21768358452

Committed 06 Feb 2026 10:35PM UTC coverage: 90.064% (-0.003%) from 90.067%

Build # 21768358452

Build Type

Pull #5289

github

Committed by

web-flow

Commit Message

Merge f589db195 into 8ea0ca252

Pull Request Pull Request #5289: Further misc header reductions, forward declarations, etc

Run Details

102238 of 113517 relevant lines covered (90.06%)

11357432.36 hits per line

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92.59

/src/lib/math/bigint/big_rand.cpp

/*
* BigInt Random Generation
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#include <botan/bigint.h>

#include <botan/exceptn.h>
#include <botan/rng.h>
#include <botan/internal/rounding.h>

namespace Botan {

/*
* Randomize this number
*/
void BigInt::randomize(RandomNumberGenerator& rng, size_t bitsize, bool set_high_bit) {
   set_sign(Positive);

   if(bitsize == 0) {
      clear();
   } else {
      secure_vector<uint8_t> array = rng.random_vec(round_up(bitsize, 8) / 8);

      // Always cut unwanted bits
      if(bitsize % 8 > 0) {
         array[0] &= 0xFF >> (8 - (bitsize % 8));
      }

      // Set the highest bit if wanted
      if(set_high_bit) {
         array[0] |= 0x80 >> ((bitsize % 8) > 0 ? (8 - bitsize % 8) : 0);
      }

      assign_from_bytes(array);
   }
}

/*
* Generate a random integer within given range
*/
BigInt BigInt::random_integer(RandomNumberGenerator& rng, const BigInt& min, const BigInt& max) {
   if(min.is_negative() || max.is_negative() || max <= min) {
      throw Invalid_Argument("BigInt::random_integer invalid range");
   }

   /*
   If min is > 1 then we generate a random number `r` in [0,max-min)
   and return min + r.

   This same logic could also be reasonably chosen for min == 1, but
   that breaks certain tests which expect stability of this function
   when generating within [1,n)
   */
   if(min > 1) {
      const BigInt diff = max - min;
      // This call is recursive, but will not recurse further
      return min + BigInt::random_integer(rng, BigInt::zero(), diff);
   }

   BOTAN_DEBUG_ASSERT(min <= 1);

   const size_t bits = max.bits();

   for(;;) {
      BigInt r;
      r.randomize(rng, bits, false);
      if(r >= min && r < max) {
         return r;
      }
   }
}

}  // namespace Botan

1	/*
2	* BigInt Random Generation
3	* (C) 1999-2007 Jack Lloyd
4	*
5	* Botan is released under the Simplified BSD License (see license.txt)
6	*/
7
8	#include <botan/bigint.h>
9
10	#include <botan/exceptn.h>
11	#include <botan/rng.h>
12	#include <botan/internal/rounding.h>
13
14	namespace Botan {
15
16	/*
17	* Randomize this number
18	*/
19	void BigInt::randomize(RandomNumberGenerator& rng, size_t bitsize, bool set_high_bit) {	497,468✔
20	set_sign(Positive);	497,468✔
21
22	if(bitsize == 0) {	497,468✔
23	clear();	×
24	} else {
25	secure_vector<uint8_t> array = rng.random_vec(round_up(bitsize, 8) / 8);	497,468✔
26
27	// Always cut unwanted bits
28	if(bitsize % 8 > 0) {	497,467✔
29	array[0] &= 0xFF >> (8 - (bitsize % 8));	375,494✔
30	}
31
32	// Set the highest bit if wanted
33	if(set_high_bit) {	497,467✔
34	array[0] \|= 0x80 >> ((bitsize % 8) > 0 ? (8 - bitsize % 8) : 0);	25,421✔
35	}
36
37	assign_from_bytes(array);	497,467✔
38	}	497,467✔
39	}	497,467✔
40
41	/*
42	* Generate a random integer within given range
43	*/
44	BigInt BigInt::random_integer(RandomNumberGenerator& rng, const BigInt& min, const BigInt& max) {	434,155✔
45	if(min.is_negative() \|\| max.is_negative() \|\| max <= min) {	868,310✔
46	throw Invalid_Argument("BigInt::random_integer invalid range");	×
47	}
48
49	/*
50	If min is > 1 then we generate a random number `r` in [0,max-min)
51	and return min + r.
52
53	This same logic could also be reasonably chosen for min == 1, but
54	that breaks certain tests which expect stability of this function
55	when generating within [1,n)
56	*/
57	if(min > 1) {	434,155✔
58	const BigInt diff = max - min;	213,759✔
59	// This call is recursive, but will not recurse further
60	return min + BigInt::random_integer(rng, BigInt::zero(), diff);	213,759✔
61	}	213,759✔
62
63	BOTAN_DEBUG_ASSERT(min <= 1);	220,396✔
64
65	const size_t bits = max.bits();	220,396✔
66
67	for(;;) {	84,579✔
68	BigInt r;	304,975✔
69	r.randomize(rng, bits, false);	304,975✔
70	if(r >= min && r < max) {	609,950✔
71	return r;	220,396✔
72	}
73	}	304,975✔
74	}
75
76	} // namespace Botan

randombit / botan / 21768358452

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