Enum Error 

#[non_exhaustive]
pub enum Error {
    InvalidInput,
    VerificationFailed,
    Unsupported,
    EntropyFailed,
    RngError,
    SelfTestFailed(&'static str),
}

边界内统一的错误类型。

规则：攻击者可控输入（网络数据、证书、密钥文件）不得引发 panic， 一切失败以本错误返回（AGENTS.md 硬性规则 5）。non_exhaustive： 实现里程碑落地时允许追加变体。

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

InvalidInput

输入长度或格式不满足算法要求。

VerificationFailed

密钥/IV/标签等验证失败（认证加密打开失败、签名验证失败等）。 比较必须常数时间，不得通过错误类型区分失败原因。

Unsupported

请求的算法或曲线在当前构建（批准模式）下不可用。

EntropyFailed

熵源失败（OS 随机数不可用）。

RngError

DRBG 失败（健康测试不过、超出生成上限等）。

SelfTestFailed(&'static str)

上电自检失败：模块处于错误状态，拒绝服务，直到重新初始化。

Trait Implementations

impl Clone for Error

fn clone(&self) -> Error

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Error

impl Debug for Error

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

Formats the value using the given formatter.

impl Display for Error

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

Formats the value using the given formatter.

impl Eq for Error

impl Error for Error

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

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

Provides type-based access to context intended for error reports.

impl PartialEq for Error

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Error