Skylot
61 lines
1.4 KiB
Kotlin
61 lines
1.4 KiB
Kotlin
/**
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* Replace method call with calculated result.
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* Useful for custom string deobfuscation.
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*
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* Example for sample from issue https://github.com/skylot/jadx/issues/1251
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*/
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import jadx.core.dex.instructions.ConstStringNode
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import jadx.core.dex.instructions.InvokeNode
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import jadx.core.dex.instructions.args.InsnArg
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import jadx.core.dex.instructions.args.InsnWrapArg
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import jadx.core.dex.instructions.args.RegisterArg
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val jadx = getJadxInstance()
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val mthSignature = "com.xshield.aa.iIiIiiiiII(Ljava/lang/String;)Ljava/lang/String;"
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jadx.replace.insns { mth, insn ->
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if (insn is InvokeNode && insn.callMth.rawFullId == mthSignature) {
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val str = getConstStr(insn.getArg(0))
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if (str != null) {
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val resultStr = decode(str)
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log.info { "Decode '$str' to '$resultStr' in $mth" }
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return@insns ConstStringNode(resultStr)
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}
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}
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null
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}
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fun getConstStr(arg: InsnArg): String? {
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val insn = when (arg) {
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is InsnWrapArg -> arg.wrapInsn
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is RegisterArg -> arg.assignInsn
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else -> null
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}
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if (insn is ConstStringNode) {
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return insn.string
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}
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return null
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}
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/**
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* Decompiled method, automatically converted to Kotlin by IntelliJ Idea
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*/
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fun decode(str: String): String {
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val length = str.length
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val cArr = CharArray(length)
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var i = length - 1
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while (i >= 0) {
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val i2 = i - 1
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cArr[i] = (str[i].code xor 'z'.code).toChar()
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if (i2 < 0) {
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break
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}
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i = i2 - 1
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cArr[i2] = (str[i2].code xor '\u000c'.code).toChar()
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}
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return String(cArr)
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}
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