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)
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)