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|
This is gpgme.info, produced by makeinfo version 6.5 from gpgme.texi.
Copyright © 2002–2008, 2010, 2012–2018 g10 Code GmbH.
Permission is granted to copy, distribute and/or modify this
document under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 3 of the
License, or (at your option) any later version. The text of the
license can be found in the section entitled “Copying”.
This document is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
Public License for more details.
INFO-DIR-SECTION GNU Libraries
START-INFO-DIR-ENTRY
* GPGME: (gpgme). Adding support for cryptography to your program.
END-INFO-DIR-ENTRY
This file documents the GPGME library.
This is Edition 1.14.1-beta35, last updated 13 December 2019, of ‘The
‘GnuPG Made Easy’ Reference Manual’, for Version 1.14.1-beta35.
Copyright © 2002–2008, 2010, 2012–2018 g10 Code GmbH.
Permission is granted to copy, distribute and/or modify this
document under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 3 of the
License, or (at your option) any later version. The text of the
license can be found in the section entitled “Copying”.
This document is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
Public License for more details.
File: gpgme.info, Node: UI Server Decrypt, Next: UI Server Verify, Prev: UI Server Sign, Up: UI Server Protocol
A.3 UI Server: Decrypt a Message
================================
Decryption may include the verification of OpenPGP messages. This is
due to the often used combined signing/encryption modus of OpenPGP. The
client may pass an option to the server to inhibit the signature
verification. The following two commands are required to set the input
and output file descriptors:
-- Command: INPUT FD=N
Set the file descriptor for the message to be decrypted to N. The
message send to the server is either binary encoded or — in the
case of OpenPGP — ASCII armored. For details on the file
descriptor, see the description of ‘INPUT’ in the ‘ENCRYPT’
section.
-- Command: OUTPUT FD=N
Set the file descriptor to be used for the output. The output is
binary encoded. For details on the file descriptor, see the
description of ‘INPUT’ in the ‘ENCRYPT’ section.
The decryption is started with the command:
-- Command: DECRYPT --protocol=NAME [--no-verify]
[--export-session-key]
NAME is the encryption protocol used for the message. For a
description of the allowed protocols see the ‘ENCRYPT’ command.
This argument is mandatory. If the option ‘--no-verify’ is given,
the server should not try to verify a signature, in case the input
data is an OpenPGP combined message. If the option
‘--export-session-key’ is given and the underlying engine knows how
to export the session key, it will appear on a status line
File: gpgme.info, Node: UI Server Verify, Next: UI Server Set Input Files, Prev: UI Server Decrypt, Up: UI Server Protocol
A.4 UI Server: Verify a Message
===============================
The server needs to support the verification of opaque signatures as
well as detached signatures. The kind of input sources controls what
kind message is to be verified.
-- Command: MESSAGE FD=N
This command is used with detached signatures to set the file
descriptor for the signed data to N. The data is binary encoded
(used verbatim). For details on the file descriptor, see the
description of ‘INPUT’ in the ‘ENCRYPT’ section.
-- Command: INPUT FD=N
Set the file descriptor for the opaque message or the signature
part of a detached signature to N. The message send to the server
is either binary encoded or – in the case of OpenPGP – ASCII
armored. For details on the file descriptor, see the description
of ‘INPUT’ in the ‘ENCRYPT’ section.
-- Command: OUTPUT FD=N
Set the file descriptor to be used for the output. The output is
binary encoded and only used for opaque signatures. For details on
the file descriptor, see the description of ‘INPUT’ in the
‘ENCRYPT’ section.
The verification is then started using:
-- Command: VERIFY --protocol=NAME [--silent]
NAME is the signing protocol used for the message. For a
description of the allowed protocols see the ‘ENCRYPT’ command.
This argument is mandatory. Depending on the combination of
‘MESSAGE’ ‘INPUT’ and ‘OUTPUT’ commands, the server needs to select
the appropriate verification mode:
MESSAGE and INPUT
This indicates a detached signature. Output data is not
applicable.
INPUT
This indicates an opaque signature. As no output command has
been given, the server is only required to check the
signature.
