28278764342

Committed 26 Jun 2026 01:00PM UTC coverage: 89.352% (-0.002%) from 89.354%

Build # 28278764342

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Merge pull request #5700 from Rohde-Schwarz/chore/span_in_tls_msgs_and_exts

[std::span] For TLS message and extension parsing and usage

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/src/lib/stream/ctr/ctr.cpp

/*
* Counter mode
* (C) 1999-2011,2014 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#include <botan/internal/ctr.h>

#include <botan/exceptn.h>
#include <botan/internal/bit_ops.h>
#include <botan/internal/fmt.h>
#include <botan/internal/loadstor.h>

#if defined(BOTAN_HAS_CTR_BE_AVX2) || defined(BOTAN_HAS_CTR_BE_SIMD32)
   #include <botan/internal/cpuid.h>
#endif

namespace Botan {

CTR_BE::CTR_BE(std::unique_ptr<BlockCipher> cipher) :
      m_cipher(std::move(cipher)),
      m_block_size(m_cipher->block_size()),
      m_ctr_size(m_block_size),
      m_ctr_blocks(m_cipher->parallel_bytes() / m_block_size),
      m_counter(m_cipher->parallel_bytes()),
      m_pad(m_counter.size()),
      m_pad_pos(0) {}

CTR_BE::CTR_BE(std::unique_ptr<BlockCipher> cipher, size_t ctr_size) :
      m_cipher(std::move(cipher)),
      m_block_size(m_cipher->block_size()),
      m_ctr_size(ctr_size),
      m_ctr_blocks(m_cipher->parallel_bytes() / m_block_size),
      m_counter(m_cipher->parallel_bytes()),
      m_pad(m_counter.size()),
      m_pad_pos(0) {
   BOTAN_ARG_CHECK(m_ctr_size >= 4 && m_ctr_size <= m_block_size, "Invalid CTR-BE counter size");
}

void CTR_BE::clear() {
   m_cipher->clear();
   zeroise(m_pad);
   zeroise(m_counter);
   zap(m_iv);
   m_pad_pos = 0;
   m_bytes_remaining = 0;
}

std::optional<uint64_t> CTR_BE::remaining_keystream_bytes() const {
   if(!has_keying_material() || m_ctr_size >= sizeof(uint64_t)) {
      return std::nullopt;
   }
   return m_bytes_remaining;
}

size_t CTR_BE::default_iv_length() const {
   return m_block_size;
}

bool CTR_BE::valid_iv_length(size_t iv_len) const {
   return (iv_len <= m_block_size);
}

size_t CTR_BE::buffer_size() const {
   return m_pad.size();
}

Key_Length_Specification CTR_BE::key_spec() const {
   return m_cipher->key_spec();
}

std::unique_ptr<StreamCipher> CTR_BE::new_object() const {
   return std::make_unique<CTR_BE>(m_cipher->new_object(), m_ctr_size);
}

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

void CTR_BE::key_schedule(std::span<const uint8_t> key) {
   m_cipher->set_key(key);

   // Set a default all-zeros IV
   set_iv(nullptr, 0);
}

std::string CTR_BE::name() const {
   if(m_ctr_size == m_block_size) {
      return fmt("CTR-BE({})", m_cipher->name());
   } else {
      return fmt("CTR-BE({},{})", m_cipher->name(), m_ctr_size);
   }
}

void CTR_BE::cipher_bytes(const uint8_t in[], uint8_t out[], size_t length) {
   assert_key_material_set();

   if(m_ctr_size < sizeof(uint64_t)) {
      if(length > m_bytes_remaining) {
         throw Invalid_State(fmt("CTR_BE with {}-byte counter has exhausted its keystream", m_ctr_size));
      }
      m_bytes_remaining -= length;
   }

   const uint8_t* pad_bits = m_pad.data();
   const size_t pad_size = m_pad.size();

