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Marco: besides coding in Red/System, I don't see what you could do 
currently to speed it up. Here are some ideas for the additional 
coding that will need to be done:


You can write in Red/System some of the non-trivial natives, like 
e.g. set natives: sort, union, intersect, unique, difference. Other 
natives or support code we will need are codecs for:

- compression supporting these algorithms: deflate, lzo

- cryptography: MD5, SHA-1, AES, ...(all the required ones for SSH 
and SSL support)


You can port C code to Red/System, there are tons of available C 
source code, you just have to make it right (crypto requires accurate 
coding, implementations need to be deeply tested for flaws).

Provisional SHA-2 implementation, https://github.com/0branch/r3/commits/sha2-experimental

>> checksum/method to-binary "A simple SHA-2 test." 'sha256

== #{E57EBDB51368F9A7ACE63E115193AEAD5E377742E0B4CD6B735CF5AAD49E67EB}

Well almost complete this filesharing... If there would be a nice 
Password protection possible on shared files (Like the SHA exmaple 
from Carls Cookbook) the filesharing would be complete upto the level 
of privicy ...

This is BSD C code for SHA 224 - 512 ... can someone review this 
to see if we can include in 2.7.8 ?

sha_input: http://www.distlab.dk/mysql-4.1/html/mysys_2sha1_8c-source.html#l00179

Seems the two inputs are like a join. Usefull this way if one hashes 
files withput loading everything in memory.

rondon,

you have to check that the choosen encryption scheme is compatible 
on both sides. at least SHA-1 / MD5 should work.

here you have some javasript routines:
	http://www.movable-type.co.uk/scripts/sha1.html
	http://pajhome.org.uk/crypt/md5/index.html

howto rebol:
http://www.rebol.com/docs/words/wchecksum.html


just send some test data and adjust the encryption scheme at the 
javasript side.

with luck, the rebol implementation is suitable for the routines 
above.

Graham: I was able to implement TLS1.0 protocol configured to use 
the TLS_RSA_WITH_RC4_128_SHA cipher-suite. All the mentioned algorithms 
were calculated using the  build-in Rebol2 encryption functionality. 
I had no problems regarding the compatibility. I haven't tried the 
cipher-suite with the AES enctryption though but my guess it will 
work as well.

seems, that digital signatures are becoming quite insecure these 
days http://www.secureworks.com/research/blog/index.php/2009/6/3/sha-1-collision-attacks-now-252/

which sha-2 do you need?

It doesn't matter .. sha-256 is good

Checksum/secure is SHA-1

checksum/secure is a SHA-1 hash.....Hashes are not decryptable, but 
you should find other tools that can produce a SHA-1 hash.