Botan  2.1.0
Crypto and TLS for C++11
skein_512.h
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1 /*
2 * The Skein-512 hash function
3 * (C) 2009,2014 Jack Lloyd
4 *
5 * Botan is released under the Simplified BSD License (see license.txt)
6 */
7 
8 #ifndef BOTAN_SKEIN_512_H__
9 #define BOTAN_SKEIN_512_H__
10 
11 #include <botan/hash.h>
12 #include <botan/threefish.h>
13 #include <string>
14 #include <memory>
15 
16 namespace Botan {
17 
18 /**
19 * Skein-512, a SHA-3 candidate
20 */
21 class BOTAN_DLL Skein_512 final : public HashFunction
22  {
23  public:
24  /**
25  * @param output_bits the output size of Skein in bits
26  * @param personalization is a string that will parameterize the
27  * hash output
28  */
29  Skein_512(size_t output_bits = 512,
30  const std::string& personalization = "");
31 
32  size_t hash_block_size() const override { return 64; }
33  size_t output_length() const override { return m_output_bits / 8; }
34 
35  HashFunction* clone() const override;
36  std::string name() const override;
37  void clear() override;
38  private:
39  enum type_code {
40  SKEIN_KEY = 0,
41  SKEIN_CONFIG = 4,
42  SKEIN_PERSONALIZATION = 8,
43  SKEIN_PUBLIC_KEY = 12,
44  SKEIN_KEY_IDENTIFIER = 16,
45  SKEIN_NONCE = 20,
46  SKEIN_MSG = 48,
47  SKEIN_OUTPUT = 63
48  };
49 
50  void add_data(const uint8_t input[], size_t length) override;
51  void final_result(uint8_t out[]) override;
52 
53  void ubi_512(const uint8_t msg[], size_t msg_len);
54 
55  void initial_block();
56  void reset_tweak(type_code type, bool is_final);
57 
58  std::string m_personalization;
59  size_t m_output_bits;
60 
61  std::unique_ptr<Threefish_512> m_threefish;
62  secure_vector<uint64_t> m_T;
63  secure_vector<uint8_t> m_buffer;
64  size_t m_buf_pos;
65  };
66 
67 }
68 
69 #endif
size_t hash_block_size() const override
Definition: skein_512.h:32
MechanismType type
Definition: alg_id.cpp:13
size_t output_length() const override
Definition: skein_512.h:33