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/*************************************************
* AlternativeName Source File *
* (C) 1999-2006 The Botan Project *
*************************************************/
#include <botan/asn1_obj.h>
#include <botan/stl_util.h>
#include <botan/charset.h>
namespace Botan {
/*************************************************
* Create an AlternativeName *
*************************************************/
AlternativeName::AlternativeName(const std::string& email_addr,
const std::string& uri,
const std::string& dns)
{
add_attribute("RFC822", email_addr);
add_attribute("DNS", dns);
add_attribute("URI", uri);
}
/*************************************************
* Add an attribute to an alternative name *
*************************************************/
void AlternativeName::add_attribute(const std::string& type,
const std::string& str)
{
if(type == "" || str == "")
return;
typedef std::multimap<std::string, std::string>::iterator iter;
std::pair<iter, iter> range = alt_info.equal_range(type);
for(iter j = range.first; j != range.second; ++j)
if(j->second == str)
return;
multimap_insert(alt_info, type, str);
}
/*************************************************
* Add an OtherName field *
*************************************************/
void AlternativeName::add_othername(const OID& oid, const std::string& value,
ASN1_Tag type)
{
if(value == "")
return;
multimap_insert(othernames, oid, ASN1_String(value, type));
}
/*************************************************
* Get the attributes of this alternative name *
*************************************************/
std::multimap<std::string, std::string> AlternativeName::get_attributes() const
{
return alt_info;
}
/*************************************************
* Get the otherNames *
*************************************************/
std::multimap<OID, ASN1_String> AlternativeName::get_othernames() const
{
return othernames;
}
/*************************************************
* Return if this object has anything useful *
*************************************************/
bool AlternativeName::has_items() const
{
return (alt_info.size() > 0 || othernames.size() > 0);
}
namespace {
/*************************************************
* DER encode an AlternativeName entry *
*************************************************/
void encode_entries(DER_Encoder& encoder,
const std::multimap<std::string, std::string>& attr,
const std::string& type, ASN1_Tag tagging)
{
typedef std::multimap<std::string, std::string>::const_iterator iter;
std::pair<iter, iter> range = attr.equal_range(type);
for(iter j = range.first; j != range.second; ++j)
{
ASN1_String asn1_string(j->second, IA5_STRING);
DER::encode(encoder, asn1_string, tagging, CONTEXT_SPECIFIC);
}
}
}
/*************************************************
* DER encode an AlternativeName extension *
*************************************************/
void AlternativeName::encode_into(DER_Encoder& der) const
{
der.start_sequence();
encode_entries(der, alt_info, "RFC822", ASN1_Tag(1));
encode_entries(der, alt_info, "DNS", ASN1_Tag(2));
encode_entries(der, alt_info, "URI", ASN1_Tag(6));
std::multimap<OID, ASN1_String>::const_iterator i;
for(i = othernames.begin(); i != othernames.end(); ++i)
{
der.start_explicit(ASN1_Tag(0))
.encode(i->first)
.start_explicit(ASN1_Tag(0))
.encode(i->second)
.end_explicit(ASN1_Tag(0))
.end_explicit(ASN1_Tag(0));
}
der.end_sequence();
}
namespace BER {
/*************************************************
* Decode a BER encoded AlternativeName *
*************************************************/
void decode(BER_Decoder& source, AlternativeName& alt_name)
{
BER_Decoder names = BER::get_subsequence(source);
while(names.more_items())
{
BER_Object obj = names.get_next_object();
if((obj.class_tag != CONTEXT_SPECIFIC) &&
(obj.class_tag != (CONTEXT_SPECIFIC | CONSTRUCTED)))
continue;
ASN1_Tag tag = obj.type_tag;
if(tag == 0)
{
BER_Decoder othername(obj.value);
OID oid;
BER::decode(othername, oid);
if(othername.more_items())
{
BER_Object othername_value_outer = othername.get_next_object();
othername.verify_end();
if(othername_value_outer.type_tag != ASN1_Tag(0) ||
othername_value_outer.class_tag !=
(CONTEXT_SPECIFIC | CONSTRUCTED)
)
throw Decoding_Error("Invalid tags on otherName value");
BER_Decoder othername_value_inner(othername_value_outer.value);
BER_Object value = othername_value_inner.get_next_object();
othername_value_inner.verify_end();
ASN1_Tag value_type = value.type_tag;
if(is_string_type(value_type) && value.class_tag == UNIVERSAL)
alt_name.add_othername(oid, BER::to_string(value), value_type);
}
}
else if(tag == 1 || tag == 2 || tag == 6)
{
const std::string value = iso2local(BER::to_string(obj));
if(tag == 1) alt_name.add_attribute("RFC822", value);
if(tag == 2) alt_name.add_attribute("DNS", value);
if(tag == 6) alt_name.add_attribute("URI", value);
}
}
}
}
}
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