Enum RsaPssSaltLength 

#[non_exhaustive]
pub enum RsaPssSaltLength {
    Digest,
    Max,
    Custom(u16),
}

Available on crate features aws-lc and crypto and std only.

An RSA-PSS padding salt length.

If a non-default value is used for a signature, then a matching verification should also use the same value, otherwise it will fail.

Using this type with PSS is FIPS-approved only when the salt length equals the digest length, i.e. either when Self::Digest or Self::Custom is used, and the latter with that digest length given. Self::Max or any other value passed into Self::Custom will not be FIPS-approved.

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.

Digest

The salt length is set to the length of the used digest algorithm.

Corresponds to [RSA_PSS_SALTLEN_DIGEST]. This is the default.

Max

The salt length is set to the maximum possible length with respect to the used digest algorithm and public key.

This corresponds to emLen - hLen - 2, where

• emLen is (pub_key_size_bits + 6) / 8, so depends on the mod size;
• hLen is the digest algorithm’s output length;

A verification of a signature produced using this salt length may only work when also using this maximum length, not any length up to it.

Custom(u16)

The salt length is set to the given custom value.

The passed value is not particularly checked here, so may ultimately result in failures.

Trait Implementations

impl Clone for RsaPssSaltLength

fn clone(&self) -> RsaPssSaltLength

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for RsaPssSaltLength

impl Debug for RsaPssSaltLength

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

Formats the value using the given formatter.

impl Default for RsaPssSaltLength

fn default() -> RsaPssSaltLength

Returns the “default value” for a type.

impl Eq for RsaPssSaltLength

impl PartialEq for RsaPssSaltLength

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for RsaPssSaltLength