class Net::IMAP::SASL::ScramAuthenticator

def initialize(username_arg = nil, password_arg = nil,

Any other keyword parameters are quietly ignored.

* _optional_ #min_iterations - Overrides the default value (4096).
* _optional_ #authzid ― Alternate identity to act as or on behalf of.
* #password ― Password or passphrase associated with this #username.
#username - An alias for #authcid.

* #authcid ― Identity whose #password is used.

=== Parameters

Called by Net::IMAP#authenticate and similar methods on other clients.

Each subclass defines #digest to match a specific mechanism.
Creates an authenticator for one of the "+SCRAM-*+" SASL mechanisms.

new(authcid:, password:, **options) -> auth_ctx
new(username:, password:, **options) -> auth_ctx
new(username, password, **options) -> auth_ctx
:call-seq: 
def initialize(username_arg = nil, password_arg = nil,
               authcid: nil, username: nil,
               authzid: nil,
               password: nil, secret: nil,
               min_iterations: 4096, # see both RFC5802 and RFC7677
               cnonce: nil, # must only be set in tests
               **options)
  @username = username || username_arg || authcid or
    raise ArgumentError, "missing username (authcid)"
  @password = password || secret || password_arg or
    raise ArgumentError, "missing password"
  @authzid = authzid
  @min_iterations = Integer min_iterations
  @min_iterations.positive? or
    raise ArgumentError, "min_iterations must be positive"
  @cnonce = cnonce || SecureRandom.base64(32)
end