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66 lines
1.8 KiB
66 lines
1.8 KiB
// Copyright (c) 2009-2010 Satoshi Nakamoto |
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// Copyright (c) 2009-2016 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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#ifndef BITCOIN_RANDOM_H |
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#define BITCOIN_RANDOM_H |
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#include "uint256.h" |
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#include <stdint.h> |
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/* Seed OpenSSL PRNG with additional entropy data */ |
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void RandAddSeed(); |
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/** |
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* Functions to gather random data via the OpenSSL PRNG |
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*/ |
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void GetRandBytes(unsigned char* buf, int num); |
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uint64_t GetRand(uint64_t nMax); |
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int GetRandInt(int nMax); |
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uint256 GetRandHash(); |
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/** |
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* Function to gather random data from multiple sources, failing whenever any |
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* of those source fail to provide a result. |
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*/ |
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void GetStrongRandBytes(unsigned char* buf, int num); |
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/** |
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* Fast randomness source. This is seeded once with secure random data, but |
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* is completely deterministic and insecure after that. |
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* This class is not thread-safe. |
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*/ |
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class FastRandomContext { |
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public: |
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explicit FastRandomContext(bool fDeterministic=false); |
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uint32_t rand32() { |
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Rz = 36969 * (Rz & 65535) + (Rz >> 16); |
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Rw = 18000 * (Rw & 65535) + (Rw >> 16); |
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return (Rw << 16) + Rz; |
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} |
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uint32_t Rz; |
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uint32_t Rw; |
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}; |
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/* Number of random bytes returned by GetOSRand. |
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* When changing this constant make sure to change all call sites, and make |
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* sure that the underlying OS APIs for all platforms support the number. |
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* (many cap out at 256 bytes). |
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*/ |
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static const ssize_t NUM_OS_RANDOM_BYTES = 32; |
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/** Get 32 bytes of system entropy. Do not use this in application code: use |
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* GetStrongRandBytes instead. |
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*/ |
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void GetOSRand(unsigned char *ent32); |
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/** Check that OS randomness is available and returning the requested number |
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* of bytes. |
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*/ |
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bool Random_SanityCheck(); |
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#endif // BITCOIN_RANDOM_H
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