CRC32 Calculator (Javascript)

This page provides a Javascript implementation CRC32 (Cyclic Redundancy Checksum) calculator.

CRC32 (Cyclic Redundancy Checksum) is a fast and efficient algorithm to check the integrity of the data. It returns a 32-bit integer (signed or unsigned). It can be considered a weak type of Cryptographic hash functions (such as MD5). The cryptographic has functions normally has the following 4 goals:

1. easy to implement and calculate the value for any given message
2. not possible to generate a message that has a given hash
3. not possible to modify a message without changing the hash
4. not possible to find two different messages with the same hash.

This page provides a Javascript implementation CRC32 (Cyclic Redundancy Checksum) calculator. Please visit https://rot47.net/picture-gallery/ which is a fantastic image gallery!

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The last goal is essentially the conflicts that two different source generating the same value. For CRC32, the implementation is quite easy. You define a CRC32 Table which consists of 256 elements (see the crc32.js), and just looping each element of the source text and do the computation like this:

r = (r >> 8) ^ CRCTable[str[i] ^ (r & 0x000000FF)];

where r stores the intermediate 32-bit integer value.

Javascript Download

Use the CRC32 function in your application easily; crc32.js

Link here!

Just paste the HTML code, shown below, onto the site of your choice.

    <a href="https://rot47.net/crc32.html" title="Online CRC32 Calculator (Cyclic Redundancy Check)">Online CRC32 Javascript Calculator</a>

Plain text example:
Online CRC32 Javascript Calculator

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