/src/botan/src/lib/pbkdf/argon2/argon2.cpp

Source (jump to first uncovered line)
/**
* (C) 2018,2019,2022 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#include <botan/argon2.h>

#include <botan/exceptn.h>
#include <botan/hash.h>
#include <botan/mem_ops.h>
#include <botan/internal/fmt.h>
#include <botan/internal/loadstor.h>
#include <botan/internal/rotate.h>
#include <limits>

#if defined(BOTAN_HAS_THREAD_UTILS)
   #include <botan/internal/thread_pool.h>
#endif

#if defined(BOTAN_HAS_ARGON2_AVX2) || defined(BOTAN_HAS_ARGON2_SSSE3)
   #include <botan/internal/cpuid.h>
#endif

namespace Botan {

namespace {

const size_t SYNC_POINTS = 4;

void argon2_H0(uint8_t H0[64],
               HashFunction& blake2b,
               size_t output_len,
               const char* password,
               size_t password_len,
               const uint8_t salt[],
               size_t salt_len,
               const uint8_t key[],
               size_t key_len,
               const uint8_t ad[],
               size_t ad_len,
               size_t y,
               size_t p,
               size_t M,
               size_t t) {
   const uint8_t v = 19;  // Argon2 version code

   blake2b.update_le(static_cast<uint32_t>(p));
   blake2b.update_le(static_cast<uint32_t>(output_len));
   blake2b.update_le(static_cast<uint32_t>(M));
   blake2b.update_le(static_cast<uint32_t>(t));
   blake2b.update_le(static_cast<uint32_t>(v));
   blake2b.update_le(static_cast<uint32_t>(y));

   blake2b.update_le(static_cast<uint32_t>(password_len));
   blake2b.update(cast_char_ptr_to_uint8(password), password_len);

   blake2b.update_le(static_cast<uint32_t>(salt_len));
   blake2b.update(salt, salt_len);

   blake2b.update_le(static_cast<uint32_t>(key_len));
   blake2b.update(key, key_len);

   blake2b.update_le(static_cast<uint32_t>(ad_len));
   blake2b.update(ad, ad_len);

   blake2b.final(H0);
}

void extract_key(uint8_t output[], size_t output_len, const secure_vector<uint64_t>& B, size_t memory, size_t threads) {
   const size_t lanes = memory / threads;

   uint64_t sum[128] = {0};

   for(size_t lane = 0; lane != threads; ++lane) {
      const size_t start = 128 * (lane * lanes + lanes - 1);
      const size_t end = 128 * (lane * lanes + lanes);

      for(size_t j = start; j != end; ++j) {
         sum[j % 128] ^= B[j];
      }
   }

   if(output_len <= 64) {
      auto blake2b = HashFunction::create_or_throw(fmt("BLAKE2b({})", output_len * 8));
      blake2b->update_le(static_cast<uint32_t>(output_len));
      for(size_t i = 0; i != 128; ++i) {
         blake2b->update_le(sum[i]);
      }
      blake2b->final(output);
   } else {
      secure_vector<uint8_t> T(64);

      auto blake2b = HashFunction::create_or_throw("BLAKE2b(512)");
      blake2b->update_le(static_cast<uint32_t>(output_len));
      for(size_t i = 0; i != 128; ++i) {
         blake2b->update_le(sum[i]);
      }
      blake2b->final(&T[0]);

      while(output_len > 64) {
         copy_mem(output, &T[0], 32);
         output_len -= 32;
         output += 32;

         if(output_len > 64) {
            blake2b->update(T);
            blake2b->final(&T[0]);
         }
      }

      if(output_len == 64) {
         blake2b->update(T);
         blake2b->final(output);
      } else {
         auto blake2b_f = HashFunction::create_or_throw(fmt("BLAKE2b({})", output_len * 8));
         blake2b_f->update(T);
         blake2b_f->final(output);
      }
   }
}

void init_blocks(
   secure_vector<uint64_t>& B, HashFunction& blake2b, const uint8_t H0[64], size_t memory, size_t threads) {
   BOTAN_ASSERT_NOMSG(B.size() >= threads * 256);

   for(size_t i = 0; i != threads; ++i) {
      const size_t B_off = i * (memory / threads);

