use DataContractJsonSerializer instead of Newtonsoft.Json

.gitignore

@@ -163,3 +163,6 @@ pip-log.txt
 # Mac crap
 .DS_Store
 Posh-SSH.zip
+
+Source/**/bin/**
+Source/**/obj/**

Source/PoshSSH/PoshSSH.Core/PoshSSH.Core.csproj

@@ -33,7 +33,6 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
     <PackageReference Include="SshNet.Security.Cryptography">
       <Version>1.3.0</Version>
     </PackageReference>

Source/PoshSSH/PoshSSH.Core/bin/Debug/netstandard2.0/PoshSSH.deps.json

@@ -0,0 +1,98 @@
+{
+  "runtimeTarget": {
+    "name": ".NETStandard,Version=v2.0/",
+    "signature": "1c29894f4e98a18a46b4ef3d88fe6ab552e3c6d5"
+  },
+  "compilationOptions": {},
+  "targets": {
+    ".NETStandard,Version=v2.0": {},
+    ".NETStandard,Version=v2.0/": {
+      "PoshSSH/1.0.0": {
+        "dependencies": {
+          "NETStandard.Library": "2.0.3",
+          "PowerShellStandard.Library": "5.1.1",
+          "SSH.NET": "2020.0.2",
+          "SshNet.Security.Cryptography": "1.3.0"
+        },
+        "runtime": {
+          "PoshSSH.dll": {}
+        }
+      },
+      "Microsoft.NETCore.Platforms/1.1.0": {},
+      "NETStandard.Library/2.0.3": {
+        "dependencies": {
+          "Microsoft.NETCore.Platforms": "1.1.0"
+        }
+      },
+      "PowerShellStandard.Library/5.1.1": {
+        "runtime": {
+          "lib/netstandard2.0/System.Management.Automation.dll": {
+            "assemblyVersion": "3.0.0.0",
+            "fileVersion": "5.1.1.0"
+          }
+        }
+      },
+      "SSH.NET/2020.0.2": {
+        "dependencies": {
+          "SshNet.Security.Cryptography": "1.3.0"
+        },
+        "runtime": {
+          "lib/netstandard2.0/Renci.SshNet.dll": {
+            "assemblyVersion": "2020.0.2.0",
+            "fileVersion": "2020.0.2.0"
+          }
+        }
+      },
+      "SshNet.Security.Cryptography/1.3.0": {
+        "runtime": {
+          "lib/netstandard2.0/SshNet.Security.Cryptography.dll": {
+            "assemblyVersion": "1.3.0.0",
+            "fileVersion": "1.3.0.0"
+          }
+        }
+      }
+    }
+  },
+  "libraries": {
+    "PoshSSH/1.0.0": {
+      "type": "project",
+      "serviceable": false,
+      "sha512": ""
+    },
+    "Microsoft.NETCore.Platforms/1.1.0": {
+      "type": "package",
+      "serviceable": true,
+      "sha512": "sha512-kz0PEW2lhqygehI/d6XsPCQzD7ff7gUJaVGPVETX611eadGsA3A877GdSlU0LRVMCTH/+P3o2iDTak+S08V2+A==",
+      "path": "microsoft.netcore.platforms/1.1.0",
+      "hashPath": "microsoft.netcore.platforms.1.1.0.nupkg.sha512"
+    },
+    "NETStandard.Library/2.0.3": {
+      "type": "package",
+      "serviceable": true,
+      "sha512": "sha512-st47PosZSHrjECdjeIzZQbzivYBJFv6P2nv4cj2ypdI204DO+vZ7l5raGMiX4eXMJ53RfOIg+/s4DHVZ54Nu2A==",
+      "path": "netstandard.library/2.0.3",
+      "hashPath": "netstandard.library.2.0.3.nupkg.sha512"
+    },
+    "PowerShellStandard.Library/5.1.1": {
+      "type": "package",
+      "serviceable": true,
+      "sha512": "sha512-e31xJjG+Kjbv6YF3Yq6D4Dl3or8v7LrNF41k3CXrWozW6hR1zcOe5KYuZJaGSiAgLnwP8wcW+I3+IWEzMPZKXQ==",
+      "path": "powershellstandard.library/5.1.1",
+      "hashPath": "powershellstandard.library.5.1.1.nupkg.sha512"
+    },
+    "SSH.NET/2020.0.2": {
+      "type": "package",
+      "serviceable": true,
+      "sha512": "sha512-G0dNlTBAM00KZXv1wWVwgg26d9/METcM6qWBpNQwllzQmmbu+Zu+FS1L1X4fFgGdPu3e8k9mmTBu6SwtQ0614g==",
+      "path": "ssh.net/2020.0.2",
+      "hashPath": "ssh.net.2020.0.2.nupkg.sha512"
+    },
+    "SshNet.Security.Cryptography/1.3.0": {
+      "type": "package",
+      "serviceable": true,
+      "sha512": "sha512-5pBIXRjcSO/amY8WztpmNOhaaCNHY/B6CcYDI7FSTgqSyo/ZUojlLiKcsl+YGbxQuLX439qIkMfP0PHqxqJi/Q==",
+      "path": "sshnet.security.cryptography/1.3.0",
+      "hashPath": "sshnet.security.cryptography.1.3.0.nupkg.sha512"
+    }
+  }
+}

