backend_null.cpp

#include <vanetza/common/byte_sequence.hpp>
#include <vanetza/security/backend_null.hpp>
#include <vanetza/security/public_key.hpp>
#include <vanetza/security/signature.hpp>
 
namespace vanetza
{
namespace security
{
 
EcdsaSignature BackendNull::sign_data(const ecdsa256::PrivateKey&, const ByteBuffer&)
{
    static const EcdsaSignature fake = fake_signature();
    return fake;
}
 
bool BackendNull::verify_data(const ecdsa256::PublicKey&, const ByteBuffer&, const EcdsaSignature&)
{
    // accept everything
    return true;
}
 
bool BackendNull::verify_digest(const PublicKey&, const ByteBuffer&, const Signature&)
{
    // accept everything
    return true;
}
 
boost::optional<Uncompressed> BackendNull::decompress_point(const EccPoint& ecc_point)
{
    return boost::none;
}
 
EcdsaSignature BackendNull::fake_signature() const
{
    constexpr std::size_t size = 32;
    EcdsaSignature signature;
    X_Coordinate_Only coordinate;
    coordinate.x = random_byte_sequence(size, 0xdead);
    signature.R = coordinate;
    signature.s = random_byte_sequence(size, 0xbeef);
 
    return signature;
}
 
ByteBuffer BackendNull::calculate_hash(KeyType key, const ByteBuffer& buffer)
{
    ByteBuffer hash;
    switch (key) {
        case KeyType::NistP256:
        case KeyType::BrainpoolP256r1:
            hash.resize(32);
            break;
        case KeyType::BrainpoolP384r1:
            hash.resize(48);
            break;
        default:
            break;
    }
    return hash;
}
 
} // namespace security
} // namespace vanetza