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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 {
static var keyByteCount: Int {
return 32
}
}
extension Curve25519 {
/// A mechanism used to create a shared secret between two users by
/// performing X25519 key agreement.
public enum KeyAgreement {
#if !CRYPTO_IN_SWIFTPM_FORCE_BUILD_API
typealias Curve25519PrivateKeyImpl = Curve25519.KeyAgreement.CoreCryptoCurve25519PrivateKeyImpl
typealias Curve25519PublicKeyImpl = Curve25519.KeyAgreement.CoreCryptoCurve25519PublicKeyImpl
#else
typealias Curve25519PrivateKeyImpl = Curve25519.KeyAgreement.OpenSSLCurve25519PrivateKeyImpl
typealias Curve25519PublicKeyImpl = Curve25519.KeyAgreement.OpenSSLCurve25519PublicKeyImpl
#endif
/// A Curve25519 public key used for key agreement.
public struct PublicKey: ECPublicKey {
fileprivate var baseKey: Curve25519PublicKeyImpl
/// Creates a Curve25519 public key for key agreement from a
/// collection of bytes.
///
/// - Parameters:
/// - rawRepresentation: A raw representation of the key as a
/// collection of contiguous bytes.
public init<D: ContiguousBytes>(rawRepresentation: D) throws {
self.baseKey = try Curve25519PublicKeyImpl(rawRepresentation: rawRepresentation)
}
fileprivate init(baseKey: Curve25519PublicKeyImpl) {
self.baseKey = baseKey
}
/// A representation of the Curve25519 public key as a collection of
/// bytes.
public var rawRepresentation: Data {
return self.baseKey.rawRepresentation
}
var keyBytes: [UInt8] {
return self.baseKey.keyBytes
}
private func withUnsafeBytes<R>(_ body: (UnsafeRawBufferPointer) throws -> R) rethrows -> R {
return try self.baseKey.keyBytes.withUnsafeBytes(body)
}
}
/// A Curve25519 private key used for key agreement.
public struct PrivateKey: DiffieHellmanKeyAgreement {
fileprivate var baseKey: Curve25519PrivateKeyImpl
/// Creates a random Curve25519 private key for key agreement.
public init() {
self.baseKey = Curve25519PrivateKeyImpl()
}
/// The corresponding public key.
public var publicKey: Curve25519.KeyAgreement.PublicKey {
return PublicKey(baseKey: self.baseKey.publicKey)
}
/// Creates a Curve25519 private key for key agreement from a
/// collection of bytes.
///
/// - Parameters:
/// - rawRepresentation: A raw representation of the key as a
/// collection of contiguous bytes.
public init<D: ContiguousBytes>(rawRepresentation: D) throws {
self.baseKey = try Curve25519PrivateKeyImpl(rawRepresentation: rawRepresentation)
}
/// Computes a shared secret with the provided public key from
/// another party.
///
/// - Parameters:
/// - publicKeyShare: The public key from another party to be
/// combined with the private key from this user to create the
/// shared secret.
///
/// - Returns: The computed shared secret.
public func sharedSecretFromKeyAgreement(with publicKeyShare: Curve25519.KeyAgreement.PublicKey) throws -> SharedSecret {
return try self.baseKey.sharedSecretFromKeyAgreement(with: publicKeyShare.baseKey)
}
/// The raw representation of the key as a collection of contiguous
/// bytes.
public var rawRepresentation: Data {
return self.baseKey.rawRepresentation
}
var key: SecureBytes {
return self.baseKey.key
}
}
}
}
#endif // Linux or !SwiftPM
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