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/*************************************************
* Simple ASN.1 String Types Source File *
* (C) 1999-2005 The Botan Project *
*************************************************/
#include <botan/asn1_obj.h>
#include <botan/charset.h>
#include <botan/parsing.h>
#include <botan/conf.h>
namespace Botan {
namespace {
/*************************************************
* Choose an encoding for the string *
*************************************************/
ASN1_Tag choose_encoding(const std::string& str)
{
static const byte IS_PRINTABLE[256] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00,
0x00, 0x01, 0x00, 0x01, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00 };
for(u32bit j = 0; j != str.size(); j++)
if(!IS_PRINTABLE[(byte)str[j]])
{
const std::string type = Config::get_string("x509/ca/str_type");
if(type == "utf8") return UTF8_STRING;
if(type == "latin1") return T61_STRING;
throw Invalid_Argument("Bad setting for x509/ca/str_type: " + type);
}
return PRINTABLE_STRING;
}
}
/*************************************************
* Check if type is a known ASN.1 string type *
*************************************************/
bool is_string_type(ASN1_Tag tag)
{
if(tag == NUMERIC_STRING || tag == PRINTABLE_STRING ||
tag == VISIBLE_STRING || tag == T61_STRING || tag == IA5_STRING ||
tag == UTF8_STRING || tag == BMP_STRING)
return true;
return false;
}
/*************************************************
* Create an ASN1_String *
*************************************************/
ASN1_String::ASN1_String(const std::string& str, ASN1_Tag t) : tag(t)
{
iso_8859_str = local2iso(str);
if(tag == DIRECTORY_STRING)
tag = choose_encoding(iso_8859_str);
if(tag != NUMERIC_STRING &&
tag != PRINTABLE_STRING &&
tag != VISIBLE_STRING &&
tag != T61_STRING &&
tag != IA5_STRING &&
tag != UTF8_STRING &&
tag != BMP_STRING)
throw Invalid_Argument("ASN1_String: Unknown string type " +
to_string(tag));
}
/*************************************************
* Create an ASN1_String *
*************************************************/
ASN1_String::ASN1_String(const std::string& str)
{
iso_8859_str = local2iso(str);
tag = choose_encoding(iso_8859_str);
}
/*************************************************
* Return this string in ISO 8859-1 encoding *
*************************************************/
std::string ASN1_String::iso_8859() const
{
return iso_8859_str;
}
/*************************************************
* Return this string in local encoding *
*************************************************/
std::string ASN1_String::value() const
{
return iso2local(iso_8859_str);
}
/*************************************************
* Return the type of this string object *
*************************************************/
ASN1_Tag ASN1_String::tagging() const
{
return tag;
}
namespace DER {
/*************************************************
* DER encode an ASN1_String *
*************************************************/
void encode(DER_Encoder& encoder, const ASN1_String& string,
ASN1_Tag type_tag, ASN1_Tag class_tag)
{
if(string.tagging() == UTF8_STRING)
encoder.add_object(type_tag, class_tag, iso2utf(string.iso_8859()));
else
encoder.add_object(type_tag, class_tag, string.iso_8859());
}
/*************************************************
* DER encode an ASN1_String *
*************************************************/
void encode(DER_Encoder& encoder, const ASN1_String& string)
{
DER::encode(encoder, string, string.tagging(), UNIVERSAL);
}
}
namespace BER {
namespace {
/*************************************************
* Do any UTF-8/Unicode decoding needed *
*************************************************/
std::string convert_string(BER_Object obj, ASN1_Tag type)
{
if(type == BMP_STRING)
{
if(obj.value.size() % 2 == 1)
throw BER_Decoding_Error("BMP STRING has an odd number of bytes");
std::string value;
for(u32bit j = 0; j != obj.value.size(); j += 2)
{
const byte c1 = obj.value[j];
const byte c2 = obj.value[j+1];
if(c1 != 0)
throw BER_Decoding_Error("BMP STRING has non-Latin1 characters");
value += (char)c2;
}
return iso2local(value);
}
else if(type == UTF8_STRING)
return iso2local(utf2iso(BER::to_string(obj)));
else
return iso2local(BER::to_string(obj));
}
}
/*************************************************
* Decode a BER encoded ASN1_String *
*************************************************/
void decode(BER_Decoder& source, ASN1_String& string,
ASN1_Tag expected_tag, ASN1_Tag real_tag)
{
BER_Object obj = source.get_next_object();
if(obj.type_tag != expected_tag)
throw BER_Bad_Tag("Unexpected string tag", obj.type_tag);
string = ASN1_String(convert_string(obj, real_tag), real_tag);
}
/*************************************************
* Decode a BER encoded ASN1_String *
*************************************************/
void decode(BER_Decoder& source, ASN1_String& string)
{
BER_Object obj = source.get_next_object();
string = ASN1_String(convert_string(obj, obj.type_tag), obj.type_tag);
}
}
}
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