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/*************************************************
* Nyberg-Rueppel Source File *
* (C) 1999-2007 Jack Lloyd *
*************************************************/
#include <botan/nr.h>
#include <botan/numthry.h>
#include <botan/keypair.h>
namespace Botan {
/*************************************************
* NR_PublicKey Constructor *
*************************************************/
NR_PublicKey::NR_PublicKey(const DL_Group& grp, const BigInt& y1)
{
group = grp;
y = y1;
X509_load_hook();
}
/*************************************************
* Algorithm Specific X.509 Initialization Code *
*************************************************/
void NR_PublicKey::X509_load_hook()
{
core = NR_Core(group, y);
}
/*************************************************
* Nyberg-Rueppel Verification Function *
*************************************************/
SecureVector<byte> NR_PublicKey::verify(const byte sig[], u32bit sig_len) const
{
return core.verify(sig, sig_len);
}
/*************************************************
* Return the maximum input size in bits *
*************************************************/
u32bit NR_PublicKey::max_input_bits() const
{
return (group_q().bits() - 1);
}
/*************************************************
* Return the size of each portion of the sig *
*************************************************/
u32bit NR_PublicKey::message_part_size() const
{
return group_q().bytes();
}
/*************************************************
* Create a NR private key *
*************************************************/
NR_PrivateKey::NR_PrivateKey(RandomNumberGenerator& rng,
const DL_Group& grp,
const BigInt& x_arg)
{
group = grp;
x = x_arg;
if(x == 0)
{
x = BigInt::random_integer(rng, 2, group_q() - 1);
PKCS8_load_hook(rng, true);
}
else
PKCS8_load_hook(rng, false);
}
/*************************************************
* Algorithm Specific PKCS #8 Initialization Code *
*************************************************/
void NR_PrivateKey::PKCS8_load_hook(RandomNumberGenerator& rng,
bool generated)
{
if(y == 0)
y = power_mod(group_g(), x, group_p());
core = NR_Core(group, y, x);
if(generated)
gen_check(rng);
else
load_check(rng);
}
/*************************************************
* Nyberg-Rueppel Signature Operation *
*************************************************/
SecureVector<byte> NR_PrivateKey::sign(const byte in[], u32bit length,
RandomNumberGenerator& rng) const
{
const BigInt& q = group_q();
BigInt k;
do
k.randomize(rng, q.bits());
while(k >= q);
return core.sign(in, length, k);
}
/*************************************************
* Check Private Nyberg-Rueppel Parameters *
*************************************************/
bool NR_PrivateKey::check_key(RandomNumberGenerator& rng, bool strong) const
{
if(!DL_Scheme_PrivateKey::check_key(rng, strong) || x >= group_q())
return false;
if(!strong)
return true;
try
{
KeyPair::check_key(rng,
get_pk_signer(*this, "EMSA1(SHA-1)"),
get_pk_verifier(*this, "EMSA1(SHA-1)")
);
}
catch(Self_Test_Failure)
{
return false;
}
return true;
}
}
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