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+=====HMACHex(algorithm, key, text)=====
+Calculates a keyed hexadecimal hash of a given text value using one of the algorithms:
+  * md5
+  * sha1
+  * sha256
+  * sha384
+  * sha512
+The specified algorithm is used as a Hash-based Message Authentication Code (HMAC). The HMAC process mixes a secret key with the message data, hashes the result with the hash function, mixes that hash value with the secret key again, and then applies the hash function a second time.
+Remarks: data types other than text are not converted into text automatically. All texts are assumed to have the UTF-8 encoding. The algorithm name is case-insensitive. The key and the value are case-sensitive.
+Example:
+^ Expression ^ Result ^
+| hmachex("md5", "223jh4gj2h3g4", "We're just two lost souls swimming in a fish bowl")  | 9ab29e6486f1ff01d2cbb4238abc0320  |
+**See also**
+  * [[syntax:functions:hashhex|HashHex(algorithm, value)]]
+  * [[syntax:functions:hash|Hash(value)]]