blob: 734dc36988400883722b7eb0a96fa2b3db9e96c2 (
plain)
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
|
/*
* EMSA-Raw
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/emsa_raw.h>
namespace Botan {
/*
* EMSA-Raw Encode Operation
*/
void EMSA_Raw::update(const byte input[], u32bit length)
{
message.append(input, length);
}
/*
* Return the raw (unencoded) data
*/
SecureVector<byte> EMSA_Raw::raw_data()
{
SecureVector<byte> buf = message;
message.destroy();
return buf;
}
/*
* EMSA-Raw Encode Operation
*/
SecureVector<byte> EMSA_Raw::encoding_of(const MemoryRegion<byte>& msg,
u32bit,
RandomNumberGenerator&)
{
return msg;
}
/*
* EMSA-Raw Verify Operation
*/
bool EMSA_Raw::verify(const MemoryRegion<byte>& coded,
const MemoryRegion<byte>& raw,
u32bit)
{
if(coded.size() == raw.size())
return (coded == raw);
if(coded.size() > raw.size())
return false;
// handle zero padding differences
const u32bit leading_zeros_expected = raw.size() - coded.size();
bool same_modulo_leading_zeros = true;
for(u32bit i = 0; i != leading_zeros_expected; ++i)
if(raw[i])
same_modulo_leading_zeros = false;
if(!same_mem(&coded[0], &raw[leading_zeros_expected], coded.size()))
same_modulo_leading_zeros = false;
return same_modulo_leading_zeros;
}
}
|
