external/ton
1
0
Fork 0
mirror of https://github.com/ton-blockchain/ton synced 2025-03-09 15:40:10 +00:00
Code Issues Releases Wiki Activity

initial commit

Browse source
This commit is contained in:
initial commit 2019-09-07 14:03:22 +04:00 • committed by vvaltman
commit c2da007f40
1610 changed files with 398047 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

205
keys/encryptor.cpp Normal file
View file

@ -0,0 +1,205 @@
/*
This file is part of TON Blockchain Library.
TON Blockchain Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
TON Blockchain Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with TON Blockchain Library. If not, see <http://www.gnu.org/licenses/>.
Copyright 2017-2019 Telegram Systems LLP
*/
#include "td/utils/crypto.h"
#include "td/utils/overloaded.h"
#include "encryptor.h"
#include "encryptor.hpp"
#include "auto/tl/ton_api.hpp"
#include "common/status.h"
#include "common/errorcode.h"
#include "keys.hpp"
namespace ton {
td::Result<std::unique_ptr<Encryptor>> Encryptor::create(const ton_api::PublicKey *id) {
td::Result<std::unique_ptr<Encryptor>> res;
ton_api::downcast_call(
*const_cast<ton_api::PublicKey *>(id),
td::overloaded([&](const ton_api::pub_unenc &obj) { res = std::make_unique<EncryptorNone>(); },
[&](const ton_api::pub_ed25519 &obj) { res = std::make_unique<EncryptorEd25519>(obj.key_); },
[&](const ton_api::pub_overlay &obj) { res = std::make_unique<EncryptorOverlay>(); },
[&](const ton_api::pub_aes &obj) { res = std::make_unique<EncryptorAES>(obj.key_); }));
return res;
}
td::Result<std::unique_ptr<Decryptor>> Decryptor::create(const ton_api::PrivateKey *id) {
td::Result<std::unique_ptr<Decryptor>> res;
ton_api::downcast_call(
*const_cast<ton_api::PrivateKey *>(id),
td::overloaded([&](const ton_api::pk_unenc &obj) { res = std::make_unique<DecryptorNone>(); },
[&](const ton_api::pk_ed25519 &obj) { res = std::make_unique<DecryptorEd25519>(obj.key_); },
[&](const ton_api::pk_overlay &obj) { res = std::make_unique<DecryptorFail>(); },
[&](const ton_api::pk_aes &obj) { res = std::make_unique<DecryptorAES>(obj.key_); }));
return res;
}
td::Result<td::BufferSlice> EncryptorEd25519::encrypt(td::Slice data) {
TRY_RESULT_PREFIX(pk, td::Ed25519::generate_private_key(), "failed to generate private key: ");
TRY_RESULT_PREFIX(pubkey, pk.get_public_key(), "failed to get public key from private: ");
auto pubkey_str = pubkey.as_octet_string();
td::BufferSlice msg(pubkey_str.size() + 32 + data.size());
td::MutableSlice slice = msg.as_slice();
slice.copy_from(pubkey_str);
slice.remove_prefix(pubkey_str.size());
TRY_RESULT_PREFIX(shared_secret, td::Ed25519::compute_shared_secret(pub_, pk), "failed to compute shared secret: ");
td::MutableSlice digest = slice.substr(0, 32);
slice.remove_prefix(32);
td::sha256(data, digest);
td::SecureString key(32);
{
auto S = key.as_mutable_slice();
S.copy_from(td::Slice(shared_secret).truncate(16));
S.remove_prefix(16);
S.copy_from(digest.copy().remove_prefix(16).truncate(16));
}
td::SecureString iv(16);
{
auto S = iv.as_mutable_slice();
S.copy_from(digest.copy().truncate(4));
S.remove_prefix(4);
S.copy_from(td::Slice(shared_secret).remove_prefix(20).truncate(12));
}
td::AesCtrState ctr;
ctr.init(key, iv);
ctr.encrypt(data, slice);
return std::move(msg);
}
td::Status EncryptorEd25519::check_signature(td::Slice message, td::Slice signature) {
