[tools] tester: Use shorter SHA512 encoding

[Chris Johns]

OK to push

Thanks
Chris

On 10/8/2023 11:52 pm, Sebastian Huber wrote:
> Encode the SHA512 digest in base64urlsafe instead of a hex string to
> reduce the report size.
> ---
>  tester/rt/test.py | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/tester/rt/test.py b/tester/rt/test.py
> index 2b5ad85..0e22002 100644
> --- a/tester/rt/test.py
> +++ b/tester/rt/test.py
> @@ -329,13 +329,14 @@ def generate_yaml_report(args, reports, start_time, end_time,
>  
>  def get_hash512(exe):
>      """ returns SHA512 hash string of a given binary file passed as argument """
> +    import base64
>      import hashlib
>  
>      hash = hashlib.sha512()
>      with open(exe, "rb") as f:
>          for byte_block in iter(lambda: f.read(4096), b""):
>              hash.update(byte_block)
> -    return hash.hexdigest()
> +    return base64.urlsafe_b64encode(hash.digest()).decode("ascii")
>  
>  
>  report_formatters = {