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/*
* PKCS#11 ECC
* (C) 2016 Daniel Neus, Sirrix AG
* (C) 2016 Philipp Weber, Sirrix AG
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/p11_ecc_key.h>
#if defined(BOTAN_HAS_ECC_PUBLIC_KEY_CRYPTO)
#include <botan/workfactor.h>
#include <botan/ber_dec.h>
namespace Botan {
namespace PKCS11 {
namespace {
/// Converts a DER-encoded ANSI X9.62 ECPoint to PointGFp
PointGFp decode_public_point(const secure_vector<uint8_t>& ec_point_data, const CurveGFp& curve)
{
secure_vector<uint8_t> ec_point;
BER_Decoder(ec_point_data).decode(ec_point, OCTET_STRING);
return OS2ECP(ec_point, curve);
}
}
EC_PublicKeyGenerationProperties::EC_PublicKeyGenerationProperties(const std::vector<uint8_t>& ec_params)
: PublicKeyProperties(KeyType::Ec), m_ec_params(ec_params)
{
add_binary(AttributeType::EcParams, m_ec_params);
}
EC_PublicKeyImportProperties::EC_PublicKeyImportProperties(const std::vector<uint8_t>& ec_params,
const std::vector<uint8_t>& ec_point)
: PublicKeyProperties(KeyType::Ec), m_ec_params(ec_params), m_ec_point(ec_point)
{
add_binary(AttributeType::EcParams, m_ec_params);
add_binary(AttributeType::EcPoint, m_ec_point);
}
PKCS11_EC_PublicKey::PKCS11_EC_PublicKey(Session& session, ObjectHandle handle)
: Object(session, handle)
{
secure_vector<uint8_t> ec_parameters = get_attribute_value(AttributeType::EcParams);
m_domain_params = EC_Group(unlock(ec_parameters));
m_public_key = decode_public_point(get_attribute_value(AttributeType::EcPoint), m_domain_params.get_curve());
m_domain_encoding = EC_DOMPAR_ENC_EXPLICIT;
}
PKCS11_EC_PublicKey::PKCS11_EC_PublicKey(Session& session, const EC_PublicKeyImportProperties& props)
: Object(session, props)
{
m_domain_params = EC_Group(props.ec_params());
secure_vector<uint8_t> ec_point;
BER_Decoder(props.ec_point()).decode(ec_point, OCTET_STRING);
m_public_key = OS2ECP(ec_point, m_domain_params.get_curve());
m_domain_encoding = EC_DOMPAR_ENC_EXPLICIT;
}
EC_PrivateKeyImportProperties::EC_PrivateKeyImportProperties(const std::vector<uint8_t>& ec_params, const BigInt& value)
: PrivateKeyProperties(KeyType::Ec), m_ec_params(ec_params), m_value(value)
{
add_binary(AttributeType::EcParams, m_ec_params);
add_binary(AttributeType::Value, BigInt::encode(m_value));
}
PKCS11_EC_PrivateKey::PKCS11_EC_PrivateKey(Session& session, ObjectHandle handle)
: Object(session, handle), m_domain_params(), m_public_key()
{
secure_vector<uint8_t> ec_parameters = get_attribute_value(AttributeType::EcParams);
m_domain_params = EC_Group(unlock(ec_parameters));
}
PKCS11_EC_PrivateKey::PKCS11_EC_PrivateKey(Session& session, const EC_PrivateKeyImportProperties& props)
: Object(session, props)
{
m_domain_params = EC_Group(props.ec_params());
}
PKCS11_EC_PrivateKey::PKCS11_EC_PrivateKey(Session& session, const std::vector<uint8_t>& ec_params,
const EC_PrivateKeyGenerationProperties& props)
: Object(session)
{
m_domain_params = EC_Group(ec_params);
EC_PublicKeyGenerationProperties pub_key_props(ec_params);
pub_key_props.set_verify(true);
pub_key_props.set_private(false);
pub_key_props.set_token(false); // don't create a persistent public key object
ObjectHandle pub_key_handle = 0;
m_handle = 0;
Mechanism mechanism = { CKM_EC_KEY_PAIR_GEN, nullptr, 0 };
session.module()->C_GenerateKeyPair(session.handle(), &mechanism,
pub_key_props.data(), pub_key_props.count(), props.data(), props.count(),
&pub_key_handle, &m_handle);
Object public_key(session, pub_key_handle);
m_public_key = decode_public_point(public_key.get_attribute_value(AttributeType::EcPoint), m_domain_params.get_curve());
}
size_t PKCS11_EC_PrivateKey::key_length() const
{
return m_domain_params.get_order().bits();
}
std::vector<uint8_t> PKCS11_EC_PrivateKey::public_key_bits() const
{
return unlock(EC2OSP(public_point(), PointGFp::COMPRESSED));
}
size_t PKCS11_EC_PrivateKey::estimated_strength() const
{
return ecp_work_factor(key_length());
}
bool PKCS11_EC_PrivateKey::check_key(RandomNumberGenerator&, bool) const
{
return m_public_key.on_the_curve();
}
AlgorithmIdentifier PKCS11_EC_PrivateKey::algorithm_identifier() const
{
return AlgorithmIdentifier(get_oid(), domain().DER_encode(EC_DOMPAR_ENC_EXPLICIT));
}
}
}
#endif
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