SHA calculation

SHA calculation

[Hans van der Meer via ntg-context]

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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?

dr. Hans van der Meer



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Re: SHA calculation

[Hans Hagen via ntg-context]

On 8/28/2022 12:25 PM, 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?
have a look at

l-sha.lua

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                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
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Re: SHA calculation

[Pablo Rodriguez via ntg-context]

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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Re: SHA calculation

[Pablo Rodriguez via ntg-context]

On 8/28/22 12:41, Hans Hagen via ntg-context wrote:
> On 8/28/2022 12:25 PM, Hans van der Meer via ntg-context wrote:
>> [...]
>> Where to look?
> have a look at
>
> l-sha.lua

Hans,

I wonder whether https://github.com/Egor-Skriptunoff/pure_lua_SHA may be
interesting for ConTeXt.

I mean, it is optimized for speed. As the author states:

  Main feature of this module: it was heavily optimized for speed.

I think it may be interesting to be considered for ConTeXt.

Just in case it might help,

Pablo
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Re: SHA calculation

[Hans van der Meer via ntg-context]

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> On 28 Aug 2022, at 19:07, Pablo Rodriguez via ntg-context <ntg-context@ntg.nl> wrote:
> 
> 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).
> 

You absolutely need not to apologize. The answer of Hans Hagen was quite sufficient for me and 
\def\SHA#1{\directlua{tex.sprint(sha2.hash256([===[#1]===]))}}
was all I needed. I know Hans from ages ago and he knows what I need in cases like this.

Alas, wikifying is not my thing.

Hans van der Meer\

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