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/*
* ASN.1 OID
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/asn1_obj.h>
#include <botan/der_enc.h>
#include <botan/ber_dec.h>
#include <botan/internal/bit_ops.h>
#include <botan/internal/parsing.h>
#include <botan/oids.h>
#include <algorithm>
#include <sstream>
namespace Botan {
namespace {
// returns empty on invalid
std::vector<uint32_t> parse_oid_str(const std::string& oid)
{
try
{
std::string elem;
std::vector<uint32_t> oid_elems;
for(char c : oid)
{
if(c == '.')
{
if(elem.empty())
return std::vector<uint32_t>();
oid_elems.push_back(to_u32bit(elem));
elem.clear();
}
else
{
elem += c;
}
}
if(elem.empty())
return std::vector<uint32_t>();
oid_elems.push_back(to_u32bit(elem));
if(oid_elems.size() < 2)
return std::vector<uint32_t>();
return oid_elems;
}
catch(Invalid_Argument&) // thrown by to_u32bit
{
return std::vector<uint32_t>();
}
}
}
//static
OID OID::from_string(const std::string& str)
{
if(str.empty())
throw Invalid_Argument("OID::from_string argument must be non-empty");
const OID o = OIDS::str2oid_or_empty(str);
if(o.has_value())
return o;
std::vector<uint32_t> raw = parse_oid_str(str);
if(raw.size() > 0)
return OID(std::move(raw));
throw Lookup_Error("No OID associated with name " + str);
}
/*
* ASN.1 OID Constructor
*/
OID::OID(const std::string& oid_str)
{
if(!oid_str.empty())
{
m_id = parse_oid_str(oid_str);
if(m_id.size() < 2 || m_id[0] > 2)
throw Invalid_OID(oid_str);
if((m_id[0] == 0 || m_id[0] == 1) && m_id[1] > 39)
throw Invalid_OID(oid_str);
}
}
/*
* Return this OID as a string
*/
std::string OID::to_string() const
{
std::ostringstream oss;
for(size_t i = 0; i != m_id.size(); ++i)
{
oss << m_id[i];
if(i != m_id.size() - 1)
oss << ".";
}
return oss.str();
}
std::string OID::to_formatted_string() const
{
const std::string s = OIDS::oid2str_or_empty(*this);
if(!s.empty())
return s;
return this->to_string();
}
/*
* Append another component to the OID
*/
OID operator+(const OID& oid, uint32_t new_component)
{
std::vector<uint32_t> val = oid.get_components();
val.push_back(new_component);
return OID(std::move(val));
}
/*
* Compare two OIDs
*/
bool operator<(const OID& a, const OID& b)
{
const std::vector<uint32_t>& oid1 = a.get_components();
const std::vector<uint32_t>& oid2 = b.get_components();
return std::lexicographical_compare(oid1.begin(), oid1.end(),
oid2.begin(), oid2.end());
}
/*
* DER encode an OBJECT IDENTIFIER
*/
void OID::encode_into(DER_Encoder& der) const
{
if(m_id.size() < 2)
throw Invalid_Argument("OID::encode_into: OID is invalid");
std::vector<uint8_t> encoding;
if(m_id[0] > 2 || m_id[1] >= 40)
throw Encoding_Error("Invalid OID prefix, cannot encode");
encoding.push_back(static_cast<uint8_t>(40 * m_id[0] + m_id[1]));
for(size_t i = 2; i != m_id.size(); ++i)
{
if(m_id[i] == 0)
encoding.push_back(0);
else
{
size_t blocks = high_bit(m_id[i]) + 6;
blocks = (blocks - (blocks % 7)) / 7;
BOTAN_ASSERT(blocks > 0, "Math works");
for(size_t j = 0; j != blocks - 1; ++j)
encoding.push_back(0x80 | ((m_id[i] >> 7*(blocks-j-1)) & 0x7F));
encoding.push_back(m_id[i] & 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.tagging() != OBJECT_ID)
throw BER_Bad_Tag("Error decoding OID, unknown tag", obj.tagging());
const size_t length = obj.length();
const uint8_t* bits = obj.bits();
if(length < 2 && !(length == 1 && bits[0] == 0))
{
throw BER_Decoding_Error("OID encoding is too short");
}
m_id.clear();
m_id.push_back(bits[0] / 40);
m_id.push_back(bits[0] % 40);
size_t i = 0;
while(i != length - 1)
{
uint32_t component = 0;
while(i != length - 1)
{
++i;
if(component >> (32-7))
throw Decoding_Error("OID component overflow");
component = (component << 7) + (bits[i] & 0x7F);
if(!(bits[i] & 0x80))
break;
}
m_id.push_back(component);
}
}
}
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