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45afbc1e81
This is useful in environments where OpenSSL may not be available. Bug: webrtc:15240 Change-Id: I7ba29e44bd1d25231df13ee79dacc74f260ded67 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/308600 Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Sameer Vijaykar <samvi@google.com> Cr-Commit-Position: refs/heads/main@{#40293}
92 lines
3.2 KiB
C++
92 lines
3.2 KiB
C++
/*
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* Copyright 2004 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef RTC_BASE_HELPERS_H_
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#define RTC_BASE_HELPERS_H_
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#include <stddef.h>
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#include <stdint.h>
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#include <memory>
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#include <string>
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#include "absl/strings/string_view.h"
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#include "rtc_base/system/rtc_export.h"
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namespace rtc {
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// Interface for RNG implementations.
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class RandomGenerator {
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public:
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virtual ~RandomGenerator() {}
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virtual bool Init(const void* seed, size_t len) = 0;
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virtual bool Generate(void* buf, size_t len) = 0;
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};
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// Sets the default random generator as the source of randomness. The default
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// source uses the OpenSSL RNG and provides cryptographically secure randomness.
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void SetDefaultRandomGenerator();
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// Set a custom random generator. Results produced by CreateRandomXyz
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// are cryptographically random iff the output of the supplied generator is
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// cryptographically random.
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void SetRandomGenerator(std::unique_ptr<RandomGenerator> generator);
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// For testing, we can return predictable data.
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void SetRandomTestMode(bool test);
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// Initializes the RNG, and seeds it with the specified entropy.
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bool InitRandom(int seed);
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bool InitRandom(const char* seed, size_t len);
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// Generates a (cryptographically) random string of the given length.
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// We generate base64 values so that they will be printable.
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RTC_EXPORT std::string CreateRandomString(size_t length);
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// Generates a (cryptographically) random string of the given length.
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// We generate base64 values so that they will be printable.
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// Return false if the random number generator failed.
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RTC_EXPORT bool CreateRandomString(size_t length, std::string* str);
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// Generates a (cryptographically) random string of the given length,
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// with characters from the given table. Return false if the random
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// number generator failed.
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// For ease of implementation, the function requires that the table
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// size evenly divide 256; otherwise, it returns false.
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RTC_EXPORT bool CreateRandomString(size_t length,
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absl::string_view table,
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std::string* str);
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// Generates (cryptographically) random data of the given length.
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// Return false if the random number generator failed.
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bool CreateRandomData(size_t length, std::string* data);
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// Generates a (cryptographically) random UUID version 4 string.
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std::string CreateRandomUuid();
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// Generates a random id.
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uint32_t CreateRandomId();
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// Generates a 64 bit random id.
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RTC_EXPORT uint64_t CreateRandomId64();
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// Generates a random id > 0.
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uint32_t CreateRandomNonZeroId();
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// Generates a random double between 0.0 (inclusive) and 1.0 (exclusive).
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double CreateRandomDouble();
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// Compute moving average with the given ratio between the previous average
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// value and the current value.
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double GetNextMovingAverage(double prev_average, double cur, double ratio);
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} // namespace rtc
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#endif // RTC_BASE_HELPERS_H_
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