      BOTAN_ASSERT_NOMSG(B.size() >= 128 * (B_off + 2));

      for(size_t j = 0; j != 2; ++j) {
         uint8_t T[64] = {0};

         blake2b.update_le(static_cast<uint32_t>(1024));
         blake2b.update(H0, 64);
         blake2b.update_le(static_cast<uint32_t>(j));
         blake2b.update_le(static_cast<uint32_t>(i));
         blake2b.final(T);

         for(size_t k = 0; k != 30; ++k) {
            load_le(&B[128 * (B_off + j) + 4 * k], T, 32 / 8);
            blake2b.update(T, 64);
            blake2b.final(T);
         }

         load_le(&B[128 * (B_off + j) + 4 * 30], T, 64 / 8);
      }
   }
}

BOTAN_FORCE_INLINE void blamka_G(uint64_t& A, uint64_t& B, uint64_t& C, uint64_t& D) {
   A += B + (static_cast<uint64_t>(2) * static_cast<uint32_t>(A)) * static_cast<uint32_t>(B);
   D = rotr<32>(A ^ D);

   C += D + (static_cast<uint64_t>(2) * static_cast<uint32_t>(C)) * static_cast<uint32_t>(D);
   B = rotr<24>(B ^ C);

   A += B + (static_cast<uint64_t>(2) * static_cast<uint32_t>(A)) * static_cast<uint32_t>(B);
   D = rotr<16>(A ^ D);

   C += D + (static_cast<uint64_t>(2) * static_cast<uint32_t>(C)) * static_cast<uint32_t>(D);
   B = rotr<63>(B ^ C);
}

}  // namespace

void Argon2::blamka(uint64_t N[128], uint64_t T[128]) {
#if defined(BOTAN_HAS_ARGON2_AVX2)
   if(CPUID::has_avx2()) {
      return Argon2::blamka_avx2(N, T);
   }
#endif

#if defined(BOTAN_HAS_ARGON2_SSSE3)
   if(CPUID::has_ssse3()) {
      return Argon2::blamka_ssse3(N, T);
   }
#endif

   copy_mem(T, N, 128);

   for(size_t i = 0; i != 128; i += 16) {
      blamka_G(T[i + 0], T[i + 4], T[i + 8], T[i + 12]);
      blamka_G(T[i + 1], T[i + 5], T[i + 9], T[i + 13]);
      blamka_G(T[i + 2], T[i + 6], T[i + 10], T[i + 14]);
      blamka_G(T[i + 3], T[i + 7], T[i + 11], T[i + 15]);

      blamka_G(T[i + 0], T[i + 5], T[i + 10], T[i + 15]);
      blamka_G(T[i + 1], T[i + 6], T[i + 11], T[i + 12]);
      blamka_G(T[i + 2], T[i + 7], T[i + 8], T[i + 13]);
      blamka_G(T[i + 3], T[i + 4], T[i + 9], T[i + 14]);
   }

   for(size_t i = 0; i != 128 / 8; i += 2) {
      blamka_G(T[i + 0], T[i + 32], T[i + 64], T[i + 96]);
      blamka_G(T[i + 1], T[i + 33], T[i + 65], T[i + 97]);
      blamka_G(T[i + 16], T[i + 48], T[i + 80], T[i + 112]);
      blamka_G(T[i + 17], T[i + 49], T[i + 81], T[i + 113]);

      blamka_G(T[i + 0], T[i + 33], T[i + 80], T[i + 113]);
      blamka_G(T[i + 1], T[i + 48], T[i + 81], T[i + 96]);
      blamka_G(T[i + 16], T[i + 49], T[i + 64], T[i + 97]);
      blamka_G(T[i + 17], T[i + 32], T[i + 65], T[i + 112]);
   }

   for(size_t i = 0; i != 128; ++i) {
      N[i] ^= T[i];
   }
}

namespace {

void gen_2i_addresses(uint64_t T[128],
                      uint64_t B[128],
                      size_t n,
                      size_t lane,
                      size_t slice,
                      size_t memory,
                      size_t time,
                      size_t mode,
                      size_t cnt) {
   clear_mem(B, 128);

