AUTOSAR E2E CRC guide

AUTOSAR End-to-End (E2E) Protection wraps signals exchanged between ECUs with a CRC, a sequence counter, and sometimes a data ID, to detect corruption, loss, repetition, and misrouting introduced by the communication stack rather than just the physical layer.

AUTOSAR standardizes its own CRC parameter sets — CRC-8/AUTOSAR and CRC-32/AUTOSAR — separate from the CRC-8 and CRC-32 models used elsewhere, so an E2E-protected signal will not validate against a generic CRC-8 or CRC-32/ISO-HDLC implementation.

Width 8, polynomial 0x2F, initial value 0xFF, final XOR 0xFF, no input or output reflection. Check value for 123456789 is 0xDF.

This profile is typically used for short signals where an 8-bit CRC provides adequate protection within the E2E profile's configured window.

Width 32, polynomial 0xF4ACFB13, initial value 0xFFFFFFFF, final XOR 0xFFFFFFFF, both input and output reflected. Check value for 123456789 is 0x1697D06A.

This is a distinct polynomial from CRC-32/ISO-HDLC (Ethernet) and CRC-32/BZIP2, chosen for its error-detection properties over typical AUTOSAR PDU lengths — do not substitute the Ethernet CRC-32 polynomial when validating E2E-protected data.

CRC-8/AUTOSAR and CRC-32/AUTOSAR are defined by the AUTOSAR consortium's own specifications — the CRC library specification and the End-to-End Communication Protection Library / E2E Protocol specifications, published at autosar.org — rather than by a general-purpose CRC standard. Both parameter sets are cross-referenced against the Catalogue of CRC Algorithms (reveng.sourceforge.io) for width, polynomial, initial value, reflection, and check value.