diff options
Diffstat (limited to 'python/include/olm/olm.h')
| -rw-r--r-- | python/include/olm/olm.h | 787 |
1 files changed, 787 insertions, 0 deletions
diff --git a/python/include/olm/olm.h b/python/include/olm/olm.h new file mode 100644 index 0000000..1ea0971 --- /dev/null +++ b/python/include/olm/olm.h @@ -0,0 +1,787 @@ +/* Copyright 2015, 2016 OpenMarket Ltd + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +static const size_t OLM_MESSAGE_TYPE_PRE_KEY = 0; +static const size_t OLM_MESSAGE_TYPE_MESSAGE = 1; + +typedef struct OlmAccount OlmAccount; +typedef struct OlmSession OlmSession; +typedef struct OlmUtility OlmUtility; + +/** Get the version number of the library. + * Arguments will be updated if non-null. + */ +void olm_get_library_version(uint8_t *major, uint8_t *minor, uint8_t *patch); + +/** The size of an account object in bytes */ +size_t olm_account_size(); + +/** The size of a session object in bytes */ +size_t olm_session_size(); + +/** The size of a utility object in bytes */ +size_t olm_utility_size(); + +/** Initialise an account object using the supplied memory + * The supplied memory must be at least olm_account_size() bytes */ +OlmAccount * olm_account( + void * memory +); + +/** Initialise a session object using the supplied memory + * The supplied memory must be at least olm_session_size() bytes */ +OlmSession * olm_session( + void * memory +); + +/** Initialise a utility object using the supplied memory + * The supplied memory must be at least olm_utility_size() bytes */ +OlmUtility * olm_utility( + void * memory +); + +/** The value that olm will return from a function if there was an error */ +size_t olm_error(); + +/** A null terminated string describing the most recent error to happen to an + * account */ +const char * olm_account_last_error( + OlmAccount * account +); + +/** A null terminated string describing the most recent error to happen to a + * session */ +const char * olm_session_last_error( + OlmSession * session +); + +/** A null terminated string describing the most recent error to happen to a + * utility */ +const char * olm_utility_last_error( + OlmUtility * utility +); + +/** Clears the memory used to back this account */ +size_t olm_clear_account( + OlmAccount * account +); + +/** Clears the memory used to back this session */ +size_t olm_clear_session( + OlmSession * session +); + +/** Clears the memory used to back this utility */ +size_t olm_clear_utility( + OlmUtility * utility +); + +/** Returns the number of bytes needed to store an account */ +size_t olm_pickle_account_length( + OlmAccount * account +); + +/** Returns the number of bytes needed to store a session */ +size_t olm_pickle_session_length( + OlmSession * session +); + +/** Stores an account as a base64 string. Encrypts the account using the + * supplied key. Returns the length of the pickled account on success. + * Returns olm_error() on failure. If the pickle output buffer + * is smaller than olm_pickle_account_length() then + * olm_account_last_error() will be "OUTPUT_BUFFER_TOO_SMALL" */ +size_t olm_pickle_account( + OlmAccount * account, + void const * key, size_t key_length, + void * pickled, size_t pickled_length +); + +/** Stores a session as a base64 string. Encrypts the session using the + * supplied key. Returns the length of the pickled session on success. + * Returns olm_error() on failure. If the pickle output buffer + * is smaller than olm_pickle_session_length() then + * olm_session_last_error() will be "OUTPUT_BUFFER_TOO_SMALL" */ +size_t olm_pickle_session( + OlmSession * session, + void const * key, size_t key_length, + void * pickled, size_t pickled_length +); + +/** Loads an account from a pickled base64 string. Decrypts the account using + * the supplied key. Returns olm_error() on failure. If the key doesn't + * match the one used to encrypt the account then olm_account_last_error() + * will be "BAD_ACCOUNT_KEY". If the base64 couldn't be decoded then + * olm_account_last_error() will be "INVALID_BASE64". The input pickled + * buffer is destroyed */ +size_t olm_unpickle_account( + OlmAccount * account, + void const * key, size_t key_length, + void * pickled, size_t pickled_length +); + +/** Loads a session from a pickled base64 string. Decrypts the session using + * the supplied key. Returns olm_error() on failure. If the key doesn't + * match the one used to encrypt the account then olm_session_last_error() + * will be "BAD_ACCOUNT_KEY". If the base64 couldn't be decoded then + * olm_session_last_error() will be "INVALID_BASE64". The input pickled + * buffer is destroyed */ +size_t olm_unpickle_session( + OlmSession * session, + void const * key, size_t key_length, + void * pickled, size_t pickled_length +); + +/** The number of random bytes needed to create an account.