Available inall subroutines.

Returns a CRC-32 digest for the string s. CRC-32 is not a cryptographic hash and is typically used as a fast error-detecting code for detecting changes in raw data.

This algorithm is known as CRC-32/BZIP2.


declare local var.crc32 STRING;
set var.crc32 = digest.hash_crc32("123456789");
# var.crc32 is now "181989fc"

Try it out

digest.hash_crc32 is used in the following code examples. Examples apply VCL to real-world use cases and can be deployed as they are, or adapted for your own service. See the full list of code examples for more inspiration.

Click RUN on a sample below to provision a Fastly service, execute the code on Fastly, and see how the function behaves.

Check validity of inputs using a non-crypto hash

Block or identify syntactically invalid requests at the edge by using a hash function of your choice.