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/*
* IF Scheme
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/if_algo.h>
#include <botan/numthry.h>
#include <botan/workfactor.h>
#include <botan/der_enc.h>
#include <botan/ber_dec.h>
namespace Botan {
size_t IF_Scheme_PublicKey::estimated_strength() const
{
return if_work_factor(m_n.bits());
}
AlgorithmIdentifier IF_Scheme_PublicKey::algorithm_identifier() const
{
return AlgorithmIdentifier(get_oid(),
AlgorithmIdentifier::USE_NULL_PARAM);
}
std::vector<byte> IF_Scheme_PublicKey::x509_subject_public_key() const
{
return DER_Encoder()
.start_cons(SEQUENCE)
.encode(m_n)
.encode(m_e)
.end_cons()
.get_contents_unlocked();
}
IF_Scheme_PublicKey::IF_Scheme_PublicKey(const AlgorithmIdentifier&,
const secure_vector<byte>& key_bits)
{
BER_Decoder(key_bits)
.start_cons(SEQUENCE)
.decode(m_n)
.decode(m_e)
.verify_end()
.end_cons();
}
/*
* Check IF Scheme Public Parameters
*/
bool IF_Scheme_PublicKey::check_key(RandomNumberGenerator&, bool) const
{
if(m_n < 35 || m_n.is_even() || m_e < 2)
return false;
return true;
}
secure_vector<byte> IF_Scheme_PrivateKey::pkcs8_private_key() const
{
return DER_Encoder()
.start_cons(SEQUENCE)
.encode(static_cast<size_t>(0))
.encode(m_n)
.encode(m_e)
.encode(m_d)
.encode(m_p)
.encode(m_q)
.encode(m_d1)
.encode(m_d2)
.encode(m_c)
.end_cons()
.get_contents();
}
IF_Scheme_PrivateKey::IF_Scheme_PrivateKey(RandomNumberGenerator& rng,
const AlgorithmIdentifier&,
const secure_vector<byte>& key_bits)
{
BER_Decoder(key_bits)
.start_cons(SEQUENCE)
.decode_and_check<size_t>(0, "Unknown PKCS #1 key format version")
.decode(m_n)
.decode(m_e)
.decode(m_d)
.decode(m_p)
.decode(m_q)
.decode(m_d1)
.decode(m_d2)
.decode(m_c)
.end_cons();
load_check(rng);
}
IF_Scheme_PrivateKey::IF_Scheme_PrivateKey(RandomNumberGenerator& rng,
const BigInt& prime1,
const BigInt& prime2,
const BigInt& exp,
const BigInt& d_exp,
const BigInt& mod) :
m_d{ d_exp }, m_p{ prime1 }, m_q{ prime2 }, m_d1{}, m_d2{}, m_c{ inverse_mod( m_q, m_p ) }
{
m_n = mod.is_nonzero() ? mod : m_p * m_q;
m_e = exp;
if(m_d == 0)
{
BigInt inv_for_d = lcm(m_p - 1, m_q - 1);
if(m_e.is_even())
inv_for_d >>= 1;
m_d = inverse_mod(m_e, inv_for_d);
}
m_d1 = m_d % (m_p - 1);
m_d2 = m_d % (m_q - 1);
load_check(rng);
}
/*
* Check IF Scheme Private Parameters
*/
bool IF_Scheme_PrivateKey::check_key(RandomNumberGenerator& rng,
bool strong) const
{
if(m_n < 35 || m_n.is_even() || m_e < 2 || m_d < 2 || m_p < 3 || m_q < 3 || m_p*m_q != m_n)
return false;
if(m_d1 != m_d % (m_p - 1) || m_d2 != m_d % (m_q - 1) || m_c != inverse_mod(m_q, m_p))
return false;
const size_t prob = (strong) ? 56 : 12;
if(!is_prime(m_p, rng, prob) || !is_prime(m_q, rng, prob))
return false;
return true;
}
}
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