103 lines
2.7 KiB
C++
103 lines
2.7 KiB
C++
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#include <vanetza/security/ecc_point.hpp>
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#include <vanetza/security/ecdsa256.hpp>
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#include <vanetza/security/public_key.hpp>
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#include <boost/variant/apply_visitor.hpp>
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#include <boost/variant/static_visitor.hpp>
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#include <stdexcept>
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namespace vanetza
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{
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namespace security
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{
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class EccPointVisitor : public boost::static_visitor<ByteBuffer>
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{
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public:
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template<typename T>
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ByteBuffer operator()(const T& point)
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{
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return point.x;
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}
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};
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ByteBuffer convert_for_signing(const EccPoint& ecc_point)
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{
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EccPointVisitor visit;
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return boost::apply_visitor(visit, ecc_point);
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}
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class EccPointLengthVisitor : public boost::static_visitor<std::size_t>
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{
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public:
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std::size_t operator()(const X_Coordinate_Only& x_only) const
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{
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return x_only.x.size();
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}
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std::size_t operator()(const Compressed_Lsb_Y_0& y0) const
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{
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return y0.x.size();
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}
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std::size_t operator()(const Compressed_Lsb_Y_1& y1) const
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{
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return y1.x.size();
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}
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std::size_t operator()(const Uncompressed& unc) const
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{
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return unc.x.size() + unc.y.size();
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}
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};
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std::size_t get_length(const EccPoint& point)
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{
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EccPointLengthVisitor visitor;
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return boost::apply_visitor(visitor, point);
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}
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EccPoint compress_public_key(const PublicKey& public_key)
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{
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switch (public_key.compression)
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{
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case KeyCompression::NoCompression:
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if (!public_key.y.empty() && public_key.y.back() & 0x01) {
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return Compressed_Lsb_Y_1 {public_key.x };
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} else {
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return Compressed_Lsb_Y_0 {public_key.x };
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}
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case KeyCompression::Y0:
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return Compressed_Lsb_Y_0 {public_key.x };
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case KeyCompression::Y1:
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return Compressed_Lsb_Y_1 {public_key.x };
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default:
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return Compressed_Lsb_Y_0 {};
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}
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}
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EccPoint make_ecc_point(const PublicKey& public_key)
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{
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switch (public_key.compression)
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{
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case KeyCompression::NoCompression:
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return Uncompressed { public_key.x, public_key.y };
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case KeyCompression::Y0:
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return Compressed_Lsb_Y_0 { public_key.x };
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case KeyCompression::Y1:
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return Compressed_Lsb_Y_1 { public_key.x };
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}
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throw std::invalid_argument("public key has an unknown point compression");
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}
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EccPoint compress_public_key(const ecdsa256::PublicKey& public_key)
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{
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if (!public_key.y.empty() && public_key.y.back() & 0x01) {
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return Compressed_Lsb_Y_1 { ByteBuffer { public_key.x.begin(), public_key.x.end() } };
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} else {
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return Compressed_Lsb_Y_0 { ByteBuffer { public_key.x.begin(), public_key.x.end() } };
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}
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}
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} // namespace security
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} // namespace vanetza
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