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166 lines
2.1 KiB
166 lines
2.1 KiB
; This class contains a hand optimized (and hard to decompile)
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; string obfuscating method. Maybe I will use it in the Obfuscator
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; some day, but probably the decompiler will handle those string, too.
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.class public ObfuscateStrings
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.super java/lang/Object
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.method private static obf(Ljava/lang/String;)Ljava/lang/String;
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.limit locals 1
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.limit stack 7
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aload_0
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invokevirtual java/lang/String/toCharArray()[C
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dup
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iconst_0
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ldc 0x12345678
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goto firstloop
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loopstart:
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; next pseudo random
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; char array
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dup_x1
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swap
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iload_0
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swap
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ldc 0x7fffffff
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iand
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firstloop:
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;stack content:
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; char array
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; char array copy
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; current index
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; current pseudo random
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ldc 1103515245
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imul
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sipush 12345
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iadd
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dup_x2
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sipush 0xff
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iand
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dup_x2
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pop
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;stack content:
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; char array
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; next pseudo random
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; xor mask
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; char array copy
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; current index
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dup2_x1
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;stack content:
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; char array
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; next pseudo random
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; char array copy
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; current index
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; xor mask
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; char array copy
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; current index
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caload
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ixor
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;stack content:
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; char array
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; next pseudo random
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; char array copy
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; current index
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; new char
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swap
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dup_x1
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istore_0
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iinc 0 1
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castore
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;stack content:
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; char array
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; next pseudo random
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;locals: 1 = current index
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swap
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dup
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arraylength
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iload_0
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if_icmpne loopstart
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new java/lang/String
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dup_x2
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swap
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invokespecial java/lang/String/<init>([C)V
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pop
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areturn
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.end method
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.method private static obf2(Ljava/lang/String;)Ljava/lang/String;
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.limit locals 1
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.limit stack 8
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aload_0
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invokevirtual java/lang/String/toCharArray()[C
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ldc 0x12345678
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istore_0
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iconst_0
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loop:
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; char array
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; next index
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;stack content:
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; char array
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; current index
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dup2
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dup2
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caload
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; char array
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; current index
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; char array
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; current index
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; original char
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iload_0
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ldc 0x7fffffff
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iand
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dup
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ldc 1103515245
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imul
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sipush 12345
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iadd
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istore_0
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sipush 0xff
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iand
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ixor
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; char array
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; current index
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; char array
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; current index
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; new char
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castore
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iconst_1
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iadd
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; char array
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; next index
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dup2
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swap
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arraylength
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if_icmplt loop
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; char array
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; next index
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pop
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new java/lang/String
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dup_x1
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swap
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invokespecial java/lang/String/<init>([C)V
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areturn
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.end method
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