INPUT and OUTPUT
This indicates an opaque signature. The server shall write
the signed data to the file descriptor set by the output
command. This data shall even be written if the signatures
can’t be verified.
With ‘--silent’ the server shall not display any dialog; this is for
example used by the client to get the content of opaque signed messages.
The client expects the server to send at least this status information
before the final OK response:
-- Status line: SIGSTATUS FLAG DISPLAYSTRING
Returns the status for the signature and a short string explaining
the status. Valid values for FLAG are:
‘none’
The message has a signature but it could not not be verified
due to a missing key.
‘green’
The signature is fully valid.
‘yellow’
The signature is valid but additional information was shown
regarding the validity of the key.
‘red’
The signature is not valid.
DISPLAYSTRING is a percent-and-plus-encoded string with a short
human readable description of the status. For example
S SIGSTATUS green Good+signature+from+Keith+Moon+<keith@example.net>
Note that this string needs to fit into an Assuan line and should
be short enough to be displayed as short one-liner on the clients
window. As usual the encoding of this string is UTF-8 and it
should be send in its translated form.
The server shall send one status line for every signature found on
the message.
File: gpgme.info, Node: UI Server Set Input Files, Next: UI Server Sign/Encrypt Files, Prev: UI Server Verify, Up: UI Server Protocol
A.5 UI Server: Specifying the input files to operate on.
========================================================
All file related UI server commands operate on a number of input files
or directories, specified by one or more ‘FILE’ commands:
-- Command: FILE [--clear] NAME
Add the file or directory NAME to the list of pathnames to be
processed by the server. The parameter NAME must be an absolute
path name (including the drive letter) and is percent espaced (in
particular, the characters %, = and white space characters are
always escaped). If the option ‘--clear’ is given, the list of
files is cleared before adding NAME.
Historical note: The original spec did not define ‘--clear’ but the
keyword ‘--continued’ after the file name to indicate that more
files are to be expected. However, this has never been used and
thus removed from the specs.
File: gpgme.info, Node: UI Server Sign/Encrypt Files, Next: UI Server Verify/Decrypt Files, Prev: UI Server Set Input Files, Up: UI Server Protocol
A.6 UI Server: Encrypting and signing files.
============================================
First, the input files need to be specified by one or more ‘FILE’
commands. Afterwards, the actual operation is requested:
-- Command: ENCRYPT_FILES --nohup
-- Command: SIGN_FILES --nohup
-- Command: ENCRYPT_SIGN_FILES --nohup
Request that the files specified by ‘FILE’ are encrypted and/or
signed. The command selects the default action. The UI server may
allow the user to change this default afterwards interactively, and
even abort the operation or complete it only on some of the
selected files and directories.
What it means to encrypt or sign a file or directory is specific to
the preferences of the user, the functionality the UI server
provides, and the selected protocol. Typically, for each input
file a new file is created under the original filename plus a
protocol specific extension (like ‘.gpg’ or ‘.sig’), which contain
the encrypted/signed file or a detached signature. For
directories, the server may offer multiple options to the user (for
example ignore or process recursively).
The ‘ENCRYPT_SIGN_FILES’ command requests a combined sign and
encrypt operation. It may not be available for all protocols (for
example, it is available for OpenPGP but not for CMS).
The option ‘--nohup’ is mandatory. It is currently unspecified
what should happen if ‘--nohup’ is not present. Because ‘--nohup’
is present, the server always returns ‘OK’ promptly, and completes
the operation asynchronously.
File: gpgme.info, Node: UI Server Verify/Decrypt Files, Next: UI Server Import/Export Keys, Prev: UI Server Sign/Encrypt Files, Up: UI Server Protocol
A.7 UI Server: Decrypting and verifying files.
==============================================
First, the input files need to be specified by one or more ‘FILE’
commands. Afterwards, the actual operation is requested:
-- Command: DECRYPT_FILES --nohup
-- Command: VERIFY_FILES --nohup
-- Command: DECRYPT_VERIFY_FILES --nohup
Request that the files specified by ‘FILE’ are decrypted and/or
verified. The command selects the default action. The UI server
may allow the user to change this default afterwards interactively,
and even abort the operation or complete it only on some of the
selected files and directories.
