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<title>TODO for coming releases</title>
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<body>
<h1> Nettle release plans </h1>
<p> This is an attempt at defining a development target for the next
release of Nettle, inspired by similar pages for recent GMP
releases. [Last updated 2017-11-14]</p>
<p class='should'>
This really ought to be done before release
</p>
<p class='wish'>
Try to get this done before release
</p>
<p class='done'>
Done!
</p>
<p class='postponed'>
Leave for some later release!
</p>
<h1> Plans for nettle-3.4 </h1>
<h2> Bug fixes </h2>
<p class='done'> Fix issues with sizes of objects like the
nettle_hashes array and the ecc_curve structs accidentally leaking
into the ABI. Fix by another level of indirection, with a function
call to return the start address.
</p>
<h2> New features </h2>
<p class='postponed'>
Add larger "safe" curves, e.g., M-383, curve41417, curve448 and
E-521. (curve448 in progress, on its own branch).
</p>
<p class='postponed'>
Add functions for converting ECC points to and from ANSI x9.62.
</p>
<p class='postponed'>
Support for the Skein hash function.
</p>
<p class='postponed'>
Support for more GOST standard algorithms.
</p>
<p class='done'>
Support for CFB mode (patch by Dmitry Eremin-Solenikov posted on
the list).
</p>
<h2> Optimizations </h2>
<p class='postponed'>
Assembly optimizations for ARMv8 (64-bit).
</p>
<p class='postponed'>
Further optimizations of curve25519 and EdDSA, in particular,
<a href='http://www.hyperelliptic.org/EFD/g1p/auto-twisted-extended-1.html#addition-add-2008-hwcd-3'>more
efficient point addition</a>, using extended XYZT coordinates.
</p>
<h2> Miscellaneous </h2>
<p class='postponed'>
Use more functions from GMP-6 and later, when available:
mpn_sec_add_1, mpn_sec_tabselect, mpn_sec_invert, mpn_cnd_swap,
...
</p>
<p class='done'> Change base16 and base64 interfaces to use char
for encoded data, and fix remaining pointer-signedness warnings.
</p>
<h2> Documentation </h2>
<h2> Build system </h2>
<p class='postponed'>
Delete AX_CREATE_STDINT_H, use stdint.h unconditionally.
</p>
<h2> Testing </h2>
<p> Since xenofarm isn't up and running, do some manual testing:
</p>
<ul>
<li class='done'> x86_64-linux-gnu</li>
<li class='done'> x86-linux-gnu</li>
<li class='done'> x86_64-freebsd</li>
<li class='done'> x86-w*ndows (using cross compiler and wine)</li>
<li class='done'> x86_64-w*ndows (using cross compiler and wine)</li>
<li class='done'> x86_64-w*ndows, native</li>
<li class='should'> x86-darwin (needs help from Nettle users)</li>
<li class='should'> x86_64-darwin (needs help from Nettle users)</li>
<li class='wish'> armv5-linux-gnu (qemu)</li>
<li class='done'> armv7el-linux-gnu (qemu)</li>
<li class='done'> armv7hf-linux-gnu (qemu)</li>
<li class='done'> armv8-linux-gnu (qemu)</li>
<li class='done'> ppc32-linux-gnu (qemu)</li>
<li class='done'> ppc64el-linux-gnu (qemu)</li>
<li class='done'> ppc64eb-linux-gnu (qemu)</li>
<li class='wish'> mips32-linux-gnu (qemu)</li>
<li class='done'> mips64eb-linux-gnu (qemu)</li>
<li class='done'> mips64el-linux-gnu (qemu)</li>
<li class='done'> s390x-linux-gnu (qemu)</li>
<li class='done'> m68k-linux-gnu (aranym)</li>
<li class='done'> alpha-linux-gnu (qemu)</li>
<li class='done'> hppa-linux-gnu (qemu)</li>
<li class='done'> sparc32-linux-gnu</li>
<li class='done'> sparc64-linux-gnu</li>
<li class='wish'> armv7-android </li>
</ul>
<h1> Changes under consideration for later releases </h1>
<p> These are some larger changes under consideration. </p>
<h2> Interface changes </h2>
<p class='should'>
For Merkle-Damgaard hash functions, separate the state and the
buffering. E.g., when using them for HMAC keyed "inner" and
"outer" states, we now get three buffers but we only need one.
</p>
<p class='should'>
Reorganize private key operations. Need to support RSA with and
without blinding, and DSA according to spec and some deterministic
variant (like putty
or <a href='http://tools.ietf.org/html/rfc6979'>RFC6979</a>), and
possibly also smartcard versions where the private key is not
available to the library. And without an explosion of the number
of functions.
</p>
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