# `Cmsex.Authenticated`
[🔗](https://github.com/openspb/cmsex/blob/v0.1.0/lib/cmsex/authenticated.ex#L1)

An AuthenticatedData message whose MAC `Cmsex.verify_mac/2` checked.

Fields:

  * `:content` - the content the MAC covers, when the message carries
    it; `nil` for a detached message, whose content the caller gave.
  * `:content_type` - its type, as a name of `Cmsex.OID`, such as
    `:data`, or an OID. With authenticated attributes, the content-type
    attribute was checked against it.
  * `:recipient` - the `Cmsex.RecipientInfo` that gave the MAC key, or
    `nil` when it came in `:mac_key`.
  * `:message` - the `Cmsex.AuthenticatedData`, for the rest: the
    authenticated attributes, which the MAC covers, the unauthenticated
    ones, which it does not, and the originator certificates.

A MAC tells that the content comes from someone who had the MAC key,
and was not changed since. Who that is depends on the recipients: see
`Cmsex.mac/3`.

# `t`

```elixir
@type t() :: %Cmsex.Authenticated{
  content: binary() | nil,
  content_type: atom() | tuple(),
  message: Cmsex.AuthenticatedData.t(),
  recipient: Cmsex.RecipientInfo.t() | nil
}
```

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*Consult [api-reference.md](api-reference.md) for complete listing*