pylibsrtp

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What is pylibsrtp?

pylibsrtp is a Python wrapper around libsrtp_, making it possible to encrypt and decrypt Secure Real-time Transport Protocol (SRTP) packets from Python code.

SRTP is a profile of the Real-time Transport Protocol (RTP) which provides confidentiality, message authentication, and replay protection. It is defined by RFC 3711_.

You can install pylibsrtp with pip:

.. code-block:: console

$ pip install pylibsrtp

To learn more about pylibsrtp please read the documentation_.

.. _libsrtp: https://github.com/cisco/libsrtp

.. _RFC 3711: https://tools.ietf.org/html/rfc3711

.. _read the documentation: https://pylibsrtp.readthedocs.io/en/stable/

Example

.. code:: python

#!/usr/bin/env python

from pylibsrtp import Policy, Session

key = (b'\x00' * 30)
rtp = b'\x80\x08\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00' + (b'\xd4' * 160)

# protect RTP
tx_policy = Policy(key=key, ssrc_type=Policy.SSRC_ANY_OUTBOUND)
tx_session = Session(policy=tx_policy)
srtp = tx_session.protect(rtp)

# unprotect RTP
rx_policy = Policy(key=key, ssrc_type=Policy.SSRC_ANY_INBOUND)
rx_session = Session(policy=rx_policy)
rtp2 = rx_session.unprotect(srtp)

# check roundtrip worked!
assert rtp2 == rtp

Building pylibsrtp

If you wish to build pylibsrtp yourself, you will need libsrtp version 2.0 or better.

On Debian/Ubuntu run:

.. code-block:: console

$ apt install libsrtp2-dev

On Fedora/CentOS run:

.. code-block:: console

$ dnf install libsrtp-devel

On OS X run:

.. code-block:: console

$ brew install srtp

License

pylibsrtp is released under the BSD license_.

.. _BSD license: https://pylibsrtp.readthedocs.io/en/stable/license.html