Botan  2.19.1
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_512.h>
13 #include <string>
14 #include <memory>
15 
17 
18 namespace Botan {
19 
20 /**
21 * Skein-512, a SHA-3 candidate
22 */
24  {
25  public:
26  /**
27  * @param output_bits the output size of Skein in bits
28  * @param personalization is a string that will parameterize the
29  * hash output
30  */
31  Skein_512(size_t output_bits = 512,
32  const std::string& personalization = "");
33 
34  size_t hash_block_size() const override { return 64; }
35  size_t output_length() const override { return m_output_bits / 8; }
36 
37  HashFunction* clone() const override;
38  std::unique_ptr<HashFunction> copy_state() const override;
39  std::string name() const override;
40  void clear() override;
41  private:
42  enum type_code {
43  SKEIN_KEY = 0,
44  SKEIN_CONFIG = 4,
45  SKEIN_PERSONALIZATION = 8,
46  SKEIN_PUBLIC_KEY = 12,
47  SKEIN_KEY_IDENTIFIER = 16,
48  SKEIN_NONCE = 20,
49  SKEIN_MSG = 48,
50  SKEIN_OUTPUT = 63
51  };
52 
53  void add_data(const uint8_t input[], size_t length) override;
54  void final_result(uint8_t out[]) override;
55 
56  void ubi_512(const uint8_t msg[], size_t msg_len);
57 
58  void initial_block();
59  void reset_tweak(type_code type, bool is_final);
60 
61  std::string m_personalization;
62  size_t m_output_bits;
63 
64  std::unique_ptr<Threefish_512> m_threefish;
65  secure_vector<uint64_t> m_T;
66  secure_vector<uint8_t> m_buffer;
67  size_t m_buf_pos;
68  };
69 
70 }
71 
72 #endif
int(* final)(unsigned char *, CTX *)
#define BOTAN_PUBLIC_API(maj, min)
Definition: compiler.h:31
size_t hash_block_size() const override
Definition: skein_512.h:34
virtual std::string name() const =0
MechanismType type
virtual HashFunction * clone() const =0
Definition: alg_id.cpp:13
virtual void clear()=0
virtual std::unique_ptr< HashFunction > copy_state() const =0
size_t output_length() const override
Definition: skein_512.h:35
#define BOTAN_FUTURE_INTERNAL_HEADER(hdr)
Definition: compiler.h:136