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/*************************************************
* DL Scheme Source File *
* (C) 1999-2007 Jack Lloyd *
*************************************************/
#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_Scheme_Encoder : public X509_Encoder
{
public:
AlgorithmIdentifier alg_id() const
{
MemoryVector<byte> group =
key->group.DER_encode(key->group_format());
return AlgorithmIdentifier(key->get_oid(), group);
}
MemoryVector<byte> key_bits() const
{
return DER_Encoder().encode(key->y).get_contents();
}
DL_Scheme_Encoder(const DL_Scheme_PublicKey* k) : key(k) {}
private:
const DL_Scheme_PublicKey* key;
};
return new DL_Scheme_Encoder(this);
}
/*************************************************
* Return the X.509 public key decoder *
*************************************************/
X509_Decoder* DL_Scheme_PublicKey::x509_decoder()
{
class DL_Scheme_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_Scheme_Decoder(DL_Scheme_PublicKey* k) : key(k) {}
private:
DL_Scheme_PublicKey* key;
};
return new DL_Scheme_Decoder(this);
}
/*************************************************
* Return the PKCS #8 private key encoder *
*************************************************/
PKCS8_Encoder* DL_Scheme_PrivateKey::pkcs8_encoder() const
{
class DL_Scheme_Encoder : public PKCS8_Encoder
{
public:
AlgorithmIdentifier alg_id() const
{
MemoryVector<byte> group =
key->group.DER_encode(key->group_format());
return AlgorithmIdentifier(key->get_oid(), group);
}
MemoryVector<byte> key_bits() const
{
return DER_Encoder().encode(key->x).get_contents();
}
DL_Scheme_Encoder(const DL_Scheme_PrivateKey* k) : key(k) {}
private:
const DL_Scheme_PrivateKey* key;
};
return new DL_Scheme_Encoder(this);
}
/*************************************************
* Return the PKCS #8 private key decoder *
*************************************************/
PKCS8_Decoder* DL_Scheme_PrivateKey::pkcs8_decoder()
{
class DL_Scheme_Decoder : public PKCS8_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->x);
key->PKCS8_load_hook();
}
DL_Scheme_Decoder(DL_Scheme_PrivateKey* k) : key(k) {}
private:
DL_Scheme_PrivateKey* key;
};
return new DL_Scheme_Decoder(this);
}
/*************************************************
* Check Public DL Parameters *
*************************************************/
bool DL_Scheme_PublicKey::check_key(RandomNumberGenerator& rng,
bool strong) const
{
if(y < 2 || y >= group_p())
return false;
if(!group.verify_group(rng, strong))
return false;
return true;
}
/*************************************************
* Check DL Scheme Private Parameters *
*************************************************/
bool DL_Scheme_PrivateKey::check_key(RandomNumberGenerator& rng,
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(rng, strong))
return false;
if(!strong)
return true;
if(y != power_mod(g, x, p))
return false;
return true;
}
}
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