FrostFS.SDK.sln

@@ -29,9 +29,8 @@ Global
 		{5012EF96-9C9E-4E77-BC78-B4111EE54107}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{5012EF96-9C9E-4E77-BC78-B4111EE54107}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{5012EF96-9C9E-4E77-BC78-B4111EE54107}.Release|Any CPU.Build.0 = Release|Any CPU
-		{B738F3E1-654D-41A3-B068-58ED122BB688}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+	EndGlobalSection
-		{B738F3E1-654D-41A3-B068-58ED122BB688}.Debug|Any CPU.Build.0 = Debug|Any CPU
+	GlobalSection(SolutionProperties) = preSolution
-		{B738F3E1-654D-41A3-B068-58ED122BB688}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		HideSolutionNode = FALSE
-		{B738F3E1-654D-41A3-B068-58ED122BB688}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 EndGlobal

README.md

@@ -26,7 +26,7 @@ using FrostFS.SDK.ModelsV2;
 using FrostFS.SDK.ModelsV2.Enums;
 using FrostFS.SDK.ModelsV2.Netmap;
 
-var fsClient = new Client(<your_key>, <your_host>);
+var fsClient = Client.GetInstance(<your_key>, <your_host>);
 
 // List containers
 var containersIds = await fsClient.ListContainersAsync();
@@ -55,7 +55,7 @@ using FrostFS.SDK.ModelsV2;
 using FrostFS.SDK.ModelsV2.Enums;
 using FrostFS.SDK.ModelsV2.Netmap;
 
-var fsClient = new Client(<your_key>, <your_host>);
+var fsClient = Client.GetInstance(<your_key>, <your_host>);
 
 // Search regular objects
 var objectsIds = await fsClient.SearchObjectAsync(
@@ -78,3 +78,76 @@ var objHeader = await fsClient.GetObjectHeadAsync(cId, oId);
 // Get object
 var obj = await fsClient.GetObjectAsync(cId, oId);
 ```
+
+### Custom client cut
+```csharp
+
+using FrostFS.SDK.ClientV2;
+using FrostFS.SDK.ModelsV2;
+using FrostFS.SDK.ModelsV2.Enums;
+using FrostFS.SDK.ModelsV2.Netmap;
+using FrostFS.SDK.ClientV2.Extensions;
+using FrostFS.SDK.ClientV2.Interfaces;
+
+var fsClient = Client.GetInstance(<your_key>, <your_host>);
+
+ContainerId containerId = <containerId>;
+string fileName = <fileName>;
+
+await PutObjectClientCut(fsClient, containerId, fileName);
+
+static async Task<ObjectId?> PutObjectClientCut(IFrostFSClient fsClient, ContainerId containerId, string fileName)
+{
+    List<ObjectId> sentObjectIds = [];
+    FrostFS.SDK.ModelsV2.Object? currentObject;
+
+    var partSize = 1024 * 1024;
+    var buffer = new byte[partSize];
+
+    var largeObject = new LargeObject(containerId);
+    
+    var split = new Split();
+   
+    var fileInfo = new FileInfo(fileName);
+    var fullLength = (ulong)fileInfo.Length;
+    var fileNameAttribute = new ObjectAttribute("fileName", fileInfo.Name);
+    
+    using var stream = File.OpenRead(fileName);
+    while (true)
+    {
+        var bytesCount = await stream.ReadAsync(buffer.AsMemory(0, partSize));
+
+        split.Previous = sentObjectIds.LastOrDefault();
+
+        largeObject.AppendBlock(buffer, bytesCount);
+     
+        currentObject = new FrostFS.SDK.ModelsV2.Object(containerId, buffer)
+            .AddAttribute(fileNameAttribute)
+            .SetSplit(split);
+   
+        if (largeObject.PayloadLength == fullLength)
+            break;
+
+        var objectId = await fsClient.PutSingleObjectAsync(currentObject);
+        sentObjectIds.Add(objectId);
+    }
+
+    if (sentObjectIds.Any())
+    {
+        largeObject.CalculateHash();
+
+        var linkObject = new LinkObject(containerId, split.SplitId, largeObject)
+            .AddChildren(sentObjectIds);
+
+        _ = await fsClient.PutSingleObjectAsync(linkObject);
+
+        currentObject.SetParent(largeObject);
+       _ = await fsClient.PutSingleObjectAsync(currentObject);
+
+        return currentObject.GetParentId();
+    }
+
+     return await fsClient.PutSingleObjectAsync(currentObject);
+}
+
+```

src/FrostFS.SDK.ClientV2/Client.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Security.Cryptography;
+using System.Threading.Tasks;
 using FrostFS.Container;
 using FrostFS.Netmap;
 using FrostFS.Object;
@@ -25,7 +26,12 @@ public partial class Client: IFrostFSClient
     private ObjectService.ObjectServiceClient? _objectServiceClient;
     private SessionService.SessionServiceClient? _sessionServiceClient;
 
-    public Client(string key, string host)
+    public static IFrostFSClient GetInstance(string key, string host)
+    {
+        return new Client(key, host);
+    }
+
+    private Client(string key, string host)
