Add docstrings for the Session methods
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1 changed files with 44 additions and 2 deletions
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@ -39,8 +39,13 @@ struct Session {
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Curve25519PublicKey alice_base_key;
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Curve25519PublicKey bob_one_time_key;
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/** The number of random bytes that are needed to create a new outbound
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* session. This will be 64 bytes since two ephemeral keys are needed. */
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std::size_t new_outbound_session_random_length();
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/** Start a new outbound session. Returns std::size_t(-1) on failure. On
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* failure last_error will be set with an error code. The last_error will be
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* NOT_ENOUGH_RANDOM if the number of random bytes was too small. */
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std::size_t new_outbound_session(
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Account const & local_account,
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Curve25519PublicKey const & identity_key,
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@ -48,42 +53,79 @@ struct Session {
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std::uint8_t const * random, std::size_t random_length
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);
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/** Start a new inbound session from a pre-key message.
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* Returns std::size_t(-1) on failure. On failure last_error will be set
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* with an error code. The last_error will be BAD_MESSAGE_FORMAT if
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* the message headers could not be decoded. */
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std::size_t new_inbound_session(
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Account & local_account,
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Curve25519PublicKey const * their_identity_key,
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std::uint8_t const * one_time_key_message, std::size_t message_length
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std::uint8_t const * pre_key_message, std::size_t message_length
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);
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/** The number of bytes written by session_id() */
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std::size_t session_id_length();
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/** An identifier for this session. Generated by hashing the public keys
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* used to create the session. Returns the length of the session id on
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* success or std::size_t(-1) on failure. On failure last_error will be set
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* with an error code. The last_error will be OUTPUT_BUFFER_TOO_SMALL if
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* the id buffer was too small. */
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std::size_t session_id(
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std::uint8_t * id, std::size_t id_length
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);
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/** True if this session can be used to decode an inbound pre-key message.
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* This can be used to test whether a pre-key message should be decoded
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* with an existing session or if a new session will need to be created.
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* Returns true if the session is the same. Returns false if either the
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* session does not match or the pre-key message could not be decoded.
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*/
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bool matches_inbound_session(
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Curve25519PublicKey const * their_identity_key,
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std::uint8_t const * one_time_key_message, std::size_t message_length
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std::uint8_t const * pre_key_message, std::size_t message_length
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);
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/** Whether the next message will be a pre-key message or a normal message.
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* An outbound session will send pre-key messages until it receives a
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* message with a ratchet key. */
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MessageType encrypt_message_type();
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std::size_t encrypt_message_length(
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std::size_t plaintext_length
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);
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/** The number of bytes of random data the encrypt method will need to
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* encrypt a message. This will be 32 bytes if the session needs to
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* generate a new ephemeral key, or will be 0 bytes otherwise. */
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std::size_t encrypt_random_length();
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/** Encrypt some plain-text. Returns the length of the encrypted message
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* or std::size_t(-1) on failure. On failure last_error will be set with
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* an error code. The last_error will be NOT_ENOUGH_RANDOM if the number
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* of random bytes is too small. The last_error will be
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* OUTPUT_BUFFER_TOO_SMALL if the output buffer is too small. */
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std::size_t encrypt(
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std::uint8_t const * plaintext, std::size_t plaintext_length,
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std::uint8_t const * random, std::size_t random_length,
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std::uint8_t * message, std::size_t message_length
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);
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/** An upper bound on the number of bytes of plain-text the decrypt method
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* will write for a given input message length. */
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std::size_t decrypt_max_plaintext_length(
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MessageType message_type,
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std::uint8_t const * message, std::size_t message_length
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);
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/** Decrypt a message. Returns the length of the decrypted plain-text or
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* std::size_t(-1) on failure. On failure last_error will be set with an
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* error code. The last_error will be OUTPUT_BUFFER_TOO_SMALL if the
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* plain-text buffer is too small. The last_error will be
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* BAD_MESSAGE_VERSION if the message was encrypted with an unsupported
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* version of the protocol. The last_error will be BAD_MESSAGE_FORMAT if
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* the message headers could not be decoded. The last_error will be
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* BAD_MESSAGE_MAC if the message could not be verified */
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std::size_t decrypt(
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MessageType message_type,
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std::uint8_t const * message, std::size_t message_length,
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