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/*************************************************
* IF Scheme Source File *
* (C) 1999-2005 The Botan Project *
*************************************************/
#include <botan/if_algo.h>
#include <botan/numthry.h>
#include <botan/asn1.h>
namespace Botan {
/*************************************************
* Return the X.509 public key encoding *
*************************************************/
MemoryVector<byte> IF_Scheme_PublicKey::DER_encode_pub() const
{
DER_Encoder encoder;
encoder.start_sequence();
DER::encode(encoder, n);
DER::encode(encoder, e);
encoder.end_sequence();
return encoder.get_contents();
}
/*************************************************
* Return the X.509 parameters encoding *
*************************************************/
MemoryVector<byte> IF_Scheme_PublicKey::DER_encode_params() const
{
DER_Encoder encoder;
DER::encode_null(encoder);
return encoder.get_contents();
}
/*************************************************
* Decode X.509 public key encoding *
*************************************************/
void IF_Scheme_PublicKey::BER_decode_pub(DataSource& source)
{
BER_Decoder decoder(source);
BER_Decoder sequence = BER::get_subsequence(decoder);
BER::decode(sequence, n);
BER::decode(sequence, e);
sequence.verify_end();
X509_load_hook();
}
/*************************************************
* Decode X.509 algorithm parameters *
*************************************************/
void IF_Scheme_PublicKey::BER_decode_params(DataSource& source)
{
byte dummy = 0;
while(!source.end_of_data())
source.read_byte(dummy);
}
/*************************************************
* Return the PKCS #1 private key encoding *
*************************************************/
SecureVector<byte> IF_Scheme_PrivateKey::DER_encode_priv() const
{
DER_Encoder encoder;
encoder.start_sequence();
DER::encode(encoder, 0);
DER::encode(encoder, n);
DER::encode(encoder, e);
DER::encode(encoder, d);
DER::encode(encoder, p);
DER::encode(encoder, q);
DER::encode(encoder, d1);
DER::encode(encoder, d2);
DER::encode(encoder, c);
encoder.end_sequence();
return encoder.get_contents();
}
/*************************************************
* Decode a PKCS #1 private key encoding *
*************************************************/
void IF_Scheme_PrivateKey::BER_decode_priv(DataSource& source)
{
u32bit version;
BER_Decoder decoder(source);
BER_Decoder sequence = BER::get_subsequence(decoder);
BER::decode(sequence, version);
if(version != 0)
throw Decoding_Error(algo_name() + ": Unknown PKCS #1 key version");
BER::decode(sequence, n);
BER::decode(sequence, e);
BER::decode(sequence, d);
BER::decode(sequence, p);
BER::decode(sequence, q);
BER::decode(sequence, d1);
BER::decode(sequence, d2);
BER::decode(sequence, c);
sequence.verify_end();
PKCS8_load_hook();
check_loaded_private();
}
/*************************************************
* Algorithm Specific X.509 Initialization Code *
*************************************************/
void IF_Scheme_PublicKey::X509_load_hook()
{
core = IF_Core(e, n);
check_loaded_public();
}
/*************************************************
* Algorithm Specific PKCS #8 Initialization Code *
*************************************************/
void IF_Scheme_PrivateKey::PKCS8_load_hook()
{
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(e, n, d, p, q, d1, d2, c);
}
/*************************************************
* Check IF Scheme Public Parameters *
*************************************************/
bool IF_Scheme_PublicKey::check_key(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(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) || !check_prime(q))
return false;
return true;
}
}
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