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From: Niklas Holsti <niklas.holsti@tidorum.invalid>
Newsgroups: comp.lang.ada
Subject: Re: GNAT.SHA256 produces result different from sha257sum on Linux
Date: Sat, 4 Nov 2023 18:49:58 +0200
Organization: Tidorum Ltd
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On 2023-11-04 17:09, Jeffrey R.Carter wrote:
> On 2023-11-04 15:39, wvxvw wrote:
>>
>> ❯ ./bin/test_sha --arg foo
>> 2c26b46b68ffc68ff99b453c1d30413413422d706483bfa0f98a5e886266e7ae
>> ❯ echo foo | sha256sum -
>> b5bb9d8014a0f9b1d61e21e796d78dccdf1352f23cd32812f4850b878ae4944c  -
> 
> I think the problem may be that echo adds an LF:
> 
> $ echo foo | hd
> 00000000  66 6f 6f 0a                                       |foo.|
> 
> Since sha256sum expects to work on arbitrary files, it would include the 
> LF in its input.


Some implementations of "echo" accept an option "-n" to suppress the 
trailing newline (LF). The OP could try that option as a quick check of 
this answer (which seems very plausible).