Enum SigAlg 

#[repr(u8)]
pub enum SigAlg {
    Ed25519 = 1,
    RsaPssSha256 = 2,
}

Signature algorithm.

Variants

Ed25519 = 1

Author signature. The only one this build executes.

RsaPssSha256 = 2

Editing-device signature, format version 3: RSA-PSS-SHA256, MGF1-SHA256, 32-byte salt, exponent 65537.

Chosen for its failure mode, not taste: ECDSA consumes an ephemeral k for every signature, and signing two different messages with the same k reveals the private key by arithmetic, exactly what virtual-machine snapshot rollback causes. With PSS, repeated salt yields one extra valid signature and nothing more. See docs/format.md, “VERSION 3 OPENED”, item 7.

Verifier: rsa::verify_pss_sha256, in pure Rust: oc-format verifies the signature and must build for wasm32-unknown-unknown.

Used only by mutable-region tag 6. This number is invalid in suite.sig_alg: that field specifies the AUTHOR signature, frozen in version 1 as Ed25519. Header parsing checks placement: ensure_supported answers “can we execute it”, not “does it belong here”.

Implementations

impl SigAlg

pub fn ensure_supported(self) -> Result<(), CryptoError>

Whether the build can execute the declared algorithm.

A second boundary, like aead::ensure_supported and merkle::ensure_supported. Without it, an identifier in a signed header controls nothing: a file declaring RSA-PSS would still be verified as Ed25519 and accepted. This is the same defect class that produced alg: none in JWS.

The match deliberately has no _: adding a member must break the build here, beside verification, rather than pass silently.

pub fn from_u8(v: u8) -> Result<Self, CryptoError>

Parse an identifier from a file.

As with AeadAlg::from_u8, parsing immediately passes through Self::ensure_supported: a header using an unimplemented algorithm must be rejected AT PARSING, not after key agreement and CEK unwrapping.

Trait Implementations

impl Clone for SigAlg

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for SigAlg

impl Debug for SigAlg

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

Formats the value using the given formatter.

impl Eq for SigAlg

impl PartialEq for SigAlg

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for SigAlg