   B[0] = n;
   B[1] = lane;
   B[2] = slice;
   B[3] = memory;
   B[4] = time;
   B[5] = mode;
   B[6] = cnt;

   for(size_t r = 0; r != 2; ++r) {
      Argon2::blamka(B, T);
   }
}

uint32_t index_alpha(
   uint64_t random, size_t lanes, size_t segments, size_t threads, size_t n, size_t slice, size_t lane, size_t index) {
   size_t ref_lane = static_cast<uint32_t>(random >> 32) % threads;

   if(n == 0 && slice == 0) {
      ref_lane = lane;
   }

   size_t m = 3 * segments;
   size_t s = ((slice + 1) % 4) * segments;

   if(lane == ref_lane) {
      m += index;
   }

   if(n == 0) {
      m = slice * segments;
      s = 0;
      if(slice == 0 || lane == ref_lane) {
         m += index;
      }
   }

   if(index == 0 || lane == ref_lane) {
      m -= 1;
   }

   uint64_t p = static_cast<uint32_t>(random);
   p = (p * p) >> 32;
   p = (p * m) >> 32;

   return static_cast<uint32_t>(ref_lane * lanes + (s + m - (p + 1)) % lanes);
}

void process_block(secure_vector<uint64_t>& B,
                   size_t n,
                   size_t slice,
                   size_t lane,
                   size_t lanes,
                   size_t segments,
                   size_t threads,
                   uint8_t mode,
                   size_t memory,
                   size_t time) {
   uint64_t T[128];
   size_t index = 0;
   if(n == 0 && slice == 0) {
      index = 2;
   }

   const bool use_2i = mode == 1 || (mode == 2 && n == 0 && slice < SYNC_POINTS / 2);

   uint64_t addresses[128];
   size_t address_counter = 1;

   if(use_2i) {
      gen_2i_addresses(T, addresses, n, lane, slice, memory, time, mode, address_counter);
   }

   while(index < segments) {
      const size_t offset = lane * lanes + slice * segments + index;

      size_t prev = offset - 1;
      if(index == 0 && slice == 0) {
         prev += lanes;
      }

      if(use_2i && index > 0 && index % 128 == 0) {
         address_counter += 1;
         gen_2i_addresses(T, addresses, n, lane, slice, memory, time, mode, address_counter);
      }

      const uint64_t random = use_2i ? addresses[index % 128] : B.at(128 * prev);
      const size_t new_offset = index_alpha(random, lanes, segments, threads, n, slice, lane, index);

      uint64_t N[128];
      for(size_t i = 0; i != 128; ++i) {
         N[i] = B[128 * prev + i] ^ B[128 * new_offset + i];
      }

      Argon2::blamka(N, T);

      for(size_t i = 0; i != 128; ++i) {
         B[128 * offset + i] ^= N[i];
      }

      index += 1;
   }
}

void process_blocks(secure_vector<uint64_t>& B, size_t t, size_t memory, size_t threads, uint8_t mode) {
   const size_t lanes = memory / threads;
   const size_t segments = lanes / SYNC_POINTS;

