Botan  2.18.1
Crypto and TLS for C++11
mdx_hash.h
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1 /*
2 * MDx Hash Function
3 * (C) 1999-2008 Jack Lloyd
4 *
5 * Botan is released under the Simplified BSD License (see license.txt)
6 */
7 
8 #ifndef BOTAN_MDX_BASE_H_
9 #define BOTAN_MDX_BASE_H_
10 
11 #include <botan/hash.h>
12 
14 
15 namespace Botan {
16 
17 /**
18 * MDx Hash Function Base Class
19 */
21  {
22  public:
23  /**
24  * @param block_length is the number of bytes per block, which must
25  * be a power of 2 and at least 8.
26  * @param big_byte_endian specifies if the hash uses big-endian bytes
27  * @param big_bit_endian specifies if the hash uses big-endian bits
28  * @param counter_size specifies the size of the counter var in bytes
29  */
30  MDx_HashFunction(size_t block_length,
31  bool big_byte_endian,
32  bool big_bit_endian,
33  uint8_t counter_size = 8);
34 
35  size_t hash_block_size() const override final { return m_buffer.size(); }
36  protected:
37  void add_data(const uint8_t input[], size_t length) override final;
38  void final_result(uint8_t output[]) override final;
39 
40  /**
41  * Run the hash's compression function over a set of blocks
42  * @param blocks the input
43  * @param block_n the number of blocks
44  */
45  virtual void compress_n(const uint8_t blocks[], size_t block_n) = 0;
46 
47  void clear() override;
48 
49  /**
50  * Copy the output to the buffer
51  * @param buffer to put the output into
52  */
53  virtual void copy_out(uint8_t buffer[]) = 0;
54 
55  /**
56  * Write the count, if used, to this spot
57  * @param out where to write the counter to
58  */
59  virtual void write_count(uint8_t out[]);
60  private:
61  const uint8_t m_pad_char;
62  const uint8_t m_counter_size;
63  const uint8_t m_block_bits;
64  const bool m_count_big_endian;
65 
66  uint64_t m_count;
67  secure_vector<uint8_t> m_buffer;
68  size_t m_position;
69  };
70 
71 }
72 
73 #endif
int(* final)(unsigned char *, CTX *)
#define BOTAN_PUBLIC_API(maj, min)
Definition: compiler.h:31
size_t hash_block_size() const override final
Definition: mdx_hash.h:35
Definition: alg_id.cpp:13
virtual void clear()=0
std::vector< T, secure_allocator< T > > secure_vector
Definition: secmem.h:65
#define BOTAN_FUTURE_INTERNAL_HEADER(hdr)
Definition: compiler.h:136