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//===----------------------------------------------------------------------===//
//
// This source file is part of the SwiftCertificates open source project
//
// Copyright (c) 2022 Apple Inc. and the SwiftCertificates project authors
// Licensed under Apache License v2.0
//
// See LICENSE.txt for license information
// See CONTRIBUTORS.txt for the list of SwiftCertificates project authors
//
// SPDX-License-Identifier: Apache-2.0
//
//===----------------------------------------------------------------------===//
import SwiftASN1
/// A CertID is defined as:
///
/// ```
/// CertStatus ::= CHOICE {
/// good [0] IMPLICIT NULL,
/// revoked [1] IMPLICIT RevokedInfo,
/// unknown [2] IMPLICIT UnknownInfo }
///
/// RevokedInfo ::= SEQUENCE {
/// revocationTime GeneralizedTime,
/// revocationReason [0] EXPLICIT CRLReason OPTIONAL }
///
/// UnknownInfo ::= NULL
///
/// CRLReason ::= ENUMERATED {
/// unspecified (0),
/// keyCompromise (1),
/// cACompromise (2),
/// affiliationChanged (3),
/// superseded (4),
/// cessationOfOperation (5),
/// certificateHold (6),
/// -- value 7 is not used
/// removeFromCRL (8),
/// privilegeWithdrawn (9),
/// aACompromise (10) }
/// ```
///
enum OCSPCertStatus: DERParseable, DERSerializable, Hashable {
case good
case revoked(OCSPRevokedInfo)
case unknown
private static let goodIdentifier = ASN1Identifier(tagWithNumber: 0, tagClass: .contextSpecific)
private static let revokedIdentifier = ASN1Identifier(tagWithNumber: 1, tagClass: .contextSpecific)
private static let unknownIdentifier = ASN1Identifier(tagWithNumber: 2, tagClass: .contextSpecific)
init(derEncoded node: ASN1Node) throws {
switch node.identifier {
case OCSPCertStatus.goodIdentifier:
_ = try ASN1Null(derEncoded: node, withIdentifier: OCSPCertStatus.goodIdentifier)
self = .good
case OCSPCertStatus.revokedIdentifier:
self = try .revoked(.init(derEncoded: node, withIdentifier: OCSPCertStatus.revokedIdentifier))
case OCSPCertStatus.unknownIdentifier:
_ = try ASN1Null(derEncoded: node, withIdentifier: OCSPCertStatus.unknownIdentifier)
self = .unknown
default:
throw ASN1Error.unexpectedFieldType(node.identifier)
}
}
func serialize(into coder: inout DER.Serializer) throws {
switch self {
case .good:
ASN1Null().serialize(into: &coder, withIdentifier: OCSPCertStatus.goodIdentifier)
case .revoked(let revokedInfo):
try revokedInfo.serialize(into: &coder, withIdentifier: OCSPCertStatus.revokedIdentifier)
case .unknown:
ASN1Null().serialize(into: &coder, withIdentifier: OCSPCertStatus.unknownIdentifier)
}
}
}
struct OCSPRevokedInfo: DERImplicitlyTaggable, Hashable {
static var defaultIdentifier: ASN1Identifier {
.sequence
}
var revocationTime: GeneralizedTime
var revocationReason: CRLReason?
init(revocationTime: GeneralizedTime, revocationReason: CRLReason?) {
self.revocationTime = revocationTime
self.revocationReason = revocationReason
}
init(derEncoded rootNode: ASN1Node, withIdentifier identifier: ASN1Identifier) throws {
self = try DER.sequence(rootNode, identifier: identifier) { nodes in
let revocationTime = try GeneralizedTime(derEncoded: &nodes)
let revocationReason = try DER.optionalExplicitlyTagged(&nodes, tagNumber: 0, tagClass: .contextSpecific) {
node in
try CRLReason(derEncoded: node)
}
return .init(revocationTime: revocationTime, revocationReason: revocationReason)
}
}
func serialize(into coder: inout DER.Serializer, withIdentifier identifier: ASN1Identifier) throws {
try coder.appendConstructedNode(identifier: identifier) { coder in
try coder.serialize(self.revocationTime)
if let revocationReason = self.revocationReason {
try coder.serialize(revocationReason, explicitlyTaggedWithTagNumber: 0, tagClass: .contextSpecific)
}
}
}
}
struct CRLReason: DERImplicitlyTaggable, Hashable, RawRepresentable {
static var defaultIdentifier: ASN1Identifier {
.enumerated
}
var rawValue: Int
init(rawValue: Int) {
self.rawValue = rawValue
}
init(derEncoded rootNode: ASN1Node, withIdentifier identifier: ASN1Identifier) throws {
self.rawValue = try .init(derEncoded: rootNode, withIdentifier: identifier)
}
func serialize(into coder: inout DER.Serializer, withIdentifier identifier: ASN1Identifier) throws {
try self.rawValue.serialize(into: &coder, withIdentifier: identifier)
}
static let unspecified = CRLReason(rawValue: 0)
static let keyCompromise = CRLReason(rawValue: 1)
static let caCompromise = CRLReason(rawValue: 2)
static let affiliationChanged = CRLReason(rawValue: 3)
static let superseded = CRLReason(rawValue: 4)
static let cessationOfOperation = CRLReason(rawValue: 5)
static let certificateHold = CRLReason(rawValue: 6)
static let removeFromCRL = CRLReason(rawValue: 8)
static let privilegeWithdrawn = CRLReason(rawValue: 9)
static let aaCompromise = CRLReason(rawValue: 10)
}
extension CRLReason: CustomStringConvertible {
var description: String {
switch rawValue {
case 0: return "unspecified"
case 1: return "keyCompromise"
case 2: return "caCompromise"
case 3: return "affiliationChanged"
case 4: return "superseded"
case 5: return "cessationOfOperation"
case 6: return "certificateHold"
case 8: return "removeFromCRL"
case 9: return "privilegeWithdrawn"
case 10: return "aaCompromise"
default: return "unknown reason \(rawValue)"
}
}
}
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