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#include "pubkey.h"
#include <stdexcept>
using std::unique_ptr;
using std::runtime_error;
using std::string;
using namespace erebos;
PublicKey PublicKey::load(const Ref & ref)
{
auto rec = ref->asRecord();
if (!rec)
return PublicKey(nullptr);
if (auto ktype = rec->item("type").asText())
if (ktype.value() != "ed25519")
throw runtime_error("unsupported key type " + ktype.value());
if (auto pubkey = rec->item("pubkey").asBinary())
return PublicKey(EVP_PKEY_new_raw_public_key(EVP_PKEY_ED25519, nullptr,
pubkey.value().data(), pubkey.value().size()));
return PublicKey(nullptr);
}
Ref PublicKey::store(const Storage & st) const
{
vector<Record::Item> items;
items.emplace_back("type", "ed25519");
if (key) {
vector<uint8_t> keyData;
size_t keyLen;
EVP_PKEY_get_raw_public_key(key.get(), nullptr, &keyLen);
keyData.resize(keyLen);
EVP_PKEY_get_raw_public_key(key.get(), keyData.data(), &keyLen);
items.emplace_back("pubkey", keyData);
}
return st.storeObject(Record(std::move(items)));
}
SecretKey SecretKey::generate(const Storage & st)
{
unique_ptr<EVP_PKEY_CTX, void(*)(EVP_PKEY_CTX*)>
pctx(EVP_PKEY_CTX_new_id(EVP_PKEY_ED25519, NULL), &EVP_PKEY_CTX_free);
if (!pctx)
throw runtime_error("failed to generate key");
if (EVP_PKEY_keygen_init(pctx.get()) != 1)
throw runtime_error("failed to generate key");
EVP_PKEY *pkey = NULL;
if (EVP_PKEY_keygen(pctx.get(), &pkey) != 1)
throw runtime_error("failed to generate key");
shared_ptr<EVP_PKEY> seckey(pkey, EVP_PKEY_free);
vector<uint8_t> keyData;
size_t keyLen;
EVP_PKEY_get_raw_public_key(seckey.get(), nullptr, &keyLen);
keyData.resize(keyLen);
EVP_PKEY_get_raw_public_key(seckey.get(), keyData.data(), &keyLen);
auto pubkey = st.store(PublicKey(EVP_PKEY_new_raw_public_key(EVP_PKEY_ED25519, nullptr,
keyData.data(), keyData.size())));
EVP_PKEY_get_raw_private_key(seckey.get(), nullptr, &keyLen);
keyData.resize(keyLen);
EVP_PKEY_get_raw_private_key(seckey.get(), keyData.data(), &keyLen);
st.storeKey(pubkey.ref(), keyData);
return SecretKey(std::move(seckey), pubkey);
}
optional<SecretKey> SecretKey::load(const Stored<PublicKey> & pub)
{
auto keyData = pub.ref().storage().loadKey(pub.ref());
if (!keyData)
return nullopt;
EVP_PKEY * key = EVP_PKEY_new_raw_private_key(EVP_PKEY_ED25519, nullptr,
keyData->data(), keyData->size());
if (!key)
throw runtime_error("falied to parse secret key");
return SecretKey(key, pub);
}
vector<uint8_t> SecretKey::sign(const Digest & dgst) const
{
unique_ptr<EVP_MD_CTX, void(*)(EVP_MD_CTX*)>
mdctx(EVP_MD_CTX_create(), &EVP_MD_CTX_free);
if (!mdctx)
throw runtime_error("failed to create EVP_MD_CTX");
if (EVP_DigestSignInit(mdctx.get(), nullptr, EVP_md_null(),
nullptr, key.get()) != 1)
throw runtime_error("failed to initialize EVP_MD_CTX");
size_t sigLen;
if (EVP_DigestSign(mdctx.get(), nullptr, &sigLen,
dgst.arr().data(), Digest::size) != 1)
throw runtime_error("failed to sign data");
vector<uint8_t> sigData(sigLen);
if (EVP_DigestSign(mdctx.get(), sigData.data(), &sigLen,
dgst.arr().data(), Digest::size) != 1)
throw runtime_error("failed to sign data");
return sigData;
}
Signature Signature::load(const Ref & ref)
{
if (auto rec = ref->asRecord())
if (auto key = rec->item("key").as<PublicKey>())
if (auto sig = rec->item("sig").asBinary())
return Signature(*key, *sig);
return Signature(Stored<PublicKey>::load(ref.storage().zref()), {});
}
Ref Signature::store(const Storage & st) const
{
vector<Record::Item> items;
items.emplace_back("key", key);
items.emplace_back("sig", sig);
return st.storeObject(Record(std::move(items)));
