dlech.SshAgentLib.KeyFormatter.GetComment C# (CSharp) Метод

        public static string GetComment(IEnumerable<string> publicKeyFileLines, string defaultValue = null)
        {
            const string rfc4716BeginMarker = "---- BEGIN SSH2 PUBLIC KEY ----";
              const string rfc4716CommentHeader = "Comment: ";
              const string openSshPublicKeyStart = "ssh-";
              string comment = null;

              if (publicKeyFileLines == null)
            throw new ArgumentNullException("publicKeyFileLines");
              var firstLine = publicKeyFileLines.FirstOrDefault();
              if (firstLine != null) {
            if (firstLine == rfc4716BeginMarker) {
              var commentFound = false;
              foreach (var line in publicKeyFileLines) {
            if (commentFound) {
              comment += line;
            } else if (line.StartsWith(rfc4716CommentHeader)) {
              commentFound = true;
              comment = line.Substring(rfc4716CommentHeader.Length);
            }
            if (!commentFound)
              continue;
            if (comment.EndsWith("\\")) {
              comment = comment.Substring(0, comment.Length - 1);
              continue;
            }
              }
              if (comment == null)
            return defaultValue;
              if (comment.StartsWith("\"") && comment.EndsWith("\"")) {
            comment = comment.Substring(1, comment.Length - 2);
              }
              return comment;
            } else if (firstLine.StartsWith(openSshPublicKeyStart)) {
              var item = firstLine.Split(new char[] { ' ' }, 3);
              if (item.Length == 3)
            return item[2];
            }
              }
              return defaultValue;
        }