   /* Consume any already computed keystream in m_pad */

   if(m_pad_pos > 0) {
      const size_t avail = pad_size - m_pad_pos;
      const size_t take = std::min(length, avail);
      xor_buf(out, in, pad_bits + m_pad_pos, take);
      length -= take;
      in += take;
      out += take;
      m_pad_pos += take;

      if(take == avail) {
         add_counter(m_ctr_blocks);
         m_cipher->encrypt_n(m_counter.data(), m_pad.data(), m_ctr_blocks);
         m_pad_pos = 0;
      }
   }

   /* Bulk processing */

   [[maybe_unused]] const bool can_use_bs16_ctr4_fastpath = m_block_size == 16 && m_ctr_size == 4 && pad_size % 64 == 0;

#if defined(BOTAN_HAS_CTR_BE_AVX2)
   if(length >= pad_size && can_use_bs16_ctr4_fastpath && CPUID::has(CPUID::Feature::AVX2)) {
      const size_t consumed = ctr_proc_bs16_ctr4_avx2(in, out, length);
      in += consumed;
      out += consumed;
      length -= consumed;
   }
#endif

#if defined(BOTAN_HAS_CTR_BE_SIMD32)
   if(length >= pad_size && can_use_bs16_ctr4_fastpath && CPUID::has(CPUID::Feature::SIMD_4X32)) {
      const size_t consumed = ctr_proc_bs16_ctr4_simd32(in, out, length);
      in += consumed;
      out += consumed;
      length -= consumed;
   }
#endif

   while(length >= pad_size) {
      xor_buf(out, in, pad_bits, pad_size);
      length -= pad_size;
      in += pad_size;
      out += pad_size;

      add_counter(m_ctr_blocks);
      m_cipher->encrypt_n(m_counter.data(), m_pad.data(), m_ctr_blocks);
   }

   /* Now if length > 0 then we have some remaining text, and m_pad is full - consume as required */
   if(length > 0) {
      xor_buf(out, in, pad_bits, length);
      m_pad_pos = length;
   }
}

void CTR_BE::generate_keystream(uint8_t out[], size_t length) {
   assert_key_material_set();

   if(m_ctr_size < sizeof(uint64_t)) {
      if(length > m_bytes_remaining) {
         throw Invalid_State(fmt("CTR_BE with {}-byte counter has exhausted its keystream", m_ctr_size));
      }
      m_bytes_remaining -= length;
   }

   const size_t avail = m_pad.size() - m_pad_pos;
   const size_t take = std::min(length, avail);
   copy_mem(out, &m_pad[m_pad_pos], take);
   length -= take;
   out += take;
   m_pad_pos += take;

   while(length >= m_pad.size()) {
      add_counter(m_ctr_blocks);
      m_cipher->encrypt_n(m_counter.data(), out, m_ctr_blocks);

      length -= m_pad.size();
      out += m_pad.size();
   }

   if(m_pad_pos == m_pad.size()) {
      add_counter(m_ctr_blocks);
      m_cipher->encrypt_n(m_counter.data(), m_pad.data(), m_ctr_blocks);
      m_pad_pos = 0;
   }

   copy_mem(out, m_pad.data(), length);
   m_pad_pos += length;
   BOTAN_ASSERT_NOMSG(m_pad_pos < m_pad.size());
}

void CTR_BE::set_iv_bytes(const uint8_t iv[], size_t iv_len) {
   if(!valid_iv_length(iv_len)) {
      throw Invalid_IV_Length(name(), iv_len);
   }

   m_iv.resize(m_block_size);
   zeroise(m_iv);
   copy_mem(m_iv.data(), iv, iv_len);

   seek(0);
}

void CTR_BE::add_counter(const uint64_t counter) {
   const size_t ctr_size = m_ctr_size;
   const size_t ctr_blocks = m_ctr_blocks;
   const size_t BS = m_block_size;

   if(ctr_size == 4) {
      const size_t off = (BS - 4);
      const uint32_t low32 = static_cast<uint32_t>(counter + load_be<uint32_t>(&m_counter[off], 0));

