mirror of https://github.com/ipxe/ipxe.git
c9291bc5c7
The elliptic curve point representation for the x25519 curve includes only the X value, since the curve is designed such that the Montgomery ladder does not need to ever know or calculate a Y value. There is no curve point format byte: the public key data is simply the X value. The pre-master secret is also simply the X value of the shared secret curve point. The point representation for the NIST curves includes both X and Y values, and a single curve point format byte that must indicate that the format is uncompressed. The pre-master secret for the NIST curves does not include both X and Y values: only the X value is used. Extend the definition of an elliptic curve to allow the point size to be specified separately from the key size, and extend the definition of a TLS named curve to include an optional curve point format byte and a pre-master secret length. Signed-off-by: Michael Brown <mcb30@ipxe.org> |
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