#if defined(BOTAN_HAS_THREAD_UTILS)
   if(threads > 1) {
      auto& thread_pool = Thread_Pool::global_instance();

      for(size_t n = 0; n != t; ++n) {
         for(size_t slice = 0; slice != SYNC_POINTS; ++slice) {
            std::vector<std::future<void>> fut_results;
            fut_results.reserve(threads);

            for(size_t lane = 0; lane != threads; ++lane) {
               fut_results.push_back(thread_pool.run(
                  process_block, std::ref(B), n, slice, lane, lanes, segments, threads, mode, memory, t));
            }

            for(auto& fut : fut_results) {
               fut.get();
            }
         }
      }

      return;
   }
#endif

   for(size_t n = 0; n != t; ++n) {
      for(size_t slice = 0; slice != SYNC_POINTS; ++slice) {
         for(size_t lane = 0; lane != threads; ++lane) {
            process_block(B, n, slice, lane, lanes, segments, threads, mode, memory, t);
         }
      }
   }
}

}  // namespace

void Argon2::argon2(uint8_t output[],
                    size_t output_len,
                    const char* password,
                    size_t password_len,
                    const uint8_t salt[],
                    size_t salt_len,
                    const uint8_t key[],
                    size_t key_len,
                    const uint8_t ad[],
                    size_t ad_len) const {
   BOTAN_ARG_CHECK(output_len >= 4 && output_len <= std::numeric_limits<uint32_t>::max(),
                   "Invalid Argon2 output length");
   BOTAN_ARG_CHECK(password_len <= std::numeric_limits<uint32_t>::max(), "Invalid Argon2 password length");
   BOTAN_ARG_CHECK(salt_len <= std::numeric_limits<uint32_t>::max(), "Invalid Argon2 salt length");
   BOTAN_ARG_CHECK(key_len <= std::numeric_limits<uint32_t>::max(), "Invalid Argon2 key length");
   BOTAN_ARG_CHECK(ad_len <= std::numeric_limits<uint32_t>::max(), "Invalid Argon2 ad length");

   auto blake2 = HashFunction::create_or_throw("BLAKE2b");

   uint8_t H0[64] = {0};
   argon2_H0(H0,
             *blake2,
             output_len,
             password,
             password_len,
             salt,
             salt_len,
             key,
             key_len,
             ad,
             ad_len,
             m_family,
             m_p,
             m_M,
             m_t);

   const size_t memory = (m_M / (SYNC_POINTS * m_p)) * (SYNC_POINTS * m_p);

   secure_vector<uint64_t> B(memory * 1024 / 8);

   init_blocks(B, *blake2, H0, memory, m_p);
   process_blocks(B, m_t, memory, m_p, m_family);

   clear_mem(output, output_len);
   extract_key(output, output_len, B, memory, m_p);
}

