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/*
* Algorithm Identifier
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/alg_id.h>
#include <botan/der_enc.h>
#include <botan/ber_dec.h>
#include <botan/oids.h>
namespace Botan {
/*
* Create an AlgorithmIdentifier
*/
AlgorithmIdentifier::AlgorithmIdentifier(const OID& alg_id,
const std::vector<uint8_t>& param) :
oid(alg_id),
parameters(param)
{}
/*
* Create an AlgorithmIdentifier
*/
AlgorithmIdentifier::AlgorithmIdentifier(const std::string& alg_id,
const std::vector<uint8_t>& param) :
oid(OIDS::lookup(alg_id)),
parameters(param)
{}
/*
* Create an AlgorithmIdentifier
*/
AlgorithmIdentifier::AlgorithmIdentifier(const OID& alg_id,
Encoding_Option option) :
oid(alg_id),
parameters()
{
const uint8_t DER_NULL[] = { 0x05, 0x00 };
if(option == USE_NULL_PARAM)
parameters.assign(DER_NULL, DER_NULL + 2);
}
/*
* Create an AlgorithmIdentifier
*/
AlgorithmIdentifier::AlgorithmIdentifier(const std::string& alg_id,
Encoding_Option option) :
oid(OIDS::lookup(alg_id)),
parameters()
{
const uint8_t DER_NULL[] = { 0x05, 0x00 };
if(option == USE_NULL_PARAM)
parameters.assign(DER_NULL, DER_NULL + 2);
}
/*
* Compare two AlgorithmIdentifiers
*/
namespace {
bool param_null_or_empty(const std::vector<uint8_t>& p)
{
if(p.size() == 2 && (p[0] == 0x05) && (p[1] == 0x00))
return true;
return p.empty();
}
}
bool operator==(const AlgorithmIdentifier& a1, const AlgorithmIdentifier& a2)
{
if(a1.get_oid() != a2.get_oid())
return false;
if(param_null_or_empty(a1.get_parameters()) &&
param_null_or_empty(a2.get_parameters()))
return true;
return (a1.get_parameters() == a2.get_parameters());
}
/*
* Compare two AlgorithmIdentifiers
*/
bool operator!=(const AlgorithmIdentifier& a1, const AlgorithmIdentifier& a2)
{
return !(a1 == a2);
}
/*
* DER encode an AlgorithmIdentifier
*/
void AlgorithmIdentifier::encode_into(DER_Encoder& codec) const
{
codec.start_cons(SEQUENCE)
.encode(get_oid())
.raw_bytes(get_parameters())
.end_cons();
}
/*
* Decode a BER encoded AlgorithmIdentifier
*/
void AlgorithmIdentifier::decode_from(BER_Decoder& codec)
{
codec.start_cons(SEQUENCE)
.decode(oid)
.raw_bytes(parameters)
.end_cons();
}
}
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