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-rw-r--r--protocols/Telegram/tdlib/td/test/crypto.cpp279
1 files changed, 279 insertions, 0 deletions
diff --git a/protocols/Telegram/tdlib/td/test/crypto.cpp b/protocols/Telegram/tdlib/td/test/crypto.cpp
new file mode 100644
index 0000000000..1837cef631
--- /dev/null
+++ b/protocols/Telegram/tdlib/td/test/crypto.cpp
@@ -0,0 +1,279 @@
+//
+// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2022
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+#include "td/mtproto/AuthKey.h"
+#include "td/mtproto/Transport.h"
+
+#include "td/utils/base64.h"
+#include "td/utils/common.h"
+#include "td/utils/crypto.h"
+#include "td/utils/logging.h"
+#include "td/utils/port/detail/ThreadIdGuard.h"
+#include "td/utils/ScopeGuard.h"
+#include "td/utils/SharedSlice.h"
+#include "td/utils/Slice.h"
+#include "td/utils/Status.h"
+#include "td/utils/StringBuilder.h"
+#include "td/utils/UInt.h"
+
+#include <openssl/bio.h>
+#include <openssl/evp.h>
+#include <openssl/pem.h>
+
+class Handshake {
+ public:
+ struct KeyPair {
+ td::SecureString private_key;
+ td::SecureString public_key;
+ };
+
+ static td::Result<KeyPair> generate_key_pair() {
+ EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(NID_X25519, nullptr);
+ if (pctx == nullptr) {
+ return td::Status::Error("Can't create EXP_PKEY_CTX");
+ }
+ SCOPE_EXIT {
+ EVP_PKEY_CTX_free(pctx);
+ };
+ if (EVP_PKEY_keygen_init(pctx) <= 0) {
+ return td::Status::Error("Can't init keygen");
+ }
+
+ EVP_PKEY *pkey = nullptr;
+ if (EVP_PKEY_keygen(pctx, &pkey) <= 0) {
+ return td::Status::Error("Can't generate key");
+ }
+
+ TRY_RESULT(private_key, X25519_key_from_PKEY(pkey, true));
+ TRY_RESULT(public_key, X25519_key_from_PKEY(pkey, false));
+
+ KeyPair res;
+ res.private_key = std::move(private_key);
+ res.public_key = std::move(public_key);
+
+ return std::move(res);
+ }
+
+ static td::SecureString expand_secret(td::Slice secret) {
+ td::SecureString res(128);
+ td::hmac_sha512(secret, "0", res.as_mutable_slice().substr(0, 64));
+ td::hmac_sha512(secret, "1", res.as_mutable_slice().substr(64, 64));
+ return res;
+ }
+
+ static td::Result<td::SecureString> privateKeyToPem(td::Slice key) {
+ auto pkey_private = EVP_PKEY_new_raw_private_key(EVP_PKEY_X25519, nullptr, key.ubegin(), 32);
+ CHECK(pkey_private != nullptr);
+ auto res = X25519_pem_from_PKEY(pkey_private, true);
+ EVP_PKEY_free(pkey_private);
+ return res;
+ }
+
+ static td::Result<td::SecureString> calc_shared_secret(td::Slice private_key, td::Slice other_public_key) {
+ auto pkey_private = EVP_PKEY_new_raw_private_key(EVP_PKEY_X25519, nullptr, private_key.ubegin(), 32);
+ if (pkey_private == nullptr) {
+ return td::Status::Error("Invalid X25520 private key");
+ }
+ SCOPE_EXIT {
+ EVP_PKEY_free(pkey_private);
+ };
+
+ auto pkey_public =
+ EVP_PKEY_new_raw_public_key(EVP_PKEY_X25519, nullptr, other_public_key.ubegin(), other_public_key.size());
+ if (pkey_public == nullptr) {
+ return td::Status::Error("Invalid X25519 public key");
+ }
+ SCOPE_EXIT {
+ EVP_PKEY_free(pkey_public);
+ };
+
+ EVP_PKEY_CTX *ctx = EVP_PKEY_CTX_new(pkey_private, nullptr);
+ if (ctx == nullptr) {
+ return td::Status::Error("Can't create EVP_PKEY_CTX");
+ }
+ SCOPE_EXIT {
+ EVP_PKEY_CTX_free(ctx);
+ };
+
+ if (EVP_PKEY_derive_init(ctx) <= 0) {
+ return td::Status::Error("Can't init derive");
+ }
+ if (EVP_PKEY_derive_set_peer(ctx, pkey_public) <= 0) {
+ return td::Status::Error("Can't init derive");
+ }
+
