I want to create a 32-bit number out of an ASCII-string. CRC32 algorithm is exactly what I'm looking for, but I can't use it because the table it requires is way too huge (it is for an embedded sys...

Upd. See the end of post for working code I'm already mad with this. How can I make checksum from CRC unit on stm32f103 match with software implementation? Stm has polynom 0x04C11DB7 and reset val...

If I have a certain number of bytes to transfer serially, how do I determine which CRC (CRC8, CRC16, etc., basically a how many bit CRC?) to use and still have error detection percentage be high? I...

I am using the following function to generate a CRC sum and it doesn't appear to be returning the same checksum when compared to online CRC-CCITT calculators. This function specifically uses the X...

I'm modifying a firmware file (.jic) JTAG Indirect Configuration File with a small algorithm, but changing data inside the file makes it unusable because there is a checksum somewhere in the file t...

I'm working on a library to provide simple reliable communication over an RS232 or RS485 connection. Part of this code involves using a CRC16 checksum on the data to detect corruption from line noi...

I know that implementations exist for SHA-1 and SHA-256 in System.Security.Cryptography. Is there anything built in that can compute CRC hashes?

What is the fastest way to create a hash function which will be used to check if two files are equal? Security is not very important. Edit: I am sending a file over a network connection, and will...

I have seen multiple implementation of crc8 implementation in C, but I am unable to figure out for polynomial(x8,x5,x4,1) i.e. 0x31 and initialization 0xFF. Also reflect input = False, reflect ou...

I need to calculate exactly CRC-8-Dallas/Maxim. Can someone provide an algorithm? Any help is appreciated!

I'm trying to add CRC16 error detection to a Motorola HCS08 microcontroller application. My checksums don't match, though. One online CRC calculator provides both the result I see in my PC program ...

I'm trying to calculate/validate the CRC32 checksums for compressed bzip2 archives. .magic:16 = 'BZ' signature/magic number .version:8 = 'h' for Bzip2 ('H'uffman coding) .hundred_k_blocksize:8 = '...

I need to get CRC64 checksum of files using PHP. With this code file_put_contents('example.txt', 'just an example'); echo hash_file('crc32', 'example.txt'); I get CRC32 checksum "c8c429fe"; B...

Problem I am writing code for an embedded device. A lot of solutions out there for CRC-CCITT 16-bit calculations require libraries. Given that using libraries is almost impossible and a drain on ...

When is it appropriate to use CRC for error detection versus more modern hashing functions such as MD5 or SHA1? Is the former easier to implement on embedded hardware?

I need to calculate this CRC using Python for the communication with Aurora (ABB) solar inverter. This is the document: http://www.drhack.it/images/PDF/AuroraCommunicationProtocol_4_2.pdf in the l...

I tried to find out how to calculate the error detection capabilities of arbitrary CRC polynomials. I know that there are various error detection capabilities that may (or may not) apply to an arb...

I am trying to write a script to clean up mp3 file names using Python and eyeD3 but I am getting "WARNING:eyed3.mp3.headers:Lame tag CRC check failed" when I try to load an mp3 file using the follo...

I have the following frame: 7e 01 00 00 01 00 18 ef 00 00 00 b5 20 c1 05 10 02 71 2e 1a c2 05 10 01 71 00 6e 87 02 00 01 42 71 2e 1a 01 96 27 be 27 54 17 3d b9 93 ac 7e If I understand correctly...

I've seen 8-bit, 16-bit, and 32-bit CRCs. At what point do I need to jump to a wider CRC? My gut reaction is that it is based on the data length: 1-100 bytes: 8-bit CRC 101 - 1000 bytes: 16-bit...

Is there any library/code in Java to calculate the 32-bit CRC of a stream of bytes in a way thats consistent with the cksum command in unix ?

There are two ways of implementing CRC generation with linear feedback shift registers (LFSR), as shown in this figure . The coefficients of generator polynomial in this picture are 100111, and the...

Where I can find this crc32() function in detail? I saw this Link but I couldn't figure out how CRC is being calculated. I asked a question about updating the CRC based on the data stream instead o...

I want to calculate the CRC of file and get output like: E45A12AC. Here's my code: #!/usr/bin/env python import os, sys import zlib def crc(fileName): fd = open(fileName,"rb") content = fd.rea...

Is it possible to calculate the CRCs on the fly (in the streams)? For example, I have 1-gigabyte data and I want to reduce the possibility of undetected errors. I want to implement something (CRC o...