      for(size_t i = 0; i != ctr_blocks; ++i) {
         store_be(uint32_t(low32 + i), &m_counter[i * BS + off]);
      }
   } else if(ctr_size == 8) {
      const size_t off = (BS - 8);
      const uint64_t low64 = counter + load_be<uint64_t>(&m_counter[off], 0);

      for(size_t i = 0; i != ctr_blocks; ++i) {
         store_be(uint64_t(low64 + i), &m_counter[i * BS + off]);
      }
   } else if(ctr_size == 16) {
      const size_t off = (BS - 16);
      uint64_t b0 = load_be<uint64_t>(&m_counter[off], 0);
      uint64_t b1 = load_be<uint64_t>(&m_counter[off], 1);
      b1 += counter;
      b0 += (b1 < counter) ? 1 : 0;  // carry

      for(size_t i = 0; i != ctr_blocks; ++i) {
         store_be(b0, &m_counter[i * BS + off]);
         store_be(b1, &m_counter[i * BS + off + 8]);
         b1 += 1;
         if(b1 == 0) {
            b0 += 1;  // carry
         }
      }
   } else {
      for(size_t i = 0; i != ctr_blocks; ++i) {
         uint64_t local_counter = counter;
         uint16_t carry = static_cast<uint8_t>(local_counter);
         for(size_t j = 0; (carry > 0 || local_counter > 0) && j != ctr_size; ++j) {
            const size_t off = i * BS + (BS - 1 - j);
            const uint16_t cnt = static_cast<uint16_t>(m_counter[off]) + carry;
            m_counter[off] = static_cast<uint8_t>(cnt);
            local_counter = (local_counter >> 8);
            carry = (cnt >> 8) + static_cast<uint8_t>(local_counter);
         }
      }
   }
}

void CTR_BE::seek(uint64_t offset) {
   assert_key_material_set();

   if(m_ctr_size < sizeof(uint64_t)) {
      const uint64_t requested_block = offset / m_block_size;
      const uint64_t max_blocks = uint64_t{1} << (8 * m_ctr_size);
      if(requested_block >= max_blocks) {
         throw Invalid_Argument(fmt("CTR_BE::seek offset {} exceeds {}-byte counter range", offset, m_ctr_size));
      }

      m_bytes_remaining = max_blocks * m_block_size - offset;
   }

   const uint64_t base_counter = m_ctr_blocks * (offset / m_counter.size());

   zeroise(m_counter);
   BOTAN_ASSERT_NOMSG(m_counter.size() >= m_iv.size());
   copy_mem(m_counter.data(), m_iv.data(), m_iv.size());

   const size_t BS = m_block_size;

   // Set m_counter blocks to IV, IV + 1, ... IV + n

   if(m_ctr_size == 4 && BS >= 8) {
      const uint32_t low32 = load_be<uint32_t>(&m_counter[BS - 4], 0);

      if(m_ctr_blocks >= 4 && is_power_of_2(m_ctr_blocks)) {
         size_t written = 1;
         while(written < m_ctr_blocks) {
            copy_mem(&m_counter[written * BS], &m_counter[0], BS * written);  // NOLINT(*container-data-pointer)
            written *= 2;
         }
      } else {
         for(size_t i = 1; i != m_ctr_blocks; ++i) {
            copy_mem(&m_counter[i * BS], &m_counter[0], BS - 4);  // NOLINT(*container-data-pointer)
         }
      }

      for(size_t i = 1; i != m_ctr_blocks; ++i) {
         const uint32_t c = static_cast<uint32_t>(low32 + i);
         store_be(c, &m_counter[(BS - 4) + i * BS]);
      }
   } else {
      // do everything sequentially:
      for(size_t i = 1; i != m_ctr_blocks; ++i) {
         copy_mem(&m_counter[i * BS], &m_counter[(i - 1) * BS], BS);

         for(size_t j = 0; j != m_ctr_size; ++j) {
            uint8_t& c = m_counter[i * BS + (BS - 1 - j)];
            c += 1;
            if(c > 0) {
               break;
            }
         }
      }
   }

   if(base_counter > 0) {
      add_counter(base_counter);
   }

   m_cipher->encrypt_n(m_counter.data(), m_pad.data(), m_ctr_blocks);
   m_pad_pos = offset % m_counter.size();
}
}  // namespace Botan

