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Old 01-08-2003, 10:02 AM   #1
darkone
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Default Transfer encryption

Aah, Yes.. I finally had time to write that blowfish encryption for ftp (on win32), which allows secure transfers at very high speeds. (fxp is possible as well)

As I had performance in priority #1 when designing this algorithm, I decided to use two different encryption methods:
1. BF_cbc_encrypt(), which encrypts data in 8byte blocks - used to encrypt/decrypt most of transfer.
2. BF_cfc64_encrypt(), encrypts 1byte at time - used to encrypt/decrypt block at the end of file, if it isn't dividable by 8.

Performance comparison for uploads:
RAW: 50mb/sec (Peak)
BF: 40mb/sec
Downloads:
RAW: 45mb/sec
BF: 45mb/sec


Raw:

ftp> get GAME.REZ nul
200 PORT command successful.
150 Opening BINARY mode data connection for GAME.REZ.
226 [PWD: /pub/games/No One Lives Forever 2/ ]-[Section: Default]-[Credits: -2209.4M]-[Ratio: Unlimited]-[Speed: 43113.7kb/s]
ftp: 224475015 bytes received in 5,09Seconds 44127,19Kbytes/sec.

Blowfish (1 byte key, in secret key algorithms key size doesn't have anything to do with encryption speed):

ftp> quote bfk 1,1
200 Blowfish key set.
ftp> get GAME.REZ nul
200 PORT command successful.
150 Opening BINARY mode data connection for GAME.REZ.
226 [PWD: /pub/games/No One Lives Forever 2/ ]-[Section: Default]-[Credits: -2209.4M]-[Ratio: Unlimited]-[Speed: 43740.1kb/s]
ftp: 224475015 bytes received in 5,01Seconds 44832,24Kbytes/sec.

Valid blowfish implementation must use TLS or SSL control connection as base - secret keys are transfered as plain text via this channel.

I will post documented C examples for non-blocking reading & writing, and better documentation later this week. (Full daemon implementation in C took less than 230lines of commented code & it was done in 7hours).

Any Questions/Comments?
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Old 01-08-2003, 02:05 PM   #2
MxxCon
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what ftpd support this?
and just fyi, in case you didn't know, FlashFXP is written in delphi, so if you implied that FlashFXP can use that code it won't work
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Old 01-09-2003, 02:21 AM   #3
darkone
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Code is very simple.. I'm sure it's nothing these guys couldn't handle.
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Old 01-09-2003, 02:22 AM   #4
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I dont want to advertise my daemon here, try google with my nickname as search parameter
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Old 01-09-2003, 04:10 AM   #5
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http://www.ioftpd.com/~darkone/drafts/FTP-Blowfish.txt

I didn't have time to unoptimise it.. aah, yes you guys have my permission to use it
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blowfish, encryption, ftp, game.rez, key

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