1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
|
/*
* HKDF
* (C) 2013,2015 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/hkdf.h>
namespace Botan {
size_t HKDF::kdf(byte out[], size_t out_len,
const byte secret[], size_t secret_len,
const byte salt[], size_t salt_len,
const byte label[], size_t label_len) const
{
m_prf->set_key(secret, secret_len);
byte counter = 1;
secure_vector<byte> h;
size_t offset = 0;
while(offset != out_len && counter != 0)
{
m_prf->update(h);
m_prf->update(label, label_len);
m_prf->update(salt, salt_len);
m_prf->update(counter++);
m_prf->final(h);
const size_t written = std::min(h.size(), out_len - offset);
copy_mem(&out[offset], h.data(), written);
offset += written;
}
return offset;
}
}
|
