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
139
140
141
142
143
|
/*
* ECC Domain Parameters
*
* (C) 2007 Falko Strenzke, FlexSecure GmbH
* 2008-2010 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_ECC_DOMAIN_PARAMETERS_H__
#define BOTAN_ECC_DOMAIN_PARAMETERS_H__
#include <botan/point_gfp.h>
#include <botan/curve_gfp.h>
#include <botan/asn1_oid.h>
namespace Botan {
/**
* This class represents elliptic curce domain parameters
*/
enum EC_Group_Encoding {
EC_DOMPAR_ENC_EXPLICIT = 0,
EC_DOMPAR_ENC_IMPLICITCA = 1,
EC_DOMPAR_ENC_OID = 2
};
/**
* Class representing an elliptic curve
*/
class BOTAN_DLL EC_Group
{
public:
/**
* Construct Domain paramers from specified parameters
* @param curve elliptic curve
* @param base_point a base point
* @param order the order of the base point
* @param cofactor the cofactor
*/
EC_Group(const CurveGFp& curve,
const PointGFp& base_point,
const BigInt& order,
const BigInt& cofactor) :
curve(curve),
base_point(base_point),
order(order),
cofactor(cofactor),
oid("")
{}
/**
* Decode a BER encoded ECC domain parameter set
* @param ber_encoding the bytes of the BER encoding
*/
EC_Group(const std::vector<byte>& ber_encoding);
/**
* Create an EC domain by OID (or throw if unknown)
* @param oid the OID of the EC domain to create
*/
EC_Group(const OID& oid);
/**
* Create an EC domain from PEM encoding (as from PEM_encode), or
* from an OID name (eg "secp256r1", or "1.2.840.10045.3.1.7")
* @param pem_or_oid PEM-encoded data, or an OID
*/
EC_Group(const std::string& pem_or_oid = "");
/**
* Create the DER encoding of this domain
* @param form of encoding to use
* @returns bytes encododed as DER
*/
std::vector<byte> DER_encode(EC_Group_Encoding form) const;
/**
* Return the PEM encoding (always in explicit form)
* @return string containing PEM data
*/
std::string PEM_encode() const;
/**
* Return domain parameter curve
* @result domain parameter curve
*/
const CurveGFp& get_curve() const { return curve; }
/**
* Return domain parameter curve
* @result domain parameter curve
*/
const PointGFp& get_base_point() const { return base_point; }
/**
* Return the order of the base point
* @result order of the base point
*/
const BigInt& get_order() const { return order; }
/**
* Return the cofactor
* @result the cofactor
*/
const BigInt& get_cofactor() const { return cofactor; }
bool initialized() const { return !base_point.is_zero(); }
/**
* Return the OID of these domain parameters
* @result the OID
*/
std::string get_oid() const { return oid; }
bool operator==(const EC_Group& other) const
{
return ((get_curve() == other.get_curve()) &&
(get_base_point() == other.get_base_point()) &&
(get_order() == other.get_order()) &&
(get_cofactor() == other.get_cofactor()));
}
private:
CurveGFp curve;
PointGFp base_point;
BigInt order, cofactor;
std::string oid;
};
inline bool operator!=(const EC_Group& lhs,
const EC_Group& rhs)
{
return !(lhs == rhs);
}
// For compatability with 1.8
typedef EC_Group EC_Domain_Params;
}
#endif
|
