Botan 2.19.3
Crypto and TLS for C&
shake.h
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1/*
2* SHAKE hash functions
3* (C) 2010,2016 Jack Lloyd
4*
5* Botan is released under the Simplified BSD License (see license.txt)
6*/
7
8#ifndef BOTAN_SHAKE_HASH_H_
9#define BOTAN_SHAKE_HASH_H_
10
11#include <botan/hash.h>
12#include <botan/secmem.h>
13#include <string>
14
16
17namespace Botan {
18
19/**
20* SHAKE-128
21*/
23 {
24 public:
25
26 /**
27 * @param output_bits the desired output size in bits
28 * must be a multiple of 8
29 */
30 explicit SHAKE_128(size_t output_bits);
31
32 size_t hash_block_size() const override { return SHAKE_128_BITRATE / 8; }
33 size_t output_length() const override { return m_output_bits / 8; }
34
35 HashFunction* clone() const override;
36 std::unique_ptr<HashFunction> copy_state() const override;
37 std::string name() const override;
38 void clear() override;
39
40 private:
41 void add_data(const uint8_t input[], size_t length) override;
42 void final_result(uint8_t out[]) override;
43
44 static const size_t SHAKE_128_BITRATE = 1600 - 256;
45
46 size_t m_output_bits;
48 size_t m_S_pos;
49 };
50
51/**
52* SHAKE-256
53*/
55 {
56 public:
57
58 /**
59 * @param output_bits the desired output size in bits
60 * must be a multiple of 8
61 */
62 explicit SHAKE_256(size_t output_bits);
63
64 size_t hash_block_size() const override { return SHAKE_256_BITRATE / 8; }
65 size_t output_length() const override { return m_output_bits / 8; }
66
67 HashFunction* clone() const override;
68 std::unique_ptr<HashFunction> copy_state() const override;
69 std::string name() const override;
70 void clear() override;
71
72 private:
73 void add_data(const uint8_t input[], size_t length) override;
74 void final_result(uint8_t out[]) override;
75
76 static const size_t SHAKE_256_BITRATE = 1600 - 512;
77
78 size_t m_output_bits;
80 size_t m_S_pos;
81 };
82
83}
84
85#endif
virtual HashFunction * clone() const =0
virtual std::unique_ptr< HashFunction > copy_state() const =0
virtual std::string name() const =0
virtual void clear()=0
size_t hash_block_size() const override
Definition shake.h:32
size_t output_length() const override
Definition shake.h:33
size_t output_length() const override
Definition shake.h:65
size_t hash_block_size() const override
Definition shake.h:64
int(* final)(unsigned char *, CTX *)
#define BOTAN_PUBLIC_API(maj, min)
Definition compiler.h:31
#define BOTAN_FUTURE_INTERNAL_HEADER(hdr)
Definition compiler.h:136
std::vector< T, secure_allocator< T > > secure_vector
Definition secmem.h:65