hmac_sha512

kumo.digest.hmac_sha512(KEY, MSG)

Since: Dev Builds Only

The functionality described in this section requires a dev build of KumoMTA. You can obtain a dev build by following the instructions in the Installation section.

Computes an HMAC digest over the MSG argument, using KEY as the means for signing/authenticating the data.

This function uses SHA512 as the digest algorithm for the HMAC.

The KEY parameter is expected to be a KeySource defining how to access the secret key bytes.

The returned value is a BinaryResult object representing the digest bytes. It has properties that can return the digest bytes or encoded in a number of common and useful encodings.

Computing the HMAC with a string-based key

local kumo = require 'kumo'

-- It is not recommended to use this form in production.
-- Consider storing the key in either a vault or in a local
-- file to keep the credential material outside of the repo
-- where you maintain your lua policy code
local key_bytes = {
  key_data = 'your key',
}
local hmac = kumo.digest.hmac_sha512(key_bytes, 'your message')
assert(
  hmac.hex
    == '2f5ddcdbd062a5392f07b0cd0262bf52c21bfb3db513296240cca8d5accc09d18d96be0a94995be4494c032f1eda946ad549fb61ccbe985d160f0b2f9588d34b'
)