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2 votes
3 replies
123 views

I have an embedded device that implements an unknown 32-bit CRC-based checksum algorithm in hardware. I can use this device as an oracle to generate checksum values from arbitrary input, and verify ...
1 vote
1 answer
229 views

I'm in need to generate a CRC32 efficiently from within vbScript. I'm aware of doing this with CRC32 tables and so on, but this is very slow for large files. Therefore I'm using 7-zip.exe with option ...
1 vote
0 answers
33 views

I’m working on STM32H755 bootloader project where I need to verify the integrity of the application firmware using a CRC32 checksum. The build system uses srec_cat to append the CRC32 at the end of ...
1 vote
2 answers
121 views

Say I have two constant strings, both of with have their own pre-computed CRC, and I want to compute the CRC of the concatenation of those two strings. Here's a naive implementation: struct ...
sh1's user avatar
  • 5,020
1 vote
1 answer
55 views

Redshift's CRC32 function returns a string: SELECT CRC32('abc'); > 364b3fb7 while MySQL returns an integer: SELECT CRC32('abc'); > 891568578 From AWS docs: The CRC32 function returns an 8-...
0 votes
0 answers
55 views

I need to generate CRC (MPEG2 algorithm) on a hex file by using SRecord tool, I used below command: srec_cat sample_final_CRC.hex -Bit_Reverse -CRC32LE 0x0000B000 -Bit_Reverse -XOR 0xff -crop ...
1 vote
1 answer
39 views

I'm using Robot.js to take screenshots (I don't really want to install any other heavy packages over 1 mb, but I'm already using Robot.js and no, Jimp isn't what I'm looking for). Since the ...
0 votes
1 answer
378 views

I have recently been studying the issue of CRC32 calculation acceleration, which is aimed at the type of CRC32b (polynomial 0x04C11DB7), but I found that the crc32 instructions in Intel's SSE4.2 are ...
Dbettkk's user avatar
  • 113
0 votes
0 answers
108 views

I ́m trying to generate a kafka producer message by native tcpip on .net, I have the message already done, but I ́m missing something on CRC calculation, I generate a CRC calculation with: public ...
-1 votes
2 answers
151 views

I am trying to reverse a hash into a sequence of bytes. The function is shown below. def decrypt(hash, size): bytes = bin(int(hash, 16)).replace("0b", "").zfill(32) bytes = ...
Nguyen Tran's user avatar
0 votes
2 answers
188 views

My goal is just to self-verify the consistency of a file without sending any additional files or signatures. I'd like to append a CRC at the end in a way that creates a predictable output from cksum ...
Ed K's user avatar
  • 424
2 votes
1 answer
67 views

I need to calculate a 32-bit CRC but the microprocessor I am using only has a 16-bit CRC peripheral. Would it be possible to still use this 16-bit peripheral as part of my 32-bit calculations, and ...
natevw's user avatar
  • 18.2k
0 votes
0 answers
103 views

I am sending some data from my react native app to store it on GCS bucket using signed url. However, I don't want to risk writing my own implementation for crc32c hashing and making mistake. Is there ...
0 votes
1 answer
313 views

In section 4.4.7 (CRC-32) of APPNOTE.txt you can find The 'magic number' for the CRC is 0xdebb20e3. However, the regular polynomial (0x04C11DB7) of CRC-32 works fine. Bit-reflected, it is 0xEDB88320....
0 votes
3 answers
555 views

I took the source code of cksum and copied the polynomial. This gives the same as the predefined IEEE variant defined in the Go standard library. package main import ( "fmt" "...
ceving's user avatar
  • 24.2k

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