137 lines
3.9 KiB
C++
137 lines
3.9 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop version of Telegram messaging app, see https://telegram.org
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Telegram Desktop is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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It is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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In addition, as a special exception, the copyright holders give permission
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to link the code of portions of this program with the OpenSSL library.
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Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
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Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
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*/
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#include "mtproto/rsa_public_key.h"
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#include "base/openssl_help.h"
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#include <openssl/rsa.h>
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#include <openssl/pem.h>
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#include <openssl/bio.h>
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#include <openssl/err.h>
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using std::string;
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namespace MTP {
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namespace internal {
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class RSAPublicKey::Private {
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public:
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Private(base::const_byte_span key) : _rsa(PEM_read_bio_RSAPublicKey(BIO_new_mem_buf(const_cast<gsl::byte*>(key.data()), key.size()), 0, 0, 0)) {
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if (_rsa) {
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computeFingerprint();
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}
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}
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Private(base::const_byte_span nBytes, base::const_byte_span eBytes) : _rsa(RSA_new()) {
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if (_rsa) {
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_rsa->n = BN_dup(openssl::BigNum(nBytes).raw());
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_rsa->e = BN_dup(openssl::BigNum(eBytes).raw());
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if (!_rsa->n || !_rsa->e) {
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RSA_free(base::take(_rsa));
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} else {
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computeFingerprint();
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}
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}
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}
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base::byte_vector getN() const {
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Expects(isValid());
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return toBytes(_rsa->n);
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}
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base::byte_vector getE() const {
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Expects(isValid());
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return toBytes(_rsa->e);
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}
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uint64 getFingerPrint() const {
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return _fingerprint;
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}
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bool isValid() const {
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return _rsa != nullptr;
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}
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base::byte_vector encrypt(base::const_byte_span data) const {
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Expects(isValid());
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constexpr auto kEncryptSize = 256;
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auto result = base::byte_vector(kEncryptSize, gsl::byte {});
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auto res = RSA_public_encrypt(kEncryptSize, reinterpret_cast<const unsigned char*>(data.data()), reinterpret_cast<unsigned char*>(result.data()), _rsa, RSA_NO_PADDING);
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if (res != kEncryptSize) {
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ERR_load_crypto_strings();
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LOG(("RSA Error: RSA_public_encrypt failed, key fp: %1, result: %2, error: %3").arg(getFingerPrint()).arg(res).arg(ERR_error_string(ERR_get_error(), 0)));
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return base::byte_vector();
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}
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return result;
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}
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~Private() {
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RSA_free(_rsa);
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}
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private:
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void computeFingerprint() {
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Expects(isValid());
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mtpBuffer string;
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MTP_bytes(toBytes(_rsa->n)).write(string);
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MTP_bytes(toBytes(_rsa->e)).write(string);
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uchar sha1Buffer[20];
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_fingerprint = *(uint64*)(hashSha1(&string[0], string.size() * sizeof(mtpPrime), sha1Buffer) + 3);
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}
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static base::byte_vector toBytes(BIGNUM *number) {
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auto size = BN_num_bytes(number);
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auto result = base::byte_vector(size, gsl::byte {});
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BN_bn2bin(number, reinterpret_cast<unsigned char*>(result.data()));
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return result;
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}
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RSA *_rsa = nullptr;
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uint64 _fingerprint = 0;
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};
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RSAPublicKey::RSAPublicKey(base::const_byte_span key) : _private(std::make_shared<Private>(key)) {
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}
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RSAPublicKey::RSAPublicKey(base::const_byte_span nBytes, base::const_byte_span eBytes) : _private(std::make_shared<Private>(nBytes, eBytes)) {
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}
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bool RSAPublicKey::isValid() const {
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return _private && _private->isValid();
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}
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uint64 RSAPublicKey::getFingerPrint() const {
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Expects(isValid());
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return _private->getFingerPrint();
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}
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base::byte_vector RSAPublicKey::getN() const {
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Expects(isValid());
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return _private->getN();
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}
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base::byte_vector RSAPublicKey::getE() const {
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Expects(isValid());
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return _private->getE();
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}
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base::byte_vector RSAPublicKey::encrypt(base::const_byte_span data) const {
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Expects(isValid());
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return _private->encrypt(data);
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}
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} // namespace internal
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} // namespace MTP
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