+ size_t result_len = 0;
+ if (EVP_PKEY_derive(ctx, nullptr, &result_len) <= 0) {
+ return td::Status::Error("Can't get result length");
+ }
+ if (result_len != 32) {
+ return td::Status::Error("Unexpected result length");
+ }
+
+ td::SecureString result(result_len, '\0');
+ if (EVP_PKEY_derive(ctx, result.as_mutable_slice().ubegin(), &result_len) <= 0) {
+ return td::Status::Error("Failed to compute shared secret");
+ }
+ return std::move(result);
+ }
+
+ private:
+ static td::Result<td::SecureString> X25519_key_from_PKEY(EVP_PKEY *pkey, bool is_private) {
+ auto func = is_private ? &EVP_PKEY_get_raw_private_key : &EVP_PKEY_get_raw_public_key;
+ size_t len = 0;
+ if (func(pkey, nullptr, &len) == 0) {
+ return td::Status::Error("Failed to get raw key length");
+ }
+ CHECK(len == 32);
+
+ td::SecureString result(len);
+ if (func(pkey, result.as_mutable_slice().ubegin(), &len) == 0) {
+ return td::Status::Error("Failed to get raw key");
+ }
+ return std::move(result);
+ }
+
+ static td::Result<td::SecureString> X25519_pem_from_PKEY(EVP_PKEY *pkey, bool is_private) {
+ BIO *mem_bio = BIO_new(BIO_s_mem());
+ SCOPE_EXIT {
+ BIO_vfree(mem_bio);
+ };
+ if (is_private) {
+ PEM_write_bio_PrivateKey(mem_bio, pkey, nullptr, nullptr, 0, nullptr, nullptr);
+ } else {
+ PEM_write_bio_PUBKEY(mem_bio, pkey);
+ }
+ char *data_ptr = nullptr;
+ auto data_size = BIO_get_mem_data(mem_bio, &data_ptr);
+ return td::SecureString(data_ptr, data_size);
+ }
+};
+
+struct HandshakeTest {
+ Handshake::KeyPair alice;
+ Handshake::KeyPair bob;
+
+ td::SecureString shared_secret;
+ td::SecureString key;
+};
+
+static void KDF3(td::Slice auth_key, const td::UInt128 &msg_key, int X, td::UInt256 *aes_key, td::UInt128 *aes_iv) {
+ td::uint8 buf_raw[36 + 16];
+ td::MutableSlice buf(buf_raw, 36 + 16);
+ td::Slice msg_key_slice = td::as_slice(msg_key);
+
+ // sha256_a = SHA256 (msg_key + substr(auth_key, x, 36));
+ buf.copy_from(msg_key_slice);
+ buf.substr(16, 36).copy_from(auth_key.substr(X, 36));
+ td::uint8 sha256_a_raw[32];
+ td::MutableSlice sha256_a(sha256_a_raw, 32);
+ sha256(buf, sha256_a);
+
+ // sha256_b = SHA256 (substr(auth_key, 40+x, 36) + msg_key);
+ buf.copy_from(auth_key.substr(40 + X, 36));
+ buf.substr(36).copy_from(msg_key_slice);
+ td::uint8 sha256_b_raw[32];
+ td::MutableSlice sha256_b(sha256_b_raw, 32);
+ sha256(buf, sha256_b);
+
+ // aes_key = substr(sha256_a, 0, 8) + substr(sha256_b, 8, 16) + substr(sha256_a, 24, 8);
+ td::MutableSlice aes_key_slice(aes_key->raw, sizeof(aes_key->raw));
+ aes_key_slice.copy_from(sha256_a.substr(0, 8));
+ aes_key_slice.substr(8).copy_from(sha256_b.substr(8, 16));
+ aes_key_slice.substr(24).copy_from(sha256_a.substr(24, 8));
+
+ // aes_iv = substr(sha256_b, 0, 4) + substr(sha256_a, 8, 8) + substr(sha256_b, 24, 4);
+ td::MutableSlice aes_iv_slice(aes_iv->raw, sizeof(aes_iv->raw));
+ aes_iv_slice.copy_from(sha256_b.substr(0, 4));
+ aes_iv_slice.substr(4).copy_from(sha256_a.substr(8, 8));
+ aes_iv_slice.substr(12).copy_from(sha256_b.substr(24, 4));
+}
+
+static td::SecureString encrypt(td::Slice key, td::Slice data, td::int32 seqno, int X) {
+ td::SecureString res(data.size() + 4 + 16);
+ res.as_mutable_slice().substr(20).copy_from(data);
+
+ // big endian
+ td::uint8 *ptr = res.as_mutable_slice().substr(16).ubegin();
+ ptr[0] = static_cast<td::uint8>((seqno >> 24) & 255);
+ ptr[1] = static_cast<td::uint8>((seqno >> 16) & 255);
+ ptr[2] = static_cast<td::uint8>((seqno >> 8) & 255);
+ ptr[3] = static_cast<td::uint8>(seqno & 255);