}  // namespace Botan

Coverage Report

Created: 2024-11-29 06:10

Line	Count	Source (jump to first uncovered line)
1		/**
2		* (C) 2018,2019,2022 Jack Lloyd
3		*
4		* Botan is released under the Simplified BSD License (see license.txt)
5		*/
6
7		#include <botan/argon2.h>
8
9		#include <botan/exceptn.h>
10		#include <botan/hash.h>
11		#include <botan/mem_ops.h>
12		#include <botan/internal/fmt.h>
13		#include <botan/internal/loadstor.h>
14		#include <botan/internal/rotate.h>
15		#include <limits>
16
17		#if defined(BOTAN_HAS_THREAD_UTILS)
18		#include <botan/internal/thread_pool.h>
19		#endif
20
21		#if defined(BOTAN_HAS_ARGON2_AVX2) \|\| defined(BOTAN_HAS_ARGON2_SSSE3)
22		#include <botan/internal/cpuid.h>
23		#endif
24
25		namespace Botan {
26
27		namespace {
28
29		const size_t SYNC_POINTS = 4;
30
31		void argon2_H0(uint8_t H0[64],
32		HashFunction& blake2b,
33		size_t output_len,
34		const char* password,
35		size_t password_len,
36		const uint8_t salt[],
37		size_t salt_len,
38		const uint8_t key[],
39		size_t key_len,
40		const uint8_t ad[],
41		size_t ad_len,
42		size_t y,
43		size_t p,
44		size_t M,
45	0	size_t t) {
46	0	const uint8_t v = 19; // Argon2 version code
47
48	0	blake2b.update_le(static_cast<uint32_t>(p));
49	0	blake2b.update_le(static_cast<uint32_t>(output_len));
50	0	blake2b.update_le(static_cast<uint32_t>(M));
51	0	blake2b.update_le(static_cast<uint32_t>(t));
52	0	blake2b.update_le(static_cast<uint32_t>(v));
53	0	blake2b.update_le(static_cast<uint32_t>(y));
54
55	0	blake2b.update_le(static_cast<uint32_t>(password_len));
56	0	blake2b.update(cast_char_ptr_to_uint8(password), password_len);
57
58	0	blake2b.update_le(static_cast<uint32_t>(salt_len));
59	0	blake2b.update(salt, salt_len);
60
61	0	blake2b.update_le(static_cast<uint32_t>(key_len));
62	0	blake2b.update(key, key_len);
63
64	0	blake2b.update_le(static_cast<uint32_t>(ad_len));
65	0	blake2b.update(ad, ad_len);
66
67	0	blake2b.final(H0);
68	0	}
69
70	0	void extract_key(uint8_t output[], size_t output_len, const secure_vector<uint64_t>& B, size_t memory, size_t threads) {
71	0	const size_t lanes = memory / threads;
72
73	0	uint64_t sum[128] = {0};
74
75	0	for(size_t lane = 0; lane != threads; ++lane) {
76	0	const size_t start = 128 * (lane * lanes + lanes - 1);
77	0	const size_t end = 128 * (lane * lanes + lanes);
78
79	0	for(size_t j = start; j != end; ++j) {
80	0	sum[j % 128] ^= B[j];
81	0	}
82	0	}
83
84	0	if(output_len <= 64) {
85	0	auto blake2b = HashFunction::create_or_throw(fmt("BLAKE2b({})", output_len * 8));
86	0	blake2b->update_le(static_cast<uint32_t>(output_len));
87	0	for(size_t i = 0; i != 128; ++i) {
88	0	blake2b->update_le(sum[i]);
89	0	}
90	0	blake2b->final(output);
91	0	} else {
92	0	secure_vector<uint8_t> T(64);
93
94	0	auto blake2b = HashFunction::create_or_throw("BLAKE2b(512)");
95	0	blake2b->update_le(static_cast<uint32_t>(output_len));
96	0	for(size_t i = 0; i != 128; ++i) {
97	0	blake2b->update_le(sum[i]);
98	0	}
99	0	blake2b->final(&T[0]);
100
