Available in all subroutines.

Returns a SHA-1 cryptographic hash for the string s. SHA-1 has known attacks reducing its strength by over half and should not be considered a strong cryptographic hash function.


declare local var.hash_sha1 STRING;
set var.hash_sha1 = digest.hash_sha1("123456789");
# var.hash_sha1 is now "f7c3bc1d808e04732adf679965ccc34ca7ae3441"

Try it out

digest.hash_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.

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.