Uudecode -o filename.bsdiff < Īt which point you will have obtained the filename.bsdiff file. This can be performed in a terminal by issuing: In order to patch filename, you will first have to decode in order to obtain the filename.bsdiff. The uue extension indicating an universal encoded file (using uuencode), and: For example, the patch for filename would be pasted in a file called: Patches are named in this namespace conventionally and you will need to copy & paste the gibberish text in files before applying them. In case you have access and assuming you have Homebrew install, issue in a terminal: Most of the cracks presented here are for OSX and you will need either MacPorts or Homebrew to apply the patches. We can NOP the CMP as well, if we want to be tidy, but it is not needed.īsdiff can be used to create and apply binary patches. Xor cl, cl read (exchange) cmp rax, rbx compare nop no more jumping nop mov cl, 0x1 continue. īy substituting the jump using some NOPs (no operation): Xor cl, cl read (exchange) cmp rax, rbx compare jle 0x10001FF07 jump mov cl, 0x1 continue. The most obvious, given the top-down flow of execution, is to get rid of the jump ( jle): There are many ways to eliminate the jump in assembler. It does not matter whether reg holds the value 1 or not because the program will never return: Int reg = isRegistered ( ) // read if (reg != 1 ) Better illustrated, let's take the code from the flow-chart above: Manipulating if-branches consists in negating either of the branches in order to favour in outcome.
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