Re: Compute EC_KEY starting from X or Y coordinate only

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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






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