Python .crc32()

The .crc32() function computes a CRC-32 checksum of the given data using a cyclic redundancy check algorithm. It is commonly used to detect accidental changes in raw data.

Syntax

binascii.crc32(data, value=0)

Parameters:

• data: A bytes-like object containing the binary data whose CRC-32 checksum is to be computed.
• value (optional): An initial CRC value. This can be used to compute cumulative CRCs across multiple data blocks. Default is 0.

Return value:

Returns an integer representing the CRC-32 checksum of the input data.

Example

In this example, the CRC-32 checksum of a single string of binary data is computed:

import binascii

# Create binary data
binary_data = b"hello world"

# Compute the CRC-32 checksum
checksum = binascii.crc32(binary_data)

print(checksum)

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This produces the following output :

222957957

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The output value is an unsigned 32-bit integer representing the checksum of the input data.

Codebyte Example

In this example, the CRC-32 checksum is computed incrementally for multiple chunks of data, simulating a real-world file integrity check:

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