Botan  2.1.0
Crypto and TLS for C++11
hmac.h
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1 /*
2 * HMAC
3 * (C) 1999-2007,2014 Jack Lloyd
4 *
5 * Botan is released under the Simplified BSD License (see license.txt)
6 */
7 
8 #ifndef BOTAN_HMAC_H__
9 #define BOTAN_HMAC_H__
10 
11 #include <botan/mac.h>
12 #include <botan/hash.h>
13 
14 namespace Botan {
15 
16 /**
17 * HMAC
18 */
19 class BOTAN_DLL HMAC final : public MessageAuthenticationCode
20  {
21  public:
22  void clear() override;
23  std::string name() const override;
24  MessageAuthenticationCode* clone() const override;
25 
26  size_t output_length() const override { return m_hash->output_length(); }
27 
29  {
30  // Absurd max length here is to support PBKDF2
31  return Key_Length_Specification(0, 512);
32  }
33 
34  /**
35  * @param hash the hash to use for HMACing
36  */
37  explicit HMAC(HashFunction* hash);
38 
39  HMAC(const HMAC&) = delete;
40  HMAC& operator=(const HMAC&) = delete;
41  private:
42  void add_data(const uint8_t[], size_t) override;
43  void final_result(uint8_t[]) override;
44  void key_schedule(const uint8_t[], size_t) override;
45 
46  std::unique_ptr<HashFunction> m_hash;
47  secure_vector<uint8_t> m_ikey, m_okey;
48  };
49 
50 }
51 
52 #endif
Key_Length_Specification key_spec() const override
Definition: hmac.h:28
size_t output_length() const override
Definition: hmac.h:26
std::vector< T, secure_allocator< T >> secure_vector
Definition: secmem.h:121
Definition: alg_id.cpp:13
std::unique_ptr< HashFunction > m_hash
Definition: tpm.cpp:439
MechanismType hash