     {
         // TODO: Развязать клиент и реализацию GRPC
         _key = key.LoadWif();

src/FrostFS.SDK.ClientV2/Extensions/Object.cs

@@ -0,0 +1,44 @@
+
+using System.Collections.Generic;
+using FrostFS.SDK.ModelsV2;
+
+namespace FrostFS.SDK.ClientV2.Extensions;
+
+public static class Extensions
+{
+    public static ModelsV2.Object SetPayloadLength(this ModelsV2.Object obj, ulong length)
+    {
+        obj.Header.PayloadLength = length;
+        return obj;
+    }
+
+    public static ModelsV2.Object AddAttribute(this ModelsV2.Object obj, string key, string value)
+    {
+        obj.AddAttribute(new ObjectAttribute(key, value));
+        return obj;
+    }
+
+    public static ModelsV2.Object AddAttribute(this ModelsV2.Object obj, ObjectAttribute attribute)
+    {
+        obj.Header.Attributes.Add(attribute);
+        return obj;
+    }
+
+    public static ModelsV2.Object AddAttributes(this ModelsV2.Object obj, IEnumerable<ObjectAttribute> attributes)
+    {
+        obj.Header.Attributes.AddRange(attributes);
+        return obj;
+    }
+
+    public static ModelsV2.Object SetSplit(this ModelsV2.Object obj, Split split)
+    {
+        obj.Header.Split = split;
+        return obj;
+    }
+
+    public static LinkObject AddChildren(this LinkObject linkObject, IEnumerable<ObjectId> objectIds)
+    {
+        linkObject.Header.Split.Children.AddRange(objectIds);
+        return linkObject;
+    }
+}

src/FrostFS.SDK.ClientV2/FrostFS.SDK.ClientV2.csproj

@@ -8,6 +8,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="8.0.0" />
+    <PackageReference Include="Moq.AutoMock" Version="3.5.0" />
   </ItemGroup>
 
   <ItemGroup>

src/FrostFS.SDK.ClientV2/Interfaces/IFrostFSClient.cs

@@ -9,13 +9,24 @@ namespace FrostFS.SDK.ClientV2.Interfaces;
 public interface IFrostFSClient
 {
     Task<ModelsV2.Container> GetContainerAsync(ContainerId containerId);
+
     IAsyncEnumerable<ContainerId> ListContainersAsync();
+
     Task<ContainerId> CreateContainerAsync(ModelsV2.Container container);
+
     Task DeleteContainerAsync(ContainerId containerId);
+
     Task<ObjectHeader> GetObjectHeadAsync(ContainerId containerId, ObjectId objectId);
+
     Task<ModelsV2.Object> GetObjectAsync(ContainerId containerId, ObjectId objectId);
+
     Task<ObjectId> PutObjectAsync(ObjectHeader header, Stream payload);
+
     Task<ObjectId> PutObjectAsync(ObjectHeader header, byte[] payload);
+
+    Task<ObjectId> PutSingleObjectAsync(ModelsV2.Object obj);
+
     Task DeleteObjectAsync(ContainerId containerId, ObjectId objectId);
+
     IAsyncEnumerable<ObjectId> SearchObjectsAsync(ContainerId cid, params ObjectFilter[] filters);    
 }

src/FrostFS.SDK.ClientV2/Mappers/GRPC/ContainerId.cs

@@ -1,4 +1,5 @@
 using FrostFS.Refs;
+using FrostFS.SDK.Cryptography;
 using FrostFS.SDK.ModelsV2;
 using Google.Protobuf;
 
@@ -10,7 +11,7 @@ public static class ContainerIdMapper
     {
         return new ContainerID
         {
-            Value = ByteString.CopyFrom(containerId.ToHash())
+            Value = ByteString.CopyFrom(Base58.Decode(containerId.Value))
         };
     }
 }

src/FrostFS.SDK.ClientV2/Mappers/GRPC/Object.cs

@@ -1,8 +1,9 @@
 using System;
 using System.Linq;
-
 using FrostFS.Object;
+using FrostFS.SDK.Cryptography;
 using FrostFS.SDK.ModelsV2;
+using Google.Protobuf;
 using MatchType = FrostFS.Object.MatchType;
 using ObjectType = FrostFS.Object.ObjectType;
 
@@ -29,11 +30,20 @@ public static class ObjectFilterMapper
 {
     public static SearchRequest.Types.Body.Types.Filter ToGrpcMessage(this ObjectFilter filter)
     {
-        var objMatchTypeName = Enum.GetName(typeof(MatchType), filter.MatchType) 
+        var objMatchTypeName = filter.MatchType switch
-            ?? throw new ArgumentException($"Unknown MatchType. Value: '{filter.MatchType}'.");
+        {
+            ModelsV2.Enums.ObjectMatchType.Unspecified => MatchType.Unspecified,
+            ModelsV2.Enums.ObjectMatchType.Equals => MatchType.StringEqual,
+            ModelsV2.Enums.ObjectMatchType.NotEquals => MatchType.StringNotEqual,
+            ModelsV2.Enums.ObjectMatchType.KeyAbsent => MatchType.NotPresent,
+            ModelsV2.Enums.ObjectMatchType.StartsWith => MatchType.CommonPrefix,
+
+            _ => throw new ArgumentException($"Unknown MatchType. Value: '{filter.MatchType}'.")
