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
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
|
/*
* X.509 SIGNED Object
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/x509_obj.h>
#include <botan/x509_key.h>
#include <botan/pubkey.h>
#include <botan/oids.h>
#include <botan/der_enc.h>
#include <botan/ber_dec.h>
#include <botan/parsing.h>
#include <botan/pem.h>
#include <algorithm>
namespace Botan {
/*
* Create a generic X.509 object
*/
X509_Object::X509_Object(DataSource& stream, const std::string& labels)
{
init(stream, labels);
}
/*
* Create a generic X.509 object
*/
X509_Object::X509_Object(const std::string& file, const std::string& labels)
{
DataSource_Stream stream(file, true);
init(stream, labels);
}
/*
* Create a generic X.509 object
*/
X509_Object::X509_Object(const std::vector<byte>& vec, const std::string& labels)
{
DataSource_Memory stream(vec.data(), vec.size());
init(stream, labels);
}
/*
* Read a PEM or BER X.509 object
*/
void X509_Object::init(DataSource& in, const std::string& labels)
{
m_PEM_labels_allowed = split_on(labels, '/');
if(m_PEM_labels_allowed.size() < 1)
throw Invalid_Argument("Bad labels argument to X509_Object");
m_PEM_label_pref = m_PEM_labels_allowed[0];
std::sort(m_PEM_labels_allowed.begin(), m_PEM_labels_allowed.end());
try {
if(ASN1::maybe_BER(in) && !PEM_Code::matches(in))
{
BER_Decoder dec(in);
decode_from(dec);
}
else
{
std::string got_label;
DataSource_Memory ber(PEM_Code::decode(in, got_label));
if(!std::binary_search(m_PEM_labels_allowed.begin(),
m_PEM_labels_allowed.end(), got_label))
throw Decoding_Error("Invalid PEM label: " + got_label);
BER_Decoder dec(ber);
decode_from(dec);
}
}
catch(Decoding_Error& e)
{
throw Decoding_Error(m_PEM_label_pref + " decoding failed: " + e.what());
}
}
void X509_Object::encode_into(DER_Encoder& to) const
{
to.start_cons(SEQUENCE)
.start_cons(SEQUENCE)
.raw_bytes(m_tbs_bits)
.end_cons()
.encode(m_sig_algo)
.encode(m_sig, BIT_STRING)
.end_cons();
}
/*
* Read a BER encoded X.509 object
*/
void X509_Object::decode_from(BER_Decoder& from)
{
from.start_cons(SEQUENCE)
.start_cons(SEQUENCE)
.raw_bytes(m_tbs_bits)
.end_cons()
.decode(m_sig_algo)
.decode(m_sig, BIT_STRING)
.verify_end()
.end_cons();
}
/*
* Return a BER encoded X.509 object
*/
std::vector<byte> X509_Object::BER_encode() const
{
DER_Encoder der;
encode_into(der);
return der.get_contents_unlocked();
}
/*
* Return a PEM encoded X.509 object
*/
std::string X509_Object::PEM_encode() const
{
return PEM_Code::encode(BER_encode(), m_PEM_label_pref);
}
/*
* Return the TBS data
*/
std::vector<byte> X509_Object::tbs_data() const
{
return ASN1::put_in_sequence(m_tbs_bits);
}
/*
* Return the signature of this object
*/
std::vector<byte> X509_Object::signature() const
{
return m_sig;
}
/*
* Return the algorithm used to sign this object
*/
AlgorithmIdentifier X509_Object::signature_algorithm() const
{
return m_sig_algo;
}
/*
* Return the hash used in generating the signature
*/
std::string X509_Object::hash_used_for_signature() const
{
std::vector<std::string> sig_info =
split_on(OIDS::lookup(m_sig_algo.oid), '/');
if(sig_info.size() != 2)
throw Internal_Error("Invalid name format found for " +
m_sig_algo.oid.as_string());
std::vector<std::string> pad_and_hash =
parse_algorithm_name(sig_info[1]);
if(pad_and_hash.size() != 2)
throw Internal_Error("Invalid name format " + sig_info[1]);
return pad_and_hash[1];
}
/*
* Check the signature on an object
*/
bool X509_Object::check_signature(const Public_Key* pub_key) const
{
if(!pub_key)
throw Exception("No key provided for " + m_PEM_label_pref + " signature check");
std::unique_ptr<const Public_Key> key(pub_key);
return check_signature(*key);
}
/*
* Check the signature on an object
*/
bool X509_Object::check_signature(const Public_Key& pub_key) const
{
try {
std::vector<std::string> sig_info =
split_on(OIDS::lookup(m_sig_algo.oid), '/');
if(sig_info.size() != 2 || sig_info[0] != pub_key.algo_name())
return false;
std::string padding = sig_info[1];
Signature_Format format =
(pub_key.message_parts() >= 2) ? DER_SEQUENCE : IEEE_1363;
PK_Verifier verifier(pub_key, padding, format);
return verifier.verify_message(tbs_data(), signature());
}
catch(std::exception&)
{
return false;
}
}
/*
* Apply the X.509 SIGNED macro
*/
std::vector<byte> X509_Object::make_signed(PK_Signer* signer,
RandomNumberGenerator& rng,
const AlgorithmIdentifier& algo,
const secure_vector<byte>& tbs_bits)
{
return DER_Encoder()
.start_cons(SEQUENCE)
.raw_bytes(tbs_bits)
.encode(algo)
.encode(signer->sign_message(tbs_bits, rng), BIT_STRING)
.end_cons()
.get_contents_unlocked();
}
/*
* Try to decode the actual information
*/
void X509_Object::do_decode()
{
try {
force_decode();
}
catch(Decoding_Error& e)
{
throw Decoding_Error(m_PEM_label_pref + " decoding failed (" +
e.what() + ")");
}
catch(Invalid_Argument& e)
{
throw Decoding_Error(m_PEM_label_pref + " decoding failed (" +
e.what() + ")");
}
}
}
|
