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Root/botan/asn1_alt.cpp

1/*************************************************
2* AlternativeName Source File *
3* (C) 1999-2006 The Botan Project *
4*************************************************/
5
6#include <botan/asn1_obj.h>
7#include <botan/der_enc.h>
8#include <botan/ber_dec.h>
9#include <botan/oids.h>
10#include <botan/stl_util.h>
11#include <botan/charset.h>
12
13namespace Botan {
14
15/*************************************************
16* Create an AlternativeName *
17*************************************************/
18AlternativeName::AlternativeName(const std::string& email_addr,
19 const std::string& uri,
20 const std::string& dns)
21 {
22 add_attribute("RFC822", email_addr);
23 add_attribute("DNS", dns);
24 add_attribute("URI", uri);
25 }
26
27/*************************************************
28* Add an attribute to an alternative name *
29*************************************************/
30void AlternativeName::add_attribute(const std::string& type,
31 const std::string& str)
32 {
33 if(type == "" || str == "")
34 return;
35
36 typedef std::multimap<std::string, std::string>::iterator iter;
37 std::pair<iter, iter> range = alt_info.equal_range(type);
38 for(iter j = range.first; j != range.second; ++j)
39 if(j->second == str)
40 return;
41
42 multimap_insert(alt_info, type, str);
43 }
44
45/*************************************************
46* Add an OtherName field *
47*************************************************/
48void AlternativeName::add_othername(const OID& oid, const std::string& value,
49 ASN1_Tag type)
50 {
51 if(value == "")
52 return;
53 multimap_insert(othernames, oid, ASN1_String(value, type));
54 }
55
56/*************************************************
57* Get the attributes of this alternative name *
58*************************************************/
59std::multimap<std::string, std::string> AlternativeName::get_attributes() const
60 {
61 return alt_info;
62 }
63
64/*************************************************
65* Get the otherNames *
66*************************************************/
67std::multimap<OID, ASN1_String> AlternativeName::get_othernames() const
68 {
69 return othernames;
70 }
71
72/*************************************************
73* Return all of the alternative names *
74*************************************************/
75std::multimap<std::string, std::string> AlternativeName::contents() const
76 {
77 std::multimap<std::string, std::string> names;
78
79 typedef std::multimap<std::string, std::string>::const_iterator rdn_iter;
80 for(rdn_iter j = alt_info.begin(); j != alt_info.end(); ++j)
81 multimap_insert(names, j->first, j->second);
82
83 typedef std::multimap<OID, ASN1_String>::const_iterator on_iter;
84 for(on_iter j = othernames.begin(); j != othernames.end(); ++j)
85 multimap_insert(names, OIDS::lookup(j->first), j->second.value());
86
87 return names;
88 }
89
90/*************************************************
91* Return if this object has anything useful *
92*************************************************/
93bool AlternativeName::has_items() const
94 {
95 return (alt_info.size() > 0 || othernames.size() > 0);
96 }
97
98namespace {
99
100/*************************************************
101* DER encode an AlternativeName entry *
102*************************************************/
103void encode_entries(DER_Encoder& encoder,
104 const std::multimap<std::string, std::string>& attr,
105 const std::string& type, ASN1_Tag tagging)
106 {
107 typedef std::multimap<std::string, std::string>::const_iterator iter;
108
109 std::pair<iter, iter> range = attr.equal_range(type);
110 for(iter j = range.first; j != range.second; ++j)
111 {
112 ASN1_String asn1_string(j->second, IA5_STRING);
113 encoder.add_object(tagging, CONTEXT_SPECIFIC, asn1_string.iso_8859());
114 }
115 }
116
117}
118
119/*************************************************
120* DER encode an AlternativeName extension *
121*************************************************/
122void AlternativeName::encode_into(DER_Encoder& der) const
123 {
124 der.start_cons(SEQUENCE);
125
126 encode_entries(der, alt_info, "RFC822", ASN1_Tag(1));
127 encode_entries(der, alt_info, "DNS", ASN1_Tag(2));
128 encode_entries(der, alt_info, "URI", ASN1_Tag(6));
129
130 std::multimap<OID, ASN1_String>::const_iterator i;
131 for(i = othernames.begin(); i != othernames.end(); ++i)
132 {
133 der.start_explicit(0)
134 .encode(i->first)
135 .start_explicit(0)
136 .encode(i->second)
137 .end_explicit()
138 .end_explicit();
139 }
140
141 der.end_cons();
142 }
143
144/*************************************************
145* Decode a BER encoded AlternativeName *
146*************************************************/
147void AlternativeName::decode_from(BER_Decoder& source)
148 {
149 BER_Decoder names = source.start_cons(SEQUENCE);
150
151 while(names.more_items())
152 {
153 BER_Object obj = names.get_next_object();
154 if((obj.class_tag != CONTEXT_SPECIFIC) &&
155 (obj.class_tag != (CONTEXT_SPECIFIC | CONSTRUCTED)))
156 continue;
157
158 ASN1_Tag tag = obj.type_tag;
159
160 if(tag == 0)
161 {
162 BER_Decoder othername(obj.value);
163
164 OID oid;
165 othername.decode(oid);
166 if(othername.more_items())
167 {
168 BER_Object othername_value_outer = othername.get_next_object();
169 othername.verify_end();
170
171 if(othername_value_outer.type_tag != ASN1_Tag(0) ||
172 othername_value_outer.class_tag !=
173 (CONTEXT_SPECIFIC | CONSTRUCTED)
174 )
175 throw Decoding_Error("Invalid tags on otherName value");
176
177 BER_Decoder othername_value_inner(othername_value_outer.value);
178
179 BER_Object value = othername_value_inner.get_next_object();
180 othername_value_inner.verify_end();
181
182 ASN1_Tag value_type = value.type_tag;
183
184 if(is_string_type(value_type) && value.class_tag == UNIVERSAL)
185 add_othername(oid, ASN1::to_string(value), value_type);
186 }
187 }
188 else if(tag == 1 || tag == 2 || tag == 6)
189 {
190 const std::string value = Charset::transcode(ASN1::to_string(obj),
191 LATIN1_CHARSET,
192 LOCAL_CHARSET);
193
194 if(tag == 1) add_attribute("RFC822", value);
195 if(tag == 2) add_attribute("DNS", value);
196 if(tag == 6) add_attribute("URI", value);
197 }
198
199 }
200 }
201
202}

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