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construct/ircd/sodium.cc

175 lines
4.1 KiB
C++

/*
* Copyright (C) 2017 Charybdis Development Team
* Copyright (C) 2017 Jason Volk <jason@zemos.net>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice is present in all copies.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <sodium.h>
///////////////////////////////////////////////////////////////////////////////
//
// Internal
//
struct throw_on_error
{
throw_on_error(const int &val)
{
if(unlikely(val != 0))
throw ircd::nacl::error("sodium error");
}
};
///////////////////////////////////////////////////////////////////////////////
//
// ircd/nacl.h
//
ircd::string_view
ircd::nacl::version()
{
return ::sodium_version_string();
}
ircd::nacl::init::init()
{
if(::sodium_init() < 0)
throw std::runtime_error("sodium_init(): error");
}
ircd::nacl::init::~init()
noexcept
{
}
///////////////////////////////////////////////////////////////////////////////
//
// ircd/buffer.h
//
void
ircd::buffer::zero(const mutable_raw_buffer &buf)
{
sodium_memzero(data(buf), size(buf));
}
///////////////////////////////////////////////////////////////////////////////
//
// ircd/ed25519
//
static_assert(ircd::ed25519::SK_SZ == crypto_sign_ed25519_SECRETKEYBYTES);
static_assert(ircd::ed25519::PK_SZ == crypto_sign_ed25519_PUBLICKEYBYTES);
ircd::ed25519::sk::sk(pk *const &pk_arg,
const const_raw_buffer &seed)
:key
{
reinterpret_cast<uint8_t *>(::sodium_malloc(crypto_sign_ed25519_SECRETKEYBYTES)),
&::sodium_free
}
{
assert(size(seed) >= SEED_SZ);
pk discard, &pk
{
pk_arg? *pk_arg : discard
};
throw_on_error
{
::crypto_sign_ed25519_seed_keypair(pk.data(), key.get(), data(seed))
};
}
ircd::ed25519::sk::sk(const std::string &filename,
pk *const &pk_arg)
:key
{
reinterpret_cast<uint8_t *>(::sodium_malloc(crypto_sign_ed25519_SECRETKEYBYTES)),
&::sodium_free
}
{
pk discard, &pk
{
pk_arg? *pk_arg : discard
};
const auto existing
{
fs::read(filename, mutable_raw_buffer{key.get(), SK_SZ})
};
if(!existing)
{
if(fs::exists(filename))
throw error("Failed to read existing ed25519 secret key in: %s", filename);
throw_on_error
{
::crypto_sign_ed25519_keypair(pk.data(), key.get())
};
fs::write(filename, const_raw_buffer{key.get(), SK_SZ});
}
throw_on_error
{
::crypto_sign_ed25519_sk_to_pk(pk.data(), key.get())
};
}
ircd::ed25519::sig
ircd::ed25519::sk::sign(const const_raw_buffer &msg)
const
{
unsigned long long sig_sz;
struct sig sig;
throw_on_error
{
::crypto_sign_ed25519_detached(sig.data(),
&sig_sz,
buffer::data(msg),
buffer::size(msg),
key.get())
};
assert(sig_sz <= sig.size());
assert(sig.size() >= sig_sz);
memset(sig.data() + sig.size() - sig_sz, 0, sig.size() - sig_sz);
return sig;
}
bool
ircd::ed25519::pk::verify(const const_raw_buffer &msg,
const sig &sig)
const
{
const int ret
{
::crypto_sign_ed25519_verify_detached(sig.data(),
buffer::data(msg),
buffer::size(msg),
data())
};
return ret == 0? true:
ret == -1? false:
throw nacl::error("verify failed: %d", ret);
}