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/*
* ASN.1 OID
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/asn1_oid.h>
#include <botan/der_enc.h>
#include <botan/ber_dec.h>
#include <botan/bit_ops.h>
#include <botan/parsing.h>
namespace Botan {
/*
* ASN.1 OID Constructor
*/
OID::OID(const std::string& oid_str)
{
if(oid_str != "")
{
id = parse_asn1_oid(oid_str);
if(id.size() < 2 || id[0] > 2)
throw Invalid_OID(oid_str);
if((id[0] == 0 || id[0] == 1) && id[1] > 39)
throw Invalid_OID(oid_str);
}
}
/*
* Clear the current OID
*/
void OID::clear()
{
id.clear();
}
/*
* Return this OID as a string
*/
std::string OID::as_string() const
{
std::string oid_str;
for(u32bit j = 0; j != id.size(); ++j)
{
oid_str += to_string(id[j]);
if(j != id.size() - 1)
oid_str += '.';
}
return oid_str;
}
/*
* OID equality comparison
*/
bool OID::operator==(const OID& oid) const
{
if(id.size() != oid.id.size())
return false;
for(u32bit j = 0; j != id.size(); ++j)
if(id[j] != oid.id[j])
return false;
return true;
}
/*
* Append another component to the OID
*/
OID& OID::operator+=(u32bit component)
{
id.push_back(component);
return (*this);
}
/*
* Append another component to the OID
*/
OID operator+(const OID& oid, u32bit component)
{
OID new_oid(oid);
new_oid += component;
return new_oid;
}
/*
* OID inequality comparison
*/
bool operator!=(const OID& a, const OID& b)
{
return !(a == b);
}
/*
* Compare two OIDs
*/
bool operator<(const OID& a, const OID& b)
{
std::vector<u32bit> oid1 = a.get_id();
std::vector<u32bit> oid2 = b.get_id();
if(oid1.size() < oid2.size())
return true;
if(oid1.size() > oid2.size())
return false;
for(u32bit j = 0; j != oid1.size(); ++j)
{
if(oid1[j] < oid2[j])
return true;
if(oid1[j] > oid2[j])
return false;
}
return false;
}
/*
* DER encode an OBJECT IDENTIFIER
*/
void OID::encode_into(DER_Encoder& der) const
{
if(id.size() < 2)
throw Invalid_Argument("OID::encode_into: OID is invalid");
MemoryVector<byte> encoding;
encoding.append(40 * id[0] + id[1]);
for(u32bit j = 2; j != id.size(); ++j)
{
if(id[j] == 0)
encoding.append(0);
else
{
u32bit blocks = high_bit(id[j]) + 6;
blocks = (blocks - (blocks % 7)) / 7;
for(u32bit k = 0; k != blocks - 1; ++k)
encoding.append(0x80 | ((id[j] >> 7*(blocks-k-1)) & 0x7F));
encoding.append(id[j] & 0x7F);
}
}
der.add_object(OBJECT_ID, UNIVERSAL, encoding);
}
/*
* Decode a BER encoded OBJECT IDENTIFIER
*/
void OID::decode_from(BER_Decoder& decoder)
{
BER_Object obj = decoder.get_next_object();
if(obj.type_tag != OBJECT_ID || obj.class_tag != UNIVERSAL)
throw BER_Bad_Tag("Error decoding OID, unknown tag",
obj.type_tag, obj.class_tag);
if(obj.value.size() < 2)
throw BER_Decoding_Error("OID encoding is too short");
clear();
id.push_back(obj.value[0] / 40);
id.push_back(obj.value[0] % 40);
u32bit j = 0;
while(j != obj.value.size() - 1)
{
u32bit component = 0;
while(j != obj.value.size() - 1)
{
++j;
component = (component << 7) + (obj.value[j] & 0x7F);
if(!(obj.value[j] & 0x80))
break;
}
id.push_back(component);
}
}
}
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