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