# crypto/hmac Compute an HMAC (keyed hash-based message authentication code) as a hex string. ## Syntax

[crypto/hmac :algo $key $data]

## Parameters - `:algo` — One of `:sha256`, `:sha512` - `$key` — Secret key (bytes) - `$data` — Data to authenticate ## Examples

[crypto/hmac :sha256 "secret-key" "message"]

## Returns Lowercase hex digest string, or `%Err{ message "..." }` if unsupported. ## See Also `crypto/sha256`, `crypto/sha512`, `crypto/hash`