6144099563

Committed 11 Sep 2023 08:48AM UTC coverage: 91.693% (-0.02%) from 91.711%

Build # 6144099563

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push

github

Committed by

web-flow

Commit Message

Merge pull request #3681 from randombit/span/bufcomp

std::span for Buffered_Computation

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78567 of 85685 relevant lines covered (91.69%)

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98.25

/src/lib/mac/cmac/cmac.cpp

/*
* CMAC
* (C) 1999-2007,2014 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#include <botan/internal/cmac.h>

#include <botan/exceptn.h>
#include <botan/internal/fmt.h>
#include <botan/internal/poly_dbl.h>
#include <botan/internal/stl_util.h>

namespace Botan {

/*
* Update an CMAC Calculation
*/
void CMAC::add_data(std::span<const uint8_t> input) {
   const size_t bs = output_length();

   buffer_insert(m_buffer, m_position, input.data(), input.size());
   if(m_position + input.size() > bs) {
      xor_buf(m_state, m_buffer, bs);
      m_cipher->encrypt(m_state);

      BufferSlicer in(input);
      in.skip(bs - m_position);
      while(in.remaining() > bs) {
         xor_buf(m_state, in.take(bs), bs);
         m_cipher->encrypt(m_state);
      }

      const auto remaining = in.take(in.remaining());
      copy_mem(m_buffer.data(), remaining.data(), remaining.size());
      m_position = remaining.size();
   } else {
      m_position += input.size();
   }
}

/*
* Finalize an CMAC Calculation
*/
void CMAC::final_result(std::span<uint8_t> mac) {
   xor_buf(m_state, m_buffer, m_position);

   if(m_position == output_length()) {
      xor_buf(m_state, m_B, output_length());
   } else {
      m_state[m_position] ^= 0x80;
      xor_buf(m_state, m_P, output_length());
   }

   m_cipher->encrypt(m_state);

   copy_mem(mac.data(), m_state.data(), output_length());

   zeroise(m_state);
   zeroise(m_buffer);
   m_position = 0;
}

bool CMAC::has_keying_material() const {
   return m_cipher->has_keying_material();
}

/*
* CMAC Key Schedule
*/
void CMAC::key_schedule(const uint8_t key[], size_t length) {
   clear();
   m_cipher->set_key(key, length);
   m_cipher->encrypt(m_B);
   poly_double_n(m_B.data(), m_B.size());
   poly_double_n(m_P.data(), m_B.data(), m_P.size());
}

/*
* Clear memory of sensitive data
*/
void CMAC::clear() {
   m_cipher->clear();
   zeroise(m_state);
   zeroise(m_buffer);
   zeroise(m_B);
   zeroise(m_P);
   m_position = 0;
}

/*
* Return the name of this type
*/
std::string CMAC::name() const {
   return fmt("CMAC({})", m_cipher->name());
}

/*
* Return a new_object of this object
*/
std::unique_ptr<MessageAuthenticationCode> CMAC::new_object() const {
   return std::make_unique<CMAC>(m_cipher->new_object());
}

/*
* CMAC Constructor
*/
CMAC::CMAC(std::unique_ptr<BlockCipher> cipher) : m_cipher(std::move(cipher)), m_block_size(m_cipher->block_size()) {
   if(poly_double_supported_size(m_block_size) == false) {
      throw Invalid_Argument(fmt("CMAC cannot use the {} bit cipher {}", m_block_size * 8, m_cipher->name()));
   }

   m_state.resize(output_length());
   m_buffer.resize(output_length());
   m_B.resize(output_length());
   m_P.resize(output_length());
   m_position = 0;
}

