blob: 53f3ff3d0a05368ee9f4e33124e88671e9ebe9c4 (
plain) (
blame)
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
|
// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <cstdint>
#include <cstring>
namespace vespalib {
/**
* SHA-1 in C
* By Steve Reid <steve@edmweb.com>
* 100% Public Domain
*
* To generate a digest for a message contained
* in memory, simply use the static hash function. For incremental
* digest generation, you need an instance of this class. If the
* object has been used before, invoke reset to begin generating a new
* digest. Then invoke process multiple times to process the
* input. After all input has been given to the process function, use
* the get_digest function to calculate the final digest.
**/
class Sha1
{
private:
uint32_t _state[5];
uint32_t _count[2];
uint8_t _buffer[64];
/**
* Use the 64 bytes (512 bits) stored in _buffer to update
* _state. This operation will garble the contents of buffer.
**/
void transform();
public:
Sha1();
/**
* Start generating a new digest.
**/
void reset();
/**
* Process input data.
*
* @param data input data
* @param len input data len
**/
void process(const char *data, size_t len);
/**
* Calculate final digest. By adjusting the digestLen parameter
* this function may be instructed to only return a prefix of the
* SHA-1 digest.
*
* @param digest where to put the digest
* @param digestLen how much digest we want (max 20)
**/
void get_digest(char *digest, size_t digestLen = 20);
/**
* Calculate the SHA-1 digest prefix based on the given input buffer.
*
* @param buf input buffer
* @param bufLen length of input buffer in bytes
* @param digest where to put the digest prefix
* @param digestLen the length of the wanted digest prefix (max 20)
**/
static void hash(const char *buf, size_t bufLen,
char *digest, size_t digestLen);
};
} // namespace vespalib
|
