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/*
* PKCS#11 ECDSA
* (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_ecdsa.h>
#if defined(BOTAN_HAS_ECDSA)
#include <botan/internal/p11_mechanism.h>
#include <botan/pk_ops.h>
#include <botan/keypair.h>
#include <botan/rng.h>
namespace Botan {
namespace PKCS11 {
ECDSA_PublicKey PKCS11_ECDSA_PublicKey::export_key() const
{
return ECDSA_PublicKey(domain(), public_point());
}
bool PKCS11_ECDSA_PrivateKey::check_key(RandomNumberGenerator& rng, bool strong) const
{
if(!public_point().on_the_curve())
{
return false;
}
if(!strong)
{
return true;
}
ECDSA_PublicKey pubkey(domain(), public_point());
return KeyPair::signature_consistency_check(rng, *this, pubkey, "EMSA1(SHA-256)");
}
ECDSA_PrivateKey PKCS11_ECDSA_PrivateKey::export_key() const
{
auto priv_key = get_attribute_value(AttributeType::Value);
Null_RNG rng;
return ECDSA_PrivateKey(rng, domain(), BigInt::decode(priv_key));
}
secure_vector<uint8_t> PKCS11_ECDSA_PrivateKey::private_key_bits() const
{
return export_key().private_key_bits();
}
namespace {
class PKCS11_ECDSA_Signature_Operation final : public PK_Ops::Signature
{
public:
PKCS11_ECDSA_Signature_Operation(const PKCS11_EC_PrivateKey& key, const std::string& emsa)
: PK_Ops::Signature(), m_key(key), m_order(key.domain().get_order()), m_mechanism(MechanismWrapper::create_ecdsa_mechanism(emsa))
{}
void update(const uint8_t msg[], size_t msg_len) override
{
if(!m_initialized)
{
// first call to update: initialize and cache message because we can not determine yet whether a single- or multiple-part operation will be performed
m_key.module()->C_SignInit(m_key.session().handle(), m_mechanism.data(), m_key.handle());
m_initialized = true;
m_first_message = secure_vector<uint8_t>(msg, msg + msg_len);
return;
}
if(!m_first_message.empty())
{
// second call to update: start multiple-part operation
m_key.module()->C_SignUpdate(m_key.session().handle(), m_first_message);
m_first_message.clear();
}
m_key.module()->C_SignUpdate(m_key.session().handle(), const_cast<Byte*>(msg), static_cast<Ulong>(msg_len));
}
secure_vector<uint8_t> sign(RandomNumberGenerator&) override
{
secure_vector<uint8_t> signature;
if(!m_first_message.empty())
{
// single call to update: perform single-part operation
m_key.module()->C_Sign(m_key.session().handle(), m_first_message, signature);
m_first_message.clear();
}
else
{
// multiple calls to update (or none): finish multiple-part operation
m_key.module()->C_SignFinal(m_key.session().handle(), signature);
}
m_initialized = false;
return signature;
}
size_t signature_length() const override { return 2*m_order.bytes(); }
private:
const PKCS11_EC_PrivateKey& m_key;
const BigInt& m_order;
MechanismWrapper m_mechanism;
secure_vector<uint8_t> m_first_message;
bool m_initialized = false;
};
class PKCS11_ECDSA_Verification_Operation final : public PK_Ops::Verification
{
public:
PKCS11_ECDSA_Verification_Operation(const PKCS11_EC_PublicKey& key, const std::string& emsa)
: PK_Ops::Verification(), m_key(key), m_order(key.domain().get_order()), m_mechanism(MechanismWrapper::create_ecdsa_mechanism(emsa))
{}
void update(const uint8_t msg[], size_t msg_len) override
{
if(!m_initialized)
{
// first call to update: initialize and cache message because we can not determine yet whether a single- or multiple-part operation will be performed
m_key.module()->C_VerifyInit(m_key.session().handle(), m_mechanism.data(), m_key.handle());
m_initialized = true;
m_first_message = secure_vector<uint8_t>(msg, msg + msg_len);
return;
}
if(!m_first_message.empty())
{
// second call to update: start multiple-part operation
m_key.module()->C_VerifyUpdate(m_key.session().handle(), m_first_message);
m_first_message.clear();
}
m_key.module()->C_VerifyUpdate(m_key.session().handle(), const_cast<Byte*>(msg), static_cast<Ulong>(msg_len));
}
bool is_valid_signature(const uint8_t sig[], size_t sig_len) override
{
ReturnValue return_value = ReturnValue::SignatureInvalid;
if(!m_first_message.empty())
{
// single call to update: perform single-part operation
m_key.module()->C_Verify(m_key.session().handle(),
m_first_message.data(), static_cast<Ulong>(m_first_message.size()),
const_cast<Byte*>(sig), static_cast<Ulong>(sig_len),
&return_value);
m_first_message.clear();
}
else
{
// multiple calls to update (or none): finish multiple-part operation
m_key.module()->C_VerifyFinal(m_key.session().handle(), const_cast<Byte*>(sig), static_cast<Ulong>(sig_len), &return_value);
}
m_initialized = false;
if(return_value != ReturnValue::OK && return_value != ReturnValue::SignatureInvalid)
{
throw PKCS11_ReturnError(return_value);
}
return return_value == ReturnValue::OK;
}
private:
const PKCS11_EC_PublicKey& m_key;
const BigInt& m_order;
MechanismWrapper m_mechanism;
secure_vector<uint8_t> m_first_message;
bool m_initialized = false;
};
}
std::unique_ptr<PK_Ops::Verification>
PKCS11_ECDSA_PublicKey::create_verification_op(const std::string& params,
const std::string& /*provider*/) const
{
return std::unique_ptr<PK_Ops::Verification>(new PKCS11_ECDSA_Verification_Operation(*this, params));
}
std::unique_ptr<PK_Ops::Signature>
PKCS11_ECDSA_PrivateKey::create_signature_op(RandomNumberGenerator& /*rng*/,
const std::string& params,
const std::string& /*provider*/) const
{
return std::unique_ptr<PK_Ops::Signature>(new PKCS11_ECDSA_Signature_Operation(*this, params));
}
PKCS11_ECDSA_KeyPair generate_ecdsa_keypair(Session& session, const EC_PublicKeyGenerationProperties& pub_props,
const EC_PrivateKeyGenerationProperties& priv_props)
{
ObjectHandle pub_key_handle = 0;
ObjectHandle priv_key_handle = 0;
Mechanism mechanism = { static_cast<CK_MECHANISM_TYPE>(MechanismType::EcKeyPairGen), nullptr, 0 };
session.module()->C_GenerateKeyPair(session.handle(), &mechanism,
pub_props.data(), static_cast<Ulong>(pub_props.count()),
priv_props.data(), static_cast<Ulong>(priv_props.count()),
&pub_key_handle, &priv_key_handle);
return std::make_pair(PKCS11_ECDSA_PublicKey(session, pub_key_handle), PKCS11_ECDSA_PrivateKey(session,
priv_key_handle));
}
}
}
#endif
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