1	/*
2	* Counter mode
3	* (C) 1999-2011,2014 Jack Lloyd
4	*
5	* Botan is released under the Simplified BSD License (see license.txt)
6	*/
7
8	#include <botan/internal/ctr.h>
9
10	#include <botan/exceptn.h>
11	#include <botan/internal/bit_ops.h>
12	#include <botan/internal/fmt.h>
13	#include <botan/internal/loadstor.h>
14
15	#if defined(BOTAN_HAS_CTR_BE_AVX2) \|\| defined(BOTAN_HAS_CTR_BE_SIMD32)
16	#include <botan/internal/cpuid.h>
17	#endif
18
19	namespace Botan {
20
21	CTR_BE::CTR_BE(std::unique_ptr<BlockCipher> cipher) :	1,214✔
22	m_cipher(std::move(cipher)),	1,214✔
23	m_block_size(m_cipher->block_size()),	1,214✔
24	m_ctr_size(m_block_size),	1,214✔
25	m_ctr_blocks(m_cipher->parallel_bytes() / m_block_size),	1,214✔
26	m_counter(m_cipher->parallel_bytes()),	2,428✔
27	m_pad(m_counter.size()),	1,214✔
28	m_pad_pos(0) {}	2,428✔
29
30	CTR_BE::CTR_BE(std::unique_ptr<BlockCipher> cipher, size_t ctr_size) :	102,443✔
31	m_cipher(std::move(cipher)),	102,443✔
32	m_block_size(m_cipher->block_size()),	102,443✔
33	m_ctr_size(ctr_size),	102,443✔
34	m_ctr_blocks(m_cipher->parallel_bytes() / m_block_size),	102,443✔
35	m_counter(m_cipher->parallel_bytes()),	204,886✔
36	m_pad(m_counter.size()),	102,443✔
37	m_pad_pos(0) {	204,886✔
38	BOTAN_ARG_CHECK(m_ctr_size >= 4 && m_ctr_size <= m_block_size, "Invalid CTR-BE counter size");	102,443✔
39	}	102,443✔
40
41	void CTR_BE::clear() {	7,504✔
42	m_cipher->clear();	7,504✔
43	zeroise(m_pad);	3,900,320✔
44	zeroise(m_counter);	7,504✔
45	zap(m_iv);	7,504✔
46	m_pad_pos = 0;	7,504✔
47	m_bytes_remaining = 0;	7,504✔
48	}	7,504✔
49
50	std::optional<uint64_t> CTR_BE::remaining_keystream_bytes() const {	5✔
51	if(!has_keying_material() \|\| m_ctr_size >= sizeof(uint64_t)) {	5✔
52	return std::nullopt;	1✔
53	}
54	return m_bytes_remaining;	4✔
55	}
56
57	size_t CTR_BE::default_iv_length() const {	3,280✔
58	return m_block_size;	3,280✔
59	}
60
61	bool CTR_BE::valid_iv_length(size_t iv_len) const {	336,686✔
62	return (iv_len <= m_block_size);	336,686✔
63	}
64
65	size_t CTR_BE::buffer_size() const {	1,661✔
66	return m_pad.size();	1,661✔
67	}
68
69	Key_Length_Specification CTR_BE::key_spec() const {	211,153✔
70	return m_cipher->key_spec();	211,153✔
71	}
72
73	std::unique_ptr<StreamCipher> CTR_BE::new_object() const {	2,440✔
74	return std::make_unique<CTR_BE>(m_cipher->new_object(), m_ctr_size);	2,440✔
75	}
76
77	bool CTR_BE::has_keying_material() const {	21,043,012✔
78	return m_cipher->has_keying_material();	21,043,012✔
79	}
80
81	void CTR_BE::key_schedule(std::span<const uint8_t> key) {	107,070✔
82	m_cipher->set_key(key);	107,070✔
83
84	// Set a default all-zeros IV
85	set_iv(nullptr, 0);	107,070✔
86	}	107,070✔
87
88	std::string CTR_BE::name() const {	13,459✔
89	if(m_ctr_size == m_block_size) {	13,459✔
90	return fmt("CTR-BE({})", m_cipher->name());	13,065✔
