public static async Task<ObjectWriteResult> CreateTempFile(ObjectType type, int length, byte[] data, string rootPath) { var name = Path.Combine(rootPath, "tmp" + _random.Next(0, int.MaxValue)); using (var file = File.OpenWrite(name)) using (var stream = CompressionStream.CompressStream(file)) using (var md = new MessageDigest()) { var header = Encoding.ASCII.GetBytes(string.Format("{0} {1}\0", type.ToTypeCode(), length)); await stream.WriteAsync(header, 0, header.Length); await stream.WriteAsync(data, 0, data.Length); md.Update(header); md.Update(data); var digest = md.Digest(); return new ObjectWriteResult { FileInfo = new FileInfo(name), ObjectId = Helper.ByteArrayToId(digest) }; } }
/// <summary> /// Gets the result of a calculation that has a simple input. /// </summary> /// <param name="input">The input.</param> /// <returns></returns> public static byte[] Digest(byte[] input) { using (var me = new MessageDigest()) { me.Update(input); return me.Digest(); } }
public static string ComputeId(Blob blob) { using (var md = new MessageDigest()) { byte[] data = Encoding.Default.GetBytes(string.Format("blob {0}\0", blob.Size)); md.Update(data); md.Update(blob.Data); var digest = md.Digest(); return Helper.ByteArrayToId(digest); } }