Initial commit

.gitignore

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+.vscode

branching/branching.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+#ifdef SPLIT
+__attribute((__annotate__("split split_num=10"))) void function();
+#endif
+#ifdef CFF
+__attribute((__annotate__("fla"))) void function();
+#endif
+#ifdef INDIR
+__attribute((__annotate__("indibr"))) void function();
+#endif
+
+void function() {
+    srand(time(NULL));
+
+    for (int i = 0; i < 10; i++) {
+        int n = rand() % 100;
+        if (n == 0) {
+            puts("Number is zero!");
+        }
+
+        if (n % 2 == 0) {
+            if (n % 10 == 0) {
+                puts("Number is divisible by 10!");
+            } else {
+                puts("Number is even!");
+            }
+        }
+
+        puts("Number is odd!");
+    }
+}
+
+int main(int argc, char** argv) {
+    function();
+    return 0;
+}

branching/build.sh

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+clang branching.c -o branching -fno-stack-protector -s

branching/build_obf.sh

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+clang branching.c -o split_blocks_obf -fno-stack-protector -s -DSPLIT
+clang branching.c -o cff_obf -fno-stack-protector -s -DCFF
+clang branching.c -o indibr_obf -fno-stack-protector -s -DINDIR

instr_sub/.fibonacci.dot

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+digraph "CFG for 'fibonacci' function" {
+	label="CFG for 'fibonacci' function";
+
+	Node0x564260db1a40 [shape=record,color="#3d50c3ff", style=filled, fillcolor="#b9d0f970",label="{%0}"];
+	Node0x564260db1a40 -> Node0x564260db6500;
+	Node0x564260db6500 [shape=record,color="#b70d28ff", style=filled, fillcolor="#b70d2870",label="{%5|{<s0>T|<s1>F}}"];
+	Node0x564260db6500:s0 -> Node0x564260db6660;
+	Node0x564260db6500:s1 -> Node0x564260db66b0;
+	Node0x564260db6660 [shape=record,color="#b70d28ff", style=filled, fillcolor="#bb1b2c70",label="{%8}"];
+	Node0x564260db6660 -> Node0x564260db80f0;
+	Node0x564260db80f0 [shape=record,color="#b70d28ff", style=filled, fillcolor="#bb1b2c70",label="{%47}"];
+	Node0x564260db80f0 -> Node0x564260db6500;
+	Node0x564260db66b0 [shape=record,color="#3d50c3ff", style=filled, fillcolor="#b9d0f970",label="{%78}"];
+}

instr_sub/.main.dot

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+digraph "CFG for 'main' function" {
+	label="CFG for 'main' function";
+
+	Node0x564260db9be0 [shape=record,color="#b70d28ff", style=filled, fillcolor="#b70d2870",label="{%2}"];
+}

instr_sub/build.sh

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+clang instr_sub.c -o instr_sub -fno-stack-protector -s

instr_sub/build_obf.sh

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+clang instr_sub.c -o instr_sub_obf -fno-stack-protector -s -DOBF

instr_sub/instr_sub.c

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+#include <stdio.h>
+
+#ifdef OBF
+__attribute((__annotate__("sub sub_prob=100 sub_loop=2"))) void fibonacci();
+#endif
+
+void fibonacci() 
+{
+    int a = 0;
+    int b = 1;
+    int c = 1;
+    for (int i = 0; i < 10; i++) 
+    {
+        printf("%d\n", c);
+        c = a + b;
+        a = b;
+        b = c;
+    }
+}
+
+int main(int argc, char** argv) 
+{
+    fibonacci();
+    return 0;
+}