+
+ td::mtproto::AuthKey auth_key(0, key.str());
+ auto payload = res.as_mutable_slice().substr(16);
+ td::UInt128 msg_key = td::mtproto::Transport::calc_message_key2(auth_key, X, payload).second;
+ td::UInt256 aes_key;
+ td::UInt128 aes_iv;
+ KDF3(key, msg_key, X, &aes_key, &aes_iv);
+ td::AesCtrState aes;
+ aes.init(aes_key.as_slice(), aes_iv.as_slice());
+ aes.encrypt(payload, payload);
+ res.as_mutable_slice().copy_from(msg_key.as_slice());
+ return res;
+}
+
+static HandshakeTest gen_test() {
+ HandshakeTest res;
+ res.alice = Handshake::generate_key_pair().move_as_ok();
+
+ res.bob = Handshake::generate_key_pair().move_as_ok();
+ res.shared_secret = Handshake::calc_shared_secret(res.alice.private_key, res.bob.public_key).move_as_ok();
+ res.key = Handshake::expand_secret(res.shared_secret);
+ return res;
+}
+
+static void run_test(const HandshakeTest &test) {
+ auto alice_secret = Handshake::calc_shared_secret(test.alice.private_key, test.bob.public_key).move_as_ok();
+ auto bob_secret = Handshake::calc_shared_secret(test.bob.private_key, test.alice.public_key).move_as_ok();
+ auto key = Handshake::expand_secret(alice_secret);
+ CHECK(alice_secret == bob_secret);
+ CHECK(alice_secret == test.shared_secret);
+ LOG(ERROR) << "Key\n\t" << td::base64url_encode(key) << "\n";
+ CHECK(key == test.key);
+}
+
+static td::StringBuilder &operator<<(td::StringBuilder &sb, const Handshake::KeyPair &key_pair) {
+ sb << "\tpublic_key (base64url) = " << td::base64url_encode(key_pair.public_key) << "\n";
+ sb << "\tprivate_key (base64url) = " << td::base64url_encode(key_pair.private_key) << "\n";
+ sb << "\tprivate_key (pem) = \n" << Handshake::privateKeyToPem(key_pair.private_key).ok() << "\n";
+ return sb;
+}
+
+static td::StringBuilder &operator<<(td::StringBuilder &sb, const HandshakeTest &test) {
+ sb << "Alice\n" << test.alice;
+ sb << "Bob\n" << test.bob;
+ sb << "SharedSecret\n\t" << td::base64url_encode(test.shared_secret) << "\n";
+ sb << "Key\n\t" << td::base64url_encode(test.key) << "\n";
+
+ std::string data = "hello world";
+ sb << "encrypt(\"" << data << "\", X=0) = \n\t" << td::base64url_encode(encrypt(test.key, data, 1, 0)) << "\n";
+ sb << "encrypt(\"" << data << "\", X=8) = \n\t" << td::base64url_encode(encrypt(test.key, data, 1, 8)) << "\n";
+ return sb;
+}
+
+static HandshakeTest pregenerated_test() {
+ HandshakeTest test;
+ test.alice.public_key = td::base64url_decode_secure("QlCME5fXLyyQQWeYnBiGAZbmzuD4ayOuADCFgmioOBY").move_as_ok();
+ test.alice.private_key = td::base64url_decode_secure("8NZGWKfRCJfiks74RG9_xHmYydarLiRsoq8VcJGPglg").move_as_ok();
+ test.bob.public_key = td::base64url_decode_secure("I1yzfmMCZzlI7xwMj1FJ3O3I3_aEUtv6CxbHiDGzr18").move_as_ok();
+ test.bob.private_key = td::base64url_decode_secure("YMGoowtnZ99roUM2y5JRwiQrwGaNJ-ZRE5boy-l4aHg").move_as_ok();
+ test.shared_secret = td::base64url_decode_secure("0IIvKJuXEwmAp41fYhjUnWqLTYQJ7QeKZKYuCG8mFz8").move_as_ok();
+ test.key = td::base64url_decode_secure(
+ "JHmD-XW9j-13G6KP0tArIhQNDRVbRkKxx0MG0pa2nOgwJHNfiggM0I0RiNIr23-1wRboRtan4WvqOHsxAt_cngYX15_"
+ "HYe8tJdEwHcmlnXq7LtprigzExaNJS7skfOo2irClj-7EL06-jMrhfwngSJFsak8JFSw8s6R4fwCsr50")
+ .move_as_ok();
+
+ return test;
+}
+
+int main() {
+ td::detail::ThreadIdGuard thread_id_guard;
+ auto test = gen_test();
+ run_test(test);
+ run_test(pregenerated_test());
+ LOG(ERROR) << "\n" << pregenerated_test();
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-19 03:31:33 +0000