What it means to decrypt or verify a file or directory is specific
to the preferences of the user, the functionality the UI server
provides, and the selected protocol. Typically, for decryption, a
new file is created for each input file under the original filename
minus a protocol specific extension (like ‘.gpg’) which contains
the original plaintext. For verification a status is displayed for
each signed input file, indicating if it is signed, and if yes, if
the signature is valid. For files that are signed and encrypted,
the ‘VERIFY’ command transiently decrypts the file to verify the
enclosed signature. For directories, the server may offer multiple
options to the user (for example ignore or process recursively).
The option ‘--nohup’ is mandatory. It is currently unspecified
what should happen if ‘--nohup’ is not present. Because ‘--nohup’
is present, the server always returns ‘OK’ promptly, and completes
the operation asynchronously.
File: gpgme.info, Node: UI Server Import/Export Keys, Next: UI Server Checksum Files, Prev: UI Server Verify/Decrypt Files, Up: UI Server Protocol
A.8 UI Server: Managing certificates.
=====================================
First, the input files need to be specified by one or more ‘FILE’
commands. Afterwards, the actual operation is requested:
-- Command: IMPORT_FILES --nohup
Request that the certificates contained in the files specified by
‘FILE’ are imported into the local certificate databases.
For directories, the server may offer multiple options to the user
(for example ignore or process recursively).
The option ‘--nohup’ is mandatory. It is currently unspecified
what should happen if ‘--nohup’ is not present. Because ‘--nohup’
is present, the server always returns ‘OK’ promptly, and completes
the operation asynchronously.
FIXME: It may be nice to support an ‘EXPORT’ command as well, which
is enabled by the context menu of the background of a directory.
File: gpgme.info, Node: UI Server Checksum Files, Next: Miscellaneous UI Server Commands, Prev: UI Server Import/Export Keys, Up: UI Server Protocol
A.9 UI Server: Create and verify checksums for files.
=====================================================
First, the input files need to be specified by one or more ‘FILE’
commands. Afterwards, the actual operation is requested:
-- Command: CHECKSUM_CREATE_FILES --nohup
Request that checksums are created for the files specified by
‘FILE’. The choice of checksum algorithm and the destination
storage and format for the created checksums depend on the
preferences of the user and the functionality provided by the UI
server. For directories, the server may offer multiple options to
the user (for example ignore or process recursively).
The option ‘--nohup’ is mandatory. It is currently unspecified
what should happen if ‘--nohup’ is not present. Because ‘--nohup’
is present, the server always returns ‘OK’ promptly, and completes
the operation asynchronously.
-- Command: CHECKSUM_VERIFY_FILES --nohup
Request that checksums are created for the files specified by
‘FILE’ and verified against previously created and stored
checksums. The choice of checksum algorithm and the source storage
and format for previously created checksums depend on the
preferences of the user and the functionality provided by the UI
server. For directories, the server may offer multiple options to
the user (for example ignore or process recursively).
If the source storage of previously created checksums is available
to the user through the Windows shell, this command may also accept
such checksum files as ‘FILE’ arguments. In this case, the UI
server should instead verify the checksum of the referenced files
as if they were given as INPUT files.
The option ‘--nohup’ is mandatory. It is currently unspecified
what should happen if ‘--nohup’ is not present. Because ‘--nohup’
is present, the server always returns ‘OK’ promptly, and completes
the operation asynchronously.
File: gpgme.info, Node: Miscellaneous UI Server Commands, Prev: UI Server Checksum Files, Up: UI Server Protocol
A.10 Miscellaneous UI Server Commands
=====================================
The server needs to implement the following commands which are not
related to a specific command:
-- Command: GETINFO WHAT
This is a multi purpose command, commonly used to return a variety
of information. The required subcommands as described by the WHAT
parameter are:
‘pid’
Return the process id of the server in decimal notation using
an Assuan data line.
To allow the server to pop up the windows in the correct relation to the
client, the client is advised to tell the server by sending the option:
-- Command option: window-id NUMBER
The NUMBER represents the native window ID of the clients current
window. On Windows systems this is a windows handle (‘HWND’) and
on X11 systems it is the ‘X Window ID’. The number needs to be
given as a hexadecimal value so that it is easier to convey pointer
values (e.g. ‘HWND’).
