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//===----------------------------------------------------------------------===//
//
// This source file is part of the SwiftCrypto open source project
//
// Copyright (c) 2019-2020 Apple Inc. and the SwiftCrypto project authors
// Licensed under Apache License v2.0
//
// See LICENSE.txt for license information
// See CONTRIBUTORS.md for the list of SwiftCrypto project authors
//
// SPDX-License-Identifier: Apache-2.0
//
//===----------------------------------------------------------------------===//
#if CRYPTO_IN_SWIFTPM && !CRYPTO_IN_SWIFTPM_FORCE_BUILD_API
@_exported import CryptoKit
#else
import Foundation
extension ASN1 {
/// An ECDSA signature is laid out as follows:
///
/// ECDSASignature ::= SEQUENCE {
/// r INTEGER,
/// s INTEGER
/// }
///
/// This type is generic because our different backends want to use different bignum representations.
struct ECDSASignature<IntegerType: ASN1IntegerRepresentable>: ASN1ImplicitlyTaggable {
static var defaultIdentifier: ASN1.ASN1Identifier {
.sequence
}
var r: IntegerType
var s: IntegerType
init(r: IntegerType, s: IntegerType) {
self.r = r
self.s = s
}
init(asn1Encoded rootNode: ASN1.ASN1Node, withIdentifier identifier: ASN1.ASN1Identifier) throws {
self = try ASN1.sequence(rootNode, identifier: identifier) { nodes in
let r = try IntegerType(asn1Encoded: &nodes)
let s = try IntegerType(asn1Encoded: &nodes)
return ECDSASignature(r: r, s: s)
}
}
func serialize(into coder: inout ASN1.Serializer, withIdentifier identifier: ASN1.ASN1Identifier) throws {
try coder.appendConstructedNode(identifier: identifier) { coder in
try coder.serialize(self.r)
try coder.serialize(self.s)
}
}
}
}
#endif // Linux or !SwiftPM
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