LONG)data.length;
+  if (!CC_SHA256(data.bytes, length, output)) return nil;
+  return [NSData dataWithBytes:output length:CC_SHA256_DIGEST_LENGTH];
+}
+
+NSData *GNCSha256String(NSString *string) {
+  return GNCSha256Data([string dataUsingEncoding:NSUTF8StringEncoding]);
+}
+
+NSData *GNCMd5Data(NSData *data) {
+  unsigned char md5Buffer[CC_MD5_DIGEST_LENGTH];
+  CC_MD5(data.bytes, (CC_LONG)data.length, md5Buffer);
+  return [NSData dataWithBytes:md5Buffer length:CC_MD5_DIGEST_LENGTH];
+}
+
+NSData *GNCMd5String(NSString *string) {
+  return GNCMd5Data([string dataUsingEncoding:NSUTF8StringEncoding]);
+}
+
+static GTMStringEncoding *GNCBase64WebSafeEncodingNoPadding() {
+  static dispatch_once_t onceToken;
+  static GTMStringEncoding *encoding;
+  dispatch_once(&onceToken, ^{
+    encoding = [GTMStringEncoding stringEncodingWithString:
+        @"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"];
+    [encoding setDoPad:NO];
+  });
+  return encoding;
+}
+
+NSString *GNCBase64Encode(NSData *data) {
+  return [GNCBase64WebSafeEncodingNoPadding() encode:data error:nil];
+}
+
+NSData *GNCBase64Decode(NSString *string) {
+  return [GNCBase64WebSafeEncodingNoPadding() decode:string error:nil];
+}
+
+NS_ASSUME_NONNULL_END