/src/botan/build/include/botan/internal/sp800_56c.h
Line | Count | Source (jump to first uncovered line) |
1 | | /* |
2 | | * KDF defined in NIST SP 800-56c |
3 | | * (C) 2016 Kai Michaelis |
4 | | * |
5 | | * Botan is released under the Simplified BSD License (see license.txt) |
6 | | */ |
7 | | |
8 | | #ifndef BOTAN_SP800_56C_H_ |
9 | | #define BOTAN_SP800_56C_H_ |
10 | | |
11 | | #include <botan/kdf.h> |
12 | | #include <botan/mac.h> |
13 | | |
14 | | namespace Botan { |
15 | | |
16 | | /** |
17 | | * NIST SP 800-56C KDF |
18 | | */ |
19 | | class SP800_56C final : public KDF |
20 | | { |
21 | | public: |
22 | 0 | std::string name() const override { return "SP800-56C(" + m_prf->name() + ")"; } |
23 | | |
24 | 0 | std::unique_ptr<KDF> new_object() const override { return std::make_unique<SP800_56C>(m_prf->new_object(), m_exp->new_object()); } |
25 | | |
26 | | /** |
27 | | * Derive a key using the SP800-56C KDF. |
28 | | * |
29 | | * The implementation hard codes the context value for the |
30 | | * expansion step to the empty string. |
31 | | * |
32 | | * @param key derived keying material K_M |
33 | | * @param key_len the desired output length in bytes |
34 | | * @param secret shared secret Z |
35 | | * @param secret_len size of Z in bytes |
36 | | * @param salt salt s of the extraction step |
37 | | * @param salt_len size of s in bytes |
38 | | * @param label label for the expansion step |
39 | | * @param label_len size of label in bytes |
40 | | */ |
41 | | void kdf(uint8_t key[], size_t key_len, |
42 | | const uint8_t secret[], size_t secret_len, |
43 | | const uint8_t salt[], size_t salt_len, |
44 | | const uint8_t label[], size_t label_len) const override; |
45 | | |
46 | | /** |
47 | | * @param mac MAC algorithm used for randomness extraction |
48 | | * @param exp KDF used for key expansion |
49 | | */ |
50 | | SP800_56C(std::unique_ptr<MessageAuthenticationCode> mac, |
51 | | std::unique_ptr<KDF> exp) : |
52 | | m_prf(std::move(mac)), |
53 | | m_exp(std::move(exp)) |
54 | 0 | {} |
55 | | private: |
56 | | std::unique_ptr<MessageAuthenticationCode> m_prf; |
57 | | std::unique_ptr<KDF> m_exp; |
58 | | }; |
59 | | } |
60 | | |
61 | | #endif |