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Old 06-05-2012   #1
concretecork
 
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I am looking for clarification with eboots

I have tried asking this a couple other times, once had a sarcastic answer and the other time ignored, so i figured i would try again and put a little more effort into explaining what i am trying to understand.
First let me start out by saying i can not code. I have just started a free online course as suggested by TizzyT but i can understand more than a normal noob.
I am also not a Pulitzer prize writer and will probably be all over the place, I will do my best.
I had previously posted a question asking the difference between psp and ps3 eboot. The reason being is because I came across a program than wil fix an eboot to play on the psp. If for example I take the psn angry birds game that is fixed for ps3 and unpackage it, I will have the game and the fix. If i take the game and run it through the program for the psp i now have an eboot fixed for the psp. Basically two different fixes for the same exact game.
This is my question. Is there a program to reverse this process? If so what is it? And if not then how hard would it be to compare the eboots to be able to fix for both systems?
Also I understand that this will only work with games that are compatible with both systems. But I have read somewhere that it has been tried with regular psp>ps3 games successfully. And I'm not talking about Cobra. I have more games for psp that are compatible for ps3 and haven't seen them released yet and am just trying to convert them or understand how. Any help would be greatly appreciated. Thanks
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Old 06-05-2012   #2
euss
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I do not not know PSP very well, so this answer will be very restrictive/limited. I do know eboot is used on PSP/PSvita/PS3 as well, but in other fileformats and signing (at least on PS3 they are AES encrypted and ECDSA signed, on PSP they seemed to use Kirk keys for encryption, not sure about signing - afaik on PSvita they also use AES encryption and ECDSA signing just as on PS3).

If you have both originals, and both output files, then you can diff them with HxD/winhex etc. or look them over what code they exactly fix with IDA.
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Old 06-05-2012   #3
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And that is where I am at. I have both files but when i open them in hex viewer i dont understand what im looking at. I understand that both systems sign things differently. But the fix for each system should be the same way each time correct? Signed the same way? If the game will work on both systems then by knowing the differences each game can be converted from one to the other and possibly even fix other psp games to work on ps3. I am bringing this up because i know this is possible there are tools to do this but only a few people have the ps3 tools. I was trying to do it the old fashioned way but guess without the needed coding skills i'm SOL. Thanks @euss for checking this tread out anyway.
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