Struct DeviceId 

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

Public types of device identity.

Device identity lives in qualia_dik — an independent, reusable crate that any project needing “a pair of P-256 identity keys in platform hardware” can use without accepting this crate’s vault format or sync protocol. They are re-exported here so that downstream code does not have to depend on both crates.

DevicePublicKey and DeviceSignature are not secret — they are meant to be printed on QR codes, written to logs, and propagated between devices — so they are exported separately from the secret types, which makes it visible in an import list which types may be printed freely. 一台设备的身份标识：设备身份公钥的 SHA-256 指纹。

为什么是公钥的哈希，而不是随机数或自增计数

设备身份是密码学身份：两台设备没有任何共享状态就可以各自动算出同一个 DeviceId。如果改用随机数，设备就需要一个注册表来记住「哪个 ID 对应哪把公钥」； 而在一个没有中心服务器的系统里，那份注册表本身就是需要同步、需要认证、也最难 保证一致的东西。

用哈希则把「ID 与公钥必须一致」变成结构性事实：拿到 ID 就能从公钥重算出来 并比对，无法伪造，也不需要维护。

SHA-256 在这里只用于标识，不承担抗碰撞以外的密码学职责——设备身份的真实性 由签名保证，指纹只是一个便于比较的短名字。

Implementations

impl DeviceId

pub fn from_public_key(public_key: &DevicePublicKey) -> DeviceId

从设备身份公钥计算指纹。

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

从 32 字节原始指纹构造。

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

取原始指纹字节。

pub fn to_hex(&self) -> String

转为小写十六进制。

Trait Implementations

impl Clone for DeviceId

fn clone(&self) -> DeviceId

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for DeviceId

impl Debug for DeviceId

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

十六进制显示，便于在日志与测试失败信息里比对。

设备身份不是秘密——它本来就要印在二维码上给对方看——所以这里不需要 脱敏。这是与 OtpSecret 一类类型的关键区别。

impl Display for DeviceId

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

Formats the value using the given formatter.

impl Eq for DeviceId

impl Hash for DeviceId

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 Ord for DeviceId

fn cmp(&self, other: &DeviceId) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

🔬This is a nightly-only experimental API. (clamp_to)

Restrict a value to a certain range.

impl PartialEq for DeviceId

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for DeviceId

fn partial_cmp(&self, other: &DeviceId) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for DeviceId