Techniques are disclosed relating to implementation of LDPC encoding circuitry on a single integrated circuit (IC). In some embodiments, circuitry on a single IC includes message circuitry configured to receive or generate a message to be encoded, encode circuitry configured to perform low density parity check (LDPC) encoding on the message, noise circuitry configured to apply noise to the encoded message, and decode circuitry configured to perform LDPC decoding of the message. In some embodiments, the disclosed techniques may reduce production costs (e.g., by reducing overall chip area), facilitate LDPC testing, and/or provide multiple different functions relating to message transmission on a single chip.