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97 lines
3.9 KiB
C++
97 lines
3.9 KiB
C++
// Copyright (c) 2023 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_BIP324_H
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#define BITCOIN_BIP324_H
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#include <array>
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#include <cstddef>
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#include <optional>
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#include <crypto/chacha20.h>
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#include <crypto/chacha20poly1305.h>
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#include <key.h>
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#include <pubkey.h>
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#include <span.h>
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/** The BIP324 packet cipher, encapsulating its key derivation, stream cipher, and AEAD. */
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class BIP324Cipher
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{
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public:
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static constexpr unsigned SESSION_ID_LEN{32};
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static constexpr unsigned GARBAGE_TERMINATOR_LEN{16};
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static constexpr unsigned REKEY_INTERVAL{224};
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static constexpr unsigned LENGTH_LEN{3};
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static constexpr unsigned HEADER_LEN{1};
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static constexpr unsigned EXPANSION = LENGTH_LEN + HEADER_LEN + FSChaCha20Poly1305::EXPANSION;
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static constexpr std::byte IGNORE_BIT{0x80};
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private:
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std::optional<FSChaCha20> m_send_l_cipher;
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std::optional<FSChaCha20> m_recv_l_cipher;
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std::optional<FSChaCha20Poly1305> m_send_p_cipher;
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std::optional<FSChaCha20Poly1305> m_recv_p_cipher;
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CKey m_key;
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EllSwiftPubKey m_our_pubkey;
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std::array<std::byte, SESSION_ID_LEN> m_session_id;
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std::array<std::byte, GARBAGE_TERMINATOR_LEN> m_send_garbage_terminator;
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std::array<std::byte, GARBAGE_TERMINATOR_LEN> m_recv_garbage_terminator;
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public:
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/** No default constructor; keys must be provided to create a BIP324Cipher. */
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BIP324Cipher() = delete;
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/** Initialize a BIP324 cipher with specified key and encoding entropy (testing only). */
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BIP324Cipher(const CKey& key, Span<const std::byte> ent32) noexcept;
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/** Initialize a BIP324 cipher with specified key (testing only). */
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BIP324Cipher(const CKey& key, const EllSwiftPubKey& pubkey) noexcept;
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/** Retrieve our public key. */
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const EllSwiftPubKey& GetOurPubKey() const noexcept { return m_our_pubkey; }
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/** Initialize when the other side's public key is received. Can only be called once.
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*
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* initiator is set to true if we are the initiator establishing the v2 P2P connection.
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* self_decrypt is only for testing, and swaps encryption/decryption keys, so that encryption
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* and decryption can be tested without knowing the other side's private key.
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*/
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void Initialize(const EllSwiftPubKey& their_pubkey, bool initiator, bool self_decrypt = false) noexcept;
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/** Determine whether this cipher is fully initialized. */
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explicit operator bool() const noexcept { return m_send_l_cipher.has_value(); }
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/** Encrypt a packet. Only after Initialize().
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*
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* It must hold that output.size() == contents.size() + EXPANSION.
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*/
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void Encrypt(Span<const std::byte> contents, Span<const std::byte> aad, bool ignore, Span<std::byte> output) noexcept;
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/** Decrypt the length of a packet. Only after Initialize().
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*
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* It must hold that input.size() == LENGTH_LEN.
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*/
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unsigned DecryptLength(Span<const std::byte> input) noexcept;
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/** Decrypt a packet. Only after Initialize().
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*
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* It must hold that input.size() + LENGTH_LEN == contents.size() + EXPANSION.
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* Contents.size() must equal the length returned by DecryptLength.
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*/
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bool Decrypt(Span<const std::byte> input, Span<const std::byte> aad, bool& ignore, Span<std::byte> contents) noexcept;
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/** Get the Session ID. Only after Initialize(). */
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Span<const std::byte> GetSessionID() const noexcept { return m_session_id; }
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/** Get the Garbage Terminator to send. Only after Initialize(). */
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Span<const std::byte> GetSendGarbageTerminator() const noexcept { return m_send_garbage_terminator; }
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/** Get the expected Garbage Terminator to receive. Only after Initialize(). */
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Span<const std::byte> GetReceiveGarbageTerminator() const noexcept { return m_recv_garbage_terminator; }
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};
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#endif // BITCOIN_BIP324_H
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