From: Konrad Meyer <konrad@...>
Date: 2007-10-31T11:04:53+09:00
Subject: Re: (BitTorrent-related) binary "string" to hexadecimal?

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Quoth Shanti Braford:
> Ok in case anyone is curious, this seems to work...
>=20
> digest_hex =3D digest.unpack('H*')
> # =3D> "0beec7b5ea3f0fdbc95d0dd47f3c5bc275da8a33"
>=20
> http://www.ruby-doc.org/core/classes/String.html#M000775
>=20
> I still have no clue what a "hex nibble" is but it does the trick in a=20
> pinch! =3D)

  Each character in a string from SHA1.digest() is single byte ranging from=
 0=20
to 255. What you want to do is take each byte, and break it into the most=20
significant 4 bits and the least significant 4 bits, and represent each of=
=20
these as a hex nibble. Hence, your "0beece..." string will be twice as long=
,=20
but has the benefit of being human readable (or matching the protocol :D).

  #unpack("H*") is doing what you want, and I'd say it is *not* just a quic=
k=20
hack, but a valid solution to your problem. Good luck and happy rubying.

HTH,
=2D-=20
Konrad Meyer <konrad@tylerc.org> http://konrad.sobertillnoon.com/

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