https://devzone.nordicsemi.com/f/nordic-q-a/21112/nrfutil-generate-different-public-key-from-opensslHi there, I&#39;m trying to use nrfutil generate package with an extern key pair generated with openSSL. I used opneSLL with prime256v1 curve, which correspond to secp256r1 curve, and got an private key in PEM format, same format that nrfutil gives. Buten-USTelligent Community 13Wed, 05 Apr 2017 13:09:47 GMThttps://devzone.nordicsemi.com/thread/82591?ContentTypeID=1Wed, 05 Apr 2017 13:09:47 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d5e69489-dadf-4023-a08b-62aec5c20557Luccas<p>Ok. I&#39;m trying to find a way to do that. If I discover something I&#39;ll post here. Thanks for the answers!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/82590?ContentTypeID=1Wed, 05 Apr 2017 12:39:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2ca0baa9-9385-45e0-a72d-11eab68e05bcbjorn-spockeli<p>@Luccas: No, not as far as I know.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/82589?ContentTypeID=1Wed, 05 Apr 2017 11:47:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:73b5ec86-e12e-4697-8090-12f89f1a43b9Luccas<p>Oh, thanks for the explanation! I notice that on private key. But now, is there any way to sign a package using nrfutil in big endian?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/82588?ContentTypeID=1Wed, 05 Apr 2017 06:15:25 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3229d4e7-2c6a-46d2-855c-3daeace0c819Turbo J<p>OpenSSL will always display and use keys in big endian byte order, while uECC uses little endian on NRF5x. So a key <code>0x1 0x2 ... 0x31 0x32</code> becomes <code>0x32 0x31 .. 0x02 0x01</code> in uECC.</p> <p>Workaround: Just swap the key bytes around. Note that compressed (33 byte) public keys are special: You need to exclude the first byte IIRC.</p><div style="clear:both;"></div>