I decided to unroll that loop to some extent and manually create one of the functions, sha256, as follows:
sub sha256
{
my $state = _shaopen('256') or return;
for (@_) { _shawrite($_, length($_) << 3, $state) }
_shafinish($state);
_sha($state);
}
push(@EXPORT_OK, 'sha256');
For whatever reason, this works fine, but the generation of the function and export does not.
I'll report back if I figure out exactly why this is happening, but for now I am content with having it work with the functions I need hard-coded in.
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