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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/der_enc.h>
#include <botan/ber_dec.h>
namespace Botan {
/*
* Return the X.509 public key encoder
*/
X509_Encoder* IF_Scheme_PublicKey::x509_encoder() const
{
class IF_Scheme_Encoder : public X509_Encoder
{
public:
AlgorithmIdentifier alg_id() const
{
return AlgorithmIdentifier(key->get_oid(),
AlgorithmIdentifier::USE_NULL_PARAM);
}
MemoryVector<byte> key_bits() const
{
return DER_Encoder()
.start_cons(SEQUENCE)
.encode(key->n)
.encode(key->e)
.end_cons()
.get_contents();
}
IF_Scheme_Encoder(const IF_Scheme_PublicKey* k) : key(k) {}
private:
const IF_Scheme_PublicKey* key;
};
return new IF_Scheme_Encoder(this);
}
/*
* Return the X.509 public key decoder
*/
X509_Decoder* IF_Scheme_PublicKey::x509_decoder()
{
class IF_Scheme_Decoder : public X509_Decoder
{
public:
void alg_id(const AlgorithmIdentifier&) {}
void key_bits(const MemoryRegion<byte>& bits)
{
BER_Decoder(bits)
.start_cons(SEQUENCE)
.decode(key->n)
.decode(key->e)
.verify_end()
.end_cons();
key->X509_load_hook();
}
IF_Scheme_Decoder(IF_Scheme_PublicKey* k) : key(k) {}
private:
IF_Scheme_PublicKey* key;
};
return new IF_Scheme_Decoder(this);
}
/*
* Return the PKCS #8 public key encoder
*/
PKCS8_Encoder* IF_Scheme_PrivateKey::pkcs8_encoder() const
{
class IF_Scheme_Encoder : public PKCS8_Encoder
{
public:
AlgorithmIdentifier alg_id() const
{
return AlgorithmIdentifier(key->get_oid(),
AlgorithmIdentifier::USE_NULL_PARAM);
}
MemoryVector<byte> key_bits() const
{
return DER_Encoder()
.start_cons(SEQUENCE)
.encode(static_cast<u32bit>(0))
.encode(key->n)
.encode(key->e)
.encode(key->d)
.encode(key->p)
.encode(key->q)
.encode(key->d1)
.encode(key->d2)
.encode(key->c)
.end_cons()
.get_contents();
}
IF_Scheme_Encoder(const IF_Scheme_PrivateKey* k) : key(k) {}
private:
const IF_Scheme_PrivateKey* key;
};
return new IF_Scheme_Encoder(this);
}
/*
* Return the PKCS #8 public key decoder
*/
PKCS8_Decoder* IF_Scheme_PrivateKey::pkcs8_decoder(RandomNumberGenerator& rng)
{
class IF_Scheme_Decoder : public PKCS8_Decoder
{
public:
void alg_id(const AlgorithmIdentifier&) {}
void key_bits(const MemoryRegion<byte>& bits)
{
u32bit version;
BER_Decoder(bits)
.start_cons(SEQUENCE)
.decode(version)
.decode(key->n)
.decode(key->e)
.decode(key->d)
.decode(key->p)
.decode(key->q)
.decode(key->d1)
.decode(key->d2)
.decode(key->c)
.end_cons();
if(version != 0)
throw Decoding_Error("Unknown PKCS #1 key format version");
key->PKCS8_load_hook(rng);
}
IF_Scheme_Decoder(IF_Scheme_PrivateKey* k, RandomNumberGenerator& r) :
key(k), rng(r) {}
private:
IF_Scheme_PrivateKey* key;
RandomNumberGenerator& rng;
};
return new IF_Scheme_Decoder(this, rng);
}
/*
* Algorithm Specific X.509 Initialization Code
*/
void IF_Scheme_PublicKey::X509_load_hook()
{
core = IF_Core(e, n);
}
/*
* Algorithm Specific PKCS #8 Initialization Code
*/
void IF_Scheme_PrivateKey::PKCS8_load_hook(RandomNumberGenerator& rng,
bool generated)
{
if(n == 0) n = p * q;
if(d1 == 0) d1 = d % (p - 1);
if(d2 == 0) d2 = d % (q - 1);
if(c == 0) c = inverse_mod(q, p);
core = IF_Core(rng, e, n, d, p, q, d1, d2, c);
if(generated)
gen_check(rng);
else
load_check(rng);
}
/*
* 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;
}
/*
* 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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