101	0	while(output_len > 64) {
102	0	copy_mem(output, &T[0], 32);
103	0	output_len -= 32;
104	0	output += 32;
105
106	0	if(output_len > 64) {
107	0	blake2b->update(T);
108	0	blake2b->final(&T[0]);
109	0	}
110	0	}
111
112	0	if(output_len == 64) {
113	0	blake2b->update(T);
114	0	blake2b->final(output);
115	0	} else {
116	0	auto blake2b_f = HashFunction::create_or_throw(fmt("BLAKE2b({})", output_len * 8));
117	0	blake2b_f->update(T);
118	0	blake2b_f->final(output);
119	0	}
120	0	}
121	0	}
122
123		void init_blocks(
124	0	secure_vector<uint64_t>& B, HashFunction& blake2b, const uint8_t H0[64], size_t memory, size_t threads) {
125	0	BOTAN_ASSERT_NOMSG(B.size() >= threads * 256);
126
127	0	for(size_t i = 0; i != threads; ++i) {
128	0	const size_t B_off = i * (memory / threads);
129
130	0	BOTAN_ASSERT_NOMSG(B.size() >= 128 * (B_off + 2));
131
132	0	for(size_t j = 0; j != 2; ++j) {
133	0	uint8_t T[64] = {0};
134
135	0	blake2b.update_le(static_cast<uint32_t>(1024));
136	0	blake2b.update(H0, 64);
137	0	blake2b.update_le(static_cast<uint32_t>(j));
138	0	blake2b.update_le(static_cast<uint32_t>(i));
139	0	blake2b.final(T);
140
141	0	for(size_t k = 0; k != 30; ++k) {
142	0	load_le(&B[128 * (B_off + j) + 4 * k], T, 32 / 8);
143	0	blake2b.update(T, 64);
144	0	blake2b.final(T);
145	0	}
146
147	0	load_le(&B[128 * (B_off + j) + 4 * 30], T, 64 / 8);
148	0	}
149	0	}
150	0	}
151
152	0	BOTAN_FORCE_INLINE void blamka_G(uint64_t& A, uint64_t& B, uint64_t& C, uint64_t& D) {
153	0	A += B + (static_cast<uint64_t>(2) * static_cast<uint32_t>(A)) * static_cast<uint32_t>(B);
154	0	D = rotr<32>(A ^ D);
155
156	0	C += D + (static_cast<uint64_t>(2) * static_cast<uint32_t>(C)) * static_cast<uint32_t>(D);
157	0	B = rotr<24>(B ^ C);
158
159	0	A += B + (static_cast<uint64_t>(2) * static_cast<uint32_t>(A)) * static_cast<uint32_t>(B);
160	0	D = rotr<16>(A ^ D);
161
162	0	C += D + (static_cast<uint64_t>(2) * static_cast<uint32_t>(C)) * static_cast<uint32_t>(D);
163	0	B = rotr<63>(B ^ C);
164	0	}
165
166		} // namespace
167
168	0	void Argon2::blamka(uint64_t N[128], uint64_t T[128]) {
169	0	#if defined(BOTAN_HAS_ARGON2_AVX2)
170	0	if(CPUID::has_avx2()) {
171	0	return Argon2::blamka_avx2(N, T);
172	0	}
173	0	#endif
174
175	0	#if defined(BOTAN_HAS_ARGON2_SSSE3)
176	0	if(CPUID::has_ssse3()) {
177	0	return Argon2::blamka_ssse3(N, T);
178	0	}
179	0	#endif
180
181	0	copy_mem(T, N, 128);
182
183	0	for(size_t i = 0; i != 128; i += 16) {
184	0	blamka_G(T[i + 0], T[i + 4], T[i + 8], T[i + 12]);
185	0	blamka_G(T[i + 1], T[i + 5], T[i + 9], T[i + 13]);
186	0	blamka_G(T[i + 2], T[i + 6], T[i + 10], T[i + 14]);
187	0	blamka_G(T[i + 3], T[i + 7], T[i + 11], T[i + 15]);
188
189	0	blamka_G(T[i + 0], T[i + 5], T[i + 10], T[i + 15]);
190	0	blamka_G(T[i + 1], T[i + 6], T[i + 11], T[i + 12]);
191	0	blamka_G(T[i + 2], T[i + 7], T[i + 8], T[i + 13]);
192	0	blamka_G(T[i + 3], T[i + 4], T[i + 9], T[i + 14]);
193	0	}
194
195	0	for(size_t i = 0; i != 128 / 8; i += 2) {
196	0	blamka_G(T[i + 0], T[i + 32], T[i + 64], T[i + 96]);