}  // namespace Botan

1	/*
2	* CMAC
3	* (C) 1999-2007,2014 Jack Lloyd
4	*
5	* Botan is released under the Simplified BSD License (see license.txt)
6	*/
7
8	#include <botan/internal/cmac.h>
9
10	#include <botan/exceptn.h>
11	#include <botan/internal/fmt.h>
12	#include <botan/internal/poly_dbl.h>
13	#include <botan/internal/stl_util.h>
14
15	namespace Botan {
16
17	/*
18	* Update an CMAC Calculation
19	*/
20	void CMAC::add_data(std::span<const uint8_t> input) {	1,033,531✔
21	const size_t bs = output_length();	1,033,531✔
22
23	buffer_insert(m_buffer, m_position, input.data(), input.size());
24	if(m_position + input.size() > bs) {	1,033,531✔
25	xor_buf(m_state, m_buffer, bs);	14,796✔
26	m_cipher->encrypt(m_state);	14,796✔
27
28	BufferSlicer in(input);	13,578✔
29	in.skip(bs - m_position);	13,578✔
30	while(in.remaining() > bs) {	29,284✔
31	xor_buf(m_state, in.take(bs), bs);	15,706✔
32	m_cipher->encrypt(m_state);	44,990✔
33	}
34
35	const auto remaining = in.take(in.remaining());	13,578✔
36	copy_mem(m_buffer.data(), remaining.data(), remaining.size());	13,578✔
37	m_position = remaining.size();	13,578✔
38	} else {
39	m_position += input.size();	1,018,735✔
40	}
41	}	1,032,313✔
42
43	/*
44	* Finalize an CMAC Calculation
45	*/
46	void CMAC::final_result(std::span<uint8_t> mac) {	892,136✔
47	xor_buf(m_state, m_buffer, m_position);	892,136✔
48
49	if(m_position == output_length()) {	892,136✔
50	xor_buf(m_state, m_B, output_length());	878,740✔
51	} else {
52	m_state[m_position] ^= 0x80;	13,396✔
53	xor_buf(m_state, m_P, output_length());	13,396✔
54	}
55
56	m_cipher->encrypt(m_state);	892,136✔
57
58	copy_mem(mac.data(), m_state.data(), output_length());	890,130✔
59
60	zeroise(m_state);	890,130✔
61	zeroise(m_buffer);	890,130✔
62	m_position = 0;	890,130✔
63	}	890,130✔
64
65	bool CMAC::has_keying_material() const {	1,140✔
66	return m_cipher->has_keying_material();	1,140✔
67	}
68
69	/*
70	* CMAC Key Schedule
71	*/
72	void CMAC::key_schedule(const uint8_t key[], size_t length) {	2,571✔
73	clear();	2,571✔
74	m_cipher->set_key(key, length);	2,571✔
75	m_cipher->encrypt(m_B);	2,571✔
76	poly_double_n(m_B.data(), m_B.size());	2,571✔
77	poly_double_n(m_P.data(), m_B.data(), m_P.size());	2,571✔
78	}	2,571✔
79
80	/*
81	* Clear memory of sensitive data
82	*/
83	void CMAC::clear() {	3,675✔
84	m_cipher->clear();	3,675✔
85	zeroise(m_state);	3,675✔
86	zeroise(m_buffer);	3,675✔
87	zeroise(m_B);	3,675✔
88	zeroise(m_P);	3,675✔
89	m_position = 0;	3,675✔
90	}	3,675✔
91
92	/*
93	* Return the name of this type
94	*/
95	std::string CMAC::name() const {	1,195✔
96	return fmt("CMAC({})", m_cipher->name());	1,195✔
97	}
98
99	/*
100	* Return a new_object of this object
101	*/
102	std::unique_ptr<MessageAuthenticationCode> CMAC::new_object() const {	430✔
103	return std::make_unique<CMAC>(m_cipher->new_object());	430✔
104	}
105
106	/*
107	* CMAC Constructor
108	*/
109	CMAC::CMAC(std::unique_ptr<BlockCipher> cipher) : m_cipher(std::move(cipher)), m_block_size(m_cipher->block_size()) {	3,344✔
110	if(poly_double_supported_size(m_block_size) == false) {	3,344✔
111	throw Invalid_Argument(fmt("CMAC cannot use the {} bit cipher {}", m_block_size * 8, m_cipher->name()));	×
112	}
113
114	m_state.resize(output_length());	3,344✔
115	m_buffer.resize(output_length());	3,344✔
116	m_B.resize(output_length());	3,344✔
117	m_P.resize(output_length());	3,344✔
118	m_position = 0;	3,344✔
119	}	3,344✔
120
121	} // namespace Botan

randombit / botan / 6144099563

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