+        };
+
         return new SearchRequest.Types.Body.Types.Filter
         {
-            MatchType = (MatchType)Enum.Parse(typeof(MatchType), objMatchTypeName),
+            MatchType = objMatchTypeName,
             Key = filter.Key,
             Value = filter.Value
         };
@@ -44,13 +54,19 @@ public static class ObjectHeaderMapper
 {
     public static Header ToGrpcMessage(this ObjectHeader header)
     {
-        var objTypeName = Enum.GetName(typeof(ObjectType), header.ObjectType) 
+        var objTypeName = header.ObjectType switch
-            ?? throw new ArgumentException($"Unknown ObjectType. Value: '{header.ObjectType}'.");
+        {
+            ModelsV2.Enums.ObjectType.Regular => ObjectType.Regular,
+            ModelsV2.Enums.ObjectType.Lock => ObjectType.Lock,
+            ModelsV2.Enums.ObjectType.Tombstone => ObjectType.Tombstone,
+            _ => throw new ArgumentException($"Unknown ObjectType. Value: '{header.ObjectType}'.")
+        };
+
         var head = new Header
         {         
-            Attributes = { },
             ContainerId = header.ContainerId.ToGrpcMessage(),
-            ObjectType = (ObjectType)Enum.Parse(typeof(ObjectType), objTypeName)
+            ObjectType = objTypeName,
+            PayloadLength = header.PayloadLength
         };
 
         foreach (var attribute in header.Attributes)
@@ -58,20 +74,42 @@ public static class ObjectHeaderMapper
             head.Attributes.Add(attribute.ToGrpcMessage());
         }
 
+        var split = header.Split;
+        if (split != null)
+        {
+            head.Split = new Header.Types.Split
+            {
+                Parent = split.Parent?.ToGrpcMessage(),
+                ParentSignature = split.ParentSignature?.ToGrpcMessage(),
+                ParentHeader = split.ParentHeader?.ToGrpcMessage(),
+                Previous = split.Previous?.ToGrpcMessage(),
+                SplitId = split.SplitId != null ? ByteString.CopyFrom(split.SplitId.ToBinary()) : null
+            };
+
+            if (split.Children != null && split.Children.Any())
+                head.Split.Children.AddRange(split.Children.Select(id => id.ToGrpcMessage()));
+        }    
+
         return head;
     }
 
     public static ObjectHeader ToModel(this Header header)
     {
-        var objTypeName = Enum.GetName(typeof(ModelsV2.Enums.ObjectType), header.ObjectType) 
+        var objTypeName = header.ObjectType switch
-            ?? throw new ArgumentException($"Unknown ObjectType. Value: '{header.ObjectType}'.");
+        {
+            ObjectType.Regular => ModelsV2.Enums.ObjectType.Regular,
+            ObjectType.Lock => ModelsV2.Enums.ObjectType.Lock,
+            ObjectType.Tombstone => ModelsV2.Enums.ObjectType.Tombstone,
+            _ => throw new ArgumentException($"Unknown ObjectType. Value: '{header.ObjectType}'.")
