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
|
/*
* ECC Key implemenation
* (C) 2007 Manuel Hartl, FlexSecure GmbH
* Falko Strenzke, FlexSecure GmbH
* 2008-2010 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/ecc_key.h>
#include <botan/x509_key.h>
#include <botan/numthry.h>
#include <botan/der_enc.h>
#include <botan/ber_dec.h>
#include <botan/secmem.h>
#include <botan/point_gfp.h>
#include <botan/internal/assert.h>
namespace Botan {
EC_PublicKey::EC_PublicKey(const EC_Group& dom_par,
const PointGFp& pub_point) :
domain_params(dom_par), public_key(pub_point),
domain_encoding(EC_DOMPAR_ENC_EXPLICIT)
{
if(domain().get_curve() != public_point().get_curve())
throw Invalid_Argument("EC_PublicKey: curve mismatch in constructor");
}
EC_PublicKey::EC_PublicKey(const AlgorithmIdentifier& alg_id,
const MemoryRegion<byte>& key_bits)
{
domain_params = EC_Group(alg_id.parameters);
domain_encoding = EC_DOMPAR_ENC_EXPLICIT;
public_key = OS2ECP(key_bits, domain().get_curve());
}
bool EC_PublicKey::check_key(RandomNumberGenerator&,
bool) const
{
return public_point().on_the_curve();
}
AlgorithmIdentifier EC_PublicKey::algorithm_identifier() const
{
return AlgorithmIdentifier(get_oid(), DER_domain());
}
MemoryVector<byte> EC_PublicKey::x509_subject_public_key() const
{
return EC2OSP(public_point(), PointGFp::COMPRESSED);
}
void EC_PublicKey::set_parameter_encoding(EC_Group_Encoding form)
{
if(form != EC_DOMPAR_ENC_EXPLICIT &&
form != EC_DOMPAR_ENC_IMPLICITCA &&
form != EC_DOMPAR_ENC_OID)
throw Invalid_Argument("Invalid encoding form for EC-key object specified");
if((form == EC_DOMPAR_ENC_OID) && (domain_params.get_oid() == ""))
throw Invalid_Argument("Invalid encoding form OID specified for "
"EC-key object whose corresponding domain "
"parameters are without oid");
domain_encoding = form;
}
const BigInt& EC_PrivateKey::private_value() const
{
if(private_key == 0)
throw Invalid_State("EC_PrivateKey::private_value - uninitialized");
return private_key;
}
/**
* EC_PrivateKey constructor
*/
EC_PrivateKey::EC_PrivateKey(RandomNumberGenerator& rng,
const EC_Group& ec_group,
const BigInt& x)
{
domain_params = ec_group;
domain_encoding = EC_DOMPAR_ENC_EXPLICIT;
if(x == 0)
private_key = BigInt::random_integer(rng, 1, domain().get_order());
else
private_key = x;
public_key = domain().get_base_point() * private_key;
BOTAN_ASSERT(public_key.on_the_curve(),
"ECC private key was not on the curve");
}
MemoryVector<byte> EC_PrivateKey::pkcs8_private_key() const
{
return DER_Encoder()
.start_cons(SEQUENCE)
.encode(static_cast<size_t>(1))
.encode(BigInt::encode_1363(private_key, private_key.bytes()),
OCTET_STRING)
.end_cons()
.get_contents();
}
EC_PrivateKey::EC_PrivateKey(const AlgorithmIdentifier& alg_id,
const MemoryRegion<byte>& key_bits)
{
domain_params = EC_Group(alg_id.parameters);
domain_encoding = EC_DOMPAR_ENC_EXPLICIT;
BER_Decoder(key_bits)
.start_cons(SEQUENCE)
.decode_and_check<size_t>(1, "Unknown version code for ECC key")
.decode_octet_string_bigint(private_key)
.verify_end()
.end_cons();
public_key = domain().get_base_point() * private_key;
BOTAN_ASSERT(public_key.on_the_curve(),
"Loaded ECC private key not on the curve");
}
}
|
