pub fn encode(key: &Sm2PublicKey) -> Vec<u8>Expand description
Encode an SM2 public key as a DER SubjectPublicKeyInfo blob.
Caller pre-validates that the key’s point is on-curve and not at
infinity. (The standard accessor
crate::sm2::Sm2PublicKey::to_sec1_uncompressed feeds this
helper after extracting the affine (x, y).)
§Panics
Panics if the underlying point is at infinity (callers must reject the identity point at the boundary).