+        };
+
         return new ObjectHeader(
-            ContainerId.FromHash(header.ContainerId.Value.ToByteArray()),
+            new ContainerId(Base58.Encode(header.ContainerId.Value.ToByteArray())),
-            (ModelsV2.Enums.ObjectType)Enum.Parse(typeof(ModelsV2.Enums.ObjectType), objTypeName),
+            objTypeName,
             header.Attributes.Select(attribute => attribute.ToModel()).ToArray()
         )
         {
-            Size = (long)header.PayloadLength,
+            PayloadLength = header.PayloadLength,
             Version = header.Version.ToModel()
         };
     }
@@ -81,7 +119,7 @@ public static class ObjectMapper
 {
     public static ModelsV2.Object ToModel(this Object.Object obj)
     {
-        return new ModelsV2.Object
+        return new ModelsV2.Object()
         {
             Header = obj.Header.ToModel(),
             ObjectId = ObjectId.FromHash(obj.ObjectId.Value.ToByteArray()),
@@ -89,3 +127,25 @@ public static class ObjectMapper
         };
     }    
 }
+
+public static class SignatureMapper
+{
+    public static Refs.Signature ToGrpcMessage(this Signature signature)
+    {
+        var scheme = signature.Scheme switch
+        {
+            SignatureScheme.EcdsaRfc6979Sha256 => Refs.SignatureScheme.EcdsaRfc6979Sha256,
+            SignatureScheme.EcdsaRfc6979Sha256WalletConnect => Refs.SignatureScheme.EcdsaRfc6979Sha256WalletConnect,
+            SignatureScheme.EcdsaSha512 => Refs.SignatureScheme.EcdsaSha512,
+            _ => throw new ArgumentException(message: $"Unexpected enum value: {signature.Scheme}", paramName: nameof(signature.Scheme))
+        };
+
+        return new Refs.Signature
+        {
+            Key = ByteString.CopyFrom(signature.Key),
+            Scheme = scheme,
+            Sign = ByteString.CopyFrom(signature.Sign)
+        };
+    }
+}
+

src/FrostFS.SDK.ClientV2/Mappers/GRPC/ObjectId.cs

@@ -13,4 +13,9 @@ public static class ObjectIdMapper
             Value = ByteString.CopyFrom(objectId.ToHash())
         };
     }
+
+    public static ObjectId ToModel(this ObjectID objectId)
+    {
+        return ObjectId.FromHash(objectId.Value.ToByteArray());
+    }
 }

src/FrostFS.SDK.ClientV2/RequestSigner.cs

@@ -91,7 +91,7 @@ public static class RequestSigner
         {
             IRequest => new RequestVerificationHeader(),
             IResponse => new ResponseVerificationHeader(),
-            _ => throw new InvalidOperationException("Unsopported message type")
+            _ => throw new InvalidOperationException("Unsupported message type")
         };
       
         var verifyOrigin = message.GetVerificationHeader();

src/FrostFS.SDK.ClientV2/Services/Container.cs

@@ -1,5 +1,6 @@
 using FrostFS.Container;
 using FrostFS.SDK.ClientV2.Mappers.GRPC;
+using FrostFS.SDK.Cryptography;
 using FrostFS.SDK.ModelsV2;
 using System.Collections.Generic;
 using System.Threading.Tasks;
@@ -17,6 +18,7 @@ public partial class Client
                 ContainerId = cid.ToGrpcMessage()
             },
         };
+
         request.AddMetaHeader();
         request.Sign(_key);
         var response = await _containerServiceClient.GetAsync(request);
@@ -33,13 +35,14 @@ public partial class Client
                 OwnerId = OwnerId.ToGrpcMessage()
             }
         };
+        
         request.AddMetaHeader();
         request.Sign(_key);
         var response = await _containerServiceClient.ListAsync(request);
         Verifier.CheckResponse(response);
         foreach (var cid in response.Body.ContainerIds)
         {
-            yield return ContainerId.FromHash(cid.Value.ToByteArray());
+            yield return new ContainerId(Base58.Encode(cid.Value.ToByteArray()));
         }
     }
 
@@ -48,6 +51,7 @@ public partial class Client
         var cntnr = container.ToGrpcMessage(); 
         cntnr.OwnerId = OwnerId.ToGrpcMessage();
         cntnr.Version = Version.ToGrpcMessage();
+        
         var request = new PutRequest
         {
             Body = new PutRequest.Types.Body
@@ -60,7 +64,7 @@ public partial class Client
         request.Sign(_key);
         var response = await _containerServiceClient.PutAsync(request);
         Verifier.CheckResponse(response);
-        return ContainerId.FromHash(response.Body.ContainerId.Value.ToByteArray());
+        return new ContainerId(Base58.Encode(response.Body.ContainerId.Value.ToByteArray()));
     }
 
     public async Task DeleteContainerAsync(ContainerId cid)

src/FrostFS.SDK.ClientV2/Services/Object.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Linq;
 using System.Threading.Tasks;
 
 using Google.Protobuf;
@@ -9,9 +10,10 @@ using FrostFS.Object;
 using FrostFS.Refs;
 using FrostFS.SDK.ClientV2.Mappers.GRPC;
 using FrostFS.SDK.Cryptography;
-using FrostFS.SDK.ModelsV2;
