5123321399

Committed 30 May 2023 04:06PM UTC coverage: 92.213% (+0.004%) from 92.209%

Build # 5123321399

Build Type

Pull #3558

github

Committed by

web-flow

Commit Message

Merge dd72f7389 into 057bcbc35

Pull Request Pull Request #3558: Add braces around all if/else statements

Run Details

75602 of 81986 relevant lines covered (92.21%)

11859779.3 hits per line

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96.61

/src/lib/pubkey/mce/mceliece.cpp

/*
 * (C) Copyright Projet SECRET, INRIA, Rocquencourt
 * (C) Bhaskar Biswas and  Nicolas Sendrier
 *
 * (C) 2014 cryptosource GmbH
 * (C) 2014 Falko Strenzke fstrenzke@cryptosource.de
 *
 * Botan is released under the Simplified BSD License (see license.txt)
 *
 */

#include <botan/internal/mce_internal.h>

#include <botan/mceliece.h>
#include <botan/internal/bit_ops.h>
#include <botan/internal/code_based_util.h>

namespace Botan {

namespace {

secure_vector<uint8_t> concat_vectors(const secure_vector<uint8_t>& a,
                                      const secure_vector<uint8_t>& b,
                                      size_t dimension,
                                      size_t codimension) {
   secure_vector<uint8_t> x(bit_size_to_byte_size(dimension) + bit_size_to_byte_size(codimension));

   const size_t final_bits = dimension % 8;

   if(final_bits == 0) {
      const size_t dim_bytes = bit_size_to_byte_size(dimension);
      copy_mem(&x[0], a.data(), dim_bytes);
      copy_mem(&x[dim_bytes], b.data(), bit_size_to_byte_size(codimension));
   } else {
      copy_mem(&x[0], a.data(), (dimension / 8));
      size_t l = dimension / 8;
      x[l] = static_cast<uint8_t>(a[l] & ((1 << final_bits) - 1));

      for(size_t k = 0; k < codimension / 8; ++k) {
         x[l] ^= static_cast<uint8_t>(b[k] << final_bits);
         ++l;
         x[l] = static_cast<uint8_t>(b[k] >> (8 - final_bits));
      }
      x[l] ^= static_cast<uint8_t>(b[codimension / 8] << final_bits);
   }

   return x;
}

secure_vector<uint8_t> mult_by_pubkey(const secure_vector<uint8_t>& cleartext,
                                      const std::vector<uint8_t>& public_matrix,
                                      size_t code_length,
                                      size_t t) {
   const size_t ext_deg = ceil_log2(code_length);
   const size_t codimension = ext_deg * t;
   const size_t dimension = code_length - codimension;
   secure_vector<uint8_t> cR(bit_size_to_32bit_size(codimension) * sizeof(uint32_t));

   const uint8_t* pt = public_matrix.data();

   for(size_t i = 0; i < dimension / 8; ++i) {
      for(size_t j = 0; j < 8; ++j) {
         if(cleartext[i] & (1 << j)) {
            xor_buf(cR.data(), pt, cR.size());
         }
         pt += cR.size();
      }
   }

   for(size_t i = 0; i < dimension % 8; ++i) {
      if(cleartext[dimension / 8] & (1 << i)) {
         xor_buf(cR.data(), pt, cR.size());
      }
      pt += cR.size();
   }

   secure_vector<uint8_t> ciphertext = concat_vectors(cleartext, cR, dimension, codimension);
   ciphertext.resize((code_length + 7) / 8);
   return ciphertext;
}

secure_vector<uint8_t> create_random_error_vector(size_t code_length, size_t error_weight, RandomNumberGenerator& rng) {
   secure_vector<uint8_t> result((code_length + 7) / 8);

   size_t bits_set = 0;

   while(bits_set < error_weight) {
      gf2m x = random_code_element(static_cast<uint16_t>(code_length), rng);

      const size_t byte_pos = x / 8;
      const size_t bit_pos = x % 8;

      const uint8_t mask = (1 << bit_pos);

      if(result[byte_pos] & mask) {
         continue;  // already set this bit
      }

      result[byte_pos] |= mask;
      bits_set++;
   }

   return result;
}

}  // namespace

void mceliece_encrypt(secure_vector<uint8_t>& ciphertext_out,
                      secure_vector<uint8_t>& error_mask_out,
                      const secure_vector<uint8_t>& plaintext,
                      const McEliece_PublicKey& key,
                      RandomNumberGenerator& rng) {
   const uint16_t code_length = static_cast<uint16_t>(key.get_code_length());

   secure_vector<uint8_t> error_mask = create_random_error_vector(code_length, key.get_t(), rng);

   secure_vector<uint8_t> ciphertext =
      mult_by_pubkey(plaintext, key.get_public_matrix(), key.get_code_length(), key.get_t());

   ciphertext ^= error_mask;