91	} else {
92	return fmt("CTR-BE({},{})", m_cipher->name(), m_ctr_size);	394✔
93	}
94	}
95
96	void CTR_BE::cipher_bytes(const uint8_t in[], uint8_t out[], size_t length) {	138,537✔
97	assert_key_material_set();	138,537✔
98
99	if(m_ctr_size < sizeof(uint64_t)) {	135,241✔
100	if(length > m_bytes_remaining) {	112,359✔
101	throw Invalid_State(fmt("CTR_BE with {}-byte counter has exhausted its keystream", m_ctr_size));	1✔
102	}
103	m_bytes_remaining -= length;	112,358✔
104	}
105
106	const uint8_t* pad_bits = m_pad.data();	135,240✔
107	const size_t pad_size = m_pad.size();	135,240✔
108
109	/* Consume any already computed keystream in m_pad */
110
111	if(m_pad_pos > 0) {	135,240✔
112	const size_t avail = pad_size - m_pad_pos;	107,961✔
113	const size_t take = std::min(length, avail);	107,961✔
114	xor_buf(out, in, pad_bits + m_pad_pos, take);	107,961✔
115	length -= take;	107,961✔
116	in += take;	107,961✔
117	out += take;	107,961✔
118	m_pad_pos += take;	107,961✔
119
120	if(take == avail) {	107,961✔
121	add_counter(m_ctr_blocks);	2,730✔
122	m_cipher->encrypt_n(m_counter.data(), m_pad.data(), m_ctr_blocks);	2,730✔
123	m_pad_pos = 0;	2,730✔
124	}
125	}
126
127	/* Bulk processing */
128
129	[[maybe_unused]] const bool can_use_bs16_ctr4_fastpath = m_block_size == 16 && m_ctr_size == 4 && pad_size % 64 == 0;	135,240✔
130
131	#if defined(BOTAN_HAS_CTR_BE_AVX2)
132	if(length >= pad_size && can_use_bs16_ctr4_fastpath && CPUID::has(CPUID::Feature::AVX2)) {	135,240✔
133	const size_t consumed = ctr_proc_bs16_ctr4_avx2(in, out, length);	1,457✔
134	in += consumed;	1,457✔
135	out += consumed;	1,457✔
136	length -= consumed;	1,457✔
137	}
138	#endif
139
140	#if defined(BOTAN_HAS_CTR_BE_SIMD32)
141	if(length >= pad_size && can_use_bs16_ctr4_fastpath && CPUID::has(CPUID::Feature::SIMD_4X32)) {	135,240✔
142	const size_t consumed = ctr_proc_bs16_ctr4_simd32(in, out, length);	6✔
143	in += consumed;	6✔
144	out += consumed;	6✔
145	length -= consumed;	6✔
146	}
147	#endif
148
149	while(length >= pad_size) {	135,398✔
150	xor_buf(out, in, pad_bits, pad_size);	158✔
151	length -= pad_size;	158✔
152	in += pad_size;	158✔
153	out += pad_size;	158✔
154
155	add_counter(m_ctr_blocks);	158✔
156	m_cipher->encrypt_n(m_counter.data(), m_pad.data(), m_ctr_blocks);	158✔
157	}
158
159	/* Now if length > 0 then we have some remaining text, and m_pad is full - consume as required */
160	if(length > 0) {	135,240✔
161	xor_buf(out, in, pad_bits, length);	29,343✔
162	m_pad_pos = length;	29,343✔
163	}
164	}	135,240✔
165
166	void CTR_BE::generate_keystream(uint8_t out[], size_t length) {	20,649,074✔
167	assert_key_material_set();	20,649,074✔
168
169	if(m_ctr_size < sizeof(uint64_t)) {	20,649,074✔
170	if(length > m_bytes_remaining) {	33✔
171	throw Invalid_State(fmt("CTR_BE with {}-byte counter has exhausted its keystream", m_ctr_size));	×
