Re: [openpgp] [Technical Errata Reported] RFC4880 (5491)
Heiko Stamer <HeikoStamer@gmx.net> Mon, 10 June 2019 18:11 UTC
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From: Heiko Stamer <HeikoStamer@gmx.net>
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Subject: Re: [openpgp] [Technical Errata Reported] RFC4880 (5491)
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On 08 June 2019 at 16:07, Marco Bellaccini wrote:
>> Original Text
>> -------------
>> #define CRC24_POLY 0x1864CFBL
>>
>> Corrected Text
>> --------------
>> #define CRC24_POLY 0x864CFBL
>>
>> Notes
>> -----
>> In the C reference implementation of CRC-24, the generator is wrong:
Just for the records: The wording "generator is wrong" seems to be a bit
misleading, because the highest degree term of CRC-24-Radix64 polynomial
is x^{24} [1] and the reference implementation takes care of the special
form of the constant. However, as there exists an established
representation for those polynomials [2], the proposed change is at
least of some editorial relevance.
[1] https://en.wikipedia.org/wiki/Cyclic_redundancy_check
[2]
https://en.wikipedia.org/wiki/Mathematics_of_cyclic_redundancy_checks#Polynomial_representations
--
Heiko
- Re: [openpgp] [Technical Errata Reported] RFC4880… Marco Bellaccini
- Re: [openpgp] [Technical Errata Reported] RFC4880… Werner Koch
- Re: [openpgp] [Technical Errata Reported] RFC4880… Heiko Stamer