michael@0: // Copyright (c) 2012 The Chromium Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: 
michael@0: #ifndef BASE_RAND_UTIL_H_
michael@0: #define BASE_RAND_UTIL_H_
michael@0: 
michael@0: #include <string>
michael@0: 
michael@0: #include "base/base_export.h"
michael@0: #include "base/basictypes.h"
michael@0: 
michael@0: namespace base {
michael@0: 
michael@0: // Returns a random number in range [0, kuint64max]. Thread-safe.
michael@0: BASE_EXPORT uint64 RandUint64();
michael@0: 
michael@0: // Returns a random number between min and max (inclusive). Thread-safe.
michael@0: BASE_EXPORT int RandInt(int min, int max);
michael@0: 
michael@0: // Returns a random number in range [0, range).  Thread-safe.
michael@0: //
michael@0: // Note that this can be used as an adapter for std::random_shuffle():
michael@0: // Given a pre-populated |std::vector<int> myvector|, shuffle it as
michael@0: //   std::random_shuffle(myvector.begin(), myvector.end(), base::RandGenerator);
michael@0: BASE_EXPORT uint64 RandGenerator(uint64 range);
michael@0: 
michael@0: // Returns a random double in range [0, 1). Thread-safe.
michael@0: BASE_EXPORT double RandDouble();
michael@0: 
michael@0: // Given input |bits|, convert with maximum precision to a double in
michael@0: // the range [0, 1). Thread-safe.
michael@0: BASE_EXPORT double BitsToOpenEndedUnitInterval(uint64 bits);
michael@0: 
michael@0: // Fills |output_length| bytes of |output| with random data.
michael@0: //
michael@0: // WARNING:
michael@0: // Do not use for security-sensitive purposes.
michael@0: // See crypto/ for cryptographically secure random number generation APIs.
michael@0: BASE_EXPORT void RandBytes(void* output, size_t output_length);
michael@0: 
michael@0: // Fills a string of length |length| with with random data and returns it.
michael@0: // |length| should be nonzero.
michael@0: //
michael@0: // Note that this is a variation of |RandBytes| with a different return type.
michael@0: //
michael@0: // WARNING:
michael@0: // Do not use for security-sensitive purposes.
michael@0: // See crypto/ for cryptographically secure random number generation APIs.
michael@0: BASE_EXPORT std::string RandBytesAsString(size_t length);
michael@0: 
michael@0: #if defined(OS_POSIX)
michael@0: BASE_EXPORT int GetUrandomFD();
michael@0: #endif
michael@0: 
michael@0: }  // namespace base
michael@0: 
michael@0: #endif  // BASE_RAND_UTIL_H_