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@c uiserver.texi                    -*- mode: texinfo; coding: latin-1; -*-
@c Specification of the UI server protocol.
@c To be included by gpgme.texi

@node UI Server Protocol
@appendix The GnuPG UI Server Protocol
@cindex UI server
@cindex user interface server


This section specifies the protocol used between clients and a User
Interface Server (UI server).  This protocol helps to build a system
where all cryptographic operations are done by a server and the server
is responsible for all dialogs.  Although @acronym{GPGME} has no direct
support for this protocol it is believed that servers will utilize the
@acronym{GPGME} library; thus having the specification included in this
manual is an appropriate choice.  This protocol should be referenced as
`The GnuPG UI Server Protocol'.

@noindent
A server needs to implement these commands:@footnote{In all examples we
assume that the connection has already been established; see the Assuan
manual for details.}

@menu
* UI Server Encrypt::                Encrypt a message.
* UI Server Sign::                   Sign a message.
* UI Server Decrypt::                Decrypt a message.
* UI Server Verify::                 Verify a message.
* UI Server Set Input Files::        Specifying the input files to operate on.
* UI Server Sign/Encrypt Files::     Encrypting and signing files.
* UI Server Verify/Decrypt Files::   Decrypting and verifying files.
* UI Server Import/Export Keys::     Managing certificates.
* UI Server Checksum Files::         Create and verify checksums for files.
* Miscellaneous UI Server Commands::   Commands not related to a specific operation.
@end menu



@node UI Server Encrypt
@section UI Server: Encrypt a Message

Before encryption can be done the recipients must be set using the
command:

@deffn Command RECIPIENT @var{string}

Set the recipient for the encryption.  @var{string} is an RFC-2822
recipient name ("mailbox" as per section 3.4).  This command may or may
not check the recipient for validity right away; if it does not all
recipients are expected to be checked at the time of the @code{ENCRYPT}
command.  All @code{RECIPIENT} commands are cumulative until a
successful @code{ENCRYPT} command or until a @code{RESET} command.
Linefeeds are obviously not allowed in @var{string} and should be folded
into spaces (which are equivalent).
@end deffn

@noindent
To tell the server the source and destination of the data, the next two
commands are to be used:

@deffn Command INPUT FD=@var{n}
Set the file descriptor for the message to be encrypted to @var{n}.  The
message send to the server is binary encoded. 

GpgOL is a Windows only program, thus @var{n} is not a libc file
descriptor but a regular system handle.  Given that the Assuan
connection works over a socket, it is not possible to use regular
inheritance to make the file descriptor available to the server.
Thus @code{DuplicateHandle} needs to be used to duplicate a handle
to the server process.  This is the reason that the server needs to
implement the @code{GETINFO pid} command.  Sending this command a second
time replaces the file descriptor set by the last one.
@c If @var{n} is not given, this commands uses the
@c %last file descriptor passed to the application.
@c %@xref{fun-assuan_sendfd, ,the assuan_sendfd function,assuan,the
@c %Libassuan manual}, on how to do descriptor passing.
@end deffn

@deffn Command OUTPUT FD=@var{n}
Set the file descriptor to be used for the output (i.e. the encrypted
message) to @var{n}.  For OpenPGP, the output needs to be ASCII armored;
for CMS, the output needs to be Base-64 encoded.  For details on the
file descriptor, see the @code{INPUT} command.
@end deffn

@noindent  
The setting of the recipients, the data source and destination may
happen in any order, even intermixed.  If this has been done the actual
encryption operation is called using:

@deffn Command ENCRYPT -@w{}-protocol=@var{name}

This command reads the plaintext from the file descriptor set by the
@code{INPUT} command, encrypts it and writes the ciphertext to the file
descriptor set by the @code{OUTPUT} command.  The server may (and
should) overlap reading and writing.  The recipients used for the
encryption are all the recipients set so far.  If any recipient is not
usable the server should take appropriate measures to notify the user
about the problem and may cancel the operation by returning an error
code.  The used file descriptors are void after this command; the
recipient list is only cleared if the server returns success.

@noindent