Source/PoshSSH/PoshSSH/Stores/JsonStore.cs

@@ -3,7 +3,7 @@
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
-using Newtonsoft.Json;
+using System.Runtime.Serialization.Json;
 
 namespace SSH.Stores
 {
@@ -14,34 +14,48 @@ public class ConfigFileStruct
     public class JsonStore : MemoryStore
     {
         private readonly string FileName;
+        private readonly DataContractJsonSerializerSettings serializationSettings;
 
         public JsonStore(string fileName)
         {
             FileName = fileName;
+            serializationSettings = new DataContractJsonSerializerSettings { UseSimpleDictionaryFormat = true };
         }
 
         public void LoadFromDisk()
         {
             if (File.Exists(FileName))
             {
-                var jsonString = File.ReadAllText(FileName);
-                var keys = JsonConvert.DeserializeObject<ConfigFileStruct>(jsonString).Keys;
-                HostKeys = new ConcurrentDictionary<string, KnownHostValue>(keys);
+                using (var stream = File.OpenRead(FileName))
+                {
+                    var serializer = new DataContractJsonSerializer(typeof(ConfigFileStruct), serializationSettings);
+                    var keys = (ConfigFileStruct)serializer.ReadObject(stream);
+                    if (Equals(keys, null)) throw new Exception();
+                    HostKeys = new ConcurrentDictionary<string, KnownHostValue>(keys.Keys);
+                }
             }
         }
 
         private void WriteToDisk()
         {
-            var jsonString = JsonConvert.SerializeObject(new ConfigFileStruct()
-                {
-                    Keys = HostKeys.ToDictionary(x => x.Key, x => x.Value)
-                },
-                Formatting.Indented
-            );
             var d = Directory.CreateDirectory(Path.GetDirectoryName(FileName));
             if (d.Exists)
             {
-                File.WriteAllText(FileName, jsonString);
+                using (var stream = File.Open(FileName, FileMode.Create, FileAccess.Write, FileShare.Read))
+                {
+                    using (var writer = JsonReaderWriterFactory.CreateJsonWriter(
+                        stream, System.Text.Encoding.UTF8, true, true, "  "))
+                    {
+                        var serializer = new DataContractJsonSerializer(typeof(ConfigFileStruct), serializationSettings);
+                        serializer.WriteObject(writer,
+                            new ConfigFileStruct()
+                            {
+                                Keys = HostKeys.ToDictionary(x => x.Key, x => x.Value)
+                            }
+                        );
+                        writer.Flush();
+                    }
+                }
             }
         }