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List: bouncycastle-crypto-dev
Subject: Re: [dev-crypto] Digital Signature support for EdDSA with E25519
From: David Hook <dgh () cryptoworkshop ! com>
Date: 2018-09-11 1:34:13
Message-ID: 07c0ba19-a833-0be5-492f-99d72f75acd1 () cryptoworkshop ! com
[Download RAW message or body]
Hi,
Support for Edwards Curves is now in the latest beta. The best way to
use them is by algorithm name as they follow the RFCs, e.g. Ed448, Ed25519.
See https://www.bouncycastle.org/betas for details.
Regards,
David
On 11/09/18 05:04, Sarah Hand wrote:
> Hi Bouncy Castle Devs,
>
> I'm a relative novice to Java security, but am being asked *to sign
> some data using EdDSA with E25519 elliptic curve*. I'm trying to
> determine if Bouncy Castle supports this or not. I have public/private
> keys already created for that curve and need to use these keys to do
> the signing, but I can't figure out how to initialize/setup the
> classes to work.
>
> For example, I've tried the following code (thinking this is the right
> way to proceed) but cannot determine what algorithm value to provide
> that represents "EdDSA with E25519" that is supported by BC.
>
> Security.addProvider(new BouncyCastleProvider());
> Signature signature = Signature.getInstance("EdDSAE25519", "BC");
>
> I'm not sure if this is relevant or not . . . but I did not find the
> E25519 ellliptic curve listed on the supported curve Wiki page
> - http://www.bouncycastle.org/wiki/pages/viewpage.action?pageId=362269 -
> but since the page hasn't been updated since 2015, I thought it might
> be out of date. But I'm also not sure if this page is documenting what
> types of key generation is supported by BC (which I don't need) or
> what types of keys can be used by BC (for digital signing, for example).
>
> Any additional information you folks can provide, or pointers to
> relevant BC documentation, test classes or examples, is much appreciated.
>
> Thanks,
> Sarah
[Attachment #3 (text/html)]
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<div class="moz-cite-prefix">Hi,<br>
<br>
Support for Edwards Curves is now in the latest beta. The best way
to use them is by algorithm name as they follow the RFCs, e.g.
Ed448, Ed25519.<br>
<br>
See <a class="moz-txt-link-freetext" \
href="https://www.bouncycastle.org/betas">https://www.bouncycastle.org/betas</a> for \
details.<br> <br>
Regards,<br>
<br>
David<br>
<br>
On 11/09/18 05:04, Sarah Hand wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CALZ8mPcn227xy3g6gNfmJajdJ6a_-knvprzvFhraK06kqTdPWQ@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<div dir="ltr"><span style="color:rgb(33,33,33);font-size:9.75px">Hi
Bouncy Castle Devs,</span>
<div style="color:rgb(33,33,33);font-size:9.75px"><br>
</div>
<div style="color:rgb(33,33,33);font-size:9.75px">I'm a relative
novice to Java security, but am being asked <b>to sign some
data using EdDSA with E25519 elliptic curve</b>. I'm trying
to determine if Bouncy Castle supports this or not. I have
public/private keys already created for that curve and need to
use these keys to do the signing, but I can't figure out how
to initialize/setup the classes to work.</div>
<div style="color:rgb(33,33,33);font-size:9.75px"><br>
</div>
<div style="color:rgb(33,33,33);font-size:9.75px">For example,
I've tried the following code (thinking this is the right way
to proceed) but cannot determine what algorithm value to
provide that represents "EdDSA with E25519" that is supported
by BC.</div>
<div style="color:rgb(33,33,33);font-size:9.75px"><br>
</div>
<div style="color:rgb(33,33,33);font-size:9.75px">
<div> Security.addProvider(new BouncyCastleProvider());</div>
</div>
<div style="color:rgb(33,33,33);font-size:9.75px">
<div> Signature signature =
Signature.getInstance("EdDSAE25519", "BC");</div>
</div>
<div style="color:rgb(33,33,33);font-size:9.75px"><br>
</div>
<div style="color:rgb(33,33,33);font-size:9.75px">I'm not sure
if this is relevant or not . . . but I did not find the E25519
ellliptic curve listed on the supported curve Wiki page - <a
href="http://www.bouncycastle.org/wiki/pages/viewpage.action?pageId=362269"
target="_blank" \
moz-do-not-send="true">http://www.bouncycastle.org/wiki/pages/viewpage.action?pageId=362269</a> \
- but since the page hasn't been updated since 2015, I thought
it might be out of date. But I'm also not sure if this page is
documenting what types of key generation is supported by BC
(which I don't need) or what types of keys can be used by BC
(for digital signing, for example).<br>
</div>
<div style="color:rgb(33,33,33);font-size:9.75px"><br>
</div>
<div style="color:rgb(33,33,33);font-size:9.75px">Any additional
information you folks can provide, or pointers to relevant BC
documentation, test classes or examples, is much appreciated.</div>
<div style="color:rgb(33,33,33);font-size:9.75px"><br>
</div>
<div style="color:rgb(33,33,33);font-size:9.75px">Thanks,</div>
<div style="color:rgb(33,33,33);font-size:9.75px">Sarah</div>
</div>
</blockquote>
<p><br>
</p>
</body>
</html>
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