Support for Swift 4.0 and 4.1

Package@swift-4.0.swift

@@ -29,7 +29,7 @@ var targetDependencies: [Target.Dependency] = [.byNameItem(name: "Socket")]
 
 #if os(Linux)
 
-packageDependencies.append(.package(url: "https://github.com/IBM-Swift/OpenSSL.git", from: "2.0.0"))
+packageDependencies.append(.package(url: "https://github.com/IBM-Swift/OpenSSL.git", from: "1.0.0"))
 targetDependencies.append(.byNameItem(name: "OpenSSL"))
 
 #endif

Package@swift-4.1.swift

@@ -29,7 +29,7 @@ var targetDependencies: [Target.Dependency] = [.byNameItem(name: "Socket")]
 
 #if os(Linux)
 
-packageDependencies.append(.package(url: "https://github.com/IBM-Swift/OpenSSL.git", from: "2.0.0"))
+packageDependencies.append(.package(url: "https://github.com/IBM-Swift/OpenSSL.git", from: "1.0.0"))
 targetDependencies.append(.byNameItem(name: "OpenSSL"))
 
 #endif

Sources/SSLService/SSLPointerTricks.swift

@@ -0,0 +1,66 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is taken from SwiftNIO open source project
+//
+// Copyright (c) 2017-2018 Apple Inc. and the SwiftNIO project authors
+// Licensed under Apache License v2.0
+//
+//===----------------------------------------------------------------------===//
+
+
+extension UnsafePointer {
+    init(_ ptr: UnsafePointer<Pointee>) {
+        self = ptr
+    }
+
+    static func make(optional ptr: UnsafePointer<Pointee>?) -> UnsafePointer<Pointee>? {
+        return ptr.map(UnsafePointer<Pointee>.init)
+    }
+
+    static func make(optional ptr: OpaquePointer?) -> UnsafePointer<Pointee>? {
+        return ptr.map(UnsafePointer<Pointee>.init)
+    }
+}
+
+extension UnsafeMutablePointer {
+    init(_ ptr: UnsafeMutableRawPointer) {
+        let x = UnsafeMutablePointer<Pointee>(bitPattern: UInt(bitPattern: ptr))!
+        self = x
+    }
+
+    static func make(optional ptr: UnsafeMutablePointer<Pointee>?) -> UnsafeMutablePointer<Pointee>? {
+        return ptr.map(UnsafeMutablePointer<Pointee>.init)
+    }
+
+    static func make(optional ptr: UnsafeMutableRawPointer?) -> UnsafeMutablePointer<Pointee>? {
+        return ptr.map(UnsafeMutablePointer<Pointee>.init)
+    }
+
+    static func make(optional ptr: OpaquePointer?) -> UnsafeMutablePointer<Pointee>? {
+        return ptr.map(UnsafeMutablePointer<Pointee>.init)
+    }
+}
+
+extension UnsafeMutableRawPointer {
+    static func make(optional ptr: OpaquePointer?) -> UnsafeMutableRawPointer? {
+        return ptr.map(UnsafeMutableRawPointer.init)
+    }
+}
+
+extension OpaquePointer {
+    init(_ ptr: OpaquePointer) {
+        self = ptr
+    }
+
+    static func make(optional ptr: OpaquePointer?) -> OpaquePointer? {
+        return ptr.map(OpaquePointer.init)
+    }
+
+    static func make(optional ptr: UnsafeMutableRawPointer?) -> OpaquePointer? {
+        return ptr.map(OpaquePointer.init)
+    }
+
+    static func make<Pointee>(optional ptr: UnsafeMutablePointer<Pointee>?) -> OpaquePointer? {
+        return ptr.map(OpaquePointer.init)
+    }
+}