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| 01:47.12 | synic|home | are there any C programmers awake in here? |
| 01:47.51 | Tenebram1 | I have programmed in c before, not sure I'd classify myself as a c programmer. |
| 01:48.11 | synic|home | maybe you can help... I'll try anything. This is driving me crazy. |
| 01:48.17 | synic|home | http://www.rafb.net/efnet_cpp/paste/results/Z2101064.html |
| 01:48.21 | Tenebram1 | 'kay, I'll give it a shot |
| 01:50.10 | Tenebram1 | a little messed up? |
| 01:50.27 | synic|home | they just aren't the characters that went in... |
| 01:51.00 | synic|home | most of the file is ok, it's just the last few characters that seem to have not been decrypted |
| 01:51.06 | synic|home | the in file and out file are exactly the same size |
| 01:51.41 | Tenebram1 | not be decrypted, or are incorrectly decrypted? |
| 01:51.50 | Tenebram1 | are they the same characters as in the encrypted file? |
| 01:52.16 | synic|home | can't really tell. they may just be incorrectly decrypted. |
| 01:53.49 | Tenebram1 | those are rather different issues, I'd suggest checking to see if they're the same or not |
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| 02:18.12 | Tenebram1 | DMDAVIS! |
| 02:18.16 | dmdavis | wuzzup |
| 02:19.23 | dmdavis | what's going on in here? quiet tonight? |
| 02:19.30 | dmdavis | everyone out on hot dates, I hope? |
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| 02:25.04 | dmdavis | hey, anyone here know much about setting up email servers? |
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| 02:56.17 | tensai | synic|home: still here? |
| 02:57.24 | synic|home | tensai, yeah |
| 02:57.35 | tensai | I sorta figured the problem out |
| 02:57.39 | synic|home | oh ? |
| 02:58.29 | tensai | this may take a sec. it's hard to explain... |
| 02:58.47 | synic|home | np |
| 03:00.25 | tensai | basically it's a block alignment problem. you only fwrite size characters rather than a whole block. |
| 03:01.40 | tensai | if you mess with the input data and get it to be an exact block multiple, it works properly as is |
| 03:01.55 | synic|home | hrmm, ok - so I should fwrite all 8 characters then? |
| 03:01.58 | tensai | I got it to work by writing all 8 characters each time |
| 03:01.59 | tensai | yeah |
| 03:02.13 | synic|home | what if I can't read 8 characters from the input file? |
| 03:02.35 | tensai | that's why I said "sorta" :) |
| 03:02.46 | tensai | I padded with a's and got a's in the output |
| 03:03.30 | synic|home | hrmm, so I would have to pad the output file so the blocks match then |
| 03:04.27 | tensai | blowfish works only on 64 bit blocks, so you have to pad with something. The hard part is knowing which part is padding and which isn't. |
| 03:06.11 | synic|home | hrmm. could I pad with '\0' do you think? |
| 03:08.33 | tensai | you can. the hard part is knowing what part of the decrypted data is padding since you don't have the original for comparison. |
| 03:08.47 | synic|home | ah |
| 03:08.50 | tensai | you could write the file size into the stream, say as the first octet |
| 03:09.09 | tensai | or you could have an end of file character |
| 03:09.54 | tensai | you'd have to figure out a way of escaping it since that character could appear normally |
| 03:11.17 | tensai | you could find a nice stream cypher. they handle arbitrary length data. |
| 03:11.32 | Tenebram1 | arcfour comes time mind |
| 03:11.35 | tensai | I don't have Applied Cryptography at hand or I'd recommend one |
| 03:11.48 | synic|home | hrmm... I could maybe save a header in the file that has the length of the file |
| 03:12.59 | tensai | that sounds familiar... :) |
| 03:20.03 | synic|home | tensai, thanks for the information. I'll keep researching it. |
| 03:30.53 | synic|home | wow. It works. |
| 03:33.07 | synic|home | tensai, you were in fact right... I needed to find one that uses streams. |
| 03:33.45 | tensai | what are you using? |
| 03:34.29 | synic|home | BF_cfb64_encrypt() |
| 03:34.41 | synic|home | it's the stream version of the blowfish algorithm |
| 03:37.52 | tensai | cool |
| 03:37.55 | synic|home | nice, it's able to encrypt 126MB in 15 seconds |
| 03:41.41 | synic|home | thanks a bunch. That was really racking my brain |
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| 06:19.49 | Tenebram1 | HARLEYPIG! |
| 06:20.13 | harleypig | Yo! |
| 06:20.36 | Tenebram1 | come to compose more haiku? |
| 06:20.46 | harleypig | Not tonight ... too tired. |
| 06:20.56 | Tenebram1 | oh well |
| 06:21.03 | harleypig | :] |
| 06:21.04 | Tenebram1 | and why is there a "1" after my nick? |
| 06:21.16 | Tenebram1 | I guess I got disconnected while I was out... |
| 06:21.28 | harleypig | Probably. |
| 06:21.46 | Tenebram1 | meh, the "1" looks happy there. I'll leave it for now. |
| 06:22.00 | harleypig | :D |
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| 06:47.43 | Tenebram1 | TORRIEM! |
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