*/ +size_t olm_create_account_random_length( + OlmAccount * account +); + +/** Creates a new account. Returns olm_error() on failure. If weren't + * enough random bytes then olm_account_last_error() will be + * "NOT_ENOUGH_RANDOM" */ +size_t olm_create_account( + OlmAccount * account, + void * random, size_t random_length +); + +/** The size of the output buffer needed to hold the identity keys */ +size_t olm_account_identity_keys_length( + OlmAccount * account +); + +/** Writes the public parts of the identity keys for the account into the + * identity_keys output buffer. Returns olm_error() on failure. If the + * identity_keys buffer was too small then olm_account_last_error() will be + * "OUTPUT_BUFFER_TOO_SMALL". */ +size_t olm_account_identity_keys( + OlmAccount * account, + void * identity_keys, size_t identity_key_length +); + + +/** The length of an ed25519 signature encoded as base64. */ +size_t olm_account_signature_length( + OlmAccount * account +); + +/** Signs a message with the ed25519 key for this account. Returns olm_error() + * on failure. If the signature buffer was too small then + * olm_account_last_error() will be "OUTPUT_BUFFER_TOO_SMALL" */ +size_t olm_account_sign( + OlmAccount * account, + void const * message, size_t message_length, + void * signature, size_t signature_length +); + +/** The size of the output buffer needed to hold the one time keys */ +size_t olm_account_one_time_keys_length( + OlmAccount * account +); + +/** Writes the public parts of the unpublished one time keys for the account + * into the one_time_keys output buffer. + * <p> + * The returned data is a JSON-formatted object with the single property + * <tt>curve25519</tt>, which is itself an object mapping key id to + * base64-encoded Curve25519 key. For example: + * <pre> + * { + * curve25519: { + * "AAAAAA": "wo76WcYtb0Vk/pBOdmduiGJ0wIEjW4IBMbbQn7aSnTo", + * "AAAAAB": "LRvjo46L1X2vx69sS9QNFD29HWulxrmW11Up5AfAjgU" + * } + * } + * </pre> + * Returns olm_error() on failure. + * <p> + * If the one_time_keys buffer was too small then olm_account_last_error() + * will be "OUTPUT_BUFFER_TOO_SMALL". */ +size_t olm_account_one_time_keys( + OlmAccount * account, + void * one_time_keys, size_t one_time_keys_length +); + +/** Marks the current set of one time keys as being published. */ +size_t olm_account_mark_keys_as_published( + OlmAccount * account +); + +/** The largest number of one time keys this account can store. */ +size_t olm_account_max_number_of_one_time_keys( + OlmAccount * account +); + +/** The number of random bytes needed to generate a given number of new one + * time keys. */ +size_t olm_account_generate_one_time_keys_random_length( + OlmAccount * account, + size_t number_of_keys +); + +/** Generates a number of new one time keys. If the total number of keys stored + * by this account exceeds max_number_of_one_time_keys() then the old keys are + * discarded. Returns olm_error() on error. If the number of random bytes is + * too small then olm_account_last_error() will be "NOT_ENOUGH_RANDOM". */ +size_t olm_account_generate_one_time_keys( + OlmAccount * account, + size_t number_of_keys, + void * random, size_t random_length +); + +/** The number of random bytes needed to create an outbound session */ +size_t olm_create_outbound_session_random_length( + OlmSession * session +); + +/** Creates a new out-bound session for sending messages to a given identity_key + * and one_time_key. Returns olm_error() on failure. If the keys couldn't be + * decoded as base64 then olm_session_last_error() will be "INVALID_BASE64" + * If there weren't enough random bytes then olm_session_last_error() will + * be "NOT_ENOUGH_RANDOM". */ +size_t olm_create_outbound_session( + OlmSession * session, + OlmAccount * account, + void const * their_identity_key, size_t their_identity_key_length, + void const * their_one_time_key, size_t their_one_time_key_length, + void * random, size_t random_length +); + +/** Create a new in-bound session for sending/receiving messages from an + * incoming PRE_KEY message. Returns olm_error() on failure. If the base64 + * couldn't be decoded then olm_session_last_error will be "INVALID_BASE64". + * If the message was for an unsupported protocol version then + * olm_session_last_error() will be "BAD_MESSAGE_VERSION". If the message + * couldn't be decoded then then olm_session_last_error() will be + * "BAD_MESSAGE_FORMAT". If the message refers to an