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
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
/*************************************************
* Nyberg-Rueppel Source File *
* (C) 1999-2007 Jack Lloyd *
*************************************************/
#include <botan/nr.h>
#include <botan/numthry.h>
#include <botan/keypair.h>
#include <botan/libstate.h>
namespace Botan {
/*************************************************
* NR_PublicKey Constructor *
*************************************************/
NR_PublicKey::NR_PublicKey(const DL_Group& grp, const BigInt& y1)
{
group = grp;
y = y1;
X509_load_hook();
}
/*************************************************
* Algorithm Specific X.509 Initialization Code *
*************************************************/
void NR_PublicKey::X509_load_hook()
{
core = NR_Core(group, y);
load_check(global_state().prng_reference());
}
/*************************************************
* Nyberg-Rueppel Verification Function *
*************************************************/
SecureVector<byte> NR_PublicKey::verify(const byte sig[], u32bit sig_len) const
{
return core.verify(sig, sig_len);
}
/*************************************************
* Return the maximum input size in bits *
*************************************************/
u32bit NR_PublicKey::max_input_bits() const
{
return (group_q().bits() - 1);
}
/*************************************************
* Return the size of each portion of the sig *
*************************************************/
u32bit NR_PublicKey::message_part_size() const
{
return group_q().bytes();
}
/*************************************************
* Create a NR private key *
*************************************************/
NR_PrivateKey::NR_PrivateKey(const DL_Group& grp,
RandomNumberGenerator& rng)
{
group = grp;
x = random_integer(rng, 2, group_q() - 1);
PKCS8_load_hook(true);
}
/*************************************************
* NR_PrivateKey Constructor *
*************************************************/
NR_PrivateKey::NR_PrivateKey(const DL_Group& grp, const BigInt& x1,
const BigInt& y1)
{
group = grp;
y = y1;
x = x1;
PKCS8_load_hook();
}
/*************************************************
* Algorithm Specific PKCS #8 Initialization Code *
*************************************************/
void NR_PrivateKey::PKCS8_load_hook(bool generated)
{
if(y == 0)
y = power_mod(group_g(), x, group_p());
core = NR_Core(group, y, x);
if(generated)
gen_check(global_state().prng_reference());
else
load_check(global_state().prng_reference());
}
/*************************************************
* Nyberg-Rueppel Signature Operation *
*************************************************/
SecureVector<byte> NR_PrivateKey::sign(const byte in[], u32bit length,
RandomNumberGenerator& rng) const
{
const BigInt& q = group_q();
BigInt k;
do
k.randomize(rng, q.bits());
while(k >= q);
return core.sign(in, length, k);
}
/*************************************************
* Check Private Nyberg-Rueppel Parameters *
*************************************************/
bool NR_PrivateKey::check_key(RandomNumberGenerator& rng, bool strong) const
{
if(!DL_Scheme_PrivateKey::check_key(rng, strong) || x >= group_q())
return false;
if(!strong)
return true;
try
{
KeyPair::check_key(rng,
get_pk_signer(*this, "EMSA1(SHA-1)"),
get_pk_verifier(*this, "EMSA1(SHA-1)")
);
}
catch(Self_Test_Failure)
{
return false;
}
return true;
}
}
|
