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construct/ircd/sodium.cc

213 lines
4.1 KiB
C++

// Matrix Construct
//
// Copyright (C) Matrix Construct Developers, Authors & Contributors
// Copyright (C) 2016-2018 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. The
// full license for this software is available in the LICENSE file.
#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
//
size_t
ircd::buffer::zero(const mutable_buffer &buf)
{
sodium_memzero(data(buf), size(buf));
return 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_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
};
const auto pk_data
{
reinterpret_cast<uint8_t *>(pk.data())
};
const auto seed_data
{
reinterpret_cast<const uint8_t *>(data(seed))
};
throw_on_error
{
::crypto_sign_ed25519_seed_keypair(pk_data, key.get(), seed_data)
};
}
ircd::ed25519::sk::sk(const std::string &filename,
pk *const &pk_arg)
try
:key
{
reinterpret_cast<uint8_t *>(::sodium_malloc(crypto_sign_ed25519_SECRETKEYBYTES)),
&::sodium_free
}
{
pk discard, &pk
{
pk_arg? *pk_arg : discard
};
const auto pk_data
{
reinterpret_cast<uint8_t *>(pk.data())
};
const mutable_buffer key_data
{
reinterpret_cast<char *>(key.get()), SK_SZ
};
if(!fs::exists(filename))
{
throw_on_error
{
::crypto_sign_ed25519_keypair(pk_data, key.get())
};
fs::write(filename, key_data);
}
else fs::read(filename, key_data);
throw_on_error
{
::crypto_sign_ed25519_sk_to_pk(pk_data, key.get())
};
}
catch(const std::exception &e)
{
throw error
{
"Failed to read existing ed25519 secret key in: %s :%s",
filename,
e.what()
};
}
ircd::ed25519::sig
ircd::ed25519::sk::sign(const const_buffer &msg)
const
{
struct sig sig;
unsigned long long sig_sz;
const auto sig_data
{
reinterpret_cast<uint8_t *>(sig.data())
};
const auto msg_data
{
reinterpret_cast<const uint8_t *>(buffer::data(msg))
};
throw_on_error
{
::crypto_sign_ed25519_detached(sig_data,
&sig_sz,
msg_data,
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_buffer &msg,
const sig &sig)
const
{
const auto sig_data
{
reinterpret_cast<const uint8_t *>(sig.data())
};
const auto msg_data
{
reinterpret_cast<const uint8_t *>(buffer::data(msg))
};
const auto key_data
{
reinterpret_cast<const uint8_t *>(data())
};
const int ret
{
::crypto_sign_ed25519_verify_detached(sig_data,
msg_data,
buffer::size(msg),
key_data)
};
return ret == 0? true:
ret == -1? false:
throw nacl::error("verify failed: %d", ret);
}