tss | Threshold Secret | Cryptography library
kandi X-RAY | tss Summary
kandi X-RAY | tss Summary
Threshold Secret Sharing (Shamir's secret sharing scheme)
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Top functions reviewed by kandi - BETA
- Implementation of gf256_sub
- Gives the addition of a and b
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Community Discussions
Trending Discussions on tss
QUESTION
I am trying to send a row from a spreadsheet to another and the script below works fine. But now I am trying to add two improvements:
- Activate the script if in the column C there are the voices "Yellow 1" or "Green 2" or "Red 3" or "Brown 5"
- After sent the row to the target spreadsheet, delete the row from the source spreadsheet
I am trying with:
IF statements.deleteRow(row)
But I cannot reach the goal, cause there are some errors
...ANSWER
Answered 2022-Apr-14 at 12:02I believe your goal is as follows.
- When one of the values of
'Yellow 1','Green 2','Red 3','Brown 5'is put in the column "C" of "source" sheet of the active Spreadsheet, you want to move this row to "destination" sheet in other Spreadsheet. - You want to run this script by OnEdit trigger.
Unfortunately, when I saw your showing script, I noticed that the script has a lot of modification points. For example, the variables of r, sss, s, row are not declared. So, in this case, how about the following sample script?
Please replace ### of var dstSheet = SpreadsheetApp.openById('###').getSheetByName('destination'); with your destination Spreadsheet ID. And, please install OnEdit trigger to the function installedOnEdit. Because when openById is used, it is required to use the installable trigger.
QUESTION
I was doing an automation fun project and I choose this website https://agoodmovietowatch.com/ this is a single-page website so to target the sign-up link I inspect and find that this sign-up link is not a
...ANSWER
Answered 2022-Mar-02 at 12:14Here is a working solution:
QUESTION
So I have a huge spreadsheet with 9k rows and more than 30 columns. I want to copy this spreadsheet to another spreadsheet (Values only).
Previously I was using this code successfully, but due to the increase in data, the script now times out (1800s +). Is there a way to optimize this script or maybe an alternative option altogether?
...ANSWER
Answered 2022-Feb-18 at 07:07QUESTION
I've got a horrendously large dataframe (covering hundreds of days worth of data) that contains data of the following pattern:
...ANSWER
Answered 2022-Feb-09 at 14:17Your table requires some fixing, but once you do that, you can do this
QUESTION
I want to import a sheet from another Google Spreadsheet in place of values only using Google Apps Script, and check if the existing sheet is there or not. Any help is highly appreciated.
...ANSWER
Answered 2022-Feb-07 at 10:25Try this
QUESTION
When I read Intel's X86 programmer's manual, see the following for interrupt & interrupt return with stack switching:
interrupt:
If a stack switch does occur, the processor does the following:
- Temporarily saves (internally) the current contents of the SS, ESP, EFLAGS, CS, and EIP registers.
- Loads the segment selector and stack pointer for the new stack (that is, the stack for the privilege level being called) from the TSS into the SS and ESP registers and switches to the new stack.
- Pushes the temporarily saved SS, ESP, EFLAGS, CS, and EIP values for the interrupted procedure’s stack onto the new stack.
- Pushes an error code on the new stack (if appropriate).
- Loads the segment selector for the new code segment and the new instruction pointer (from the interrupt gate or trap gate) into the CS and EIP registers, respectively.
- If the call is through an interrupt gate, clears the IF flag in the EFLAGS register.
- Begins execution of the handler procedure at the new privilege level.
On return:
- Performs a privilege check.
- Restores the CS and EIP registers to their values prior to the interrupt or exception.
- Restores the EFLAGS register.
- Restores the SS and ESP registers to their values prior to the interrupt or exception, resulting in a stack switch back to the stack of the interrupted procedure.
- Resumes execution of the interrupted procedure.
For example, one linux process P:
- It's initially in kernel mode
- It returns to user mode by
iret. But from the manual, there is no change to TSS - It traps into kernel by
int. Here it needs to find the kernel stack fromESP & SSin TSS. How is this kernel stack value set up, since they are not stored to TSS in step 2?
ANSWER
Answered 2022-Jan-12 at 03:58Once the kernel returns to user-space for a given task, it's done with that task's kernel stack until the next interrupt / exception. There's no useful data on it, so the TSS can hold a fixed SS:[ER]SP value that points to the top of the virtual page[s] allocated as the kernel stack for the current task.