unknown one time + * key then olm_session_last_error() will be "BAD_MESSAGE_KEY_ID". */ +size_t olm_create_inbound_session( + OlmSession * session, + OlmAccount * account, + void * one_time_key_message, size_t message_length +); + +/** Create a new in-bound session for sending/receiving messages from an + * incoming PRE_KEY message. Returns olm_error() on failure. If the base64 + * couldn't be decoded then olm_session_last_error will be "INVALID_BASE64". + * If the message was for an unsupported protocol version then + * olm_session_last_error() will be "BAD_MESSAGE_VERSION". If the message + * couldn't be decoded then then olm_session_last_error() will be + * "BAD_MESSAGE_FORMAT". If the message refers to an unknown one time + * key then olm_session_last_error() will be "BAD_MESSAGE_KEY_ID". */ +size_t olm_create_inbound_session_from( + OlmSession * session, + OlmAccount * account, + void const * their_identity_key, size_t their_identity_key_length, + void * one_time_key_message, size_t message_length +); + +/** The length of the buffer needed to return the id for this session. */ +size_t olm_session_id_length( + OlmSession * session +); + +/** An identifier for this session. Will be the same for both ends of the + * conversation. If the id buffer is too small then olm_session_last_error() + * will be "OUTPUT_BUFFER_TOO_SMALL". */ +size_t olm_session_id( + OlmSession * session, + void * id, size_t id_length +); + +int olm_session_has_received_message( + OlmSession *session +); + +/** Checks if the PRE_KEY message is for this in-bound session. This can happen + * if multiple messages are sent to this account before this account sends a + * message in reply. Returns 1 if the session matches. Returns 0 if the session + * does not match. Returns olm_error() on failure. If the base64 + * couldn't be decoded then olm_session_last_error will be "INVALID_BASE64". + * If the message was for an unsupported protocol version then + * olm_session_last_error() will be "BAD_MESSAGE_VERSION". If the message + * couldn't be decoded then then olm_session_last_error() will be + * "BAD_MESSAGE_FORMAT". */ +size_t olm_matches_inbound_session( + OlmSession * session, + void * one_time_key_message, size_t message_length +); + +/** Checks if the PRE_KEY message is for this in-bound session. This can happen + * if multiple messages are sent to this account before this account sends a + * message in reply. Returns 1 if the session matches. Returns 0 if the session + * does not match. Returns olm_error() on failure. If the base64 + * couldn't be decoded then olm_session_last_error will be "INVALID_BASE64". + * If the message was for an unsupported protocol version then + * olm_session_last_error() will be "BAD_MESSAGE_VERSION". If the message + * couldn't be decoded then then olm_session_last_error() will be + * "BAD_MESSAGE_FORMAT". */ +size_t olm_matches_inbound_session_from( + OlmSession * session, + void const * their_identity_key, size_t their_identity_key_length, + void * one_time_key_message, size_t message_length +); + +/** Removes the one time keys that the session used from the account. Returns + * olm_error() on failure. If the account doesn't have any matching one time + * keys then olm_account_last_error() will be "BAD_MESSAGE_KEY_ID". */ +size_t olm_remove_one_time_keys( + OlmAccount * account, + OlmSession * session +); + +/** The type of the next message that olm_encrypt() will return. Returns + * OLM_MESSAGE_TYPE_PRE_KEY if the message will be a PRE_KEY message. + * Returns OLM_MESSAGE_TYPE_MESSAGE if the message will be a normal message. + * Returns olm_error on failure. */ +size_t olm_encrypt_message_type( + OlmSession * session +); + +/** The number of random bytes needed to encrypt the next message. */ +size_t olm_encrypt_random_length( + OlmSession * session +); + +/** The size of the next message in bytes for the given number of plain-text + * bytes. */ +size_t olm_encrypt_message_length( + OlmSession * session, + size_t plaintext_length +); + +/** Encrypts a message using the session. Returns the length of the message in + * bytes on success. Writes the message as base64 into the message buffer. + * Returns olm_error() on failure. If the message buffer is too small then + * olm_session_last_error() will be "OUTPUT_BUFFER_TOO_SMALL". If there + * weren't enough random bytes then olm_session_last_error() will be + * "NOT_ENOUGH_RANDOM". */ +size_t olm_encrypt( + OlmSession * session, + void const * plaintext, size_t plaintext_length, + void * random, size_t random_length, + void * message, size_t message_length +); + +/** The maximum number of