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In particular, you do not want any overly short names to be added to the lookup table if they are not actually being accessed by unresolved Reflection API calls. Nonetheless, as is mentioned above, it is highly recommended that you tell Zelix KlassMaster which names to add to the lookup table so that it contains as few names as is possible. Zelix KlassMaster will report warnings if overly short names are being added to the lookup table. 11 characters or more) then the hash values are reasonably safe from brute force attack. Provided the original class, field or method names are of a reasonable length (e.g. The other thing to note is that a hash of the original, unobfuscated class, field or method names is stored in the lookup table within the obfuscated bytecode. So it is highly recommended that you tell Zelix KlassMaster which names to add to the looup table by using the ZKM Script accessedByReflectionĪnd/or accessedByReflectionExclude statements. However, because the Reflection API calls are unresolved, Zelix KlassMaster doesn't know which names to add to the lookup table. Your bytecode is then changed to make use of the lookup table so that any original name that would be used in an unresolved Reflection API call is replaced with the corresponding obfuscated name.Ī key thing to note here is that only the names of classes, fields and methods that are actually accessed by unresolved Reflection API calls need to be in the lookup table. The AutoReflection functionality allows the names of such classes, fields and methods to be obfuscated.ĪutoReflection works by creating a lookup table which maps a hash of the original class, field or method names to the corresponding obfuscated name. Had to explicitly exclude from being renamed the name of the class, field or method being accessed by name. Prior to the introduction of the AutoReflection functionality, if you had unresolved Reflection API calls which were being broken by Name Obfuscation, then you In the Zelix KlassMaster log (which is named "ZKM_log.txt" by default) under the heading "API calls detected that may not be handled automatically.". If Zelix KlassMaster cannot fully resolve a Reflection API call then it lists the unresolved call in the Class Open Warnings window if you are using the GUI or Zelix KlassMaster automatically handles resolved Reflection API calls by updating the String literal that holds the class, field or method name to reflect the corresponding obfuscated name. If Zelix KlassMaster can find a String literal which contains the name of the class, field or method then it is said to have "resolved" that call. It automatically looks for the source of the class, field or method name which is being passed to the Reflection API method. When Zelix KlassMaster opens your classes, it detects Java Reflection API calls that access classes, fields or methods and Zelix KlassMaster's basic handling of Java Reflection API calls This means that Name Obfuscation can break Java Reflection API calls. Of course, Name Obfuscation can change the names of classes, fields and methods. The Java Reflection API allows you to access classes, fields or methods by name. The problem presented by Java Reflection API calls
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Zelix KlassMaster's basic handling of Java Reflection API calls.The problem presented by Java Reflection API calls.This tutorial is divided into the following sections: Java Obfuscator - Zelix KlassMaster - AutoReflection Tutorial