Initial commit of sync engine code to browser/sync....

chrome/browser/sync/util/crypto_helpers.cc

+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/sync/util/crypto_helpers.h"
+
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/format_macros.h"
+#include "base/logging.h"
+#include "base/rand_util.h"
+#include "base/string_util.h"
+
+using std::string;
+using std::vector;
+
+MD5Calculator::MD5Calculator() {
+  MD5Init(&context_);
+}
+
+void MD5Calculator::AddData(const unsigned char* data, int length) {
+  CHECK(bin_digest_.empty());
+  MD5Update(&context_, data, length);
+}
+
+void MD5Calculator::CalcDigest() {
+  if (bin_digest_.empty()) {
+    MD5Digest digest;
+    MD5Final(&digest, &context_);
+    bin_digest_.assign(digest.a, digest.a + arraysize(digest.a));
+  }
+}
+
+vector<uint8> MD5Calculator::GetDigest() {
+  CalcDigest();
+  return bin_digest_;
+}
+
+PathString MD5Calculator::GetHexDigest() {
+  CalcDigest();
+  string hex = HexEncode(reinterpret_cast<char*>(&bin_digest_.front()),
+                         bin_digest_.size());
+  StringToLowerASCII(&hex);
+  return PathString(hex.begin(), hex.end());
+}
+
+void GetRandomBytes(char* output, int output_length) {
+  for (int i = 0; i < output_length; i++) {
+    // TODO(chron): replace this with something less stupid.
+    output[i] = static_cast<char>(base::RandUint64());
+  }
+}
+
+string Generate128BitRandomHexString() {
+  int64 chunk1 = static_cast<int64>(base::RandUint64());
+  int64 chunk2 = static_cast<int64>(base::RandUint64());
+
+  return StringPrintf("%016" PRId64 "x%016" PRId64 "x",
+      chunk1, chunk2);
+}