Kernel state doesn't live on the kernel stack between entries into the kernel; it's kept elsewhere in a process control block. (Context switches between asks actually happen in the kernel, switching kernel stacks to the formerly-sleeping task's kernel stack, so eventually returning to user-space means returning up the call-chain of whatever that task was doing in the kernel first).
BTW, unless the kernel pushes a new CS:EIP / EFLAGS / SS:ESP for iret to pop, the stuff it pops will be the stuff pushed by hardware at the address specified in the TSS. So even if there was some desire to re-enter the kernel with the stack as you left it, that would normally be at the TSS location anyway. But this is irrelevant because Linux doesn't keep stuff on a task's kernel stack while user-space is running, except for a pointer to per-task stuff at the bottom of the region where the kernel can find it with [ER]SP & -16384.
(I think this is right; I've looked at a few bits of Linux kernel code but haven't really gotten my hands dirty experimenting with things. I think this is how Linux works, and a consistent viable design.)
QUESTION
I want to launch Neo4j on my machine with dokcer. I downloaded it and did it:
...ANSWER
Answered 2021-Dec-21 at 14:21You also need to expose the bolt port from the docker container. The default bolt port is 7687.
QUESTION
In a 64 bit program the selector:offset used to get the stack protector is fs:0x28, where fs=0. This poses no problem because in 64 bit we have the MSR fs_base (which is set to point to the TLS) and the GDT is completely ignored.
But with 32 bit program the stack protector is read from gs:0x14. Running over a 64 bit system we have gs=0x63, on a 32 bit system gs=0x33. Here there are no MSRs because they were introduced in x86_64, so the GDT plays an important role here.
Dissecting this values we get for both cases a RPL=3 (which was expected), the descriptor table selector indicates GDT (LDT is not used in linux) and the selector points to the entry with index 12 for 64 bits and index 6 for 32 bits.
Using a kernel module I was able to check that this entry in 64-bit linux is NULL! So I don't understand how the address of the TLS is resolved.
The relevant part of the kernel module is the following:
...ANSWER
Answered 2021-Dec-10 at 21:18After the comment of @PeterCordes I searched in the "AMD64 Architecture Programmer's Manual, vol. 2", where in page 27 says:
Compatibility mode ignores the high 32 bits of base address in the FS and GS segment descriptors when calculating an effective address.
This implies that a 64-bit kernel managing a 32-bit process uses the MSR_*S_BASE registers as it would for a 64-bit process. The kernel can set the segment bases normally while in 64-bit long mode, so it doesn't matter whether or not those MSRs are available in 32-bit compatibility sub-mode of long mode, or in pure 32-bit protected mode (legacy mode, 32-bit kernel). A 64-bit Linux kernel only uses compat mode for ring 3 (user-space) where wrmsr and rdmsr aren't available because of privileges. As always, segment-base settings persist across changes to privilege level, like returning to user-space with sysret or iret.
Another thing that made me think that this registers weren't used for compatibility-mode processes was GDB. This is what happens when trying to print this register while debugging a 32-bit program.:
QUESTION
Situation: I have a flat file of data with various elements in it and I need to extract specific portions. I am a beginner in Python and wrote it out using Regular Expressions and other functions. Here is a sample of the data from the txt file I receive:
...ANSWER
Answered 2021-Dec-09 at 00:49For practising your Regex, I recommend using a website like RegExr. Here, you can paste the text that you want to match and you can play around with different matching expressions to get the result that you intend.
Assuming that you want to use this code for multiple files of the same organisation and that the data is formatted the same way in each, you can simplify your code a lot.
Let's say we wanted to extract NAME = JOHN SMITH from the text file. We could write the following Python code to do this:
QUESTION
So afaik IA32_LSTAR is supposed to hold the address of KiSystemCall64/KiSystemCall64Shadow, so right before a syscall was made on ntdll I dumped it, and set a breakpoint on it (KiSystemCall64Shadow) upon tracing with p on windbg I get a bugcheck(DOUBLE_FAULT), why is that?
I should mention that this whole process was inside a VM so I could kernel-debug the application
output of !analyze -v
...ANSWER
Answered 2021-Nov-26 at 23:41kernel mode interrupt entries check in which mode was interrupt - user or kernel, by checking lowest bit of CS on stack (CPL) and execute SWAPGS instruction only in case iterrupt was from user mode. otherwise in GS assume already correct value - in user mode GS point to TEB and in kernel mode to KPCR. example of
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Install tss
You can use tss like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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