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Groups > sci.physics.relativity > #660846
| From | The Starmaker <starmaker@ix.netcom.com> |
|---|---|
| Newsgroups | sci.physics, sci.physics.relativity |
| Subject | Re: DeepSeek |
| Date | 2025-01-27 12:50 -0800 |
| Organization | The Starmaker Organization |
| Message-ID | <6797F19D.651B@ix.netcom.com> (permalink) |
| References | <6797E4C0.34A@ix.netcom.com> <6797E579.34F8@ix.netcom.com> <6797EA66.575B@ix.netcom.com> |
Cross-posted to 2 groups.
This one is cool: Extending the 'expiration date'.
Me:
Apply round-trip Reverse Engineering and rigorously study it by
finding expiry date
and reach a conclusive result by obtaining the actual expiry date
information . The code snippet is presented below:
.method public hidebysig specialname rtspecialname instance void
.ctor() cil managed
{
.maxstack 8
IL_0000: ldarg.0
// ---------- Modification Required here--------------------
IL_0001: ldc.i4 0x7dd
IL_0006: ldc.i4.7
IL_0007: ldc.i4.s 30
//----------------------------------------------------------------
---
IL_0009: newobj instance void [mscorlib]System.DateTime::.ctor
(int32,int32,int32)
IL_000e: stfld valuetype [mscorlib]System.DateTime
TrailSoftware.Form1::expDate
IL_0013: ldarg.0
IL_0014: ldnull
IL_0015: stfld class [System]System.ComponentModel.IContainer
TrailSoftware.Form1::components
IL_001a: ldarg.0
IL_001b: call instance void [System.Windows.Forms]
System.Windows.Forms.Form::.ctor()
IL_0020: nop
IL_0021: nop
IL_0022: ldarg.0
IL_0023: call instance void
TrailSoftware.Form1::InitializeComponent()
IL_0028: nop
IL_0029: nop
IL_002a: ret
}
DeepSeek said:
To perform round-trip reverse engineering on the provided code
snippet and determine the expiry date, we need to analyze the IL
(Intermediate Language) code and extract the relevant information.
The key part of the code involves the creation of a
System.DateTime object, which is then stored in the expDate field
of the TrailSoftware.Form1 class.
Step-by-Step Analysis
Identify the DateTime Constructor Parameters:
The System.DateTime constructor is called with three integer
parameters:
int32 year
int32 month
int32 day
In the IL code, these parameters are loaded onto the stack using
the ldc.i4 and ldc.i4.s instructions:
IL_0001: ldc.i4 0x7dd ? Loads the integer 0x7dd (2013 in decimal)
onto the stack.
IL_0006: ldc.i4.7 ? Loads the integer 7 onto the stack.
IL_0007: ldc.i4.s 30 ? Loads the integer 30 onto the stack.
Convert the Values:
0x7dd in hexadecimal is 2013 in decimal.
7 is the month (July).
30 is the day.
Construct the DateTime Object:
The newobj instruction creates a new System.DateTime object with
the parameters 2013, 7, and 30, which corresponds to July 30,
2013.
Store the DateTime Object:
The stfld instruction stores this DateTime object in the expDate
field of the TrailSoftware.Form1 class.
Conclusion
The expiry date encoded in the IL code is July 30, 2013. This is
the date that the expDate field is initialized to when the
constructor of the TrailSoftware.Form1 class is called.
Final Answer
The actual expiry date obtained from the reverse-engineered code
is July 30, 2013.
Me again:
---------------------------------------------------------
How do I change the date from July 30, 2013 to July 30, 2029?
-------------------------------------------------------------
Deepseek said:
To change the date from July 30, 2013 to July 30, 2029 in the
provided IL (Intermediate Language) code, you need to modify the
value of the year parameter passed to the System.DateTime
constructor. Specifically, you need to replace the hexadecimal
value 0x7dd (which corresponds to 2013) with the hexadecimal value
for 2029.
Steps to Modify the Date
Convert 2029 to Hexadecimal:
The decimal value 2029 in hexadecimal is 0x7ED.
Modify the IL Code:
Locate the line IL_0001: ldc.i4 0x7dd in the IL code.
Replace 0x7dd with 0x7ED to set the year to 2029.
Updated IL Code
Here is the modified IL code with the updated year:
il
Copy
.method public hidebysig specialname rtspecialname instance void
.ctor() cil managed
{
.maxstack 8
IL_0000: ldarg.0
// ---------- Modification Required here--------------------
IL_0001: ldc.i4 0x7ED // Changed from 0x7dd (2013) to 0x7ED
(2029)
IL_0006: ldc.i4.7 // Month (July)
IL_0007: ldc.i4.s 30 // Day (30)
//----------------------------------------------------------------
---
IL_0009: newobj instance void [mscorlib]System.DateTime::.ctor
(int32,int32,int32)
IL_000e: stfld valuetype [mscorlib]System.DateTime
TrailSoftware.Form1::expDate
IL_0013: ldarg.0
IL_0014: ldnull
IL_0015: stfld class [System]System.ComponentModel.IContainer
TrailSoftware.Form1::components
IL_001a: ldarg.0
IL_001b: call instance void [System.Windows.Forms]
System.Windows.Forms.Form::.ctor()
IL_0020: nop
IL_0021: nop
IL_0022: ldarg.0
IL_0023: call instance void
TrailSoftware.Form1::InitializeComponent()
IL_0028: nop
IL_0029: nop
IL_002a: ret
}
Explanation of Changes
The line IL_0001: ldc.i4 0x7dd was changed to IL_0001: ldc.i4
0x7ED.
This ensures that the System.DateTime constructor is called with
the parameters 2029, 7, and 30, which corresponds to July 30,
2029.
Verification
After making this change, the expDate field in the
TrailSoftware.Form1 class will be initialized to July 30, 2029
instead of July 30, 2013.
Tools for Modifying IL Code
If you're working with a compiled assembly, you can use tools
like:
ILSpy (with Reflexil plugin) to decompile and modify IL code.
dnSpy to edit IL code directly in the assembly.
Make sure to recompile or save the modified assembly after making
the changes.
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