premiere-libtorrent/ed25519/src/sign.cpp

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// ignore warnings in this file
#include "libtorrent/aux_/disable_warnings_push.hpp"
2014-07-19 09:12:20 +02:00
#include "libtorrent/ed25519.hpp"
#include "libtorrent/hasher512.hpp"
#include "ge.h"
#include "sc.h"
namespace libtorrent
{
void ed25519_sign(unsigned char *signature, const unsigned char *message, std::ptrdiff_t message_len, const unsigned char *public_key, const unsigned char *private_key) {
ge_p3 R;
hasher512 hash;
hash.update({reinterpret_cast<char const*>(private_key) + 32, 32});
hash.update({reinterpret_cast<char const*>(message), message_len});
sha512_hash r = hash.final();
sc_reduce(reinterpret_cast<unsigned char*>(r.data()));
ge_scalarmult_base(&R, reinterpret_cast<unsigned char*>(r.data()));
ge_p3_tobytes(signature, &R);
hash.reset();
hash.update({reinterpret_cast<char const*>(signature), 32});
hash.update({reinterpret_cast<char const*>(public_key), 32});
hash.update({reinterpret_cast<char const*>(message), message_len});
sha512_hash hram = hash.final();
sc_reduce(reinterpret_cast<unsigned char*>(hram.data()));
sc_muladd(signature + 32
, reinterpret_cast<unsigned char*>(hram.data())
, private_key
, reinterpret_cast<unsigned char*>(r.data()));
}
}