feat: add sha256 and hmac_sha256 filters for cryptographic operations (#889)

docs/source/filters/hmac_sha256.md

@@ -0,0 +1,20 @@
+---
+title: hmac_sha256
+---
+
+{% since %}vNEXT{% endsince %}
+
+Converts a string into an SHA-256 hash using a hash message authentication code (HMAC). The secret key is passed as the filter argument. The output is a lowercase hexadecimal string.
+
+Input
+
+```liquid
+{%- assign secret_potion = 'Polyjuice' | hmac_sha256: 'Polina' -%}
+My secret potion: {{ secret_potion }}
+```
+
+Output
+
+```text
+My secret potion: 8e0d5d65cff1242a4af66c8f4a32854fd5fb80edcc8aabe9b302b29c7c71dc20
+```

docs/source/filters/overview.md

@@ -16,5 +16,6 @@ Array | slice, map, sort, sort_natural, uniq, where, where_exp, group_by, group_
 Date | date, date_to_xmlschema, date_to_rfc822, date_to_string, date_to_long_string
 Misc | default, json, jsonify, inspect, raw, to_integer
 Base64 | base64_encode, base64_decode
+Crypto | sha256, hmac_sha256
 
 [shopify/liquid]: https://github.com/Shopify/liquid

docs/source/filters/sha256.md

@@ -0,0 +1,20 @@
+---
+title: sha256
+---
+
+{% since %}vNEXT{% endsince %}
+
+Converts a string into an SHA-256 hash. The output is a lowercase hexadecimal string.
+
+Input
+
+```liquid
+{%- assign secret_potion = 'Polyjuice' | sha256 -%}
+My secret potion: {{ secret_potion }}
+```
+
+Output
+
+```text
+My secret potion: 44ac1d7a2936e30a5de07082fd65d6fe9b1fb658a1a98bfe65bc5959beac5dd0
+```