 using FrostFS.Session;
 
+using FrostFS.SDK.ModelsV2;
+
 namespace FrostFS.SDK.ClientV2;
 
 public partial class Client
@@ -32,7 +34,7 @@ public partial class Client
 
         request.AddMetaHeader();
         request.Sign(_key);
-        var response = await _objectServiceClient.HeadAsync(request);
+        var response = await _objectServiceClient!.HeadAsync(request);
         Verifier.CheckResponse(response);
 
         return response.Body.Header.Header.ToModel();
@@ -45,7 +47,6 @@ public partial class Client
         {
             Body = new GetRequest.Types.Body
             {
-                Raw = false,
                 Address = new Address
                 {
                     ContainerId = cid.ToGrpcMessage(),
@@ -76,7 +77,176 @@ public partial class Client
 
     public async Task<ObjectId> PutObjectAsync(ObjectHeader header, byte[] payload)
     {
-        return await PutObject(header, new MemoryStream(payload));
+        using var stream = new MemoryStream(payload);
+        return await PutObject(header, stream);
+    }
+
+    private async Task<ObjectId> PutObject(ObjectHeader header, Stream payload)
+    {
+        var sessionToken = await CreateSessionAsync(uint.MaxValue);
+        var hdr = header.ToGrpcMessage();
+        hdr.OwnerId = OwnerId.ToGrpcMessage();
+        hdr.Version = Version.ToGrpcMessage();
+
+        var oid = new ObjectID
+        {
+            Value = hdr.Sha256()
+        };
+
+        var request = new PutRequest
+        {
+            Body = new PutRequest.Types.Body
+            {
+                Init = new PutRequest.Types.Body.Types.Init
+                {
+                    Header = hdr
+                },
+            }
+        };
+
+        request.AddMetaHeader();
+        request.AddObjectSessionToken(
+            sessionToken,
+            hdr.ContainerId,
+            oid,
+            ObjectSessionContext.Types.Verb.Put,
+            _key
+        );
+
+        request.Sign(_key);
+
+        using var stream = await PutObjectInit(request);
+        var buffer = new byte[Constants.ObjectChunkSize];
+
+        while (true)
+        {
+            var bufferLength = await payload.ReadAsync(buffer, 0, Constants.ObjectChunkSize);
+
+            if (bufferLength == 0)
+                break;
+
+            request.Body = new PutRequest.Types.Body
+            {
+                Chunk = ByteString.CopyFrom(buffer[..bufferLength]),
+            };
+
+            request.VerifyHeader = null;
+            request.Sign(_key);
+            await stream.Write(request);
+        }
+
+        var response = await stream.Close();
+        Verifier.CheckResponse(response);
+
+        return ObjectId.FromHash(response.Body.ObjectId.Value.ToByteArray());
+    }
+
+    public async Task<ObjectId> PutSingleObjectAsync(ModelsV2.Object @object)
+    {
+        var sessionToken = await CreateSessionAsync(uint.MaxValue);
+    
+        var obj = CreateObject(@object);
+
+        var request = new PutSingleRequest
+        {
+            Body = new () { Object = obj }
+        };
+
+        request.AddMetaHeader();
+        request.AddObjectSessionToken(
+            sessionToken,
+            obj.Header.ContainerId,
+            obj.ObjectId,
+            ObjectSessionContext.Types.Verb.Put,
+            _key
+        );
+
+        request.Sign(_key);
+
+        var response = await _objectServiceClient!.PutSingleAsync(request);
+        Verifier.CheckResponse(response);
+        
+        return ObjectId.FromHash(obj.ObjectId.Value.ToByteArray());
+    }
+    
+    public Object.Object CreateObject(ModelsV2.Object @object)
+    {
+        var grpcHeader = @object.Header.ToGrpcMessage();
+       
+        grpcHeader.OwnerId = OwnerId.ToGrpcMessage();
+        grpcHeader.Version = Version.ToGrpcMessage();
+
+        if (@object.Payload != null)
+        {
+            grpcHeader.PayloadLength = (ulong)@object.Payload.Length;
+            grpcHeader.PayloadHash = Sha256Checksum(@object.Payload);
+        }
+
+        var split = @object.Header.Split;
+        if (split != null)
+        {
+            grpcHeader.Split = new Header.Types.Split
+            {
+                SplitId = split.SplitId != null ? ByteString.CopyFrom(split.SplitId.ToBinary()) : null                    
+            };
+
+            if (split.Children != null && split.Children.Any())
+                grpcHeader.Split.Children.AddRange(split.Children.Select(id => id.ToGrpcMessage()));
+
+            if (split.ParentHeader is not null)
+            {
+                var grpcParentHeader = CreateHeader(split.ParentHeader, []);
+
+                grpcHeader.Split.Parent = new ObjectID { Value = grpcParentHeader.Sha256() };
+                grpcHeader.Split.ParentHeader = grpcParentHeader;
