Botan  2.6.0
Crypto and TLS for C++11
kdf2.cpp
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1 /*
2 * KDF2
3 * (C) 1999-2007 Jack Lloyd
4 *
5 * Botan is released under the Simplified BSD License (see license.txt)
6 */
7 
8 #include <botan/kdf2.h>
9 
10 namespace Botan {
11 
12 size_t KDF2::kdf(uint8_t key[], size_t key_len,
13  const uint8_t secret[], size_t secret_len,
14  const uint8_t salt[], size_t salt_len,
15  const uint8_t label[], size_t label_len) const
16  {
17  uint32_t counter = 1;
19 
20  size_t offset = 0;
21  while(offset != key_len && counter != 0)
22  {
23  m_hash->update(secret, secret_len);
24  m_hash->update_be(counter++);
25  m_hash->update(label, label_len);
26  m_hash->update(salt, salt_len);
27  m_hash->final(h);
28 
29  const size_t added = std::min(h.size(), key_len - offset);
30  copy_mem(&key[offset], h.data(), added);
31  offset += added;
32  }
33 
34  return offset;
35  }
36 
37 }
size_t salt_len
Definition: x509_obj.cpp:26
void copy_mem(T *out, const T *in, size_t n)
Definition: mem_ops.h:108
Definition: alg_id.cpp:13
size_t kdf(uint8_t key[], size_t key_len, const uint8_t secret[], size_t secret_len, const uint8_t salt[], size_t salt_len, const uint8_t label[], size_t label_len) const override
Definition: kdf2.cpp:12
std::vector< T, secure_allocator< T > > secure_vector
Definition: secmem.h:88