instr_sub/instr_sub.ll

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+; ModuleID = 'instr_sub.c'
+source_filename = "instr_sub.c"
+target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+@.str = private unnamed_addr constant [4 x i8] c"%d\0A\00", align 1
+@.str.1 = private unnamed_addr constant [28 x i8] c"sub sub_prob=100 sub_loop=2\00", section "llvm.metadata"
+@.str.2 = private unnamed_addr constant [12 x i8] c"instr_sub.c\00", section "llvm.metadata"
+@llvm.global.annotations = appending global [1 x { ptr, ptr, ptr, i32, ptr }] [{ ptr, ptr, ptr, i32, ptr } { ptr @fibonacci, ptr @.str.1, ptr @.str.2, i32 7, ptr null }], section "llvm.metadata"
+
+; Function Attrs: noinline nounwind optnone uwtable
+define dso_local void @fibonacci() #0 !MD_obf !6 {
+  %1 = alloca i32, align 4
+  %2 = alloca i32, align 4
+  %3 = alloca i32, align 4
+  %4 = alloca i32, align 4
+  store i32 0, ptr %1, align 4
+  store i32 1, ptr %2, align 4
+  store i32 1, ptr %3, align 4
+  store i32 0, ptr %4, align 4
+  br label %5
+
+5:                                                ; preds = %47, %0
+  %6 = load i32, ptr %4, align 4
+  %7 = icmp slt i32 %6, 10
+  br i1 %7, label %8, label %78
+
+8:                                                ; preds = %5
+  %9 = load i32, ptr %3, align 4
+  %10 = call i32 (ptr, ...) @printf(ptr noundef @.str, i32 noundef %9)
+  %11 = load i32, ptr %1, align 4
+  %12 = load i32, ptr %2, align 4
+  %13 = or i32 %11, %11
+  %14 = xor i32 %13, -1
+  %15 = or i32 %12, %12
+  %16 = xor i32 %15, -1
+  %17 = or i32 %14, %16
+  %18 = xor i32 %17, -1
+  %19 = and i32 %11, %12
+  %20 = xor i32 2, -1
+  %21 = and i32 %18, %20
+  %22 = or i32 %18, %20
+  %23 = xor i32 %22, -1
+  %24 = mul i32 %23, %21
+  %25 = and i32 %18, 2
+  %26 = or i32 %18, 2
+  %27 = mul i32 %26, %25
+  %28 = add i32 %27, %24
+  %29 = mul i32 %18, 2
+  %30 = xor i32 %11, -1
+  %31 = and i32 %12, %30
+  %32 = xor i32 %12, -1
+  %33 = and i32 %11, %32
+  %34 = or i32 %31, %33
+  %35 = xor i32 %11, %12
+  %36 = and i32 %34, %28
+  %37 = or i32 %34, %28
+  %38 = add i32 %36, %37
+  %39 = add i32 %34, %28
+  %40 = xor i32 %12, -1
+  %41 = sub i32 0, 1
+  %42 = sub i32 %40, %41
+  %43 = sub i32 %11, %42
+  %44 = add nsw i32 %11, %12
+  store i32 %38, ptr %3, align 4
+  %45 = load i32, ptr %2, align 4
+  store i32 %45, ptr %1, align 4
+  %46 = load i32, ptr %3, align 4
+  store i32 %46, ptr %2, align 4
+  br label %47
+
+47:                                               ; preds = %8
+  %48 = load i32, ptr %4, align 4
+  %49 = xor i32 %48, -1
+  %50 = xor i32 1, -1
+  %51 = or i32 %49, %50
+  %52 = xor i32 %48, -1
+  %53 = xor i32 1, -1
+  %54 = or i32 %52, %53
+  %55 = xor i32 %51, -1
+  %56 = xor i32 %54, -1
+  %57 = or i32 %55, %56
+  %58 = and i32 %48, 1
+  %59 = xor i32 %48, -1
+  %60 = xor i32 1, -1
+  %61 = and i32 %59, %60
+  %62 = xor i32 %48, -1
+  %63 = xor i32 1, -1
+  %64 = and i32 %62, %63
+  %65 = xor i32 %61, -1
+  %66 = xor i32 %64, -1
+  %67 = and i32 %65, %66
+  %68 = or i32 %48, 1
+  %69 = and i32 %57, %67
+  %70 = or i32 %57, %67
+  %71 = add i32 %69, %70
+  %72 = add i32 %57, %67
+  %73 = and i32 %48, 1
+  %74 = mul i32 %73, 2
+  %75 = xor i32 %48, 1
+  %76 = add i32 %75, %74
+  %77 = add nsw i32 %48, 1
+  store i32 %71, ptr %4, align 4
+  br label %5, !llvm.loop !7
+
+78:                                               ; preds = %5
+  ret void
+}
+
+declare i32 @printf(ptr noundef, ...) #1
+
+; Function Attrs: noinline nounwind optnone uwtable
+define dso_local i32 @main(i32 noundef %0, ptr noundef %1) #0 {
+  %3 = alloca i32, align 4
+  %4 = alloca i32, align 4
+  %5 = alloca ptr, align 8
+  store i32 0, ptr %3, align 4
+  store i32 %0, ptr %4, align 4
+  store ptr %1, ptr %5, align 8
+  call void @fibonacci()
+  ret i32 0
+}
+
+attributes #0 = { noinline nounwind optnone uwtable "frame-pointer"="all" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+attributes #1 = { "frame-pointer"="all" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
+
+!llvm.module.flags = !{!0, !1, !2, !3, !4}
+!llvm.ident = !{!5}
+
+!0 = !{i32 1, !"wchar_size", i32 4}
+!1 = !{i32 8, !"PIC Level", i32 2}
+!2 = !{i32 7, !"PIE Level", i32 2}
+!3 = !{i32 7, !"uwtable", i32 2}
+!4 = !{i32 7, !"frame-pointer", i32 2}
+!5 = !{!"clang version 16.0.0 (https://github.com/61bcdefg/Hikari-LLVM15.git fed008291456d62c7eb6d8dbced93b8c104e8797)"}
+!6 = !{!"sub", !"sub_prob=100", !"sub_loop=2"}
+!7 = distinct !{!7, !8}
+!8 = !{!"llvm.loop.mustprogress"}

tests/chudnovsky/build.sh

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+clang gmp-chudnovsky.c -o test_orig -lgmp -lm
+clang gmp-chudnovsky.c -o test_sub_1 -lgmp -lm -mllvm --enable-subobf  -mllvm --sub_prob=100 -mllvm --sub_loop=1
+clang gmp-chudnovsky.c -o test_sub_2 -lgmp -lm -mllvm --enable-subobf  -mllvm --sub_prob=100 -mllvm --sub_loop=2
+clang gmp-chudnovsky.c -o test_sub_3 -lgmp -lm -mllvm --enable-subobf  -mllvm --sub_prob=100 -mllvm --sub_loop=3
+clang gmp-chudnovsky.c -o test_sub_4 -lgmp -lm -mllvm --enable-subobf -mllvm --sub_prob=100 -mllvm --sub_loop=4
+clang gmp-chudnovsky.c -o test_cff -lgmp -lm -mllvm --enable-cffobf
+clang gmp-chudnovsky.c -o test_indir -lgmp -lm -mllvm --enable-indibran