A client may want to fire up the certificate manager of the server. To
do this it uses the Assuan command:
-- Command: START_KEYMANAGER
The server shall pop up the main window of the key manager (aka
certificate manager). The client expects that the key manager is
brought into the foregound and that this command immediately
returns (does not wait until the key manager has been fully brought
up).
A client may want to fire up the configuration dialog of the server. To
do this it uses the Assuan command:
-- Command: START_CONFDIALOG
The server shall pop up its configuration dialog. The client
expects that this dialog is brought into the foregound and that
this command immediately returns (i.e. it does not wait until the
dialog has been fully brought up).
When doing an operation on a mail, it is useful to let the server know
the address of the sender:
-- Command: SENDER [--info] [--protocol=NAME] EMAIL
EMAIL is the plain ASCII encoded address ("addr-spec" as per
RFC-2822) enclosed in angle brackets. The address set with this
command is valid until a successful completion of the operation or
until a ‘RESET’ command. A second command overrides the effect of
the first one; if EMAIL is not given and ‘--info’ is not used, the
server shall use the default signing key.
If option ‘--info’ is not given, the server shall also suggest a
protocol to use for signing. The client may use this suggested
protocol on its own discretion. The same status line as with
PREP_ENCRYPT is used for this.
The option ‘--protocol’ may be used to give the server a hint on
which signing protocol should be preferred.
To allow the UI-server to visually identify a running operation or to
associate operations the server MAY support the command:
-- Command: SESSION NUMBER [STRING]
The NUMBER is an arbitrary value, a server may use to associate
simultaneous running sessions. It is a 32 bit unsigned integer
with ‘0’ as a special value indicating that no session association
shall be done.
If STRING is given, the server may use this as the title of a
window or, in the case of an email operation, to extract the
sender’s address. The string may contain spaces; thus no
plus-escaping is used.
This command may be used at any time and overrides the effect of
the last command. A ‘RESET’ undoes the effect of this command.
File: gpgme.info, Node: Debugging, Next: Deprecated Functions, Prev: UI Server Protocol, Up: Top
Appendix B How to solve problems
********************************
Everyone knows that software often does not do what it should do and
thus there is a need to track down problems. This is in particular true
for applications using a complex library like GPGME and of course also
for the library itself. Here we give a few hints on how to solve such
problems.
First of all you should make sure that the keys you want to use are
installed in the GnuPG engine and are usable. Thus the first test is to
run the desired operation using ‘gpg’ or ‘gpgsm’ on the command line.
If you can’t figure out why things don’t work, you may use GPGME’s built
in trace feature. This feature is either enabled using the environment
variable ‘GPGME_DEBUG’ or, if this is not possible, by calling the
function ‘gpgme_set_global_flag’. The value is the trace level and an
optional file name. If no file name is given the trace output is
printed to ‘stderr’.
For example
GPGME_DEBUG=9:/home/user/mygpgme.log
(Note that under Windows you use a semicolon in place of the colon to
separate the fields.)
A trace level of 9 is pretty verbose and thus you may want to start
off with a lower level. The exact definition of the trace levels and
the output format may change with any release; you need to check the
source code for details. In any case the trace log should be helpful to
understand what is going going on. Warning: The trace log may reveal
sensitive details like passphrases or other data you use in your
application. If you are asked to send a log file, make sure that you
run your tests only with play data.
File: gpgme.info, Node: Deprecated Functions, Next: Library Copying, Prev: Debugging, Up: Top
Appendix C Deprecated Functions
*******************************
For backward compatibility GPGME has a number of functions, data types
and constants which are deprecated and should not be used anymore. We
document here those which are really old to help understanding old code
and to allow migration to their modern counterparts.
*Warning:* These interfaces will be removed in a future version of
GPGME.
-- Function: void gpgme_key_release (gpgme_key_t KEY)
The function ‘gpgme_key_release’ is equivalent to
‘gpgme_key_unref’.
