5079590438

Committed 25 May 2023 12:28PM UTC coverage: 92.228% (+0.5%) from 91.723%

Build # 5079590438

Build Type

Pull #3502

github

Pull Request Pull Request #3502: Apply clang-format to the codebase

Run Details

75589 of 81959 relevant lines covered (92.23%)

12139530.51 hits per line

Source File
Press 'n' to go to next uncovered line, 'b' for previous

95.41

/src/cli/math.cpp

/*
* (C) 2009,2010,2015 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#include "cli.h"

#if defined(BOTAN_HAS_NUMBERTHEORY)

   #include <botan/numthry.h>
   #include <botan/internal/monty.h>
   #include <iterator>

namespace Botan_CLI {

class Modular_Inverse final : public Command {
   public:
      Modular_Inverse() : Command("mod_inverse n mod") {}

      std::string group() const override { return "numtheory"; }

      std::string description() const override { return "Calculates a modular inverse"; }

      void go() override {
         const Botan::BigInt n(get_arg("n"));
         const Botan::BigInt mod(get_arg("mod"));

         output() << Botan::inverse_mod(n, mod) << "\n";
      }
};

BOTAN_REGISTER_COMMAND("mod_inverse", Modular_Inverse);

class Gen_Prime final : public Command {
   public:
      Gen_Prime() : Command("gen_prime --hex --count=1 bits") {}

      std::string group() const override { return "numtheory"; }

      std::string description() const override { return "Samples one or more primes"; }

      void go() override {
         const size_t bits = get_arg_sz("bits");
         const size_t cnt = get_arg_sz("count");
         const bool hex = flag_set("hex");

         for(size_t i = 0; i != cnt; ++i) {
            const Botan::BigInt p = Botan::random_prime(rng(), bits);

            if(hex)
               output() << "0x" << std::hex << p << "\n";
            else
               output() << p << "\n";
         }
      }
};

BOTAN_REGISTER_COMMAND("gen_prime", Gen_Prime);

class Is_Prime final : public Command {
   public:
      Is_Prime() : Command("is_prime --prob=56 n") {}

      std::string group() const override { return "numtheory"; }

      std::string description() const override { return "Test if the integer n is composite or prime"; }

      void go() override {
         Botan::BigInt n(get_arg("n"));
         const size_t prob = get_arg_sz("prob");
         const bool prime = Botan::is_prime(n, rng(), prob);

         output() << n << " is " << (prime ? "probably prime" : "composite") << "\n";
      }
};

BOTAN_REGISTER_COMMAND("is_prime", Is_Prime);

/*
* Factor integers using a combination of trial division by small
* primes, and Pollard's Rho algorithm
*/
class Factor final : public Command {
   public:
      Factor() : Command("factor n") {}

      std::string group() const override { return "numtheory"; }

      std::string description() const override { return "Factor a given integer"; }

      void go() override {
         Botan::BigInt n(get_arg("n"));

         std::vector<Botan::BigInt> factors = factorize(n, rng());
         std::sort(factors.begin(), factors.end());

         output() << n << ": ";
         std::copy(factors.begin(), factors.end(), std::ostream_iterator<Botan::BigInt>(output(), " "));
         output() << std::endl;
      }

   private:
      std::vector<Botan::BigInt> factorize(const Botan::BigInt& n_in, Botan::RandomNumberGenerator& rng) {
         Botan::BigInt n = n_in;
         std::vector<Botan::BigInt> factors = remove_small_factors(n);

         while(n != 1) {
            if(Botan::is_prime(n, rng)) {
               factors.push_back(n);
               break;
            }

            Botan::BigInt a_factor = 0;
            while(a_factor == 0) {
               a_factor = rho(n, rng);
            }

            const auto rho_factored = factorize(a_factor, rng);
            for(const auto& factor : rho_factored) {
               factors.push_back(factor);
            }

            n /= a_factor;
         }

         return factors;
      }

      /*
      * Pollard's Rho algorithm, as described in the MIT algorithms book.
      * Uses Brent's cycle finding
      */
      static Botan::BigInt rho(const Botan::BigInt& n, Botan::RandomNumberGenerator& rng) {
         auto monty_n = std::make_shared<Botan::Montgomery_Params>(n);

         const Botan::Montgomery_Int one(monty_n, monty_n->R1(), false);

         Botan::Montgomery_Int x(monty_n, Botan::BigInt::random_integer(rng, 2, n - 3), false);
         Botan::Montgomery_Int y = x;
         Botan::Montgomery_Int z = one;
         Botan::Montgomery_Int t(monty_n);
         Botan::BigInt d;

