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Telegram/SourceFiles/mtproto/details/mtproto_rsa_public_key.h

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+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#pragma once
+
+#include "base/bytes.h"
+
+namespace MTP::details {
+
+// this class holds an RSA public key and can encrypt fixed-size messages with it
+class RSAPublicKey final {
+public:
+	RSAPublicKey() = default;
+	RSAPublicKey(bytes::const_span nBytes, bytes::const_span eBytes);
+	RSAPublicKey(RSAPublicKey &&other) = default;
+	RSAPublicKey(const RSAPublicKey &other) = default;
+	RSAPublicKey &operator=(RSAPublicKey &&other) = default;
+	RSAPublicKey &operator=(const RSAPublicKey &other) = default;
+
+	// key in "-----BEGIN RSA PUBLIC KEY----- ..." format
+	// or in "-----BEGIN PUBLIC KEY----- ..." format
+	explicit RSAPublicKey(bytes::const_span key);
+
+	[[nodiscard]] bool empty() const;
+	[[nodiscard]] bool valid() const;
+	[[nodiscard]] uint64 fingerprint() const;
+	[[nodiscard]] bytes::vector getN() const;
+	[[nodiscard]] bytes::vector getE() const;
+
+	// data has exactly 256 chars to be encrypted
+	[[nodiscard]] bytes::vector encrypt(bytes::const_span data) const;
+
+	// data has exactly 256 chars to be decrypted
+	[[nodiscard]] bytes::vector decrypt(bytes::const_span data) const;
+
+	// data has lequal than 215 chars to be decrypted
+	[[nodiscard]] bytes::vector encryptOAEPpadding(bytes::const_span data) const;
+
+private:
+	class Private;
+	std::shared_ptr<Private> _private;
+
+};
+
+} // namespace MTP::details