-spec id() -> binary().

Equivalent to id(?ID_LENGTH).

-spec id(Length :: integer()) -> binary().

Generate a random key consisting of numbers and upper and lower case characters.

The version with the default Length can be used for session ids: the result is sufficiently random and sufficiently unique.

-spec identifier() -> binary().

Equivalent to identifier(?OPTID_LENGTH).

-spec identifier(Length :: integer()) -> binary().

Get a random identifier of a certain length, consisting of lower case characters only.

-spec number() -> pos_integer().

Equivalent to number(1000000000).

-spec number(Max :: pos_integer()) -> pos_integer().

Return a random integer less than or equal to Max. Max defaults to a large number smaller than MaxInt.

-spec optid(undefined | false | binary()) -> binary().

Generate an identifier if the identifier was not defined.

-spec password() -> binary().

Generate a password that matches most criteria of complexity and is still (kind of) readable.

-spec rand_bytes(integer()) -> binary().

Return N random bytes. This falls back to the pseudo random version of rand_uniform if strong_rand_bytes fails.

-spec random_id(charset(), Length :: integer()) -> binary().

Get a random identifier of the specified length, consisting of characters from the specified set: - 'az'

  [a-z]

: lower case characters only. - 'az09'

  [a-z0-9]

: lower case characters and numbers only. - 'azAZ09'

  [a-zA-Z0-9]

: lower and upper case characters and numbers. - '09'

  [0-9]

: numbers only. - 'special'

  [!#$%&()*+/;:<>=?@]

: special characters for passwords.

-spec sign_key() -> binary().

Generate a key for signing requests stored in the user agent.

-spec sign_key(Context :: term()) -> binary().

Get the key for signing requests stored in the user agent.

-spec sign_key_simple() -> binary().

Generate a key for less secure signing of data (without nonce).

-spec sign_key_simple(Context :: term()) -> binary().

Get the key for less secure signing of data (without nonce).

-spec unique() -> binary().

Return an unique id to be used in javascript or html. No randomness, just unique for the current runtime system instance.

Returns a binary of unspecified length starting with the character $t followed by a number of digits, example: <<"t123456">>. Note that ids are not unique among connected nodes or after a restart.