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34 lines
1 KiB
C++
34 lines
1 KiB
C++
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// Copyright (c) 2023 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <test/util/random.h>
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#include <logging.h>
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#include <random.h>
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#include <uint256.h>
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#include <cstdlib>
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#include <string>
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FastRandomContext g_insecure_rand_ctx;
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/** Return the unsigned from the environment var if available, otherwise 0 */
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static uint256 GetUintFromEnv(const std::string& env_name)
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{
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const char* num = std::getenv(env_name.c_str());
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if (!num) return {};
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return uint256S(num);
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}
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void Seed(FastRandomContext& ctx)
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{
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// Should be enough to get the seed once for the process
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static uint256 seed{};
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static const std::string RANDOM_CTX_SEED{"RANDOM_CTX_SEED"};
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if (seed.IsNull()) seed = GetUintFromEnv(RANDOM_CTX_SEED);
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if (seed.IsNull()) seed = GetRandHash();
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LogPrintf("%s: Setting random seed for current tests to %s=%s\n", __func__, RANDOM_CTX_SEED, seed.GetHex());
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ctx = FastRandomContext(seed);
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}
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