172	}
173	m_bytes_remaining -= length;	33✔
174	}
175
176	const size_t avail = m_pad.size() - m_pad_pos;	20,649,074✔
177	const size_t take = std::min(length, avail);	20,649,074✔
178	copy_mem(out, &m_pad[m_pad_pos], take);	20,649,074✔
179	length -= take;	20,649,074✔
180	out += take;	20,649,074✔
181	m_pad_pos += take;	20,649,074✔
182
183	while(length >= m_pad.size()) {	20,649,074✔
184	add_counter(m_ctr_blocks);	×
185	m_cipher->encrypt_n(m_counter.data(), out, m_ctr_blocks);	×
186
187	length -= m_pad.size();	×
188	out += m_pad.size();	×
189	}
190
191	if(m_pad_pos == m_pad.size()) {	20,649,074✔
192	add_counter(m_ctr_blocks);	83,050✔
193	m_cipher->encrypt_n(m_counter.data(), m_pad.data(), m_ctr_blocks);	83,050✔
194	m_pad_pos = 0;	83,050✔
195	}
196
197	copy_mem(out, m_pad.data(), length);	20,649,074✔
198	m_pad_pos += length;	20,649,074✔
199	BOTAN_ASSERT_NOMSG(m_pad_pos < m_pad.size());	20,649,074✔
200	}	20,649,074✔
201
202	void CTR_BE::set_iv_bytes(const uint8_t iv[], size_t iv_len) {	237,293✔
203	if(!valid_iv_length(iv_len)) {	237,293✔
204	throw Invalid_IV_Length(name(), iv_len);	3,288✔
205	}
206
207	m_iv.resize(m_block_size);	235,649✔
208	zeroise(m_iv);	235,649✔
209	copy_mem(m_iv.data(), iv, iv_len);	235,649✔
210
211	seek(0);	235,649✔
212	}	233,695✔
213
214	void CTR_BE::add_counter(const uint64_t counter) {	85,977✔
215	const size_t ctr_size = m_ctr_size;	85,977✔
216	const size_t ctr_blocks = m_ctr_blocks;	85,977✔
217	const size_t BS = m_block_size;	85,977✔
218
219	if(ctr_size == 4) {	85,977✔
220	const size_t off = (BS - 4);	2,713✔
221	const uint32_t low32 = static_cast<uint32_t>(counter + load_be<uint32_t>(&m_counter[off], 0));	2,713✔
222
223	for(size_t i = 0; i != ctr_blocks; ++i) {	65,761✔
224	store_be(uint32_t(low32 + i), &m_counter[i * BS + off]);	63,048✔
225	}
226	} else if(ctr_size == 8) {	83,264✔
227	const size_t off = (BS - 8);	41✔
228	const uint64_t low64 = counter + load_be<uint64_t>(&m_counter[off], 0);	41✔
229
230	for(size_t i = 0; i != ctr_blocks; ++i) {	1,673✔
231	store_be(uint64_t(low64 + i), &m_counter[i * BS + off]);	1,632✔
232	}
233	} else if(ctr_size == 16) {	83,223✔
234	const size_t off = (BS - 16);	83,223✔
235	uint64_t b0 = load_be<uint64_t>(&m_counter[off], 0);	83,223✔
236	uint64_t b1 = load_be<uint64_t>(&m_counter[off], 1);	83,223✔
237	b1 += counter;	83,223✔
238	b0 += (b1 < counter) ? 1 : 0; // carry	83,223✔
239
240	for(size_t i = 0; i != ctr_blocks; ++i) {	2,746,359✔
241	store_be(b0, &m_counter[i * BS + off]);	2,663,136✔
242	store_be(b1, &m_counter[i * BS + off + 8]);	2,663,136✔
243	b1 += 1;	2,663,136✔
244	if(b1 == 0) {	2,663,136✔
245	b0 += 1; // carry	×
246	}
247	}
248	} else {
249	for(size_t i = 0; i != ctr_blocks; ++i) {	×
250	uint64_t local_counter = counter;	×
251	uint16_t carry = static_cast<uint8_t>(local_counter);	×
