<div dir="ltr">Hello,<div><br></div><div>Thanks a lot, it works fine now.</div><div><br clear="all"><div><div dir="ltr" class="m_-8070362861863538875gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr">Best regards,<br><br>Yann Garcia<br><span style="color:rgb(0,0,0);white-space:pre-wrap">Senior Software Engineer</span><div><span style="font-size:small">Microsoft MCAD.net Certified</span><br>**************************************<br><span style="font-size:small">FSCOM SARL</span><br style="font-size:small"><span style="font-size:small">Le Montespan B2</span><br style="font-size:small"><span style="color:navy;font-family:"Arial",sans-serif;font-size:10pt"><a href="https://maps.google.com/?q=6,%C2%A0+Avenue+des+Alpes&entry=gmail&source=g" target="_blank">6,</a> <a href="https://maps.google.com/?q=6,%C2%A0+Avenue+des+Alpes&entry=gmail&source=g" target="_blank">Avenue des Alpes</a></span><span style="color:navy"> </span><br style="font-size:small"><span style="font-size:small">F-06600 Antibes, FRANCE</span><br>************************************************<br>Tel: +33 (0)4 92 94 49 08<br>Mobile: +33 (0)7 61 00 77 05<br>Email: <a href="mailto:yann.garcia@fscom.fr" target="_blank"><b>yann.garcia@fscom.fr</b></a></div><div> <span style="font-size:12.8px;white-space:nowrap"><a href="mailto:Yann.Garcia_EXT@etsi.org" target="_blank">Yann.Garcia_EXT@etsi.org</a></span><br>Skype: yann.garcia<br>Google+: <a href="mailto:garcia.yann@gmail.com" target="_blank">garcia.yann@gmail.com</a><br></div></div></div></div></div></div></div></div></div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr">On Mon, 26 Nov 2018 at 08:26, Yann Garcia <<a href="mailto:garcia.yann@gmail.com" target="_blank">garcia.yann@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><br clear="all"><div><div dir="ltr" class="m_-8070362861863538875m_1248828016712820764gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div>Hello,<div><br></div><div>Oh yes, forgot it, sorry!</div><div>In my sample, q is the public key.</div><div><br></div><div>Thanks a lot<br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr">Best regards,<br><br>Yann Garcia<br><span style="color:rgb(0,0,0);white-space:pre-wrap">Senior Software Engineer</span><div><span style="font-size:small">Microsoft MCAD.net Certified</span><br>**************************************<br><span style="font-size:small">FSCOM SARL</span><br style="font-size:small"><span style="font-size:small">Le Montespan B2</span><br style="font-size:small"><span style="color:navy;font-family:"Arial",sans-serif;font-size:10pt"><a href="https://maps.google.com/?q=6,%C2%A0+Avenue+des+Alpes&entry=gmail&source=g" target="_blank">6,</a> <a href="https://maps.google.com/?q=6,%C2%A0+Avenue+des+Alpes&entry=gmail&source=g" target="_blank">Avenue des Alpes</a></span><span style="color:navy"> </span><br style="font-size:small"><span style="font-size:small">F-06600 Antibes, FRANCE</span><br>************************************************<br>Tel: +33 (0)4 92 94 49 08<br>Mobile: +33 (0)7 61 00 77 05<br>Email: <a href="mailto:yann.garcia@fscom.fr" target="_blank"><b>yann.garcia@fscom.fr</b></a></div><div> <span style="font-size:12.8px;white-space:nowrap"><a href="mailto:Yann.Garcia_EXT@etsi.org" target="_blank">Yann.Garcia_EXT@etsi.org</a></span><br>Skype: yann.garcia<br>Google+: <a href="mailto:garcia.yann@gmail.com" target="_blank">garcia.yann@gmail.com</a><br></div></div></div></div></div></div></div></div></div></div></div></div><br></div></div></div></div></div></div></div></div></div></div></div></div><br></blockquote></div><br><div class="gmail_quote"><div dir="ltr">On Mon, 26 Nov 2018 at 00:47, NIIBE Yutaka <<a href="mailto:gniibe@fsij.org" target="_blank">gniibe@fsij.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Yann Garcia <<a href="mailto:garcia.yann@gmail.com" target="_blank">garcia.yann@gmail.com</a>> wrote:<br>
> q=hex_to_data("AC529F186F485D194EBE3677EA9FD1D7E7280648081A01686B3E78528D8AA5C6DC44DB3E54EEF45BA7EE989572D1DC0F83FF071E30B1EE5972D52D22D204A0AD",<br>
<br>
I think this representation is...<br>
<br>
[...]<br>
> And here was the issue: I got the error message "gcrypt/Not implemented"<br>
<br>
... not supported by libgcrypt.<br>
<br>
For NIST P-256, only standard encoding (prefixed by 0x04, followed by X<br>
in MPI, then, Y in MPI [0]) is supported. If not, it results an error<br>
in _gcry_ecc_os2ec by GPG_ERR_NOT_IMPLEMENTED (Not implemented).<br>
<br>
Just put the prefix "04" to your representation, if it's composed by X<br>
and Y in big endian.<br>
<br>
[0] <a href="http://www.secg.org/sec1-v2.pdf" rel="noreferrer" target="_blank">http://www.secg.org/sec1-v2.pdf</a><br>
SEC 1: Elliptic Curve Cryptography (Version 2.0)<br>
2.3.3 Elliptic-Curve-Point-to-Octet-String Conversion<br>
-- <br>
</blockquote></div>