ECC key pair format

Jeff-CF-Huang — Thu, 21 Sep 2023 04:00:23 GMT

Hi Sir,

I can generate a ECC key pair like this.

-----BEGIN PUBLIC KEY-----
MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEgGmHQIvKAO1yUeTh46XOw0wqENyW
FLAjyvC4c8h1WQ1Qp+2E3XWc7aWhQ/dntEy1IyxBNrIb/S15TzdTfNfksA==
-----END PUBLIC KEY-----

But, I don't know how to convert them like below example.
Is there any way/tool to do it?

/* ECC NIST-P256 Key Pair */
static uint8_t eccP256BootKeyPub[] =
{
/*Qx*/
0xd6, 0x60, 0x62, 0x71, 0x13, 0x1e, 0x7e, 0x7e, 0x61, 0x7a, 0x81, 0xaa, 0x11, 0xf0, 0x9e, 0x7e,
0xd5, 0x63, 0x11, 0x82, 0x88, 0x23, 0x36, 0x7a, 0x86, 0x9b, 0x45, 0x40, 0x40, 0xb3, 0xf9, 0x05,
/*Qy*/
0xcf, 0x48, 0x97, 0x76, 0x61, 0x31, 0xaa, 0x8b, 0x7f, 0x80, 0x45, 0x3a, 0x15, 0xbf, 0x90, 0xf7,
0x51, 0x78, 0x78, 0x57, 0x9d, 0x5a, 0x4f, 0x97, 0x3a, 0xea, 0x5b, 0xb1, 0x15, 0x42, 0xe0, 0x7f
};
static uint8_t eccP256BootKeyPriv[] =
{
/*k*/
0x00, 0xd0, 0x07, 0xe1, 0xb9, 0xaf, 0xcc, 0x31, 0x2e, 0xec, 0x9c, 0xec, 0xff, 0xa0, 0x28, 0x07,
0x52, 0xbb, 0xd1, 0x95, 0x31, 0x82, 0xed, 0xef, 0x12, 0xf3, 0xfc, 0x36, 0x6e, 0x8f, 0x43, 0x56
};

Re: ECC key pair format

VaneB — Fri, 22 Sep 2023 18:30:47 GMT

Hi @Jeff-CF-Huang

Which device are you using?

Re: ECC key pair format

Jeff-CF-Huang — Fri, 22 Sep 2023 22:30:55 GMT

S32G234M & S32G399

Re: ECC key pair format

Daniel-Aguirre — Mon, 25 Sep 2023 19:24:45 GMT

Hi,

Thanks for the feedback. For what we can see under the S32G tools, there is no Qx/Qy generation. It seems that you should be able to use OpenSSL for this situation, but we don't see any documentation on this specific regard (inside the S32G related documentation). We do apologize.

Please, let us know.

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