[NTG-context] SHA calculation

Pablo Rodriguez oinos at gmx.es
Sun Aug 28 19:07:07 CEST 2022


On 8/28/22 12:25, Hans van der Meer via ntg-context wrote:
>
> With \directlua{context(md5.hex([===[#1]===]))} I can calculate the MD5
> checksum. 
> I thought there was another call for the calculation of the SHA
> checksum, but I could not find it in the documentation or on the context
> garden. 
> Where to look?

Dear dr. van der Meer,

it is my fault since Hans explained this before (to me).

Here you have the minimal sample:

  \ctxlua{require("util-sha")}

  \def\shatwo#1{%
    \cldcontext{utilities.sha2.hash256("#1")}}

  \def\shafive#1{%
    \cldcontext{utilities.sha2.hash512("#1")}}

  \def\shatwofile#1{%
    \cldcontext{utilities.sha2.hash256(io.loaddata("#1"))}}

  \def\shafivefile#1{%
    \cldcontext{utilities.sha2.hash512(io.loaddata("#1"))}}

  \starttext
  \def\testtext{abc}
  \def\testfile{xml-mkiv.pdf}

  \shatwo{\testtext}\\
  \shafive{\testtext}

  \shatwofile{\testfile}\\
  \shafivefile{\testfile}
  \stoptext

Would you be so kind to add it to the wiki?

I hope it may help,

Pablo


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