}
bool Signature::verify(const Ref & ref) const
{
unique_ptr<EVP_MD_CTX, void(*)(EVP_MD_CTX*)>
mdctx(EVP_MD_CTX_create(), &EVP_MD_CTX_free);
if (!mdctx)
throw runtime_error("failed to create EVP_MD_CTX");
if (EVP_DigestVerifyInit(mdctx.get(), nullptr, EVP_md_null(),
nullptr, key->key.get()) != 1)
throw runtime_error("failed to initialize EVP_MD_CTX");
return EVP_DigestVerify(mdctx.get(), sig.data(), sig.size(),
ref.digest().arr().data(), Digest::size) == 1;
}
PublicKexKey PublicKexKey::load(const Ref & ref)
{
auto rec = ref->asRecord();
if (!rec)
return PublicKexKey(nullptr);
if (auto ktype = rec->item("type").asText())
if (ktype.value() != "x25519")
throw runtime_error("unsupported key type " + ktype.value());
if (auto pubkey = rec->item("pubkey").asBinary())
return PublicKexKey(EVP_PKEY_new_raw_public_key(EVP_PKEY_X25519, nullptr,
pubkey.value().data(), pubkey.value().size()));
return PublicKexKey(nullptr);
}
Ref PublicKexKey::store(const Storage & st) const
{
vector<Record::Item> items;
items.emplace_back("type", "x25519");
if (key) {
vector<uint8_t> keyData;
size_t keyLen;
EVP_PKEY_get_raw_public_key(key.get(), nullptr, &keyLen);
keyData.resize(keyLen);
EVP_PKEY_get_raw_public_key(key.get(), keyData.data(), &keyLen);
items.emplace_back("pubkey", keyData);
}
return st.storeObject(Record(std::move(items)));
}
SecretKexKey SecretKexKey::generate(const Storage & st)
{
unique_ptr<EVP_PKEY_CTX, void(*)(EVP_PKEY_CTX*)>
pctx(EVP_PKEY_CTX_new_id(EVP_PKEY_X25519, NULL), &EVP_PKEY_CTX_free);
if (!pctx)
throw runtime_error("failed to generate key");
if (EVP_PKEY_keygen_init(pctx.get()) != 1)
throw runtime_error("failed to generate key");
EVP_PKEY *pkey = NULL;
if (EVP_PKEY_keygen(pctx.get(), &pkey) != 1)
throw runtime_error("failed to generate key");
shared_ptr<EVP_PKEY> seckey(pkey, EVP_PKEY_free);
vector<uint8_t> keyData;
size_t keyLen;
EVP_PKEY_get_raw_public_key(seckey.get(), nullptr, &keyLen);
keyData.resize(keyLen);
EVP_PKEY_get_raw_public_key(seckey.get(), keyData.data(), &keyLen);
auto pubkey = st.store(PublicKexKey(EVP_PKEY_new_raw_public_key(EVP_PKEY_X25519, nullptr,
keyData.data(), keyData.size())));
EVP_PKEY_get_raw_private_key(seckey.get(), nullptr, &keyLen);
keyData.resize(keyLen);
EVP_PKEY_get_raw_private_key(seckey.get(), keyData.data(), &keyLen);
st.storeKey(pubkey.ref(), keyData);
return SecretKexKey(std::move(seckey), pubkey);
}
optional<SecretKexKey> SecretKexKey::load(const Stored<PublicKexKey> & pub)
{
auto keyData = pub.ref().storage().loadKey(pub.ref());
if (!keyData)
return nullopt;
EVP_PKEY * key = EVP_PKEY_new_raw_private_key(EVP_PKEY_X25519, nullptr,
keyData->data(), keyData->size());
if (!key)
throw runtime_error("falied to parse secret key");
return SecretKexKey(key, pub);
}
vector<uint8_t> SecretKexKey::dh(const PublicKexKey & pubkey) const
{
unique_ptr<EVP_PKEY_CTX, void(*)(EVP_PKEY_CTX*)>
pctx(EVP_PKEY_CTX_new(key.get(), nullptr), &EVP_PKEY_CTX_free);
if (!pctx)
throw runtime_error("failed to derive shared secret");
if (EVP_PKEY_derive_init(pctx.get()) <= 0)
throw runtime_error("failed to derive shared secret");
if (EVP_PKEY_derive_set_peer(pctx.get(), pubkey.key.get()) <= 0)
throw runtime_error("failed to derive shared secret");
size_t dhlen;
if (EVP_PKEY_derive(pctx.get(), NULL, &dhlen) <= 0)
throw runtime_error("failed to derive shared secret");
vector<uint8_t> dhsecret(dhlen);
if (EVP_PKEY_derive(pctx.get(), dhsecret.data(), &dhlen) <= 0)
throw runtime_error("failed to derive shared secret");
return dhsecret;
}
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