Struct Token 

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

A deterministic token for consistent pseudonymization.

Tokens are produced by HMAC-SHA256, ensuring:

• Same input always produces the same token
• Tokens are uniformly distributed (good for database indexes)
• Original value cannot be recovered from token alone

Security Warning

Deterministic tokens reveal frequency patterns. If the same SSN appears 100 times, the same token appears 100 times. Use only when consistency is required (e.g., joining records without exposing real identifiers).

Implementations

impl Token

pub fn from_bytes(bytes: [u8; 32]) -> Token

Creates a token from bytes.

pub fn as_bytes(&self) -> &[u8; 32]

Returns the token as bytes.

pub fn to_hex(&self) -> String

Returns the token as a hex string.

Trait Implementations

impl Clone for Token

fn clone(&self) -> Token

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Token

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

Formats the value using the given formatter.

impl Display for Token

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

Formats the value using the given formatter.

impl Hash for Token

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Token

fn eq(&self, other: &Token) -> 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 Copy for Token

impl Eq for Token

impl StructuralPartialEq for Token