Struct Key

pub struct Key(/* private fields */);

A cryptographic master key for use with Signed and/or Private jars.

This structure encapsulates secure, cryptographic keys for use with both PrivateJar and SignedJar. A single instance of a Key can be used for both a PrivateJar and a SignedJar simultaneously with no notable security implications.

Implementations

impl Key

pub fn from(key: &[u8]) -> Key

Creates a new Key from a 512-bit cryptographically random string.

The supplied key must be at least 512-bits (64 bytes). For security, the master key must be cryptographically random.

Panics

Panics if key is less than 64 bytes in length.

For a non-panicking version, use Key::try_from() or generate a key with Key::generate() or Key::try_generate().

Example

use cookie::Key;

let key = { /* a cryptographically random key >= 64 bytes */ };

let key = Key::from(key);

pub fn generate() -> Key

Generates signing/encryption keys from a secure, random source. Keys are generated nondeterministically.

Panics

Panics if randomness cannot be retrieved from the operating system. See Key::try_generate() for a non-panicking version.

Example

use cookie::Key;

let key = Key::generate();

pub fn try_generate() -> Option<Key>

Attempts to generate signing/encryption keys from a secure, random source. Keys are generated nondeterministically. If randomness cannot be retrieved from the underlying operating system, returns None.

Example

use cookie::Key;

let key = Key::try_generate();

pub fn signing(&self) -> &[u8]

Returns the raw bytes of a key suitable for signing cookies. Guaranteed to be at least 32 bytes.

Example

use cookie::Key;

let key = Key::generate();
let signing_key = key.signing();

pub fn encryption(&self) -> &[u8]

Returns the raw bytes of a key suitable for encrypting cookies. Guaranteed to be at least 32 bytes.

Example

use cookie::Key;

let key = Key::generate();
let encryption_key = key.encryption();

pub fn master(&self) -> &[u8]

Returns the raw bytes of the master key. Guaranteed to be at least 64 bytes.

Example

use cookie::Key;

let key = Key::generate();
let master_key = key.master();

Trait Implementations

impl Clone for Key

fn clone(&self) -> Key

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Key

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl PartialEq for Key

fn eq(&self, other: &Key) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl TryFrom<&[u8]> for Key

fn try_from(key: &[u8]) -> Result<Key, <Key as TryFrom<&[u8]>>::Error>

A fallible version of Key::from().

Succeeds when Key::from() succeds and returns an error where Key::from() panics, namely, if key is too short.

Example

use cookie::Key;

let key = { /* a cryptographically random key >= 64 bytes */ };
assert!(Key::try_from(key).is_ok());

// A key that's far too short to use.
let key = &[1, 2, 3, 4][..];
assert!(Key::try_from(key).is_err());

type Error = KeyError

The type returned in the event of a conversion error.