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authorpukkamustard <pukkamustard@posteo.net>2021-02-05 21:02:47 +0100
committerpukkamustard <pukkamustard@posteo.net>2021-02-05 21:11:01 +0100
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+<!DOCTYPE html>
+<html>
+<head>
+ <meta charset="utf-8"/>
+ <style>
+ table.head, table.foot { width: 100%; }
+ td.head-rtitle, td.foot-os { text-align: right; }
+ td.head-vol { text-align: center; }
+ div.Pp { margin: 1ex 0ex; }
+ </style>
+ <link rel="stylesheet" href="style.css" type="text/css" media="all"/>
+ <title>CRYPTO_FROM_EDDSA_PRIVATE(3MONOCYPHER)</title>
+</head>
+<body>
+<table class="head">
+ <tr>
+ <td class="head-ltitle">CRYPTO_FROM_EDDSA_PRIVATE(3MONOCYPHER)</td>
+ <td class="head-vol">3MONOCYPHER</td>
+ <td class="head-rtitle">CRYPTO_FROM_EDDSA_PRIVATE(3MONOCYPHER)</td>
+ </tr>
+</table>
+<div class="manual-text">
+<h1 class="Sh" title="Sh" id="NAME"><a class="selflink" href="#NAME">NAME</a></h1>
+<b class="Nm" title="Nm">crypto_from_eddsa_private</b>,
+ <b class="Nm" title="Nm">crypto_from_eddsa_public</b> &#x2014;
+ <span class="Nd" title="Nd">conversion of key pairs for EdDSA with BLAKE2b to
+ X25519 key pairs</span>
+<h1 class="Sh" title="Sh" id="SYNOPSIS"><a class="selflink" href="#SYNOPSIS">SYNOPSIS</a></h1>
+<b class="In" title="In">#include
+ &lt;<a class="In" title="In">monocypher.h</a>&gt;</b>
+<div class="Pp"></div>
+<var class="Ft" title="Ft">void</var>
+<br/>
+<b class="Fn" title="Fn">crypto_from_eddsa_private</b>(<var class="Fa" title="Fa">uint8_t
+ x25519[32]</var>, <var class="Fa" title="Fa">const uint8_t eddsa[32]</var>);
+<div class="Pp"></div>
+<var class="Ft" title="Ft">void</var>
+<br/>
+<b class="Fn" title="Fn">crypto_from_eddsa_public</b>(<var class="Fa" title="Fa">uint8_t
+ x25519[32]</var>, <var class="Fa" title="Fa">const uint8_t eddsa[32]</var>);
+<h1 class="Sh" title="Sh" id="DESCRIPTION"><a class="selflink" href="#DESCRIPTION">DESCRIPTION</a></h1>
+These functions convert keys for use with
+ <a class="Xr" title="Xr" href="crypto_sign.html">crypto_sign(3monocypher)</a>
+ (EdDSA with the BLAKE2b hash function) to keys for use with
+ <a class="Xr" title="Xr" href="crypto_key_exchange.html">crypto_key_exchange(3monocypher)</a>
+ and
+ <a class="Xr" title="Xr" href="crypto_x25519.html">crypto_x25519(3monocypher)</a>.
+ This may be useful in some resource-constrained contexts or when no other key
+ is available (for example, when retrieving SSH public keys from GitHub and
+ reusing the SSH public keys as X25519 public keys).
+<div class="Pp"></div>
+The <b class="Fn" title="Fn">crypto_from_eddsa_private</b>() function converts
+ an EdDSA (with BLAKE2b) private key to an X25519 private key. The
+ <b class="Fn" title="Fn">crypto_from_eddsa_public</b>() function converts an
+ EdDSA public key to an X25519 public key.
+<div class="Pp"></div>
+X25519 key pairs cannot be converted back to EdDSA key pairs. The conversion of
+ private keys is specific to EdDSA with BLAKE2b because of the way EdDSA works.
+ In particular, this means that the output of
+ <b class="Fn" title="Fn">crypto_from_eddsa_private</b>() differs from
+ <a class="Xr" title="Xr" href="crypto_from_ed25519_private.html">crypto_from_ed25519_private(3monocypher)</a>
+ in the optional code. However, the output of
+ <b class="Fn" title="Fn">crypto_from_eddsa_public</b>() is identical to
+ <a class="Xr" title="Xr" href="crypto_from_ed25519_public.html">crypto_from_ed25519_public(3monocypher)</a>.
+<div class="Pp"></div>
+The arguments are:
+<dl class="Bl-tag">
+ <dt class="It-tag">&#x00A0;</dt>
+ <dd class="It-tag">&#x00A0;</dd>
+ <dt class="It-tag"><var class="Fa" title="Fa">eddsa</var></dt>
+ <dd class="It-tag">The signing public key or private key to convert to a
+ X25519 public key or private key, respectively.</dd>
+ <dt class="It-tag">&#x00A0;</dt>
+ <dd class="It-tag">&#x00A0;</dd>
+ <dt class="It-tag"><var class="Fa" title="Fa">x25519</var></dt>
+ <dd class="It-tag">The converted private key or public key.</dd>
+</dl>
+<div class="Pp"></div>
+The arguments may overlap or point at the same buffer.
+<h1 class="Sh" title="Sh" id="RETURN_VALUES"><a class="selflink" href="#RETURN_VALUES">RETURN
+ VALUES</a></h1>
+These functions return nothing. They cannot fail.
+<h1 class="Sh" title="Sh" id="SEE_ALSO"><a class="selflink" href="#SEE_ALSO">SEE
+ ALSO</a></h1>
+<a class="Xr" title="Xr" href="crypto_key_exchange_public_key.html">crypto_key_exchange_public_key(3monocypher)</a>,
+ <a class="Xr" title="Xr" href="crypto_sign_public_key.html">crypto_sign_public_key(3monocypher)</a>,
+ <a class="Xr" title="Xr" href="intro.html">intro(3monocypher)</a>
+<h1 class="Sh" title="Sh" id="HISTORY"><a class="selflink" href="#HISTORY">HISTORY</a></h1>
+The <b class="Fn" title="Fn">crypto_from_eddsa_private</b>() and
+ <b class="Fn" title="Fn">crypto_from_eddsa_public</b>() functions first
+ appeared in Monocypher 3.1.0.
+<h1 class="Sh" title="Sh" id="SECURITY_CONSIDERATIONS"><a class="selflink" href="#SECURITY_CONSIDERATIONS">SECURITY
+ CONSIDERATIONS</a></h1>
+It is generally considered poor form to reuse the same key for different
+ purposes. While this conversion is technically safe, avoid these functions
+ nonetheless unless you are particularly resource-constrained or have some
+ other kind of hard requirement. It is otherwise an unnecessary risk
+ factor.</div>
+<table class="foot">
+ <tr>
+ <td class="foot-date">March 25, 2020</td>
+ <td class="foot-os">Linux 4.15.0-106-generic</td>
+ </tr>
+</table>
+</body>
+</html>