https://github.com/bodgit/crc32

Golang library to manipulate CRC-32 checksum values
https://github.com/bodgit/crc32

crc crc-calculation crc32 golang golang-library

Last synced: 6 months ago
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Golang library to manipulate CRC-32 checksum values

• Host: GitHub
• URL: https://github.com/bodgit/crc32
• Owner: bodgit
• License: bsd-3-clause
• Created: 2020-08-25T22:42:37.000Z (about 5 years ago)
• Default Branch: main
• Last Pushed: 2024-05-07T20:00:12.000Z (over 1 year ago)
• Last Synced: 2025-02-13T02:18:17.438Z (8 months ago)
• Topics: crc, crc-calculation, crc32, golang, golang-library
• Language: Go
• Homepage: https://godoc.org/github.com/bodgit/crc32
• Size: 22.5 KB
• Stars: 1
• Watchers: 3
• Forks: 0
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • License: LICENSE

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crc32

=====

An implementation of an algorithm to modify a file so that its CRC-32 checksum

matches a given value. This requires four sacrificial bytes in the file that

will be modified to generate the desired value. A small example:

```golang

f, err := os.OpenFile("somefile", O_RDWR, 0) // Remember to open read/write!

if err != nil {

        log.Fatal(err)

}

defer f.Close()

if err := crc32.ForceCRC32(f, 0, 0xdeadbeef); err != nil {

        log.Fatal(err)

}

```

In this example the first four bytes in `somefile` will be modified so that

the CRC-32 checksum of `somefile` will be `0xdeadbeef` however the bytes can

be anywhere in the file, but must be contiguous.