-- Function: gpgme_error_t gpgme_op_import_ext (gpgme_ctx_t CTX,
gpgme_data_t KEYDATA, int *NR)
SINCE: 0.3.9
The function ‘gpgme_op_import_ext’ is equivalent to:
gpgme_error_t err = gpgme_op_import (ctx, keydata);
if (!err)
{
gpgme_import_result_t result = gpgme_op_import_result (ctx);
*nr = result->considered;
}
-- Data type: gpgme_error_t (*gpgme_edit_cb_t) (void *HANDLE,
gpgme_status_code_t STATUS, const char *ARGS, int FD)
The ‘gpgme_edit_cb_t’ type is the type of functions which GPGME
calls if it a key edit operation is on-going. The status code
STATUS and the argument line ARGS are passed through by GPGME from
the crypto engine. The file descriptor FD is -1 for normal status
messages. If STATUS indicates a command rather than a status
message, the response to the command should be written to FD. The
HANDLE is provided by the user at start of operation.
The function should return ‘GPG_ERR_FALSE’ if it did not handle the
status code, ‘0’ for success, or any other error value.
-- Function: gpgme_error_t gpgme_op_edit (gpgme_ctx_t CTX,
gpgme_key_t KEY, gpgme_edit_cb_t FNC, void *HANDLE,
gpgme_data_t OUT)
SINCE: 0.3.9
Note: This function is deprecated, please use ‘gpgme_op_interact’
instead.
The function ‘gpgme_op_edit’ processes the key KEY interactively,
using the edit callback function FNC with the handle HANDLE. The
callback is invoked for every status and command request from the
crypto engine. The output of the crypto engine is written to the
data object OUT.
Note that the protocol between the callback function and the crypto
engine is specific to the crypto engine and no further support in
implementing this protocol correctly is provided by GPGME.
The function returns the error code ‘GPG_ERR_NO_ERROR’ if the edit
operation completes successfully, ‘GPG_ERR_INV_VALUE’ if CTX or KEY
is not a valid pointer, and any error returned by the crypto engine
or the edit callback handler.
-- Function: gpgme_error_t gpgme_op_edit_start (gpgme_ctx_t CTX,
gpgme_key_t KEY, gpgme_edit_cb_t FNC, void *HANDLE,
gpgme_data_t OUT)
SINCE: 0.3.9
Note: This function is deprecated, please use
‘gpgme_op_interact_start’ instead.
The function ‘gpgme_op_edit_start’ initiates a ‘gpgme_op_edit’
operation. It can be completed by calling ‘gpgme_wait’ on the
context. *Note Waiting For Completion::.
The function returns the error code ‘GPG_ERR_NO_ERROR’ if the
operation was started successfully, and ‘GPG_ERR_INV_VALUE’ if CTX
or KEY is not a valid pointer.
-- Function: gpgme_error_t gpgme_op_card_edit (gpgme_ctx_t CTX,
gpgme_key_t KEY, gpgme_edit_cb_t FNC, void *HANDLE,
gpgme_data_t OUT)
Note: This function is deprecated, please use ‘gpgme_op_interact’
with the flag ‘GPGME_INTERACT_CARD’ instead.
The function ‘gpgme_op_card_edit’ is analogous to ‘gpgme_op_edit’,
but should be used to process the smart card corresponding to the
key KEY.
-- Function: gpgme_error_t gpgme_op_card_edit_start (gpgme_ctx_t CTX,
gpgme_key_t KEY, gpgme_edit_cb_t FNC, void *HANDLE,
gpgme_data_t OUT)
Note: This function is deprecated, please use
‘gpgme_op_interact_start’ with the flag ‘GPGME_INTERACT_CARD’
instead.
The function ‘gpgme_op_card_edit_start’ initiates a
‘gpgme_op_card_edit’ operation. It can be completed by calling
‘gpgme_wait’ on the context. *Note Waiting For Completion::.
The function returns the error code ‘GPG_ERR_NO_ERROR’ if the
operation was started successfully, and ‘GPG_ERR_INV_VALUE’ if CTX
or KEY is not a valid pointer.
