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<blockquote data-quote="Cyan" data-source="post: 5137839" data-attributes="member: 746"><p>Thanks Falo and Stormyu.</p><p>Making a program to decrypt the ISO without using the PSP would be even easier for the end user. I don't know if it's possible, all decrypters I saw are homebrew.</p><p></p><p>I don't know what PDATA.EDAT contains (I didn't check that game's content), but if your patch is 2MB that's fine I guess.</p><p></p><p></p><p></p><p>Luckymouse : </p><p>You can't apply a patch on a different data than the one you used to "compare" the versions to create the patch.</p><p>a patch is the difference between two files.</p><p></p><p>123456789 <- original decrypted</p><p>12<strong>0</strong>45<strong>0</strong>789 <- patched version (decrypted)</p><p></p><p>The patch contains instruction like this "replace 3rd position with 0, replace 6th position with 0". (note: the patch is small : only 2 characters to replace)</p><p></p><p>if the encrypted file is :</p><p>Agv58Dhfr <-- encrypted original</p><p></p><p>Then you can't apply the patch, because it will replace 3rd and 6th position with "0" :</p><p>Ag<strong>0</strong>58<strong>0</strong>hfr <-- encrypted patch applied</p><p></p><p>and the game will not work anymore because the encrypted data will be corrupted and can't be decrypted anymore by the console.</p><p></p><p></p><p>If you create a patch by comparing the encrypted version with the decrypted version : </p><p>Agv58Dhfr <- encrypted</p><p>120450789 <- decrypted + patched</p><p>Then the patch will contains instruction like this : "replace 1st to 9th position with 120450789" (note: the patch is big : it contains 9 characters to replace instead of only 2, that's why you ended with a 600MB patch)</p><p>Patch created this way contains original ISO data too (12, 45, 789) while it could contains only the "modified by the translation team" data.</p></blockquote><p></p>
[QUOTE="Cyan, post: 5137839, member: 746"] Thanks Falo and Stormyu. Making a program to decrypt the ISO without using the PSP would be even easier for the end user. I don't know if it's possible, all decrypters I saw are homebrew. I don't know what PDATA.EDAT contains (I didn't check that game's content), but if your patch is 2MB that's fine I guess. Luckymouse : You can't apply a patch on a different data than the one you used to "compare" the versions to create the patch. a patch is the difference between two files. 123456789 <- original decrypted 12[b]0[/b]45[b]0[/b]789 <- patched version (decrypted) The patch contains instruction like this "replace 3rd position with 0, replace 6th position with 0". (note: the patch is small : only 2 characters to replace) if the encrypted file is : Agv58Dhfr <-- encrypted original Then you can't apply the patch, because it will replace 3rd and 6th position with "0" : Ag[b]0[/b]58[b]0[/b]hfr <-- encrypted patch applied and the game will not work anymore because the encrypted data will be corrupted and can't be decrypted anymore by the console. If you create a patch by comparing the encrypted version with the decrypted version : Agv58Dhfr <- encrypted 120450789 <- decrypted + patched Then the patch will contains instruction like this : "replace 1st to 9th position with 120450789" (note: the patch is big : it contains 9 characters to replace instead of only 2, that's why you ended with a 600MB patch) Patch created this way contains original ISO data too (12, 45, 789) while it could contains only the "modified by the translation team" data. [/QUOTE]
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