Initial revision

git-svn-id: https://svn.code.sf.net/p/jode/code/trunk@389 379699f6-c40d-0410-875b-85095c16579e

jode/test/ObfuscateStrings.j

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+; This class contains a hand optimized (and hard to decompile) 
+; string obfuscating method.  Maybe I will use it in the Obfuscator
+; some day, but probably the decompiler will handle those string, too.
+
+.class public jode/test/ObfuscateStrings
+.super java/lang/Object
+
+.method private static obf(Ljava/lang/String;)Ljava/lang/String;
+	.limit locals 2
+	.limit stack 7
+	aload_0
+	invokevirtual java/lang/String/toCharArray()[C
+	dup
+	iconst_0
+	ldc 0x12345678
+	goto firstloop
+
+loopstart:
+;  next pseudo random
+;  char array
+	dup_x1
+	swap
+	iload_1
+	swap
+	ldc 0x7fffffff
+	iand
+
+firstloop:
+;stack content:
+;  char array
+;  char array copy
+;  current index
+;  current pseudo random
+
+	ldc 1103515245
+	imul
+	sipush 12345
+	iadd
+	dup_x2
+	sipush 0xff
+	iand
+	dup_x2
+	pop
+	
+;stack content:
+;  char array
+;  next pseudo random
+;  xor mask
+;  char array copy
+;  current index
+
+	dup2_x1
+
+;stack content:
+;  char array
+;  next pseudo random
+;  char array copy
+;  current index
+;  xor mask
+;  char array copy
+;  current index
+
+	caload
+	ixor
+
+;stack content:
+;  char array
+;  next pseudo random
+;  char array copy
+;  current index
+;  new char
+
+	swap
+	dup_x1
+	istore_1
+	iinc 1 1
+	castore
+
+;stack content:
+;  char array
+;  next pseudo random
+;locals:  1 = current index
+	
+	swap
+	dup
+	arraylength
+	iload_1
+	if_icmpne loopstart
+
+	new java/lang/String
+	dup_x2
+	swap
+	invokespecial java/lang/String/<init>([C)V
+	pop
+	areturn
+.end method
+
+.method private static obf2(Ljava/lang/String;)Ljava/lang/String;
+	.limit locals 2
+	.limit stack 8
+	aload_0
+	invokevirtual java/lang/String/toCharArray()[C
+	ldc 0x12345678
+	istore_1
+	iconst_0
+
+loop:
+;  char array
+;  next index
+
+
+;stack content:
+;  char array
+;  current index
+	dup2
+	dup2
+	caload
+
+;  char array
+;  current index
+;  char array
+;  current index
+;  original char
+
+	iload_1
+	ldc 0x7fffffff
+	iand
+
+	dup
+	ldc 1103515245
+	imul
+	sipush 12345
+	iadd
+	istore_1
+	sipush 0xff
+	iand
+	ixor
+
+;  char array
+;  current index
+;  char array
+;  current index
+;  new char
+
+	castore
+	iconst_1
+	iadd
+
+;  char array
+;  next index
+	dup2
+	swap
+	arraylength
+	if_icmplt loop
+	
+;  char array
+;  next index
+	pop
+
+	new java/lang/String
+	dup_x1
+	swap
+	invokespecial java/lang/String/<init>([C)V
+	areturn
+.end method
+