Update packageManager & add CryptoSwift

.swiftpm/xcode/package.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEWorkspaceSharedSettings_AutocreateContextsIfNeeded</key>
+	<true/>
+</dict>
+</plist>

Package.resolved

@@ -0,0 +1,16 @@
+{
+  "object": {
+    "pins": [
+      {
+        "package": "CryptoSwift",
+        "repositoryURL": "https://github.com/krzyzanowskim/CryptoSwift.git",
+        "state": {
+          "branch": null,
+          "revision": "a44caef0550c346e0ab9172f7c9a3852c1833599",
+          "version": "1.3.0"
+        }
+      }
+    ]
+  },
+  "version": 1
+}

Package.swift

@@ -8,15 +8,16 @@ let package = Package(
     dependencies: [
         // Dependencies declare other packages that this package depends on.
         // .package(url: /* package url */, from: "1.0.0"),
+        .package(url: "https://github.com/krzyzanowskim/CryptoSwift.git", from: "1.0.0"),
     ],
     targets: [
         // Targets are the basic building blocks of a package. A target can define a module or a test suite.
         // Targets can depend on other targets in this package, and on products in packages which this package depends on.
         .target(
             name: "Blockchain",
-            dependencies: []),
+            dependencies: ["CryptoSwift"]),
         .testTarget(
             name: "BlockchainTests",
-            dependencies: ["Blockchain"]),
+            dependencies: ["Blockchain", "CryptoSwift"]),
     ]
 )

Sources/Blockchain/Models/Block.swift

@@ -7,6 +7,7 @@
 //
 
 import Foundation
+import CryptoSwift
 
 class Block {
     var hash: String!
@@ -15,6 +16,6 @@ class Block {
     var index: Int!
     
     func generateHash() -> String {
-        return NSUUID().uuidString.replacingOccurrences(of: "-", with: "")
+        return data.sha256()
     }
 }