+                grpcHeader.Split.ParentSignature = new Refs.Signature
+                {
+                    Key = ByteString.CopyFrom(_key.PublicKey()),
+                    Sign = ByteString.CopyFrom(_key.SignData(grpcHeader.Split.Parent.ToByteArray())),
+                };
+
+                split.Parent = grpcHeader.Split.Parent.ToModel();
+            }
+        }
+
+        var obj = new Object.Object
+        {
+            Header = grpcHeader,
+            ObjectId = new ObjectID { Value = grpcHeader.Sha256() },
+            Payload = ByteString.CopyFrom(@object.Payload)
+        };
+
+        obj.Signature = new Refs.Signature
+        {
+            Key = ByteString.CopyFrom(_key.PublicKey()),
+            Sign = ByteString.CopyFrom(_key.SignData(obj.ObjectId.ToByteArray())),
+        };        
+      
+        return obj;
+    }
+
+    public Header CreateHeader(ObjectHeader header, byte[]? payload)
+    {
+        var grpcHeader = header.ToGrpcMessage();
+       
+        grpcHeader.OwnerId = OwnerId.ToGrpcMessage();
+        grpcHeader.Version = Version.ToGrpcMessage();
+
+        if (header.PayloadCheckSum != null)
+        {
+            grpcHeader.PayloadHash = new Checksum
+            {
+                Type = ChecksumType.Sha256,
+                Sum = ByteString.CopyFrom(header.PayloadCheckSum)
+            };
+         }
+         else 
+         {
+            if (payload != null)    
+                grpcHeader.PayloadHash = Sha256Checksum(payload);
+         }
+
+        return grpcHeader;
     }
 
     public async Task DeleteObjectAsync(ContainerId cid, ObjectId oid)
@@ -95,7 +265,7 @@ public partial class Client
 
         request.AddMetaHeader();
         request.Sign(_key);
-        var response = await _objectServiceClient.DeleteAsync(request);
+        var response = await _objectServiceClient!.DeleteAsync(request);
         Verifier.CheckResponse(response);
     }
 
@@ -153,66 +323,10 @@ public partial class Client
 
         return new ObjectReader
         {
-            Call = _objectServiceClient.Get(initRequest)
+            Call = _objectServiceClient!.Get(initRequest)
         };
     }
 
-    private async Task<ObjectId> PutObject(ObjectHeader header, Stream payload)
-    {
-        var sessionToken = await CreateSessionAsync(uint.MaxValue);
-        var hdr = header.ToGrpcMessage();
-        hdr.OwnerId = OwnerId.ToGrpcMessage();
-        hdr.Version = Version.ToGrpcMessage();
-        
-        var oid = new ObjectID
-        {
-            Value = hdr.Sha256()
-        };
-        
-        var request = new PutRequest
-        {
-            Body = new PutRequest.Types.Body
-            {
-                Init = new PutRequest.Types.Body.Types.Init
-                {
-                    Header = hdr
-                },
-            }
-        };
-
-        request.AddMetaHeader();
-        request.AddObjectSessionToken(
-            sessionToken,
-            hdr.ContainerId,
-            oid,
-            ObjectSessionContext.Types.Verb.Put,
-            _key
-        );
-    
-        request.Sign(_key);
-
-        using var stream = await PutObjectInit(request);
-        var buffer = new byte[Constants.ObjectChunkSize];
-        var bufferLength = await payload.ReadAsync(buffer, 0, Constants.ObjectChunkSize);
-      
-        while (bufferLength > 0)
-        {
-            request.Body = new PutRequest.Types.Body
-            {
-                Chunk = ByteString.CopyFrom(buffer[..bufferLength]),
-            };
-            request.VerifyHeader = null;
-            request.Sign(_key);
-            await stream.Write(request);
-            bufferLength = await payload.ReadAsync(buffer, 0, Constants.ObjectChunkSize);
-        }
-
-        var response = await stream.Close();
-        Verifier.CheckResponse(response);
-
-        return ObjectId.FromHash(response.Body.ObjectId.Value.ToByteArray());
-    }
-
     private async Task<ObjectStreamer> PutObjectInit(PutRequest initRequest)
     {
         if (initRequest is null)
@@ -220,7 +334,7 @@ public partial class Client
             throw new ArgumentNullException(nameof(initRequest));
         }
 
-        var call = _objectServiceClient.Put();
+        var call = _objectServiceClient!.Put();
         await call.RequestStream.WriteAsync(initRequest);
 
         return new ObjectStreamer(call);
@@ -248,6 +362,17 @@ public partial class Client
             throw new ArgumentNullException(nameof(initRequest));
         }
 
-        return new SearchReader(_objectServiceClient.Search(initRequest));
+        return new SearchReader(_objectServiceClient!.Search(initRequest));
+    }
+
+    public Checksum Sha256Checksum(byte[] data)
+    {
+        return new Checksum
+        {
+            Type = ChecksumType.Sha256,