197	0	blamka_G(T[i + 1], T[i + 33], T[i + 65], T[i + 97]);
198	0	blamka_G(T[i + 16], T[i + 48], T[i + 80], T[i + 112]);
199	0	blamka_G(T[i + 17], T[i + 49], T[i + 81], T[i + 113]);
200
201	0	blamka_G(T[i + 0], T[i + 33], T[i + 80], T[i + 113]);
202	0	blamka_G(T[i + 1], T[i + 48], T[i + 81], T[i + 96]);
203	0	blamka_G(T[i + 16], T[i + 49], T[i + 64], T[i + 97]);
204	0	blamka_G(T[i + 17], T[i + 32], T[i + 65], T[i + 112]);
205	0	}
206
207	0	for(size_t i = 0; i != 128; ++i) {
208	0	N[i] ^= T[i];
209	0	}
210	0	}
211
212		namespace {
213
214		void gen_2i_addresses(uint64_t T[128],
215		uint64_t B[128],
216		size_t n,
217		size_t lane,
218		size_t slice,
219		size_t memory,
220		size_t time,
221		size_t mode,
222	0	size_t cnt) {
223	0	clear_mem(B, 128);
224
225	0	B[0] = n;
226	0	B[1] = lane;
227	0	B[2] = slice;
228	0	B[3] = memory;
229	0	B[4] = time;
230	0	B[5] = mode;
231	0	B[6] = cnt;
232
233	0	for(size_t r = 0; r != 2; ++r) {
234	0	Argon2::blamka(B, T);
235	0	}
236	0	}
237
238		uint32_t index_alpha(
239	0	uint64_t random, size_t lanes, size_t segments, size_t threads, size_t n, size_t slice, size_t lane, size_t index) {
240	0	size_t ref_lane = static_cast<uint32_t>(random >> 32) % threads;
241
242	0	if(n == 0 && slice == 0) {
243	0	ref_lane = lane;
244	0	}
245
246	0	size_t m = 3 * segments;
247	0	size_t s = ((slice + 1) % 4) * segments;
248
249	0	if(lane == ref_lane) {
250	0	m += index;
251	0	}
252
253	0	if(n == 0) {
254	0	m = slice * segments;
255	0	s = 0;
256	0	if(slice == 0 \|\| lane == ref_lane) {
257	0	m += index;
258	0	}
259	0	}
260
261	0	if(index == 0 \|\| lane == ref_lane) {
262	0	m -= 1;
263	0	}
264
265	0	uint64_t p = static_cast<uint32_t>(random);
266	0	p = (p * p) >> 32;
267	0	p = (p * m) >> 32;
268
269	0	return static_cast<uint32_t>(ref_lane * lanes + (s + m - (p + 1)) % lanes);
270	0	}
271
272		void process_block(secure_vector<uint64_t>& B,
273		size_t n,
274		size_t slice,
275		size_t lane,
276		size_t lanes,
277		size_t segments,
278		size_t threads,
279		uint8_t mode,
280		size_t memory,
281	0	size_t time) {
282	0	uint64_t T[128];
283	0	size_t index = 0;
284	0	if(n == 0 && slice == 0) {
285	0	index = 2;
286	0	}
287
288	0	const bool use_2i = mode == 1 \|\| (mode == 2 && n == 0 && slice < SYNC_POINTS / 2);
289
290	0	uint64_t addresses[128];
291	0	size_t address_counter = 1;
292
293	0	if(use_2i) {
294	0	gen_2i_addresses(T, addresses, n, lane, slice, memory, time, mode, address_counter);
295	0	}
296
297	0	while(index < segments) {
298	0	const size_t offset = lane * lanes + slice * segments + index;
299
300	0	size_t prev = offset - 1;
301	0	if(index == 0 && slice == 0) {
302	0	prev += lanes;
303	0	}
304
305	0	if(use_2i && index > 0 && index % 128 == 0) {
306	0	address_counter += 1;
307	0	gen_2i_addresses(T, addresses, n, lane, slice, memory, time, mode, address_counter);
308	0	}
309
310	0	const uint64_t random = use_2i ? addresses[index % 128] : B.at(128 * prev);
311	0	const size_t new_offset = index_alpha(random, lanes, segments, threads, n, slice, lane, index);
