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//===----------------------------------------------------------------------===//
//
// This source file is part of the SwiftASN1 open source project
//
// Copyright (c) 2019-2020 Apple Inc. and the SwiftASN1 project authors
// Licensed under Apache License v2.0
//
// See LICENSE.txt for license information
// See CONTRIBUTORS.txt for the list of SwiftASN1 project authors
//
// SPDX-License-Identifier: Apache-2.0
//
//===----------------------------------------------------------------------===//
import SwiftASN1
struct SubjectPublicKeyInfo: DERImplicitlyTaggable, Hashable {
static var defaultIdentifier: ASN1Identifier {
.sequence
}
var algorithmIdentifier: RFC5480AlgorithmIdentifier
var key: ASN1BitString
init(derEncoded rootNode: ASN1Node, withIdentifier identifier: ASN1Identifier) throws {
// The SPKI block looks like this:
//
// SubjectPublicKeyInfo ::= SEQUENCE {
// algorithm AlgorithmIdentifier,
// subjectPublicKey BIT STRING
// }
self = try DER.sequence(rootNode, identifier: identifier) { nodes in
let algorithmIdentifier = try RFC5480AlgorithmIdentifier(derEncoded: &nodes)
let key = try ASN1BitString(derEncoded: &nodes)
return SubjectPublicKeyInfo(algorithmIdentifier: algorithmIdentifier, key: key)
}
}
private init(algorithmIdentifier: RFC5480AlgorithmIdentifier, key: ASN1BitString) {
self.algorithmIdentifier = algorithmIdentifier
self.key = key
}
internal init(algorithmIdentifier: RFC5480AlgorithmIdentifier, key: [UInt8]) {
self.algorithmIdentifier = algorithmIdentifier
self.key = ASN1BitString(bytes: key[...])
}
func serialize(into coder: inout DER.Serializer, withIdentifier identifier: ASN1Identifier) throws {
try coder.appendConstructedNode(identifier: identifier) { coder in
try coder.serialize(self.algorithmIdentifier)
try coder.serialize(self.key)
}
}
}
struct RFC5480AlgorithmIdentifier: DERImplicitlyTaggable, Hashable {
static var defaultIdentifier: ASN1Identifier {
.sequence
}
var algorithm: ASN1ObjectIdentifier
var parameters: ASN1Any?
init(algorithm: ASN1ObjectIdentifier, parameters: ASN1Any?) {
self.algorithm = algorithm
self.parameters = parameters
}
init(derEncoded rootNode: ASN1Node, withIdentifier identifier: ASN1Identifier) throws {
// The AlgorithmIdentifier block looks like this.
//
// AlgorithmIdentifier ::= SEQUENCE {
// algorithm OBJECT IDENTIFIER,
// parameters ANY DEFINED BY algorithm OPTIONAL
// }
//
// ECParameters ::= CHOICE {
// namedCurve OBJECT IDENTIFIER
// -- implicitCurve NULL
// -- specifiedCurve SpecifiedECDomain
// }
//
// We don't bother with helpers: we just try to decode it directly.
self = try DER.sequence(rootNode, identifier: identifier) { nodes in
let algorithmOID = try ASN1ObjectIdentifier(derEncoded: &nodes)
let parameters = nodes.next().map { ASN1Any(derEncoded: $0) }
return .init(algorithm: algorithmOID, parameters: parameters)
}
}
func serialize(into coder: inout DER.Serializer, withIdentifier identifier: ASN1Identifier) throws {
try coder.appendConstructedNode(identifier: identifier) { coder in
try coder.serialize(self.algorithm)
if let parameters = self.parameters {
try coder.serialize(parameters)
}
}
}
}
// MARK: Algorithm Identifier Statics
extension RFC5480AlgorithmIdentifier {
static let ecdsaP256 = RFC5480AlgorithmIdentifier(
algorithm: .AlgorithmIdentifier.idEcPublicKey,
parameters: try! .init(erasing: ASN1ObjectIdentifier.NamedCurves.secp256r1)
)
static let ecdsaP384 = RFC5480AlgorithmIdentifier(
algorithm: .AlgorithmIdentifier.idEcPublicKey,
parameters: try! .init(erasing: ASN1ObjectIdentifier.NamedCurves.secp384r1)
)
static let ecdsaP521 = RFC5480AlgorithmIdentifier(
algorithm: .AlgorithmIdentifier.idEcPublicKey,
parameters: try! .init(erasing: ASN1ObjectIdentifier.NamedCurves.secp521r1)
)
}
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