Move crypto_helpers from sync to base

crypto/md5_calculator.cc

Index: crypto/md5_calculator.cc
diff --git a/crypto/md5_calculator.cc b/crypto/md5_calculator.cc
new file mode 100644
index 0000000000000000000000000000000000000000..1b77a081033e0ce4c21a461bc73705ed80d6e742
--- /dev/null
+++ b/crypto/md5_calculator.cc
@@ -0,0 +1,44 @@
+// Copyright (c) 2011 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 "crypto/md5_calculator.h"
+
+#include <string>
+#include <vector>
+
+#include "base/format_macros.h"
+#include "base/logging.h"
+
+MD5Calculator::MD5Calculator() {
+  MD5Init(&context_);
+}
+
+MD5Calculator::~MD5Calculator() {}
+
+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));
+  }
+}
+
+const std::vector<uint8>& MD5Calculator::GetDigest() {
+  CalcDigest();
+  return bin_digest_;
+}
+
+std::string MD5Calculator::GetHexDigest() {
+  CalcDigest();
+  std::string hex =
+      base::HexEncode(reinterpret_cast<char*>(&bin_digest_.front()),
+                                              bin_digest_.size());
+  StringToLowerASCII(&hex);
+  return hex;
+}