+            Sum =  ByteString.CopyFrom(data.Sha256())
+        };
     }
 }
+
+

src/FrostFS.SDK.Cryptography/Base58.cs

@@ -3,8 +3,6 @@ using System.Linq;
 using System.Numerics;
 using System.Text;
 
-using Org.BouncyCastle.Security.Certificates;
-
 namespace FrostFS.SDK.Cryptography;
 
 public static class Base58

src/FrostFS.SDK.Cryptography/Helper.cs

@@ -45,7 +45,6 @@ public static class Helper
         return ByteString.CopyFrom(data.ToByteArray().Sha256());
     }
    
-   
     public static ulong Murmur64(this byte[] value, uint seed)
     {
         using var murmur = new Murmur3_128(seed);

src/FrostFS.SDK.ModelsV2/ContainerId.cs

@@ -1,30 +1,8 @@
-using System;
+namespace FrostFS.SDK.ModelsV2;
 
-using FrostFS.SDK.Cryptography;
+public class ContainerId(string id)
-
-namespace FrostFS.SDK.ModelsV2;
-
-public class ContainerId
 {
-    public string Value { get; set; }
+    public string Value { get; set; } = id;
-
-    public ContainerId(string id)
-    {
-        Value = id;
-    }
-
-    public static ContainerId FromHash(byte[] hash)
-    {
-        if (hash.Length != Constants.Sha256HashLength)
-            throw new FormatException("ContainerID must be a sha256 hash.");
-        
-        return new ContainerId(Base58.Encode(hash));
-    }
-
-    public byte[] ToHash()
-    {
-        return Base58.Decode(Value);
-    }
 
     public override string ToString()
     {

src/FrostFS.SDK.ModelsV2/Object/Object.cs

@@ -0,0 +1,65 @@
+using System.Security.Cryptography;
+using FrostFS.SDK.ModelsV2.Enums;
+
+namespace FrostFS.SDK.ModelsV2;
+
+public class Object
+{
+    public Object()
+    {
+    }
+
+    public Object(ContainerId container, byte[] payload, ObjectType objectType = ObjectType.Regular)
+    {
+        Payload = payload;
+        Header = new ObjectHeader(containerId: container, type: objectType, attributes: []);        
+    }
+
+    public ObjectHeader Header { get; set; }
+    public ObjectId ObjectId { get; set; }
+    public byte[] Payload { get; set; }
+    public Signature Signature { get; set; }   
+
+    public void SetParent(LargeObject largeObject)
+    {
+        Header.Split!.ParentHeader = largeObject.Header;
+    }
+
+    public ObjectId? GetParentId()
+    {
+        return Header.Split?.Parent;
+    }
+}
+
+public class LargeObject(ContainerId container) : Object(container, [])
+{
+    private SHA256 payloadHash = SHA256.Create();
+
+    public void AppendBlock(byte[] bytes, int count)
+    {
+        Header.PayloadLength += (ulong)count;
+        this.payloadHash.TransformBlock(bytes, 0, count, bytes, 0);
+    }
+
+    public void CalculateHash()
+    {
+        this.payloadHash.TransformFinalBlock([], 0, 0);
+        Header.PayloadCheckSum = this.payloadHash.Hash;
+    }
+
+    public ulong PayloadLength
+    {
+        get { return Header.PayloadLength; }
+    }
+}
+
+public class LinkObject : Object
+{
+    public LinkObject(ContainerId containerId, SplitId splitId, LargeObject largeObject) : base (containerId, [])
+    {
+        Header.Split = new Split(splitId)
+        {
+            ParentHeader = largeObject.Header
+        };
+    }
+}

src/FrostFS.SDK.ModelsV2/Object/ObjectAttribute.cs

@@ -0,0 +1,13 @@
+namespace FrostFS.SDK.ModelsV2;
+
+public class ObjectAttribute
+{
+    public string Key { get; set; }
+    public string Value { get; set; }
+
+    public ObjectAttribute(string key, string value)
+    {
+        Key = key;
+        Value = value;
+    }
+}

src/FrostFS.SDK.ModelsV2/Object/ObjectFilter.cs

@@ -2,18 +2,6 @@ using FrostFS.SDK.ModelsV2.Enums;
 
 namespace FrostFS.SDK.ModelsV2;
 
-public class ObjectAttribute
-{
-    public string Key { get; set; }
-    public string Value { get; set; }
-
-    public ObjectAttribute(string key, string value)
-    {
-        Key = key;
-        Value = value;
-    }
-}
-
 public class ObjectFilter
 {
     private const string HeaderPrefix = "$Object:"; 
@@ -48,30 +36,3 @@ public class ObjectFilter
         return new ObjectFilter(matchType, HeaderPrefix + "version", version.ToString());
     }
 }
-
-public class ObjectHeader
-{
-    public ObjectAttribute[] Attributes { get; set; }
-    public ContainerId ContainerId { get; set; }
-    public long Size { get; set; }
-    public ObjectType ObjectType { get; set; }
-    public Version Version { get; set; }
-
-    public ObjectHeader(
-        ContainerId containerId,
-        ObjectType type = ObjectType.Regular,
-        params ObjectAttribute[] attributes
-    )
-    {
-        Attributes = attributes;
-        ContainerId = containerId;
-        ObjectType = type;
-    }
-}
-
-public class Object
-{
-    public ObjectHeader Header { get; set; }
-    public ObjectId ObjectId { get; set; }
-    public byte[] Payload { get; set; }
-}

