https://github.com/karpeleslab/crc32itu

ITU I.363.5 CRC32
https://github.com/karpeleslab/crc32itu

Last synced: 11 months ago
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ITU I.363.5 CRC32

• Host: GitHub
• URL: https://github.com/karpeleslab/crc32itu
• Owner: KarpelesLab
• License: bsd-3-clause
• Created: 2022-05-26T21:50:21.000Z (about 4 years ago)
• Default Branch: main
• Last Pushed: 2022-05-26T22:03:11.000Z (about 4 years ago)
• Last Synced: 2025-07-01T00:09:08.197Z (12 months ago)
• Language: Go
• Size: 4.88 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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# crc32 ITU

ITU I.363.5 algorithm (a.k.a. AAL5 CRC) was popularised by BZIP2 but also used in ATM transmissions.

This is not implemented in golang's `hash/crc32` package, but can be found hidden in `compress/bzip2` and is the equivalent of PHP's `hash('crc32', ...)`.

the algorithm is the same as that in POSIX 1003.2-1992 in Cksum but that stuffs the size into the CRC at the end for extra measure.