bytes of plain-text a given message could decode to. + * The actual size could be different due to padding. The input message buffer + * is destroyed. Returns olm_error() on failure. If the message base64 + * couldn't be decoded then olm_session_last_error() will be + * "INVALID_BASE64". If the message is for an unsupported version of the + * protocol then olm_session_last_error() will be "BAD_MESSAGE_VERSION". + * If the message couldn't be decoded then olm_session_last_error() will be + * "BAD_MESSAGE_FORMAT". */ +size_t olm_decrypt_max_plaintext_length( + OlmSession * session, + size_t message_type, + void * message, size_t message_length +); + +/** Decrypts a message using the session. The input message buffer is destroyed. + * Returns the length of the plain-text on success. Returns olm_error() on + * failure. If the plain-text buffer is smaller than + * olm_decrypt_max_plaintext_length() then olm_session_last_error() + * will be "OUTPUT_BUFFER_TOO_SMALL". If the base64 couldn't be decoded then + * olm_session_last_error() will be "INVALID_BASE64". If the message is for + * an unsupported version of the protocol then olm_session_last_error() will + * be "BAD_MESSAGE_VERSION". If the message couldn't be decoded then + * olm_session_last_error() will be BAD_MESSAGE_FORMAT". + * If the MAC on the message was invalid then olm_session_last_error() will + * be "BAD_MESSAGE_MAC". */ +size_t olm_decrypt( + OlmSession * session, + size_t message_type, + void * message, size_t message_length, + void * plaintext, size_t max_plaintext_length +); + +/** The length of the buffer needed to hold the SHA-256 hash. */ +size_t olm_sha256_length( + OlmUtility * utility +); + +/** Calculates the SHA-256 hash of the input and encodes it as base64. If the + * output buffer is smaller than olm_sha256_length() then + * olm_session_last_error() will be "OUTPUT_BUFFER_TOO_SMALL". */ +size_t olm_sha256( + OlmUtility * utility, + void const * input, size_t input_length, + void * output, size_t output_length +); + +/** Verify an ed25519 signature. If the key was too small then + * olm_session_last_error will be "INVALID_BASE64". If the signature was invalid + * then olm_session_last_error() will be "BAD_MESSAGE_MAC". */ +size_t olm_ed25519_verify( + OlmUtility * utility, + void const * key, size_t key_length, + void const * message, size_t message_length, + void * signature, size_t signature_length +); + +typedef struct OlmOutboundGroupSession OlmOutboundGroupSession; + +/** get the size of an outbound group session, in bytes. */ +size_t olm_outbound_group_session_size(); + +/** + * Initialise an outbound group session object using the supplied memory + * The supplied memory should be at least olm_outbound_group_session_size() + * bytes. + */ +OlmOutboundGroupSession * olm_outbound_group_session( + void *memory +); + +/** + * A null terminated string describing the most recent error to happen to a + * group session */ +const char *olm_outbound_group_session_last_error( + const OlmOutboundGroupSession *session +); + +/** Clears the memory used to back this group session */ +size_t olm_clear_outbound_group_session( + OlmOutboundGroupSession *session +); + +/** Returns the number of bytes needed to store an outbound group session */ +size_t olm_pickle_outbound_group_session_length( + const OlmOutboundGroupSession *session +); + +/** + * Stores a group session as a base64 string. Encrypts the session using the + * supplied key. Returns the length of the session on success. + * + * Returns olm_error() on failure. If the pickle output buffer + * is smaller than olm_pickle_outbound_group_session_length() then + * olm_outbound_group_session_last_error() will be "OUTPUT_BUFFER_TOO_SMALL" + */ +size_t olm_pickle_outbound_group_session( + OlmOutboundGroupSession *session, + void const * key, size_t key_length, + void * pickled, size_t pickled_length +); + +/** + * Loads a group session from a pickled base64 string. Decrypts the session + * using the supplied key. + * + * Returns olm_error() on failure. If the key doesn't match the one used to + * encrypt the account then olm_outbound_group_session_last_error() will be + * "BAD_ACCOUNT_KEY". If the base64 couldn't be decoded then + * olm_outbound_group_session_last_error() will be "INVALID_BASE64". The input + * pickled buffer is destroyed + */ +size_t olm_unpickle_outbound_group_session( + OlmOutboundGroupSession *session, + void const * key, size_t key_length, + void * pickled, size_t pickled_length +); + + +/** The number of random bytes needed to create an outbound group session */ +size_t olm_init_outbound_group_session_random_length( + const