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
|
/*************************************************
* X.509 SIGNED Object Source File *
* (C) 1999-2008 The Botan Project *
*************************************************/
#include <botan/x509_obj.h>
#include <botan/x509_key.h>
#include <botan/look_pk.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>
#include <memory>
namespace Botan {
/*************************************************
* Create a generic X.509 object *
*************************************************/
X509_Object::X509_Object(DataSource& stream, const std::string& labels)
{
init(stream, labels);
}
/*************************************************
* Createa 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);
}
/*************************************************
* Read a PEM or BER X.509 object *
*************************************************/
void X509_Object::init(DataSource& in, const std::string& labels)
{
PEM_labels_allowed = split_on(labels, '/');
if(PEM_labels_allowed.size() < 1)
throw Invalid_Argument("Bad labels argument to X509_Object");
PEM_label_pref = PEM_labels_allowed[0];
std::sort(PEM_labels_allowed.begin(), PEM_labels_allowed.end());
try {
if(ASN1::maybe_BER(in) && !PEM_Code::matches(in))
decode_info(in);
else
{
std::string got_label;
DataSource_Memory ber(PEM_Code::decode(in, got_label));
if(!std::binary_search(PEM_labels_allowed.begin(),
PEM_labels_allowed.end(), got_label))
throw Decoding_Error("Invalid PEM label: " + got_label);
decode_info(ber);
}
}
catch(Decoding_Error)
{
throw Decoding_Error(PEM_label_pref + " decoding failed");
}
}
/*************************************************
* Read a BER encoded X.509 object *
*************************************************/
void X509_Object::decode_info(DataSource& source)
{
BER_Decoder(source)
.start_cons(SEQUENCE)
.start_cons(SEQUENCE)
.raw_bytes(tbs_bits)
.end_cons()
.decode(sig_algo)
.decode(sig, BIT_STRING)
.verify_end()
.end_cons();
}
/*************************************************
* Return a BER or PEM encoded X.509 object *
*************************************************/
void X509_Object::encode(Pipe& out, X509_Encoding encoding) const
{
SecureVector<byte> der = DER_Encoder()
.start_cons(SEQUENCE)
.start_cons(SEQUENCE)
.raw_bytes(tbs_bits)
.end_cons()
.encode(sig_algo)
.encode(sig, BIT_STRING)
.end_cons()
.get_contents();
if(encoding == PEM)
out.write(PEM_Code::encode(der, PEM_label_pref));
else
out.write(der);
}
/*************************************************
* Return a BER encoded X.509 object *
*************************************************/
SecureVector<byte> X509_Object::BER_encode() const
{
Pipe ber;
ber.start_msg();
encode(ber, RAW_BER);
ber.end_msg();
return ber.read_all();
}
/*************************************************
* Return a PEM encoded X.509 object *
*************************************************/
std::string X509_Object::PEM_encode() const
{
Pipe pem;
pem.start_msg();
encode(pem, PEM);
pem.end_msg();
return pem.read_all_as_string();
}
/*************************************************
* Return the TBS data *
*************************************************/
SecureVector<byte> X509_Object::tbs_data() const
{
return ASN1::put_in_sequence(tbs_bits);
}
/*************************************************
* Return the signature of this object *
*************************************************/
SecureVector<byte> X509_Object::signature() const
{
return sig;
}
/*************************************************
* Return the algorithm used to sign this object *
*************************************************/
AlgorithmIdentifier X509_Object::signature_algorithm() const
{
return sig_algo;
}
/*************************************************
* Check the signature on an object *
*************************************************/
bool X509_Object::check_signature(Public_Key& pub_key) const
{
try {
std::vector<std::string> sig_info =
split_on(OIDS::lookup(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;
std::auto_ptr<PK_Verifier> verifier;
if(dynamic_cast<PK_Verifying_with_MR_Key*>(&pub_key))
{
PK_Verifying_with_MR_Key& sig_key =
dynamic_cast<PK_Verifying_with_MR_Key&>(pub_key);
verifier.reset(get_pk_verifier(sig_key, padding, format));
}
else if(dynamic_cast<PK_Verifying_wo_MR_Key*>(&pub_key))
{
PK_Verifying_wo_MR_Key& sig_key =
dynamic_cast<PK_Verifying_wo_MR_Key&>(pub_key);
verifier.reset(get_pk_verifier(sig_key, padding, format));
}
else
return false;
return verifier->verify_message(tbs_data(), signature());
}
catch(...)
{
return false;
}
}
/*************************************************
* Apply the X.509 SIGNED macro *
*************************************************/
MemoryVector<byte> X509_Object::make_signed(PK_Signer* signer,
const AlgorithmIdentifier& algo,
const MemoryRegion<byte>& tbs_bits)
{
return DER_Encoder()
.start_cons(SEQUENCE)
.raw_bytes(tbs_bits)
.encode(algo)
.encode(signer->sign_message(tbs_bits), BIT_STRING)
.end_cons()
.get_contents();
}
/*************************************************
* Try to decode the actual information *
*************************************************/
void X509_Object::do_decode()
{
try {
force_decode();
}
catch(Decoding_Error& e)
{
const std::string what = e.what();
throw Decoding_Error(PEM_label_pref + " decoding failed (" +
what.substr(23, std::string::npos) + ")");
}
catch(Invalid_Argument& e)
{
const std::string what = e.what();
throw Decoding_Error(PEM_label_pref + " decoding failed (" +
what.substr(7, std::string::npos) + ")");
}
}
}
|
