I have a function body encryption problem

[Liudeke]

Can the contents of the function body be fully encrypted？
There is no fully encrypted code：
public static float3x3 operator *(float3x3 m1, float3x3 m2)
{
//Discarded unreachable code: IL_022b
//IL_0233: Unknown result type (might be due to invalid IL or missing references)
//IL_0234: Unknown result type (might be due to invalid IL or missing references)
//IL_024c: Unknown result type (might be due to invalid IL or missing references)
//IL_0252: Expected F4, but got Unknown
float3x3 float3x5 = default(float3x3);
float3x5.c0.x = m1.c0.x * m2.c0.x + m1.c0.y * m2.c1.x + m1.c0.z * m2.c2.x;
float3x5.c0.y = m1.c0.x * m2.c0.y + m1.c0.y * m2.c1.y + m1.c0.z * m2.c2.y;
float3x5.c0.z = m1.c0.x * m2.c0.z + m1.c0.y * m2.c1.z + m1.c0.z * m2.c2.z;
float3x5.c1.x = m1.c1.x * m2.c0.x + m1.c1.y * m2.c1.x + m1.c1.z * m2.c2.x;
float3x5.c1.y = m1.c1.x * m2.c0.y + m1.c1.y * m2.c1.y + m1.c1.z * m2.c2.y;
float3x5.c1.z = m1.c1.x * m2.c0.z + m1.c1.y * m2.c1.z + m1.c1.z * m2.c2.z;
_ = ref float3x5.c2;
_ = m1.c2.x * m2.c0.x;
_ = m1.c2.y;
_ = m2.c1;
/Error near IL_0229: Could not find block for branch target IL_022e/;
}

[sunnamed434]

Hi,
I guess you have used BitMethodDotnet protection, I don't know where you get the IL code, but I guess dnSpy, probably decompiler hidden only some part of the code, because it decided to do like that?!

Or you mean something else? I don't really understand what you meant.
Can you provide more context, info, logs please?

[Liudeke]

Hi, I guess you have used BitMethodDotnet protection, I don't know where you get the IL code, but I guess dnSpy, probably decompiler hidden only some part of the code, because it decided to do like that?!

Or you mean something else? I don't really understand what you meant. Can you provide more context, info, logs please?

I want to encrypt the method bodies in a DLL because the content inside the method bodies involves some important information. After encrypting the DLL using BitMono and then decrypting it with ILSpy, I found that some method bodies were not encrypted or hidden, and a lot of content was exposed.

[sunnamed434]

Hi, I guess you have used BitMethodDotnet protection, I don't know where you get the IL code, but I guess dnSpy, probably decompiler hidden only some part of the code, because it decided to do like that?!
Or you mean something else? I don't really understand what you meant. Can you provide more context, info, logs please?

I want to encrypt the method bodies in a DLL because the content inside the method bodies involves some important information. After encrypting the DLL using BitMono and then decrypting it with ILSpy, I found that some method bodies were not encrypted or hidden, and a lot of content was exposed.

I see. Which protections do you use?

[sunnamed434]

Or I guess you're trying to make custom protection, but some methods are not protected?

[Liudeke]

Or I guess you're trying to make custom protection, but some methods are not protected?

yes

[sunnamed434]

Or I guess you're trying to make custom protection, but some methods are not protected?

yes

I see, maybe because methods are skipped cause ignored.

1. Can you get unprotected methods via AsmResolver api (i.e. in BitMono when trying to get methods to protect)? If can't get those methods, try 3 option.
2. Try to Debug AsmResolver/BitMono, also maybe this is because BitMono use a beta version of AsmResolver, just in case try to use a stable release version, maybe 5.*
3. Try to play with obfuscation.json config file, disable some stuff and see if method is accessible via AsmResolver api and method is protected.

Let me know if you will need help.

[Liudeke]

Or I guess you're trying to make custom protection, but some methods are not protected?

yes

I see, maybe because methods are skipped cause ignored.

1. Can you get unprotected methods via AsmResolver api (i.e. in BitMono when trying to get methods to protect)? If can't get those methods, try 3 option.
2. Try to Debug AsmResolver/BitMono, also maybe this is because BitMono use a beta version of AsmResolver, just in case try to use a stable release version, maybe 5.*
3. Try to play with obfuscation.json config file, disable some stuff and see if method is accessible via AsmResolver api and method is protected.

Let me know if you will need help.
I found the problem. Just comment out this line of code .

[sunnamed434]

Oh, so you mean it should be always equal to 0? randomMethodBodyIndex = 0

If I remember correctly, there was a reason for doing a random, when there's more than 3 instructions, but with 0 it works for you just fine?

[Liudeke]

Oh, so you mean it should be always equal to 0? randomMethodBodyIndex = 0

If I remember correctly, there was a reason for doing a random, when there's more than 3 instructions, but with 0 it works for you just fine?

I am not sure, but it is working fine for now. It completely hides the content inside the method body, which is the result I want. I still need to further test the encrypted DLL file.

[sunnamed434]

I see. Let me know tests results once you test it, and I'll consider adding your bug fix.

[sunnamed434]

Hi @Liudeke
I just made a new release v0.34.0, I added your change, so it will hide the full method body, I removed the randomBodyMethodIndex just like you, now it should work fine, please try the latest release and let me know if that works for you now.

[Liudeke]

Hi @Liudeke I just made a new release v0.34.0, I added your change, so it will hide the full method body, I removed the randomBodyMethodIndex just like you, now it should work fine, please try the latest release and let me know if that works for you now.

Okay, if there are any issues, I will communicate with you in a timely manner.