I'm a bit clueless on the crypto front, but as for operating on a string as though it were a file you can always use IO::Scalar, or if you're working with perl5.8.0, just use the new functionality of open e.g 
# using IO::Scalar

tie *FH, 'IO::Scalar', \my $str = $somenumber;

# using open()

open(my $fh, '<', \my $str = $somenumber);

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HTH

_________
broquaint

In reply to Re: Using Asymmetric keys for Encryption by broquaint
in thread Using Asymmetric keys for Encryption by fuzzyping

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