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/*
* IF Scheme
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/if_algo.h>
#include <botan/numthry.h>
#include <botan/internal/workfactor.h>
#include <botan/der_enc.h>
#include <botan/ber_dec.h>
namespace Botan {
size_t IF_Scheme_PublicKey::estimated_strength() const
{
return dl_work_factor(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(n)
.encode(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(n)
.decode(e)
.verify_end()
.end_cons();
}
/*
* Check IF Scheme Public Parameters
*/
bool IF_Scheme_PublicKey::check_key(RandomNumberGenerator&, bool) const
{
if(n < 35 || n.is_even() || 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(n)
.encode(e)
.encode(d)
.encode(p)
.encode(q)
.encode(d1)
.encode(d2)
.encode(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(n)
.decode(e)
.decode(d)
.decode(p)
.decode(q)
.decode(d1)
.decode(d2)
.decode(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)
{
p = prime1;
q = prime2;
e = exp;
d = d_exp;
n = mod.is_nonzero() ? mod : p * q;
if(d == 0)
{
BigInt inv_for_d = lcm(p - 1, q - 1);
if(e.is_even())
inv_for_d >>= 1;
d = inverse_mod(e, inv_for_d);
}
d1 = d % (p - 1);
d2 = d % (q - 1);
c = inverse_mod(q, p);
load_check(rng);
}
/*
* Check IF Scheme Private Parameters
*/
bool IF_Scheme_PrivateKey::check_key(RandomNumberGenerator& rng,
bool strong) const
{
if(n < 35 || n.is_even() || e < 2 || d < 2 || p < 3 || q < 3 || p*q != n)
return false;
if(!strong)
return true;
if(d1 != d % (p - 1) || d2 != d % (q - 1) || c != inverse_mod(q, p))
return false;
if(!check_prime(p, rng) || !check_prime(q, rng))
return false;
return true;
}
}
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