blob: 9a52e0e0ed9c87df48fd36ac1c0aa2ec82393674 (
plain)
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
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
/*
* TLS Cipher Suite
* (C) 2004-2010,2012,2013 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/tls_ciphersuite.h>
#include <botan/parsing.h>
#include <botan/block_cipher.h>
#include <botan/stream_cipher.h>
#include <botan/hash.h>
#include <botan/mac.h>
#include <algorithm>
namespace Botan {
namespace TLS {
bool Ciphersuite::is_scsv(u16bit suite)
{
// TODO: derive from IANA file in script
return (suite == 0x00FF || suite == 0x5600);
}
bool Ciphersuite::psk_ciphersuite() const
{
return (kex_algo() == "PSK" ||
kex_algo() == "DHE_PSK" ||
kex_algo() == "ECDHE_PSK");
}
bool Ciphersuite::ecc_ciphersuite() const
{
return (sig_algo() == "ECDSA" || kex_algo() == "ECDH" || kex_algo() == "ECDHE_PSK");
}
bool Ciphersuite::cbc_ciphersuite() const
{
return (cipher_algo() == "3DES" || cipher_algo() == "SEED" ||
cipher_algo() == "AES-128" || cipher_algo() == "AES-256" ||
cipher_algo() == "Camellia-128" || cipher_algo() == "Camellia-256");
}
Ciphersuite Ciphersuite::by_id(u16bit suite)
{
const std::vector<Ciphersuite>& all_suites = all_known_ciphersuites();
auto s = std::lower_bound(all_suites.begin(), all_suites.end(), suite);
if(s->ciphersuite_code() == suite)
{
return *s;
}
return Ciphersuite(); // some unknown ciphersuite
}
namespace {
bool have_hash(const std::string& prf)
{
return (HashFunction::providers(prf).size() > 0);
}
bool have_cipher(const std::string& cipher)
{
return (BlockCipher::providers(cipher).size() > 0) ||
(StreamCipher::providers(cipher).size() > 0);
}
}
bool Ciphersuite::is_usable() const
{
if(!m_cipher_keylen) // uninitialized object
return false;
if(!have_hash(prf_algo()))
return false;
if(mac_algo() == "AEAD")
{
if(cipher_algo() == "ChaCha20Poly1305")
{
#if !defined(BOTAN_HAS_AEAD_CHACHA20_POLY1305)
return false;
#endif
}
else
{
auto cipher_and_mode = split_on(cipher_algo(), '/');
BOTAN_ASSERT(cipher_and_mode.size() == 2, "Expected format for AEAD algo");
if(!have_cipher(cipher_and_mode[0]))
return false;
const auto mode = cipher_and_mode[1];
#if !defined(BOTAN_HAS_AEAD_CCM)
if(mode == "CCM" || mode == "CCM-8")
return false;
#endif
#if !defined(BOTAN_HAS_AEAD_GCM)
if(mode == "GCM")
return false;
#endif
#if !defined(BOTAN_HAS_AEAD_OCB)
if(mode == "OCB(12)" || mode == "OCB")
return false;
#endif
}
}
else
{
// Old non-AEAD schemes
if(!have_cipher(cipher_algo()))
return false;
if(!have_hash(mac_algo())) // HMAC
return false;
}
if(kex_algo() == "SRP_SHA")
{
#if !defined(BOTAN_HAS_SRP6)
return false;
#endif
}
else if(kex_algo() == "ECDH" || kex_algo() == "ECDHE_PSK")
{
#if !defined(BOTAN_HAS_ECDH)
return false;
#endif
}
else if(kex_algo() == "DH" || kex_algo() == "DHE_PSK")
{
#if !defined(BOTAN_HAS_DIFFIE_HELLMAN)
return false;
#endif
}
if(sig_algo() == "DSA")
{
#if !defined(BOTAN_HAS_DSA)
return false;
#endif
}
else if(sig_algo() == "ECDSA")
{
#if !defined(BOTAN_HAS_ECDSA)
return false;
#endif
}
else if(sig_algo() == "RSA")
{
#if !defined(BOTAN_HAS_RSA)
return false;
#endif
}
return true;
}
}
}
|