312
313	0	uint64_t N[128];
314	0	for(size_t i = 0; i != 128; ++i) {
315	0	N[i] = B[128 * prev + i] ^ B[128 * new_offset + i];
316	0	}
317
318	0	Argon2::blamka(N, T);
319
320	0	for(size_t i = 0; i != 128; ++i) {
321	0	B[128 * offset + i] ^= N[i];
322	0	}
323
324	0	index += 1;
325	0	}
326	0	}
327
328	0	void process_blocks(secure_vector<uint64_t>& B, size_t t, size_t memory, size_t threads, uint8_t mode) {
329	0	const size_t lanes = memory / threads;
330	0	const size_t segments = lanes / SYNC_POINTS;
331
332	0	#if defined(BOTAN_HAS_THREAD_UTILS)
333	0	if(threads > 1) {
334	0	auto& thread_pool = Thread_Pool::global_instance();
335
336	0	for(size_t n = 0; n != t; ++n) {
337	0	for(size_t slice = 0; slice != SYNC_POINTS; ++slice) {
338	0	std::vector<std::future<void>> fut_results;
339	0	fut_results.reserve(threads);
340
341	0	for(size_t lane = 0; lane != threads; ++lane) {
342	0	fut_results.push_back(thread_pool.run(
343	0	process_block, std::ref(B), n, slice, lane, lanes, segments, threads, mode, memory, t));
344	0	}
345
346	0	for(auto& fut : fut_results) {
347	0	fut.get();
348	0	}
349	0	}
350	0	}
351
352	0	return;
353	0	}
354	0	#endif
355
356	0	for(size_t n = 0; n != t; ++n) {
357	0	for(size_t slice = 0; slice != SYNC_POINTS; ++slice) {
358	0	for(size_t lane = 0; lane != threads; ++lane) {
359	0	process_block(B, n, slice, lane, lanes, segments, threads, mode, memory, t);
360	0	}
361	0	}
362	0	}
363	0	}
364
365		} // namespace
366
367		void Argon2::argon2(uint8_t output[],
368		size_t output_len,
369		const char* password,
370		size_t password_len,
371		const uint8_t salt[],
372		size_t salt_len,
373		const uint8_t key[],
374		size_t key_len,
375		const uint8_t ad[],
376	0	size_t ad_len) const {
377	0	BOTAN_ARG_CHECK(output_len >= 4 && output_len <= std::numeric_limits<uint32_t>::max(),
378	0	"Invalid Argon2 output length");
379	0	BOTAN_ARG_CHECK(password_len <= std::numeric_limits<uint32_t>::max(), "Invalid Argon2 password length");
380	0	BOTAN_ARG_CHECK(salt_len <= std::numeric_limits<uint32_t>::max(), "Invalid Argon2 salt length");
381	0	BOTAN_ARG_CHECK(key_len <= std::numeric_limits<uint32_t>::max(), "Invalid Argon2 key length");
382	0	BOTAN_ARG_CHECK(ad_len <= std::numeric_limits<uint32_t>::max(), "Invalid Argon2 ad length");
383
384	0	auto blake2 = HashFunction::create_or_throw("BLAKE2b");
385
386	0	uint8_t H0[64] = {0};
387	0	argon2_H0(H0,
388	0	*blake2,
389	0	output_len,
390	0	password,
391	0	password_len,
392	0	salt,
393	0	salt_len,
394	0	key,
395	0	key_len,
396	0	ad,
397	0	ad_len,
398	0	m_family,
399	0	m_p,
400	0	m_M,
401	0	m_t);
402
403	0	const size_t memory = (m_M / (SYNC_POINTS * m_p)) * (SYNC_POINTS * m_p);
404
405	0	secure_vector<uint64_t> B(memory * 1024 / 8);
406
407	0	init_blocks(B, *blake2, H0, memory, m_p);
408	0	process_blocks(B, m_t, memory, m_p, m_family);
409
410	0	clear_mem(output, output_len);
411	0	extract_key(output, output_len, B, memory, m_p);
412	0	}
413
414		} // namespace Botan