         Botan::secure_vector<Botan::word> ws;

         size_t i = 1, k = 2;

         while(true) {
            i++;

            if(i >= 0xFFFF0000)  // bad seed? too slow? bail out
            {
               break;
            }

            x.square_this(ws);  // x = x^2
            x.add(one, ws);

            t = y;
            t.sub(x, ws);

            z.mul_by(t, ws);

            if(i == k || i % 128 == 0) {
               d = Botan::gcd(z.value(), n);
               z = one;

               if(d == n) {
                  // TODO Should rewind here
                  break;
               }

               if(d != 1)
                  return d;
            }

            if(i == k) {
               y = x;
               k = 2 * k;
            }
         }

         // failed
         return 0;
      }

      // Remove (and return) any small (< 2^16) factors
      static std::vector<Botan::BigInt> remove_small_factors(Botan::BigInt& n) {
         std::vector<Botan::BigInt> factors;

         while(n.is_even()) {
            factors.push_back(2);
            n /= 2;
         }

         for(size_t j = 0; j != Botan::PRIME_TABLE_SIZE; j++) {
            uint16_t prime = Botan::PRIMES[j];
            if(n < prime) {
               break;
            }

            Botan::BigInt x = Botan::gcd(n, prime);

            if(x != 1) {
               n /= x;

               while(x != 1) {
                  x /= prime;
                  factors.push_back(prime);
               }
            }
         }

         return factors;
      }
};

BOTAN_REGISTER_COMMAND("factor", Factor);

