diff options
Diffstat (limited to 'src/lib/prov/pkcs11/p11_ecc_key.cpp')
-rw-r--r-- | src/lib/prov/pkcs11/p11_ecc_key.cpp | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/src/lib/prov/pkcs11/p11_ecc_key.cpp b/src/lib/prov/pkcs11/p11_ecc_key.cpp new file mode 100644 index 000000000..0c3e879d9 --- /dev/null +++ b/src/lib/prov/pkcs11/p11_ecc_key.cpp @@ -0,0 +1,137 @@ +/* +* 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<byte>& ec_point_data, const CurveGFp& curve) + { + secure_vector<byte> ec_point; + BER_Decoder(ec_point_data).decode(ec_point, OCTET_STRING); + return OS2ECP(ec_point, curve); + } +} + +EC_PublicKeyGenerationProperties::EC_PublicKeyGenerationProperties(const std::vector<byte>& ec_params) + : PublicKeyProperties(KeyType::Ec), m_ec_params(ec_params) + { + add_binary(AttributeType::EcParams, m_ec_params); + } + +EC_PublicKeyImportProperties::EC_PublicKeyImportProperties(const std::vector<byte>& ec_params, + const std::vector<byte>& 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<byte> 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; + } + +size_t PKCS11_EC_PublicKey::max_input_bits() const + { + return domain().get_order().bits(); + } + +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<byte> 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<byte>& 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(), m_point_encoding(PublicPointEncoding::Der) + { + secure_vector<byte> 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<byte>& 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::max_input_bits() const + { + return m_domain_params.get_order().bits(); + } + +std::vector<byte> PKCS11_EC_PrivateKey::x509_subject_public_key() const + { + return unlock(EC2OSP(public_point(), PointGFp::COMPRESSED)); + } + +size_t PKCS11_EC_PrivateKey::estimated_strength() const + { + return ecp_work_factor(domain().get_curve().get_p().bits()); + } + +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 |