return td::status_prefix(pub_.verify_signature(message, signature), "bad signature: ");
}
td::Result<td::BufferSlice> DecryptorEd25519::decrypt(td::Slice data) {
if (data.size() < td::Ed25519::PublicKey::LENGTH + 32) {
return td::Status::Error(ErrorCode::protoviolation, "message is too short");
}
td::Slice pub = data.substr(0, td::Ed25519::PublicKey::LENGTH);
data.remove_prefix(td::Ed25519::PublicKey::LENGTH);
td::Slice digest = data.substr(0, 32);
data.remove_prefix(32);
TRY_RESULT_PREFIX(shared_secret,
td::Ed25519::compute_shared_secret(td::Ed25519::PublicKey(td::SecureString(pub)), pk_),
"failed to generate shared secret: ");
td::SecureString key(32);
key.as_mutable_slice().copy_from(td::Slice(shared_secret).substr(0, 16));
key.as_mutable_slice().substr(16).copy_from(digest.substr(16, 16));
td::SecureString iv(16);
iv.as_mutable_slice().copy_from(digest.substr(0, 4));
iv.as_mutable_slice().substr(4).copy_from(td::Slice(shared_secret).substr(20, 12));
td::BufferSlice res(data.size());
td::AesCtrState ctr;
ctr.init(key, iv);
ctr.encrypt(data, res.as_slice());
td::UInt256 real_digest;
td::sha256(res.as_slice(), as_slice(real_digest));
if (as_slice(real_digest) != digest) {
return td::Status::Error(ErrorCode::protoviolation, "sha256 mismatch after decryption");
}
return std::move(res);
}
td::Result<td::BufferSlice> DecryptorEd25519::sign(td::Slice data) {
TRY_RESULT_PREFIX(signature, pk_.sign(data), "failed to sign: ");
return td::BufferSlice(signature);
}
td::Result<td::BufferSlice> EncryptorAES::encrypt(td::Slice data) {
td::BufferSlice msg(32 + data.size());
td::MutableSlice slice = msg.as_slice();
td::MutableSlice digest = slice.substr(0, 32);
slice.remove_prefix(32);
td::sha256(data, digest);
td::SecureString key(32);
key.as_mutable_slice().copy_from(shared_secret_.as_slice().substr(0, 16));
key.as_mutable_slice().substr(16).copy_from(digest.substr(16, 16));
td::SecureString iv(16);
iv.as_mutable_slice().copy_from(digest.substr(0, 4));
iv.as_mutable_slice().substr(4).copy_from(shared_secret_.as_slice().substr(20, 12));
td::AesCtrState ctr;
ctr.init(key, iv);
ctr.encrypt(data, slice);
return std::move(msg);
}
td::Result<td::BufferSlice> DecryptorAES::decrypt(td::Slice data) {
if (data.size() < 32) {
return td::Status::Error(ErrorCode::protoviolation, "message is too short");
}
td::Slice digest = data.substr(0, 32);
data.remove_prefix(32);
td::SecureString key(32);
key.as_mutable_slice().copy_from(shared_secret_.as_slice().substr(0, 16));
key.as_mutable_slice().substr(16).copy_from(digest.substr(16, 16));
td::SecureString iv(16);
iv.as_mutable_slice().copy_from(digest.substr(0, 4));
iv.as_mutable_slice().substr(4).copy_from(shared_secret_.as_slice().substr(20, 12));
td::BufferSlice res(data.size());
td::AesCtrState ctr;
ctr.init(key, iv);
ctr.encrypt(data, res.as_slice());
td::UInt256 real_digest;
td::sha256(res.as_slice(), as_slice(real_digest));
if (as_slice(real_digest) != digest) {
return td::Status::Error(ErrorCode::protoviolation, "sha256 mismatch after decryption");
}
return std::move(res);
}
std::vector<td::Result<td::BufferSlice>> Decryptor::sign_batch(std::vector<td::Slice> data) {
std::vector<td::Result<td::BufferSlice>> r;
r.resize(data.size());
for (size_t i = 0; i < data.size(); i++) {
r[i] = sign(data[i]);
}
return r;
}
} // namespace ton