   ciphertext_out.swap(ciphertext);
   error_mask_out.swap(error_mask);
}

}  // namespace Botan

1	/*
2	* (C) Copyright Projet SECRET, INRIA, Rocquencourt
3	* (C) Bhaskar Biswas and Nicolas Sendrier
4	*
5	* (C) 2014 cryptosource GmbH
6	* (C) 2014 Falko Strenzke fstrenzke@cryptosource.de
7	*
8	* Botan is released under the Simplified BSD License (see license.txt)
9	*
10	*/
11
12	#include <botan/internal/mce_internal.h>
13
14	#include <botan/mceliece.h>
15	#include <botan/internal/bit_ops.h>
16	#include <botan/internal/code_based_util.h>
17
18	namespace Botan {
19
20	namespace {
21
22	secure_vector<uint8_t> concat_vectors(const secure_vector<uint8_t>& a,	2,646✔
23	const secure_vector<uint8_t>& b,
24	size_t dimension,
25	size_t codimension) {
26	secure_vector<uint8_t> x(bit_size_to_byte_size(dimension) + bit_size_to_byte_size(codimension));	2,646✔
27
28	const size_t final_bits = dimension % 8;	2,646✔
29
30	if(final_bits == 0) {	2,646✔
31	const size_t dim_bytes = bit_size_to_byte_size(dimension);	713✔
32	copy_mem(&x[0], a.data(), dim_bytes);	713✔
33	copy_mem(&x[dim_bytes], b.data(), bit_size_to_byte_size(codimension));	713✔
34	} else {
35	copy_mem(&x[0], a.data(), (dimension / 8));	1,933✔
36	size_t l = dimension / 8;	1,933✔
37	x[l] = static_cast<uint8_t>(a[l] & ((1 << final_bits) - 1));	1,933✔
38
39	for(size_t k = 0; k < codimension / 8; ++k) {	90,737✔
40	x[l] ^= static_cast<uint8_t>(b[k] << final_bits);	88,804✔
41	++l;	88,804✔
42	x[l] = static_cast<uint8_t>(b[k] >> (8 - final_bits));	88,804✔
43	}
44	x[l] ^= static_cast<uint8_t>(b[codimension / 8] << final_bits);	1,933✔
45	}
46
47	return x;	2,646✔
48	}	×
49
50	secure_vector<uint8_t> mult_by_pubkey(const secure_vector<uint8_t>& cleartext,	2,646✔
51	const std::vector<uint8_t>& public_matrix,
52	size_t code_length,
53	size_t t) {
54	const size_t ext_deg = ceil_log2(code_length);	2,646✔
55	const size_t codimension = ext_deg * t;	2,646✔
56	const size_t dimension = code_length - codimension;	2,646✔
57	secure_vector<uint8_t> cR(bit_size_to_32bit_size(codimension) * sizeof(uint32_t));	2,646✔
58
59	const uint8_t* pt = public_matrix.data();	2,646✔
60
61	for(size_t i = 0; i < dimension / 8; ++i) {	345,526✔
62	for(size_t j = 0; j < 8; ++j) {	3,085,920✔
63	if(cleartext[i] & (1 << j)) {	2,743,040✔
64	xor_buf(cR.data(), pt, cR.size());	1,371,018✔
65	}
66	pt += cR.size();	2,743,040✔
67	}
68	}
69
70	for(size_t i = 0; i < dimension % 8; ++i) {	10,096✔
71	if(cleartext[dimension / 8] & (1 << i)) {	7,450✔
72	xor_buf(cR.data(), pt, cR.size());	3,668✔
73	}
74	pt += cR.size();	7,450✔
75	}
76
77	secure_vector<uint8_t> ciphertext = concat_vectors(cleartext, cR, dimension, codimension);	2,646✔
78	ciphertext.resize((code_length + 7) / 8);	2,646✔
79	return ciphertext;	2,646✔
80	}	2,646✔
81
82	secure_vector<uint8_t> create_random_error_vector(size_t code_length, size_t error_weight, RandomNumberGenerator& rng) {	2,646✔
83	secure_vector<uint8_t> result((code_length + 7) / 8);	2,646✔
84
85	size_t bits_set = 0;	2,646✔
86
87	while(bits_set < error_weight) {	85,309✔
88	gf2m x = random_code_element(static_cast<uint16_t>(code_length), rng);	82,663✔
89
90	const size_t byte_pos = x / 8;	82,663✔
91	const size_t bit_pos = x % 8;	82,663✔
92
93	const uint8_t mask = (1 << bit_pos);	82,663✔
94
95	if(result[byte_pos] & mask) {	82,663✔
96	continue; // already set this bit	1,024✔
97	}
98
99	result[byte_pos] \|= mask;	81,639✔
100	bits_set++;	81,639✔
101	}
102
103	return result;	2,646✔
104	}	×
105
106	} // namespace
107
108	void mceliece_encrypt(secure_vector<uint8_t>& ciphertext_out,	2,646✔
109	secure_vector<uint8_t>& error_mask_out,
110	const secure_vector<uint8_t>& plaintext,
111	const McEliece_PublicKey& key,
112	RandomNumberGenerator& rng) {
113	const uint16_t code_length = static_cast<uint16_t>(key.get_code_length());	2,646✔
114
115	secure_vector<uint8_t> error_mask = create_random_error_vector(code_length, key.get_t(), rng);	2,646✔
116
117	secure_vector<uint8_t> ciphertext =	2,646✔
118	mult_by_pubkey(plaintext, key.get_public_matrix(), key.get_code_length(), key.get_t());	2,646✔
119
120	ciphertext ^= error_mask;	2,646✔
121
122	ciphertext_out.swap(ciphertext);	2,646✔
123	error_mask_out.swap(error_mask);	2,646✔
124	}	2,646✔
125
126	} // namespace Botan

randombit / botan / 5123321399

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