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
|
/*
* ECDH
* (C) 2007 Falko Strenzke, FlexSecure GmbH
* Manuel Hartl, FlexSecure GmbH
* (C) 2008-2010 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_ECDH_KEY_H__
#define BOTAN_ECDH_KEY_H__
#include <botan/ecc_key.h>
#include <botan/pk_ops.h>
namespace Botan {
/**
* This class represents ECDH Public Keys.
*/
class BOTAN_DLL ECDH_PublicKey : public virtual EC_PublicKey
{
public:
ECDH_PublicKey(const AlgorithmIdentifier& alg_id,
const MemoryRegion<byte>& key_bits) :
EC_PublicKey(alg_id, key_bits) {}
/**
* Construct a public key from a given public point.
* @param dom_par the domain parameters associated with this key
* @param public_point the public point defining this key
*/
ECDH_PublicKey(const EC_Group& dom_par,
const PointGFp& public_point) :
EC_PublicKey(dom_par, public_point) {}
/**
* Get this keys algorithm name.
* @return this keys algorithm name
*/
std::string algo_name() const { return "ECDH"; }
/**
* Get the maximum number of bits allowed to be fed to this key.
* This is the bitlength of the order of the base point.
* @return maximum number of input bits
*/
size_t max_input_bits() const { return domain().get_order().bits(); }
/**
* @return public point value
*/
MemoryVector<byte> public_value() const
{ return EC2OSP(public_point(), PointGFp::UNCOMPRESSED); }
protected:
ECDH_PublicKey() {}
};
/**
* This class represents ECDH Private Keys.
*/
class BOTAN_DLL ECDH_PrivateKey : public ECDH_PublicKey,
public EC_PrivateKey,
public PK_Key_Agreement_Key
{
public:
ECDH_PrivateKey(const AlgorithmIdentifier& alg_id,
const MemoryRegion<byte>& key_bits) :
EC_PrivateKey(alg_id, key_bits) {}
/**
* Generate a new private key
* @param rng a random number generator
* @param domain parameters to used for this key
* @param x the private key; if zero, a new random key is generated
*/
ECDH_PrivateKey(RandomNumberGenerator& rng,
const EC_Group& domain,
const BigInt& x = 0) :
EC_PrivateKey(rng, domain, x) {}
MemoryVector<byte> public_value() const
{ return ECDH_PublicKey::public_value(); }
};
/**
* ECDH operation
*/
class BOTAN_DLL ECDH_KA_Operation : public PK_Ops::Key_Agreement
{
public:
ECDH_KA_Operation(const ECDH_PrivateKey& key);
SecureVector<byte> agree(const byte w[], size_t w_len);
private:
const CurveGFp& curve;
const BigInt& cofactor;
BigInt l_times_priv;
};
}
#endif
|
