Botan: src/pubkey/ec_group/ec_group.h Source File

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ec_group.h
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1 /*
2 * ECC Domain Parameters
3 *
4 * (C) 2007 Falko Strenzke, FlexSecure GmbH
5 * 2008-2010 Jack Lloyd
6 *
7 * Distributed under the terms of the Botan license
8 */
9
10 #ifndef BOTAN_ECC_DOMAIN_PARAMETERS_H__
11 #define BOTAN_ECC_DOMAIN_PARAMETERS_H__
12
13 #include <botan/point_gfp.h>
14 #include <botan/curve_gfp.h>
15 #include <botan/asn1_oid.h>
16
17 namespace Botan {
18
19 /**
20 * This class represents elliptic curce domain parameters
21 */
22 enum EC_Group_Encoding {
23 EC_DOMPAR_ENC_EXPLICIT = 0,
24 EC_DOMPAR_ENC_IMPLICITCA = 1,
25 EC_DOMPAR_ENC_OID = 2
26 };
27
28 /**
29 * Class representing an elliptic curve
30 */
31 class BOTAN_DLL EC_Group
32 {
33 public:
34
35 /**
36 * Construct Domain paramers from specified parameters
37 * @param curve elliptic curve
38 * @param base_point a base point
39 * @param order the order of the base point
40 * @param cofactor the cofactor
41 */
42 EC_Group(const CurveGFp& curve,
43 const PointGFp& base_point,
44 const BigInt& order,
45 const BigInt& cofactor) :
46 curve(curve),
47 base_point(base_point),
48 order(order),
49 cofactor(cofactor),
50 oid("")
51 {}
52
53 /**
54 * Decode a BER encoded ECC domain parameter set
55 * @param ber_encoding the bytes of the BER encoding
56 */
57 EC_Group(const MemoryRegion<byte>& ber_encoding);
58
59 /**
60 * Create an EC domain by OID (or throw if unknown)
61 * @param oid the OID of the EC domain to create
62 */
63 EC_Group(const OID& oid);
64
65 /**
66 * Create an EC domain from PEM encoding (as from PEM_encode),
67 * or from an OID name (eg "secp160r1", or "1.3.132.0.8")
68 * @param pem_or_oid PEM-encoded data, or an OID
69 */
70 EC_Group(const std::string& pem_or_oid = "");
71
72 /**
73 * Create the DER encoding of this domain
74 * @param form of encoding to use
75 * @returns bytes encododed as DER
76 */
77 SecureVector<byte> DER_encode(EC_Group_Encoding form) const;
78
79 /**
80 * Return the PEM encoding (always in explicit form)
81 * @return string containing PEM data
82 */
83 std::string PEM_encode() const;
84
85 /**
86 * Return domain parameter curve
87 * @result domain parameter curve
88 */
89 const CurveGFp& get_curve() const { return curve; }
90
91 /**
92 * Return domain parameter curve
93 * @result domain parameter curve
94 */
95 const PointGFp& get_base_point() const { return base_point; }
96
97 /**
98 * Return the order of the base point
99 * @result order of the base point
100 */
101 const BigInt& get_order() const { return order; }
102
103 /**
104 * Return the cofactor
105 * @result the cofactor
106 */
107 const BigInt& get_cofactor() const { return cofactor; }
108
109 bool initialized() const { return !base_point.is_zero(); }
110
111 /**
112 * Return the OID of these domain parameters
113 * @result the OID
114 */
115 std::string get_oid() const { return oid; }
116
117 bool operator==(const EC_Group& other) const
118 {
119 return ((get_curve() == other.get_curve()) &&
120 (get_base_point() == other.get_base_point()) &&
121 (get_order() == other.get_order()) &&
122 (get_cofactor() == other.get_cofactor()));
123 }
124
125 private:
126 CurveGFp curve;
127 PointGFp base_point;
128 BigInt order, cofactor;
129 std::string oid;
130 };
131
132 inline bool operator!=(const EC_Group& lhs,
133 const EC_Group& rhs)
134 {
135 return !(lhs == rhs);
136 }
137
138 // For compatability with 1.8
139 typedef EC_Group EC_Domain_Params;
140
141 }
142
143 #endif
Botan::EC_Group::get_oid
std::string get_oid() const
Definition: ec_group.h:115
Botan::operator!=
bool operator!=(const OctetString &s1, const OctetString &s2)
Definition: symkey.cpp:106
Botan::BigInt
Definition: bigint.h:22
Botan::EC_DOMPAR_ENC_EXPLICIT
Definition: ec_group.h:23
Botan::PointGFp
Definition: point_gfp.h:41
Botan::EC_Group::get_base_point
const PointGFp & get_base_point() const
Definition: ec_group.h:95
Botan::PKCS8::PEM_encode
std::string PEM_encode(const Private_Key &key)
Definition: pkcs8.cpp:150
Botan::EC_Domain_Params
EC_Group EC_Domain_Params
Definition: ec_group.h:139
Botan::EC_Group::get_curve
const CurveGFp & get_curve() const
Definition: ec_group.h:89
Botan::EC_DOMPAR_ENC_IMPLICITCA
Definition: ec_group.h:24
Botan::EC_Group::get_order
const BigInt & get_order() const
Definition: ec_group.h:101
Botan::EC_Group::EC_Group
EC_Group(const CurveGFp &curve, const PointGFp &base_point, const BigInt &order, const BigInt &cofactor)
Definition: ec_group.h:42
Botan::MemoryRegion< byte >
Botan
Definition: algo_base.h:14
Botan::EC_Group::operator==
bool operator==(const EC_Group &other) const
Definition: ec_group.h:117
Botan::EC_DOMPAR_ENC_OID
Definition: ec_group.h:25
Botan::EC_Group
Definition: ec_group.h:31
Botan::EC_Group_Encoding
EC_Group_Encoding
Definition: ec_group.h:22
Botan::EC_Group::initialized
bool initialized() const
Definition: ec_group.h:109
Botan::SecureVector< byte >
Botan::OID
Definition: asn1_oid.h:20
Botan::CurveGFp
Definition: curve_gfp.h:20
oid
OID oid
Definition: x509_ext.cpp:446
Botan::EC_Group::get_cofactor
const BigInt & get_cofactor() const
Definition: ec_group.h:107