I think it is correct because I extracted the hexadecimal string from
a packet contained in a pcap.
This compressed point is created following the ETSI TS 103 097 v1.3.1
standard for secured communications in the vehicular communication
context
(https://www.etsi.org/deliver/etsi_ts/103000_103099/103097/01.03.01_60/ts_103097v010301p.pdf).
I notice that the point 'pubPoint' that I created is empty when I try
to call 'EC_POINT_set_compressed_coordinates_GFp' function. How can I
put a BIGNUM into an EC_POINT?
Luca
Billy Brumley <bbrumley@xxxxxxxxx> ha scritto:
EC_GROUP* group = EC_GROUP_new_by_curve_name
(NID_secp256k1);
"c16b4ce0532f5dc9d09114fe121d3956ae84f9eb677a0d4bdac1d3af7a91950c";
I don't believe there's a point on secp256k1 with that x-coordinate.
If you check the failure reason for
EC_POINT_set_compressed_coordinates_GFp in the debugger, that is
probably what it is telling you.
Where did this curve / x-coord pair come from?
BBB
