gchq
Fletcher's Checksum algorithm implementation looks wrong
Describe the bug The Fletcher's Algorithm results does not match the validation values that can be found in the Wikipedia article about the algorithm (I validated by implementing the algorithm myself) for Fletcher-32 and Fletcher-64.
Steps To Reproduce Just use the Fletcher-32 and Fletcher-64 for the input "abcdefgh".
Expected behaviour
The Fletcher-32 for "abcdefgh" should be 3957429649 (0xEBE19591).
The Fletcher-64 for "abcdefgh" should be 3543817411021686982 (0x312E2B28CCCAC8C6).
Screenshots I don't think it's needed. Please let me know if it's needed.
Desktop (if relevant, please complete the following information):
- OS: Windows 10
- Browser: Edge (Chromium)
- CyberChef version: 9.32.3 (current online version)
Additional context Please let me know if additional context is needed.
Hmmm, it looks like each bytes are added instead of 16-bit or 32-bit blocks as specified in Wikipedia.
From Hex, Fletcher-32 Checksum - CyberChef
