Botan  2.16.0
Crypto and TLS for C++11
sp800_56c.h
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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 
15 
16 namespace Botan {
17 
18 /**
19  * NIST SP 800-56C KDF
20  */
21 class BOTAN_PUBLIC_API(2,0) SP800_56C final : public KDF
22  {
23  public:
24  std::string name() const override { return "SP800-56C(" + m_prf->name() + ")"; }
25 
26  KDF* clone() const override { return new SP800_56C(m_prf->clone(), m_exp->clone()); }
27 
28  /**
29  * Derive a key using the SP800-56C KDF.
30  *
31  * The implementation hard codes the context value for the
32  * expansion step to the empty string.
33  *
34  * @param key derived keying material K_M
35  * @param key_len the desired output length in bytes
36  * @param secret shared secret Z
37  * @param secret_len size of Z in bytes
38  * @param salt salt s of the extraction step
39  * @param salt_len size of s in bytes
40  * @param label label for the expansion step
41  * @param label_len size of label in bytes
42  *
43  * @throws Invalid_Argument key_len > 2^32
44  */
45  size_t kdf(uint8_t key[], size_t key_len,
46  const uint8_t secret[], size_t secret_len,
47  const uint8_t salt[], size_t salt_len,
48  const uint8_t label[], size_t label_len) const override;
49 
50  /**
51  * @param mac MAC algorithm used for randomness extraction
52  * @param exp KDF used for key expansion
53  */
54  SP800_56C(MessageAuthenticationCode* mac, KDF* exp) : m_prf(mac), m_exp(exp) {}
55  private:
56  std::unique_ptr<MessageAuthenticationCode> m_prf;
57  std::unique_ptr<KDF> m_exp;
58  };
59 }
60 
61 #endif
int(* final)(unsigned char *, CTX *)
#define BOTAN_PUBLIC_API(maj, min)
Definition: compiler.h:31
KDF * clone() const override
Definition: sp800_56c.h:26
SP800_56C(MessageAuthenticationCode *mac, KDF *exp)
Definition: sp800_56c.h:54
size_t salt_len
Definition: x509_obj.cpp:25
Definition: alg_id.cpp:13
Definition: kdf.h:20
virtual 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 =0
std::string name() const override
Definition: sp800_56c.h:24
#define BOTAN_FUTURE_INTERNAL_HEADER(hdr)
Definition: compiler.h:145