Botan 2.19.5 Crypto and TLS for C&

scan_name.cpp
Go to the documentation of this file.
1/*
2* SCAN Name Abstraction
3* (C) 2008-2009,2015 Jack Lloyd
4*
5* Botan is released under the Simplified BSD License (see license.txt)
6*/
7
8#include <botan/scan_name.h>
9#include <botan/parsing.h>
10#include <botan/exceptn.h>
11
12 namespace Botan {
13
14 namespace {
15
16std::string make_arg(const std::vector<std::pair<size_t, std::string>>& name, size_t start)
17 {
18 std::string output = name[start].second;
19 size_t level = name[start].first;
20
21 size_t paren_depth = 0;
22
23 for(size_t i = start + 1; i != name.size(); ++i)
24 {
25 if(name[i].first <= name[start].first)
26 break;
27
28 if(name[i].first > level)
29 {
30 output += "(" + name[i].second;
31 ++paren_depth;
32 }
33 else if(name[i].first < level)
34 {
35 for (size_t j = name[i].first; j < level; j++) {
36 output += ")";
37 --paren_depth;
38 }
39 output += "," + name[i].second;
40 }
41 else
42 {
43 if(output[output.size() - 1] != '(')
44 output += ",";
45 output += name[i].second;
46 }
47
48 level = name[i].first;
49 }
50
51 for(size_t i = 0; i != paren_depth; ++i)
52 output += ")";
53
54 return output;
55 }
56
57}
58
59 SCAN_Name::SCAN_Name(const char* algo_spec) : SCAN_Name(std::string(algo_spec))
60 {
61 }
62
63 SCAN_Name::SCAN_Name(std::string algo_spec) : m_orig_algo_spec(algo_spec), m_alg_name(), m_args(), m_mode_info()
64 {
65 if(algo_spec.size() == 0)
66 throw Invalid_Argument("Expected algorithm name, got empty string");
67
68 std::vector<std::pair<size_t, std::string>> name;
69 size_t level = 0;
70 std::pair<size_t, std::string> accum = std::make_pair(level, "");
71
72 const std::string decoding_error = "Bad SCAN name '" + algo_spec + "': ";
73
74 for(size_t i = 0; i != algo_spec.size(); ++i)
75 {
76 char c = algo_spec[i];
77
78 if(c == '/' || c == ',' || c == '(' || c == ')')
79 {
80 if(c == '(')
81 ++level;
82 else if(c == ')')
83 {
84 if(level == 0)
85 throw Decoding_Error(decoding_error + "Mismatched parens");
86 --level;
87 }
88
89 if(c == '/' && level > 0)
90 accum.second.push_back(c);
91 else
92 {
93 if(accum.second != "")
94 name.push_back(accum);
95 accum = std::make_pair(level, "");
96 }
97 }
98 else
99 accum.second.push_back(c);
100 }
101
102 if(accum.second != "")
103 name.push_back(accum);
104
105 if(level != 0)
106 throw Decoding_Error(decoding_error + "Missing close paren");
107
108 if(name.size() == 0)
109 throw Decoding_Error(decoding_error + "Empty name");
110
111 m_alg_name = name[0].second;
112
113 bool in_modes = false;
114
115 for(size_t i = 1; i != name.size(); ++i)
116 {
117 if(name[i].first == 0)
118 {
119 m_mode_info.push_back(make_arg(name, i));
120 in_modes = true;
121 }
122 else if(name[i].first == 1 && !in_modes)
123 m_args.push_back(make_arg(name, i));
124 }
125 }
126
127std::string SCAN_Name::arg(size_t i) const
128 {
129 if(i >= arg_count())
130 throw Invalid_Argument("SCAN_Name::arg " + std::to_string(i) +
131 " out of range for '" + to_string() + "'");
132 return m_args[i];
133 }
134
135std::string SCAN_Name::arg(size_t i, const std::string& def_value) const
136 {
137 if(i >= arg_count())
138 return def_value;
139 return m_args[i];
140 }
141
142 size_t SCAN_Name::arg_as_integer(size_t i, size_t def_value) const
143 {
144 if(i >= arg_count())
145 return def_value;
146 return to_u32bit(m_args[i]);
147 }
148
149}
Botan::Decoding_Error
Definition: exceptn.h:200
Botan::Invalid_Argument
Definition: exceptn.h:137
Botan::SCAN_Name
Definition: scan_name.h:24
Botan::SCAN_Name::arg
std::string arg(size_t i) const
Definition: scan_name.cpp:127
Botan::SCAN_Name::to_string
const std::string & to_string() const
Definition: scan_name.h:41
Botan::SCAN_Name::arg_count
size_t arg_count() const
Definition: scan_name.h:56
Botan::SCAN_Name::SCAN_Name
SCAN_Name(const char *algo_spec)
Definition: scan_name.cpp:59
Botan::SCAN_Name::arg_as_integer
size_t arg_as_integer(size_t i, size_t def_value) const
Definition: scan_name.cpp:142
name
std::string name
Definition: commoncrypto_hash.cpp:24
Botan::ASN1::to_string
std::string to_string(const BER_Object &obj)
Definition: asn1_obj.cpp:213
Botan
Definition: alg_id.cpp:13
Botan::to_u32bit
uint32_t to_u32bit(const std::string &str)
Definition: parsing.cpp:35
std
Definition: bigint.h:1155