Coverage Report

Created: 2020-02-14 15:38

/src/botan/build/include/botan/rdrand_rng.h
Line
Count
Source (jump to first uncovered line)
1
/*
2
* RDRAND RNG
3
* (C) 2016,2019 Jack Lloyd
4
*
5
* Botan is released under the Simplified BSD License (see license.txt)
6
*/
7
8
#ifndef BOTAN_RNG_RDRAND_H_
9
#define BOTAN_RNG_RDRAND_H_
10
11
#include <botan/rng.h>
12
13
namespace Botan {
14
15
class BOTAN_PUBLIC_API(2,0) RDRAND_RNG final : public Hardware_RNG
16
   {
17
   public:
18
      /**
19
      * Constructor will throw if CPU does not have RDRAND bit set
20
      */
21
      RDRAND_RNG();
22
23
      /**
24
      * Return true if RDRAND is available on the current processor
25
      */
26
      static bool available();
27
28
0
      bool accepts_input() const override { return false; }
29
30
      /**
31
      * Uses RDRAND to produce output
32
      */
33
      void randomize(uint8_t out[], size_t out_len) override;
34
35
      /*
36
      * No way to provide entropy to RDRAND generator, so add_entropy is ignored
37
      */
38
      void add_entropy(const uint8_t[], size_t) override
39
0
         { /* no op */ }
40
41
      /*
42
      * No way to reseed RDRAND generator, so reseed is ignored
43
      */
44
      size_t reseed(Entropy_Sources&, size_t, std::chrono::milliseconds) override
45
0
         { return 0; /* no op */ }
46
47
0
      std::string name() const override { return "RDRAND"; }
48
49
0
      bool is_seeded() const override { return true; }
50
51
      /**
52
      * On correctly working hardware, RDRAND is always supposed to
53
      * succeed within a set number of retries. If after that many
54
      * retries RDRAND has still not suceeded, sets ok = false and
55
      * returns 0.
56
      */
57
      static uint32_t BOTAN_DEPRECATED("Use RDRAND_RNG::randomize") rdrand_status(bool& ok);
58
59
      /*
60
      * Calls RDRAND until it succeeds, this could hypothetically
61
      * loop forever on broken hardware.
62
      */
63
      static uint32_t BOTAN_DEPRECATED("Use RDRAND_RNG::randomize") rdrand();
64
   };
65
66
}
67
68
#endif