}

#endif

1	/*
2	* (C) 2009,2010,2015 Jack Lloyd
3	*
4	* Botan is released under the Simplified BSD License (see license.txt)
5	*/
6
7	#include "cli.h"
8
9	#if defined(BOTAN_HAS_NUMBERTHEORY)
10
11	#include <botan/numthry.h>
12	#include <botan/internal/monty.h>
13	#include <iterator>
14
15	namespace Botan_CLI {
16
17	class Modular_Inverse final : public Command {
18	public:
19	Modular_Inverse() : Command("mod_inverse n mod") {}	6✔
20
21	std::string group() const override { return "numtheory"; }	1✔
22
23	std::string description() const override { return "Calculates a modular inverse"; }	1✔
24
25	void go() override {	2✔
26	const Botan::BigInt n(get_arg("n"));	4✔
27	const Botan::BigInt mod(get_arg("mod"));	4✔
28
29	output() << Botan::inverse_mod(n, mod) << "\n";	4✔
30	}	4✔
31	};
32
33	BOTAN_REGISTER_COMMAND("mod_inverse", Modular_Inverse);	3✔
34
35	class Gen_Prime final : public Command {
36	public:
37	Gen_Prime() : Command("gen_prime --hex --count=1 bits") {}	6✔
38
39	std::string group() const override { return "numtheory"; }	1✔
40
41	std::string description() const override { return "Samples one or more primes"; }	1✔
42
43	void go() override {	2✔
44	const size_t bits = get_arg_sz("bits");	2✔
45	const size_t cnt = get_arg_sz("count");	2✔
46	const bool hex = flag_set("hex");	2✔
47
48	for(size_t i = 0; i != cnt; ++i) {	4✔
49	const Botan::BigInt p = Botan::random_prime(rng(), bits);	2✔
50
51	if(hex)	2✔
52	output() << "0x" << std::hex << p << "\n";	×
53	else
54	output() << p << "\n";	2✔
55	}	2✔
56	}	2✔
57	};
58
59	BOTAN_REGISTER_COMMAND("gen_prime", Gen_Prime);	3✔
60
61	class Is_Prime final : public Command {
62	public:
63	Is_Prime() : Command("is_prime --prob=56 n") {}	8✔
64
65	std::string group() const override { return "numtheory"; }	1✔
66
67	std::string description() const override { return "Test if the integer n is composite or prime"; }	1✔
68
69	void go() override {	3✔
70	Botan::BigInt n(get_arg("n"));	6✔
71	const size_t prob = get_arg_sz("prob");	3✔
72	const bool prime = Botan::is_prime(n, rng(), prob);	3✔
73
74	output() << n << " is " << (prime ? "probably prime" : "composite") << "\n";	4✔
75	}	3✔
76	};
77
78	BOTAN_REGISTER_COMMAND("is_prime", Is_Prime);	4✔
79
80	/*
81	* Factor integers using a combination of trial division by small
82	* primes, and Pollard's Rho algorithm
83	*/
84	class Factor final : public Command {
85	public:
86	Factor() : Command("factor n") {}	8✔
87
88	std::string group() const override { return "numtheory"; }	1✔
89
90	std::string description() const override { return "Factor a given integer"; }	1✔
91
92	void go() override {	3✔
93	Botan::BigInt n(get_arg("n"));	6✔
94
95	std::vector<Botan::BigInt> factors = factorize(n, rng());	3✔
96	std::sort(factors.begin(), factors.end());	3✔
97
98	output() << n << ": ";	3✔
99	std::copy(factors.begin(), factors.end(), std::ostream_iterator<Botan::BigInt>(output(), " "));	3✔
100	output() << std::endl;	3✔
101	}	6✔
102
103	private:
104	std::vector<Botan::BigInt> factorize(const Botan::BigInt& n_in, Botan::RandomNumberGenerator& rng) {	4✔
105	Botan::BigInt n = n_in;	4✔
106	std::vector<Botan::BigInt> factors = remove_small_factors(n);	4✔
107
108	while(n != 1) {	5✔
109	if(Botan::is_prime(n, rng)) {	4✔
110	factors.push_back(n);	3✔
111	break;	3✔
112	}
113
114	Botan::BigInt a_factor = 0;	1✔
115	while(a_factor == 0) {	2✔
116	a_factor = rho(n, rng);	1✔
117	}
118
119	const auto rho_factored = factorize(a_factor, rng);	1✔
120	for(const auto& factor : rho_factored) {	2✔
121	factors.push_back(factor);	1✔
122	}
123
124	n /= a_factor;	1✔
125	}	2✔
126
127	return factors;	4✔
128	}	4✔
129
130	/*
131	* Pollard's Rho algorithm, as described in the MIT algorithms book.
132	* Uses Brent's cycle finding
133	*/
134	static Botan::BigInt rho(const Botan::BigInt& n, Botan::RandomNumberGenerator& rng) {	1✔
135	auto monty_n = std::make_shared<Botan::Montgomery_Params>(n);	1✔
136
137	const Botan::Montgomery_Int one(monty_n, monty_n->R1(), false);	1✔
138
139	Botan::Montgomery_Int x(monty_n, Botan::BigInt::random_integer(rng, 2, n - 3), false);	5✔
140	Botan::Montgomery_Int y = x;	1✔
141	Botan::Montgomery_Int z = one;	1✔
142	Botan::Montgomery_Int t(monty_n);	1✔
143	Botan::BigInt d;	1✔
144
145	Botan::secure_vector<Botan::word> ws;	1✔
146
147	size_t i = 1, k = 2;	1✔
148
149	while(true) {	147,199✔
150	i++;	147,199✔
151
152	if(i >= 0xFFFF0000) // bad seed? too slow? bail out	147,199✔
153	{
154	break;
155	}
156
157	x.square_this(ws); // x = x^2	147,199✔
158	x.add(one, ws);	147,199✔
159
160	t = y;	147,199✔
161	t.sub(x, ws);	147,199✔
162
163	z.mul_by(t, ws);	147,199✔
164
165	if(i == k \|\| i % 128 == 0) {	147,199✔
166	d = Botan::gcd(z.value(), n);	2,311✔
167	z = one;	1,156✔
168
169	if(d == n) {	1,156✔
170	// TODO Should rewind here
171	break;
172	}
173
174	if(d != 1)	1,156✔
175	return d;	1✔
176	}
177
178	if(i == k) {	147,198✔
179	y = x;	17✔
180	k = 2 * k;	17✔
181	}
182	}
183
184	// failed
185	return 0;	×
186	}	2✔
187
188	// Remove (and return) any small (< 2^16) factors
189	static std::vector<Botan::BigInt> remove_small_factors(Botan::BigInt& n) {	4✔
190	std::vector<Botan::BigInt> factors;	4✔
191
192	while(n.is_even()) {	8✔
193	factors.push_back(2);	×
194	n /= 2;	×
195	}
196
197	for(size_t j = 0; j != Botan::PRIME_TABLE_SIZE; j++) {	19,651✔
198	uint16_t prime = Botan::PRIMES[j];	19,648✔
199	if(n < prime) {	19,648✔
200	break;
201	}
202
203	Botan::BigInt x = Botan::gcd(n, prime);	19,647✔
204
205	if(x != 1) {	19,647✔
206	n /= x;	2✔
207
208	while(x != 1) {	4✔
209	x /= prime;	2✔
210	factors.push_back(prime);	4✔
211	}
212	}
213	}	19,647✔
214
215	return factors;	4✔
216	}	×
217	};
218
219	BOTAN_REGISTER_COMMAND("factor", Factor);	4✔
220
221	}
222
223	#endif

randombit / botan / 5079590438

Source File Press 'n' to go to next uncovered line, 'b' for previous

Source File
Press 'n' to go to next uncovered line, 'b' for previous