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/*************************************************
* DL Scheme Source File *
* (C) 1999-2006 The Botan Project *
*************************************************/
#include <botan/dl_algo.h>
#include <botan/numthry.h>
#include <botan/der_enc.h>
#include <botan/ber_dec.h>
namespace Botan {
/*************************************************
* Return the X.509 public key encoder *
*************************************************/
X509_Encoder* DL_Scheme_PublicKey::x509_encoder() const
{
class DL_Algo_Encoder : public X509_Encoder
{
public:
AlgorithmIdentifier alg_id() const
{
return AlgorithmIdentifier(oid, group.DER_encode(group_format));
}
MemoryVector<byte> key_bits() const
{
return DER_Encoder().encode(y).get_contents();
}
DL_Algo_Encoder(const OID& oid, const BigInt& y,
const DL_Group& group,
const DL_Group::Format group_format)
{
this->oid = oid;
this->y = y;
this->group = group;
this->group_format = group_format;
}
private:
OID oid;
BigInt y;
DL_Group group;
DL_Group::Format group_format;
};
return new DL_Algo_Encoder(get_oid(), y, group, group_format());
}
/*************************************************
* Return the X.509 public key decoder *
*************************************************/
X509_Decoder* DL_Scheme_PublicKey::x509_decoder()
{
class DL_Algo_Decoder : public X509_Decoder
{
public:
void alg_id(const AlgorithmIdentifier& alg_id)
{
DataSource_Memory source(alg_id.parameters);
key->group.BER_decode(source, key->group_format());
}
void key_bits(const MemoryRegion<byte>& bits)
{
BER_Decoder(bits).decode(key->y);
key->X509_load_hook();
}
DL_Algo_Decoder(DL_Scheme_PublicKey* k) : key(k) {}
private:
DL_Scheme_PublicKey* key;
};
return new DL_Algo_Decoder(this);
}
/*************************************************
* Return the X.509 parameters encoding *
*************************************************/
MemoryVector<byte> DL_Scheme_PrivateKey::DER_encode_params() const
{
return group.DER_encode(group_format());
}
/*************************************************
* Decode X.509 algorithm parameters *
*************************************************/
void DL_Scheme_PrivateKey::BER_decode_params(DataSource& source)
{
group.BER_decode(source, group_format());
}
/*************************************************
* Return the PKCS #8 private key encoding *
*************************************************/
SecureVector<byte> DL_Scheme_PrivateKey::DER_encode_priv() const
{
return DER_Encoder().encode(x).get_contents();
}
/*************************************************
* Decode a PKCS #8 private key encoding *
*************************************************/
void DL_Scheme_PrivateKey::BER_decode_priv(DataSource& source)
{
BER_Decoder(source).decode(x);
PKCS8_load_hook();
check_loaded_private();
}
/*************************************************
* Check Public DL Parameters *
*************************************************/
bool DL_Scheme_PublicKey::check_key(bool strong) const
{
if(y < 2 || y >= group_p())
return false;
if(!group.verify_group(strong))
return false;
return true;
}
/*************************************************
* Check DL Scheme Private Parameters *
*************************************************/
bool DL_Scheme_PrivateKey::check_key(bool strong) const
{
const BigInt& p = group_p();
const BigInt& g = group_g();
if(y < 2 || y >= p || x < 2 || x >= p)
return false;
if(!group.verify_group(strong))
return false;
if(!strong)
return true;
if(y != power_mod(g, x, p))
return false;
return true;
}
}
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