CRC computation port from C to Python Question: I need to convert the following CRC computation algorithm to Python: #include <stdio.h> unsigned int Crc32Table[256]; unsigned int crc32jam(const unsigned char *Block, unsigned int uSize) { unsigned int x = -1; //initial value unsigned int c = 0; while (c < uSize) { x = ((x >> …
Calculate crc32 with seed using Python Question: In linux/crc32.h there is crc32 that define: crc32(seed, data, length) How can I calculate crc32 with seed using Python? Asked By: Kokomelom || Source Answers: Go to the docs: import zlib help(zlib.crc32) Help on built-in function crc32 in module zlib: crc32(data, value=0, /) Compute a CRC-32 checksum of …
zipfile.BadZipFile: Bad CRC-32 when extracting a password protected .zip & .zip goes corrupt on extract Question: I am trying to extract a password protected .zip which has a .txt document (Say Congrats.txt for this case). Now Congrats.txt has text in it thus its not 0kb in size. Its placed in a .zip (For the sake …
Python find CRC32 of string Question: I tried to get crc32 of a string data type variable but getting the following error. >>> message=’hello world!’ >>> import binascii >>> binascii.crc32(message) Traceback (most recent call last): File “<stdin>”, line 1, in <module> TypeError: a bytes-like object is required, not ‘str’ For a string values it can …
CRC32 calculation in Python without using libraries Question: I have been trying to get my head around CRC32 calculations without much success, the values that I seem to get do not match what I should get. I am aware that Python has libraries that are capable of generating these checksums (namely zlib and binascii) but …
Difficulty comparing generated and google cloud storage provided CRC32c checksums Question: I am attemptting to get a CRC32c checksum on my local file so I can compare it to the blob.crc32c provided by the gcloud library. Google says I should be using the crcmod module in order to actually calculate CRC32c hashes of my data. …
Why does python's zlib.crc32 need a bitwise AND to be considered "stable"? Question: According to the following python documentation: Changed in version 3.0: Always returns an unsigned value. To generate the same numeric value across all Python versions and platforms, use crc32(data) & 0xffffffff. Why is it necessary to perform a bitwise AND with a …
Make CRC on stm32 match with software implementation Question: 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 value 0xFFFFFFFF. So I’ve tried to calculate it in python. Code for …
How to calculate CRC32 with Python to match online results? Question: I’m trying to calculate/generate the CRC32 hash of some random strings using Python but they do not match the values I generate from online sources. Here is what I’m doing on my PC, >>> import binascii >>> binascii.crc32(‘hello-world’) -1311505829 Another approach, >>> import zlib …
Calculate/validate bz2 (bzip2) CRC32 in Python Question: 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 = ‘1’..’9′ block-size 100 kB-900 kB .compressed_magic:48 = 0x314159265359 (BCD (pi)) .crc:32 = checksum for this block … … .eos_magic:48 = 0x177245385090 (BCD sqrt(pi)) …
