Add base to the repository.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@8 0039d316-1c4b-4281-b951-d872f2087c98

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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef BASE_MD5_H__
+#define BASE_MD5_H__
+
+#include <string>
+
+// 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
+typedef struct MD5Digest_struct {
+  unsigned char a[16];
+} MD5Digest;
+
+// 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, updates the given MD5 context with the sum of
+// the data. You can call this any number of times during the computation,
+// exept that MD5Init must have been called first.
+void MD5Update(MD5Context* context, const void* buf, size_t len);
+
+// Finalizes the MD5 operation and fills the buffer with the digest.
+void MD5Final(MD5Digest* digest, MD5Context* pCtx);
+
+// 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);
+
+#endif // BASE_MD5_H__