src/FrostFS.SDK.ModelsV2/Object/ObjectHeader.cs

@@ -0,0 +1,37 @@
+using System.Collections.Generic;
+
+using FrostFS.SDK.ModelsV2.Enums;
+
+namespace FrostFS.SDK.ModelsV2;
+
+public class ObjectHeader
+{
+    public OwnerId OwnerId { get; set; }
+
+    public List<ObjectAttribute> Attributes { get; set; }
+
+    public ContainerId ContainerId { get; set; }
+
+    public ulong PayloadLength { get; set; }
+
+    public byte[]? PayloadCheckSum { get; set; }
+
+    public ObjectType ObjectType { get; set; }
+
+    public Version Version { get; set; }
+
+    public Split? Split { get; set; }
+
+    public bool ClientCut { get; set; }
+
+    public ObjectHeader(
+        ContainerId containerId,
+        ObjectType type = ObjectType.Regular,
+        params ObjectAttribute[] attributes
+    )
+    {
+        Attributes = [.. attributes];
+        ContainerId = containerId;
+        ObjectType = type;
+    }
+}

src/FrostFS.SDK.ModelsV2/Splitter.cs

@@ -0,0 +1,88 @@
+using System;
+using System.Collections.Generic;
+
+namespace FrostFS.SDK.ModelsV2;
+
+public class Split
+{
+    public Split() : this(new SplitId())
+    {
+    }
+
+    public Split(SplitId splitId)
+    {
+        SplitId = splitId;    
+    }
+
+    public SplitId SplitId { get; private set; }
+
+    public ObjectId? Parent { get; set; }
+
+    public ObjectId? Previous { get; set; }
+    
+    public Signature? ParentSignature { get; set; }
+
+    public ObjectHeader? ParentHeader { get; set; }
+
+    public List<ObjectId> Children { get; } = [];
+}
+
+  public enum SignatureScheme {
+    EcdsaSha512,
+    EcdsaRfc6979Sha256,
+    EcdsaRfc6979Sha256WalletConnect
+  }
+
+public class Signature 
+{
+    public byte[] Key { get; set; }
+    public byte[] Sign  { get; set; }
+    public SignatureScheme Scheme { get; set; }
+}
+
+public class SplitId
+{
+    private Guid id;
+
+    public SplitId()
+    {
+        this.id = Guid.NewGuid();
+    }
+    public SplitId(Guid guid)
+    {
+        this.id = guid;
+    }
+
+    private SplitId(byte[] binary)
+    {
+        this.id = new Guid(binary);
+    }
+
+    private SplitId(string str)
+    {
+        this.id = new Guid(str);
+    }
+
+    public static SplitId CrateFromBinary(byte[] binaryData)
+    {
+        return new SplitId(binaryData);
+   }
+
+    public static SplitId CrateFromString(string stringData)
+    {
+        return new SplitId(stringData);
+ 	}
+
+    public override string ToString()
+    {
+        return this.id.ToString();
+    }
+
+    public byte[]? ToBinary()
+    {
+        if (this.id == Guid.Empty)
+            return null;
+
+        return this.id.ToByteArray();
+    }
+}

src/FrostFS.SDK.ProtosV2/object/Extension.Message.cs

@@ -115,6 +115,62 @@ namespace FrostFS.Object
         }
     }
 
+     public partial class PutSingleRequest : IRequest
+    {
+        IMetaHeader IVerificableMessage.GetMetaHeader()
+        {
+            return MetaHeader;
+        }
+
+        IVerificationHeader IVerificableMessage.GetVerificationHeader()
+        {
+            return VerifyHeader;
+        }
+
+        void IVerificableMessage.SetMetaHeader(IMetaHeader metaHeader)
+        {
+            MetaHeader = (RequestMetaHeader)metaHeader;
+        }
+
+        void IVerificableMessage.SetVerificationHeader(IVerificationHeader verificationHeader)
+        {
+            VerifyHeader = (RequestVerificationHeader)verificationHeader;
+        }
+
+        public IMessage GetBody()
+        {
+            return Body;
+        }
+    }
+
+    public partial class PutSingleResponse : IResponse
+    {
+        IMetaHeader IVerificableMessage.GetMetaHeader()
+        {
+            return MetaHeader;
+        }
+
+        IVerificationHeader IVerificableMessage.GetVerificationHeader()
+        {
+            return VerifyHeader;
+        }
+
+        void IVerificableMessage.SetMetaHeader(IMetaHeader metaHeader)
+        {
+            MetaHeader = (ResponseMetaHeader)metaHeader;
+        }
+
+        void IVerificableMessage.SetVerificationHeader(IVerificationHeader verificationHeader)
+        {
+            VerifyHeader = (ResponseVerificationHeader)verificationHeader;
+        }
+
+        public IMessage GetBody()
+        {
+            return Body;
+        }
+    }
+
     public partial class DeleteRequest : IRequest
     {
         IMetaHeader IVerificableMessage.GetMetaHeader()

src/FrostFS.SDK.ProtosV2/session/Extension.XHeader.cs

@@ -2,7 +2,7 @@
 
 public partial class XHeader
 {
-    public const string ReservedXHeaderPrefix = "__NEOFS__";
+    public const string ReservedXHeaderPrefix = "__SYSTEM__";
     public const string XHeaderNetmapEpoch = ReservedXHeaderPrefix + "NETMAP_EPOCH";
     public const string XHeaderNetmapLookupDepth = ReservedXHeaderPrefix + "NETMAP_LOOKUP_DEPTH";
 }