Module checksum 

Frame checksums.

The Checksum trait describes an integrity check that produces a fixed number of bytes. Three common CRCs are built in, implemented locally with const-generated lookup tables (slice-by-8 for the CRC-32 variants) so the crate stays dependency-free:

Type	Algorithm (catalogue name)	Width	Typical use
Crc16CcittFalse	CRC-16/IBM-3740 (a.k.a. CRC-16/CCITT-FALSE)	2 bytes	Serial links, Bluetooth, many embedded protocols
Crc32	CRC-32/ISO-HDLC (IEEE 802.3, zlib, PNG)	4 bytes	Ethernet, gzip, general purpose
Crc32c	CRC-32/ISCSI (Castagnoli)	4 bytes	iSCSI, SCTP, ext4, Kafka record batches

Pair a checksum with any framer through Checksummed. Implement Checksum yourself to plug in a different algorithm (for example a hardware CRC unit on a microcontroller).

A CRC detects accidental corruption. It is not a MAC: anyone can compute a valid CRC for forged data. Use an authenticated cipher or a keyed MAC when the peer is adversarial.

Structs

Crc32

CRC-32/ISO-HDLC, the CRC-32 of IEEE 802.3, zlib, gzip, and PNG.

Crc16CcittFalse

CRC-16/IBM-3740, widely known as CRC-16/CCITT-FALSE.

Crc32c

CRC-32/ISCSI (Castagnoli), used by iSCSI, SCTP, ext4, and Kafka.

Traits

Checksum

An integrity check over a byte slice that yields Checksum::LEN bytes.

Functions

crc32

Compute CRC-32/ISO-HDLC (IEEE) of data.

crc16_ccitt_false

Compute CRC-16/IBM-3740 (CRC-16/CCITT-FALSE) of data.

crc32c

Compute CRC-32/ISCSI (Castagnoli) of data.