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|
use der::{
asn1::{AnyRef, ObjectIdentifier},
DecodeValue, EncodeValue, FixedTag, Header, Length, Reader, Tag, Writer,
};
/// Elliptic curve parameters as described in
/// [RFC5480 Section 2.1.1](https://datatracker.ietf.org/doc/html/rfc5480#section-2.1.1):
///
/// ```text
/// ECParameters ::= CHOICE {
/// namedCurve OBJECT IDENTIFIER
/// -- implicitCurve NULL
/// -- specifiedCurve SpecifiedECDomain
/// }
/// -- implicitCurve and specifiedCurve MUST NOT be used in PKIX.
/// -- Details for SpecifiedECDomain can be found in [X9.62].
/// -- Any future additions to this CHOICE should be coordinated
/// -- with ANSI X9.
/// ```
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub enum EcParameters {
/// Elliptic curve named by a particular OID.
///
/// > namedCurve identifies all the required values for a particular
/// > set of elliptic curve domain parameters to be represented by an
/// > object identifier.
NamedCurve(ObjectIdentifier),
}
impl<'a> DecodeValue<'a> for EcParameters {
fn decode_value<R: Reader<'a>>(decoder: &mut R, header: Header) -> der::Result<Self> {
ObjectIdentifier::decode_value(decoder, header).map(Self::NamedCurve)
}
}
impl EncodeValue for EcParameters {
fn value_len(&self) -> der::Result<Length> {
match self {
Self::NamedCurve(oid) => oid.value_len(),
}
}
fn encode_value(&self, writer: &mut impl Writer) -> der::Result<()> {
match self {
Self::NamedCurve(oid) => oid.encode_value(writer),
}
}
}
impl EcParameters {
/// Obtain the `namedCurve` OID.
pub fn named_curve(self) -> Option<ObjectIdentifier> {
match self {
Self::NamedCurve(oid) => Some(oid),
}
}
}
impl<'a> From<&'a EcParameters> for AnyRef<'a> {
fn from(params: &'a EcParameters) -> AnyRef<'a> {
match params {
EcParameters::NamedCurve(oid) => oid.into(),
}
}
}
impl From<ObjectIdentifier> for EcParameters {
fn from(oid: ObjectIdentifier) -> EcParameters {
EcParameters::NamedCurve(oid)
}
}
impl FixedTag for EcParameters {
const TAG: Tag = Tag::ObjectIdentifier;
}
|
