[rac] Temporarily copy libaddressinput to Chrome.

third_party/libaddressinput/chromium/cpp/src/util/md5.h

+// 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.
+//
+// The original source code is from:
+// http://src.chromium.org/viewvc/chrome/trunk/src/base/md5.h?revision=94203
+
+#ifndef I18N_ADDRESSINPUT_UTIL_MD5_H_
+#define I18N_ADDRESSINPUT_UTIL_MD5_H_
+
+#include <string>
+
+namespace i18n {
+namespace addressinput {
+
+// MD5 stands for Message Digest algorithm 5.
+// MD5 is a robust hash function, designed for cyptography, but often used
+// for file checksums.  The code is complex and slow, but has few
+// collisions.
+// See Also:
+//   http://en.wikipedia.org/wiki/MD5
+
+// These functions perform MD5 operations. The simplest call is MD5Sum() to
+// generate the MD5 sum of the given data.
+//
+// You can also compute the MD5 sum of data incrementally by making multiple
+// calls to MD5Update():
+//   MD5Context ctx; // intermediate MD5 data: do not use
+//   MD5Init(&ctx);
+//   MD5Update(&ctx, data1, length1);
+//   MD5Update(&ctx, data2, length2);
+//   ...
+//
+//   MD5Digest digest; // the result of the computation
+//   MD5Final(&digest, &ctx);
+//
+// You can call MD5DigestToBase16() to generate a string of the digest.
+
+// The output of an MD5 operation.
+struct MD5Digest {
+  unsigned char a[16];
+};
+
+// Used for storing intermediate data during an MD5 computation. Callers
+// should not access the data.
+typedef char MD5Context[88];
+
+// Computes the MD5 sum of the given data buffer with the given length.
+// The given 'digest' structure will be filled with the result data.
+void MD5Sum(const void* data, size_t length, MD5Digest* digest);
+
+// Initializes the given MD5 context structure for subsequent calls to
+// MD5Update().
+void MD5Init(MD5Context* context);
+
+// For the given buffer of |data| as a StringPiece, updates the given MD5
+// context with the sum of the data. You can call this any number of times
+// during the computation, except that MD5Init() must have been called first.
+void MD5Update(MD5Context* context, const std::string& data);
+
+// Finalizes the MD5 operation and fills the buffer with the digest.
+void MD5Final(MD5Digest* digest, MD5Context* context);
+
+// Converts a digest into human-readable hexadecimal.
+std::string MD5DigestToBase16(const MD5Digest& digest);
+
+// Returns the MD5 (in hexadecimal) of a string.
+std::string MD5String(const std::string& str);
+
+}  // namespace addressinput
+}  // namespace i18n
+
+#endif  // I18N_ADDRESSINPUT_UTIL_MD5_H_