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//===----------------------------------------------------------------------===//
//
// This source file is part of the SwiftCertificates open source project
//
// Copyright (c) 2023 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
/// ``OCSPNonce`` is defined in ASN.1 as:
/// ```
/// Nonce ::= OCTET STRING(SIZE(1..32))
/// ```
/// RFC: https://www.rfc-editor.org/rfc/rfc8954.html
struct OCSPNonce: DERImplicitlyTaggable, Hashable, Sendable {
static var defaultIdentifier: ASN1Identifier {
ASN1OctetString.defaultIdentifier
}
var rawValue: ASN1OctetString
init() {
var generator = SystemRandomNumberGenerator()
self.init(generator: &generator)
}
init(generator: inout some RandomNumberGenerator) {
self.rawValue = .init(contentBytes: generator.bytes(count: 32))
}
init(_ ext: Certificate.Extension) throws {
guard ext.oid == .OCSPExtensionID.nonceIdentifier else {
throw CertificateError.incorrectOIDForExtension(
reason: "Expected \(ASN1ObjectIdentifier.OCSPExtensionID.nonceIdentifier), got \(ext.oid)"
)
}
try self.init(derEncoded: ext.value)
}
init(derEncoded rootNode: ASN1Node, withIdentifier identifier: ASN1Identifier) throws {
self.rawValue = try ASN1OctetString(derEncoded: rootNode, withIdentifier: identifier)
guard (1...32).contains(self.rawValue.bytes.count) else {
throw ASN1Error.unsupportedFieldLength(
reason: "OCSP Nonce has invalid number of bytes: \(self.rawValue.bytes.count)"
)
}
}
func serialize(into coder: inout DER.Serializer, withIdentifier identifier: ASN1Identifier) throws {
try rawValue.serialize(into: &coder, withIdentifier: identifier)
}
}
extension ASN1ObjectIdentifier.OCSPExtensionID {
static let nonceIdentifier: ASN1ObjectIdentifier = [1, 3, 6, 1, 5, 5, 7, 48, 1, 2]
}
extension Certificate.Extension {
/// Construct an opaque ``Certificate/Extension`` from this Key Usage extension.
///
/// - Parameters:
/// - keyUsage: The extension to wrap
/// - critical: Whether this extension should have the critical bit set.
init(_ nonce: OCSPNonce, critical: Bool) throws {
var serializer = DER.Serializer()
try serializer.serialize(nonce)
self.init(oid: .OCSPExtensionID.nonceIdentifier, critical: critical, value: serializer.serializedBytes[...])
}
}
extension OCSPNonce: CertificateExtensionConvertible {
func makeCertificateExtension() throws -> Certificate.Extension {
try .init(self, critical: false)
}
}
extension Certificate.Extensions {
var ocspNonce: OCSPNonce? {
get throws {
try self[oid: .OCSPExtensionID.nonceIdentifier].map { try .init($0) }
}
}
}
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