Botan 2.1.0 Crypto and TLS for C++11

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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
15 namespace Botan {
16
17 /**
18 * SHAKE-128
19 */
20 class BOTAN_DLL SHAKE_128 : public HashFunction
21 {
22 public:
23
24 /**
25 * @param output_bits the desired output size in bits
26 * must be a multiple of 8
27 */
28 SHAKE_128(size_t output_bits);
29
30 size_t hash_block_size() const override { return SHAKE_128_BITRATE / 8; }
31 size_t output_length() const override { return m_output_bits / 8; }
32
33 HashFunction* clone() const override;
34 std::string name() const override;
35 void clear() override;
36
37 private:
38 void add_data(const uint8_t input[], size_t length) override;
39 void final_result(uint8_t out[]) override;
40
41 static const size_t SHAKE_128_BITRATE = 1600 - 256;
42
43 size_t m_output_bits;
44 secure_vector<uint64_t> m_S;
45 size_t m_S_pos;
46 };
47
48 /**
49 * SHAKE-256
50 */
51 class BOTAN_DLL SHAKE_256 : public HashFunction
52 {
53 public:
54
55 /**
56 * @param output_bits the desired output size in bits
57 * must be a multiple of 8
58 */
59 SHAKE_256(size_t output_bits);
60
61 size_t hash_block_size() const override { return SHAKE_256_BITRATE / 8; }
62 size_t output_length() const override { return m_output_bits / 8; }
63
64 HashFunction* clone() const override;
65 std::string name() const override;
66 void clear() override;
67
68 private:
69 void add_data(const uint8_t input[], size_t length) override;
70 void final_result(uint8_t out[]) override;
71
72 static const size_t SHAKE_256_BITRATE = 1600 - 512;
73
74 size_t m_output_bits;
75 secure_vector<uint64_t> m_S;
76 size_t m_S_pos;
77 };
78
79 }
80
81 #endif
Botan::SHAKE_256::hash_block_size
size_t hash_block_size() const override
Definition: shake.h:61
Botan::SHAKE_128
Definition: shake.h:20
Botan::secure_vector
std::vector< T, secure_allocator< T >> secure_vector
Definition: secmem.h:121
Botan::SHAKE_128::output_length
size_t output_length() const override
Definition: shake.h:31
Botan::SHAKE_128::hash_block_size
size_t hash_block_size() const override
Definition: shake.h:30
Botan
Definition: alg_id.cpp:13
Botan::SHAKE_256::output_length
size_t output_length() const override
Definition: shake.h:62
Botan::HashFunction
Definition: hash.h:19
Botan::SHAKE_256
Definition: shake.h:51