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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 Curve25519.KeyAgreement.PrivateKey: HPKEDiffieHellmanPrivateKeyGeneration {}
extension Curve25519.KeyAgreement.PublicKey: HPKEDiffieHellmanPublicKey {
/// The type of the ephemeral private key associated with this public key.
public typealias EphemeralPrivateKey = Curve25519.KeyAgreement.PrivateKey
static func validateCiphersuite(_ kem: HPKE.KEM) throws {
switch kem {
case .Curve25519_HKDF_SHA256: do {}
default: do {
throw HPKE.Errors.inconsistentCiphersuiteAndKey
}
}
}
/// Creates a Curve25519 elliptic curve public key for use with Diffie-Hellman key exchange.
///
/// - Parameters:
/// - serialization: The serialized bytes of the public key.
/// - kem: The key encapsulation mechanism to use with the public key.
///
/// - Throws: ``CryptoKit/HPKE/Errors/inconsistentCiphersuiteAndKey`` if the key encapsulation mechanism requested is incompatible with this public key.
public init<D>(_ serialization: D, kem: HPKE.KEM) throws where D: ContiguousBytes {
try Self.validateCiphersuite(kem)
try self.init(rawRepresentation: serialization)
}
/// Creates a serialized representation of the public key.
///
/// - Parameters:
/// - kem: The Key Encapsulation Mechanism to use with the public key.
///
/// - Throws: ``CryptoKit/HPKE/Errors/inconsistentCiphersuiteAndKey`` if the key encapsulation mechanism requested is incompatible with this public key.
///
/// - Returns: The serialized representation of the public key.
public func hpkeRepresentation(kem: HPKE.KEM) throws -> Data {
try Self.validateCiphersuite(kem)
return self.rawRepresentation
}
/// The type of the ephemeral private key associated with this public key.
public typealias HPKEEphemeralPrivateKey = Curve25519.KeyAgreement.PrivateKey
}
#endif // Linux or !SwiftPM
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