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v0
gno.land/r/moul/x/daily/crc32demo/v0
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CRC-32
The IEEE checksum behind zip, gzip and PNG, demoing the p/moul/x/daily/crc32 library.
| input | crc32 |
|---|---|
| (empty) | 00000000 |
a | e8b7be43 |
abc | 352441c2 |
123456789 | cbf43926 |
hello world | 0d4a1185 |
hello worle | 7a4d2113 |
123456789 → cbf43926 is the standard CRC-32 check value, so this table doubles as a conformance test.
The last two rows differ by one letter and share no digits: that avalanche is the point.
A CRC detects accidents, not tampering — it is linear, so a matching message is easy to craft. Never authenticate with it.
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