OlmOutboundGroupSession *session +); + +/** + * Start a new outbound group session. Returns olm_error() on failure. On + * failure last_error will be set with an error code. The last_error will be + * NOT_ENOUGH_RANDOM if the number of random bytes was too small. + */ +size_t olm_init_outbound_group_session( + OlmOutboundGroupSession *session, + uint8_t *random, size_t random_length +); + +/** + * The number of bytes that will be created by encrypting a message + */ +size_t olm_group_encrypt_message_length( + OlmOutboundGroupSession *session, + size_t plaintext_length +); + +/** + * Encrypt some plain-text. Returns the length of the encrypted message or + * olm_error() on failure. On failure last_error will be set with an + * error code. The last_error will be OUTPUT_BUFFER_TOO_SMALL if the output + * buffer is too small. + */ +size_t olm_group_encrypt( + OlmOutboundGroupSession *session, + uint8_t const * plaintext, size_t plaintext_length, + uint8_t * message, size_t message_length +); + + +/** + * Get the number of bytes returned by olm_outbound_group_session_id() + */ +size_t olm_outbound_group_session_id_length( + const OlmOutboundGroupSession *session +); + +/** + * Get a base64-encoded identifier for this session. + * + * Returns the length of the session id on success or olm_error() on + * failure. On failure last_error will be set with an error code. The + * last_error will be OUTPUT_BUFFER_TOO_SMALL if the id buffer was too + * small. + */ +size_t olm_outbound_group_session_id( + OlmOutboundGroupSession *session, + uint8_t * id, size_t id_length +); + +/** + * Get the current message index for this session. + * + * Each message is sent with an increasing index; this returns the index for + * the next message. + */ +uint32_t olm_outbound_group_session_message_index( + OlmOutboundGroupSession *session +); + +/** + * Get the number of bytes returned by olm_outbound_group_session_key() + */ +size_t olm_outbound_group_session_key_length( + const OlmOutboundGroupSession *session +); + +/** + * Get the base64-encoded current ratchet key for this session. + * + * Each message is sent with a different ratchet key. This function returns the + * ratchet key that will be used for the next message. + * + * Returns the length of the ratchet key on success or olm_error() on + * failure. On failure last_error will be set with an error code. The + * last_error will be OUTPUT_BUFFER_TOO_SMALL if the buffer was too small. + */ +size_t olm_outbound_group_session_key( + OlmOutboundGroupSession *session, + uint8_t * key, size_t key_length +); + +typedef struct OlmInboundGroupSession OlmInboundGroupSession; + +/** get the size of an inbound group session, in bytes. */ +size_t olm_inbound_group_session_size(); + +/** + * Initialise an inbound group session object using the supplied memory + * The supplied memory should be at least olm_inbound_group_session_size() + * bytes. + */ +OlmInboundGroupSession * olm_inbound_group_session( + void *memory +); + +/** + * A null terminated string describing the most recent error to happen to a + * group session */ +const char *olm_inbound_group_session_last_error( + const OlmInboundGroupSession *session +); + +/** Clears the memory used to back this group session */ +size_t olm_clear_inbound_group_session( + OlmInboundGroupSession *session +); + +/** Returns the number of bytes needed to store an inbound group session */ +size_t olm_pickle_inbound_group_session_length( + const OlmInboundGroupSession *session +); + +/** + * Stores a group session as a base64 string. Encrypts the session using the + * supplied key. Returns the length of the session on success. + * + * Returns olm_error() on failure. If the pickle output buffer + * is smaller than olm_pickle_inbound_group_session_length() then + * olm_inbound_group_session_last_error() will be "OUTPUT_BUFFER_TOO_SMALL" + */ +size_t olm_pickle_inbound_group_session( + OlmInboundGroupSession *session, + void const * key, size_t key_length, + void * pickled, size_t pickled_length +); + +/** + * Loads a group session from a pickled base64 string. Decrypts the session + * using the supplied key. + * + * Returns olm_error() on failure. If the key doesn't match the one used to + * encrypt the account then olm_inbound_group_session_last_error() will be + * "BAD_ACCOUNT_KEY". If the base64 couldn't be decoded then + * olm_inbound_group_session_last_error() will be "INVALID_BASE64". The input + * pickled buffer is destroyed + */ +size_t olm_unpickle_inbound_group_session( + OlmInboundGroupSession *session, + void const * key, size_t key_length, + void * pickled, size_t pickled_length +); + + +/** + * Start a new inbound group session, from a key exported from + * olm_outbound_group_session_key + * + * Returns olm_error() on failure. On failure last_error will be set with an + * error code. The last_error will be: + * + * * OLM_INVALID_BASE64 if the session_key is not valid base64 + * * OLM_BAD_SESSION_KEY if the session_key is invalid + */ +size_t olm_init_inbound_group_session( + OlmInboundGroupSession *session, + /* base64-encoded keys */ + uint8_t const * session_key, size_t session_key_length +); + +/** + * Import an inbound group session, from a previous export. + * + * Returns olm_error() on failure. On failure last_error will be set with an + * error code. The last_error will be: + * + * * OLM_INVALID_BASE64 if the session_key is not valid base64 + * * OLM_BAD_SESSION_KEY if the session_key is invalid + */ +size_t olm_import_inbound_group_session( + OlmInboundGroupSession *session, + /* base64-encoded keys; note that it will be overwritten with the base64-decoded + data. */ + uint8_t const * session_key, size_t session_key_length +); + + +/** + * Get an upper bound on the number of bytes of plain-text the decrypt method + * will write for a given input message length. The actual size could be + * different due to padding. + * + * The input message buffer is destroyed. + * + * Returns olm_error() on failure. + */ +size_t olm_group_decrypt_max_plaintext_length( + OlmInboundGroupSession *session, + uint8_t * message, size_t message_length +); + +/** + * Decrypt a message. + * + * The input message buffer is destroyed. + * + * Returns the length of the decrypted plain-text, or olm_error() on failure. + * + * On failure last_error will be set with an error code. The last_error will + * be: + * * OLM_OUTPUT_BUFFER_TOO_SMALL if the plain-text buffer is too small + * * OLM_INVALID_BASE64 if the message is not valid base-64 + * * OLM_BAD_MESSAGE_VERSION if the message was encrypted with an unsupported + * version of the protocol + * * OLM_BAD_MESSAGE_FORMAT if the message headers could not be decoded + * * OLM_BAD_MESSAGE_MAC if the message could not be verified + * * OLM_UNKNOWN_MESSAGE_INDEX if we do not have a session key corresponding to the + * message's index (ie, it was sent before the session key was shared with + * us) + */ +size_t olm_group_decrypt( + OlmInboundGroupSession *session, + + /* input; note that it will be overwritten with the base64-decoded + message. */ + uint8_t * message, size_t message_length, + + /* output */ + uint8_t * plaintext, size_t max_plaintext_length, + uint32_t * message_index +); + + +/** + * Get the number of bytes returned by olm_inbound_group_session_id() + */ +size_t olm_inbound_group_session_id_length( + const OlmInboundGroupSession *session +); + +/** + * Get a base64-encoded identifier for this session. + * + * Returns the length of the session id on success or olm_error() on + * failure. On failure last_error will be set with an error code. The + * last_error will be OUTPUT_BUFFER_TOO_SMALL if the id buffer was too + * small. + */ +size_t olm_inbound_group_session_id( + OlmInboundGroupSession *session, + uint8_t * id, size_t id_length +); + +/** + * Get the first message index we know how to decrypt. + */ +uint32_t olm_inbound_group_session_first_known_index( + const OlmInboundGroupSession *session +); + + +/** + * Check if the session has been verified as a valid session. + * + * (A session is verified either because the original session share was signed, + * or because we have subsequently successfully decrypted a message.) + * + * This is mainly intended for the unit tests, currently. + */ +int olm_inbound_group_session_is_verified( + const OlmInboundGroupSession *session +); + +/** + * Get the number of bytes returned by olm_export_inbound_group_session() + */ +size_t olm_export_inbound_group_session_length( + const OlmInboundGroupSession *session +); + +/** + * Export the base64-encoded ratchet key for this session, at the given index, + * in a format which can be used by olm_import_inbound_group_session + * + * Returns the length of the ratchet key on success or olm_error() on + * failure. On failure last_error will be set with an error code. The + * last_error will be: + * * OUTPUT_BUFFER_TOO_SMALL if the buffer was too small + * * OLM_UNKNOWN_MESSAGE_INDEX if we do not have a session key corresponding to the + * given index (ie, it was sent before the session key was shared with + * us) + */ +size_t olm_export_inbound_group_session( + OlmInboundGroupSession *session, + uint8_t * key, size_t key_length, uint32_t message_index +); |