1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
|
// Copyright (c) 2020-2024, The Monero Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#pragma once
#include <vector>
#include <gcrypt.h>
#include <span.h>
namespace openpgp
{
class hash
{
public:
enum algorithm : uint8_t
{
sha256 = 8,
};
hash(const hash &) = delete;
hash &operator=(const hash &) = delete;
hash(uint8_t algorithm)
: algo(algorithm)
, consumed(0)
{
if (gcry_md_open(&md, algo, 0) != GPG_ERR_NO_ERROR)
{
throw std::runtime_error("failed to create message digest object");
}
}
~hash()
{
gcry_md_close(md);
}
hash &operator<<(uint8_t byte)
{
gcry_md_putc(md, byte);
++consumed;
return *this;
}
hash &operator<<(const epee::span<const uint8_t> &bytes)
{
gcry_md_write(md, &bytes[0], bytes.size());
consumed += bytes.size();
return *this;
}
hash &operator<<(const std::vector<uint8_t> &bytes)
{
return *this << epee::to_span(bytes);
}
std::vector<uint8_t> finish() const
{
std::vector<uint8_t> result(gcry_md_get_algo_dlen(algo));
const void *digest = gcry_md_read(md, algo);
if (digest == nullptr)
{
throw std::runtime_error("failed to read the digest");
}
memcpy(&result[0], digest, result.size());
return result;
}
size_t consumed_bytes() const
{
return consumed;
}
private:
const uint8_t algo;
gcry_md_hd_t md;
size_t consumed;
};
}
|
