Enum MixingPolicy 

#[non_exhaustive]
pub enum MixingPolicy {
    Exclusive,
    PublicKeyMixable,
    Custom {
        compatibility_class: &'static str,
    },
}

Public diagnostic category for a recipient mixing rule, surfaced through CryptoError::IncompatibleRecipients.

This is intentionally not the full internal enforcement representation — that is the crate-private NativeMixingRule type, which can express new native compatibility classes without adding public enum variants. MixingPolicy::Custom is the catch-all for compatibility classes that do not match the two fixed shorthand variants below; the associated compatibility_class string preserves which class the offending rule declared, so programmatic diagnostics can distinguish (for example) a post-quantum class clash from any future custom class.

The enum is #[non_exhaustive] so future native rules can be added without a breaking API change.

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.

Exclusive

This recipient must appear alone — not mixed with any other entry, including unknown non-critical ones. Currently: argon2id.

PublicKeyMixable

Standard public-key mixability: multiple recipients of this type are permitted, alongside other public-key recipients in the same compatibility class. Currently: x25519.

Custom

A recipient-specific compatibility class not represented by the fixed shorthand variants above. The compatibility_class field carries the class identifier the offending rule declared so a caller can distinguish — for example — a post-quantum class clash ("postquantum") from a future custom class.

Fields

compatibility_class: &'static str

Class identifier as declared by the recipient type’s crate-private mixing rule. Stable per native type within a release; not part of the wire format and never appears on disk.

Trait Implementations

impl Clone for MixingPolicy

fn clone(&self) -> MixingPolicy

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for MixingPolicy

impl Debug for MixingPolicy

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

Formats the value using the given formatter.

impl Eq for MixingPolicy

impl PartialEq for MixingPolicy

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for MixingPolicy