Botan 2.19.3
Crypto and TLS for C&
kdf1_iso18033.cpp
Go to the documentation of this file.
1/*
2* KDF1 from ISO 18033-2
3* (C) 2016 Philipp Weber
4*
5* Botan is released under the Simplified BSD License (see license.txt)
6*/
7
8#include <botan/kdf1_iso18033.h>
9
10namespace Botan {
11
12size_t KDF1_18033::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 = 0;
19
20 size_t offset = 0;
21 while(offset != key_len && counter != 0xFFFFFFFF)
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 // FIXME: returns truncated output
35 return offset;
36 }
37
38}
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
void copy_mem(T *out, const T *in, size_t n)
Definition mem_ops.h:133
std::vector< T, secure_allocator< T > > secure_vector
Definition secmem.h:65
size_t salt_len
Definition x509_obj.cpp:25