84 lines
1.9 KiB
C++
84 lines
1.9 KiB
C++
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#ifndef CFE4DC34_AD31_47E8_9EB2_1B98C6FB0887
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#define CFE4DC34_AD31_47E8_9EB2_1B98C6FB0887
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#include <vanetza/common/byte_buffer.hpp>
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#include <boost/variant/variant.hpp>
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namespace vanetza
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{
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namespace security
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{
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// forward declarations
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struct PublicKey;
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namespace ecdsa256 { struct PublicKey; }
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/// X_Coordinate_Only specified in TS 103 097 v1.2.1 in section 4.2.5
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struct X_Coordinate_Only
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{
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ByteBuffer x;
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};
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/// Compressed_Lsb_Y_0 specified in TS 103 097 v1.2.1 in section 4.2.5
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struct Compressed_Lsb_Y_0
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{
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ByteBuffer x;
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};
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/// Compressed_Lsb_Y_1 specified in TS 103 097 v1.2.1 in section 4.2.5
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struct Compressed_Lsb_Y_1
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{
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ByteBuffer x;
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};
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/// Uncompressed specified in TS 103 097 v1.2.1 in section 4.2.5
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struct Uncompressed
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{
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ByteBuffer x;
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ByteBuffer y;
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};
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/// EccPoint specified in TS 103 097 v1.2.1 in section 4.2.5
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using EccPoint = boost::variant<
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X_Coordinate_Only,
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Compressed_Lsb_Y_0,
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Compressed_Lsb_Y_1,
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Uncompressed
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>;
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/**
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* \brief calculate byte length of ECC point structure
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* \param ecc_point
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* \return length in bytes
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*/
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std::size_t get_length(const EccPoint& ecc_point);
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/**
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* \brief Convert EccPoint for signature calculation
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* Uses ecc_point.x as relevant field for signatures.
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*
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* \param ecc_point
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* \return binary representation of ECC point
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*/
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ByteBuffer convert_for_signing(const EccPoint& ecc_point);
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/**
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* \brief Convert a public key into an ECC point, preserving its compression
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* \param public_key public key (uncompressed or compressed)
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* \return ECC point matching the key's own point format
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*/
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EccPoint make_ecc_point(const PublicKey& public_key);
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/**
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* \brief Compressed ECC point from public key
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* \param public_key
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* \return compressed ECC point
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*/
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EccPoint compress_public_key(const PublicKey& public_key);
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EccPoint compress_public_key(const ecdsa256::PublicKey& public_key);
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} // namespace security
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} // namespace vanetza
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#endif /* CFE4DC34_AD31_47E8_9EB2_1B98C6FB0887 */
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