Obfuscate integer and/or string literals (such as 42 or "42"). Literal integers can be replaced with opaque expressions, which requires that the InitOpaque transformation has been previously issued. Literal strings can be replaced with a function that generates them at runtime.
Options
Option | Arguments | Description |
---|---|---|
--Transform | EncodeLiterals | Replace literal integers and strings with less obvious expressions. |
--EncodeLiteralsKinds | integer, string, * | Specify the types of literals to encode Default=integer,string.
|
--EncodeLiteralsEncoderName | string | The name of the generated encoder function (only for encoded strings). Default=None. |
Examples
Obfuscate Literals |
---|
Replace literal integers with opaque expressions. |
tigress --Environment=x86_64:Darwin:Clang:5.1 --Verbosity=1 \ --Transform=InitOpaque --Functions=main \ --Transform=EncodeLiterals --Functions=\* \ --Transform=CleanUp --CleanUpKinds=annotations \ --out=gen/obfuscateLiterals.c test1.c |
test1.c ⇒ obfuscateLiterals.sh.txt ⇒ obfuscateLiterals.c |
Issues
Note that the generated string encoding function is trivial, by design. To be made less conspicuous, it should itself be transformed, for example using the Virtualize transformation (to hide the string contents) and the RndArgs transformation (to hide the interface).