252	for(size_t j = 0; (carry > 0 \|\| local_counter > 0) && j != ctr_size; ++j) {	×
253	const size_t off = i * BS + (BS - 1 - j);	×
254	const uint16_t cnt = static_cast<uint16_t>(m_counter[off]) + carry;	×
255	m_counter[off] = static_cast<uint8_t>(cnt);	×
256	local_counter = (local_counter >> 8);	×
257	carry = (cnt >> 8) + static_cast<uint8_t>(local_counter);	×
258	}
259	}
260	}
261	}	85,977✔
262
263	void CTR_BE::seek(uint64_t offset) {	243,693✔
264	assert_key_material_set();	243,693✔
265
266	if(m_ctr_size < sizeof(uint64_t)) {	240,099✔
267	const uint64_t requested_block = offset / m_block_size;	20,702✔
268	const uint64_t max_blocks = uint64_t{1} << (8 * m_ctr_size);	20,702✔
269	if(requested_block >= max_blocks) {	20,702✔
270	throw Invalid_Argument(fmt("CTR_BE::seek offset {} exceeds {}-byte counter range", offset, m_ctr_size));	2✔
271	}
272
273	m_bytes_remaining = max_blocks * m_block_size - offset;	20,701✔
274	}
275
276	const uint64_t base_counter = m_ctr_blocks * (offset / m_counter.size());	240,098✔
277
278	zeroise(m_counter);	240,098✔
279	BOTAN_ASSERT_NOMSG(m_counter.size() >= m_iv.size());	240,098✔
280	copy_mem(m_counter.data(), m_iv.data(), m_iv.size());	240,098✔
281
282	const size_t BS = m_block_size;	240,098✔
283
284	// Set m_counter blocks to IV, IV + 1, ... IV + n
285
286	if(m_ctr_size == 4 && BS >= 8) {	240,098✔
287	const uint32_t low32 = load_be<uint32_t>(&m_counter[BS - 4], 0);	20,673✔
288
289	if(m_ctr_blocks >= 4 && is_power_of_2(m_ctr_blocks)) {	20,673✔
290	size_t written = 1;
291	while(written < m_ctr_blocks) {	121,152✔
292	copy_mem(&m_counter[written * BS], &m_counter[0], BS * written); // NOLINT(*container-data-pointer)	100,479✔
293	written *= 2;	100,479✔
294	}
295	} else {
296	for(size_t i = 1; i != m_ctr_blocks; ++i) {	×
297	copy_mem(&m_counter[i * BS], &m_counter[0], BS - 4); // NOLINT(*container-data-pointer)	×
298	}
299	}
300
301	for(size_t i = 1; i != m_ctr_blocks; ++i) {	631,256✔
302	const uint32_t c = static_cast<uint32_t>(low32 + i);	610,583✔
303	store_be(c, &m_counter[(BS - 4) + i * BS]);	610,583✔
304	}
305	} else {
306	// do everything sequentially:
307	for(size_t i = 1; i != m_ctr_blocks; ++i) {	7,510,548✔
308	copy_mem(&m_counter[i * BS], &m_counter[(i - 1) * BS], BS);	7,291,123✔
309
310	for(size_t j = 0; j != m_ctr_size; ++j) {	7,300,613✔
311	uint8_t& c = m_counter[i * BS + (BS - 1 - j)];	7,300,551✔
312	c += 1;	7,300,551✔
313	if(c > 0) {	7,300,551✔
314	break;
315	}
316	}
317	}
318	}
319
320	if(base_counter > 0) {	240,098✔
321	add_counter(base_counter);	39✔
322	}
323
324	m_cipher->encrypt_n(m_counter.data(), m_pad.data(), m_ctr_blocks);	240,098✔
325	m_pad_pos = offset % m_counter.size();	240,098✔
326	}	240,098✔
327	} // namespace Botan

randombit / botan / 28278764342

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