Available inall subroutines.
Returns a SHA-1-based message authentication code based on the supplied
key and string
declare local var.hmac_sha1 STRING;set var.hmac_sha1 = digest.hmac_sha1("key", "input");# var.hmac_sha1 is now "0x8513bb355076cce2ae5eb9f399ab5cafdba7c8a2"
digest.hmac_sha1 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.
Create self-destructing URLs for time-limited access
Make URLs expire after a configurable period.