MimeKit.Cryptography.MultipartEncrypted.Encrypt C# (CSharp) Method

		public static MultipartEncrypted Encrypt (OpenPgpContext ctx, IEnumerable<PgpPublicKey> recipients, MimeEntity entity)
		{
			if (ctx == null)
				throw new ArgumentNullException ("ctx");

			if (recipients == null)
				throw new ArgumentNullException ("recipients");

			if (entity == null)
				throw new ArgumentNullException ("entity");

			using (var memory = new MemoryBlockStream ()) {
				using (var filtered = new FilteredStream (memory)) {
					filtered.Add (new Unix2DosFilter ());

					entity.WriteTo (filtered);
					filtered.Flush ();
				}

				memory.Position = 0;

				var encrypted = new MultipartEncrypted ();
				encrypted.ContentType.Parameters["protocol"] = ctx.EncryptionProtocol;

				// add the protocol version part
				encrypted.Add (new ApplicationPgpEncrypted ());

				// add the encrypted entity as the second part
				encrypted.Add (ctx.Encrypt (recipients, memory));

				return encrypted;
			}
		}