-- Function: gpgme_error_t gpgme_data_new_with_read_cb
(gpgme_data_t *DH, int (*READFUNC) (void *HOOK, char *BUFFER,
size_t COUNT, size_t *NREAD), void *HOOK_VALUE)
The function ‘gpgme_data_new_with_read_cb’ creates a new
‘gpgme_data_t’ object and uses the callback function READFUNC to
retrieve the data on demand. As the callback function can supply
the data in any way it wants, this is the most flexible data type
GPGME provides. However, it can not be used to write data.
The callback function receives HOOK_VALUE as its first argument
whenever it is invoked. It should return up to COUNT bytes in
BUFFER, and return the number of bytes actually read in NREAD. It
may return ‘0’ in NREAD if no data is currently available. To
indicate ‘EOF’ the function should return with an error code of
‘-1’ and set NREAD to ‘0’. The callback function may support to
reset its internal read pointer if it is invoked with BUFFER and
NREAD being ‘NULL’ and COUNT being ‘0’.
The function returns the error code ‘GPG_ERR_NO_ERROR’ if the data
object was successfully created, ‘GPG_ERR_INV_VALUE’ if DH or
READFUNC is not a valid pointer, and ‘GPG_ERR_ENOMEM’ if not enough
memory is available.
-- Function: gpgme_error_t gpgme_data_rewind (gpgme_data_t DH)
The function ‘gpgme_data_rewind’ is equivalent to:
return (gpgme_data_seek (dh, 0, SEEK_SET) == -1)
? gpgme_error_from_errno (errno) : 0;
-- Data type: gpgme_attr_t
The ‘gpgme_attr_t’ type is used to specify a key or trust item
attribute. The following attributes are defined:
‘GPGME_ATTR_KEYID’
This is the key ID of a sub key. It is representable as a
string.
‘GPGME_ATTR_FPR’
This is the fingerprint of a sub key. It is representable as
a string.
‘GPGME_ATTR_ALGO’
This is the crypto algorithm for which the sub key can be
used. It is representable as a string and as a number. The
numbers correspond to the ‘enum gcry_pk_algos’ values in the
gcrypt library.
‘GPGME_ATTR_LEN’
This is the key length of a sub key. It is representable as a
number.
‘GPGME_ATTR_CREATED’
This is the timestamp at creation time of a sub key. It is
representable as a number.
‘GPGME_ATTR_EXPIRE’
This is the expiration time of a sub key. It is representable
as a number.
‘GPGME_ATTR_USERID’
This is a user ID. There can be more than one user IDs in a
GPGME_KEY_T object. The first one (with index 0) is the
primary user ID. The user ID is representable as a number.
‘GPGME_ATTR_NAME’
This is the name belonging to a user ID. It is representable
as a string.
‘GPGME_ATTR_EMAIL’
This is the email address belonging to a user ID. It is
representable as a string.
‘GPGME_ATTR_COMMENT’
This is the comment belonging to a user ID. It is
representable as a string.
‘GPGME_ATTR_VALIDITY’
This is the validity belonging to a user ID. It is
representable as a string and as a number. See below for a
list of available validities.
‘GPGME_ATTR_UID_REVOKED’
This specifies if a user ID is revoked. It is representable
as a number, and is ‘1’ if the user ID is revoked, and ‘0’
otherwise.
‘GPGME_ATTR_UID_INVALID’
This specifies if a user ID is invalid. It is representable
as a number, and is ‘1’ if the user ID is invalid, and ‘0’
otherwise.
‘GPGME_ATTR_TYPE’
This returns information about the type of key. For the
string function this will eother be "PGP" or "X.509". The
integer function returns 0 for PGP and 1 for X.509.
‘GPGME_ATTR_IS_SECRET’
This specifies if the key is a secret key. It is
representable as a number, and is ‘1’ if the key is revoked,
and ‘0’ otherwise.
‘GPGME_ATTR_KEY_REVOKED’
This specifies if a sub key is revoked. It is representable
as a number, and is ‘1’ if the key is revoked, and ‘0’
otherwise.
‘GPGME_ATTR_KEY_INVALID’
This specifies if a sub key is invalid. It is representable
as a number, and is ‘1’ if the key is invalid, and ‘0’
otherwise.
‘GPGME_ATTR_KEY_EXPIRED’
This specifies if a sub key is expired. It is representable
as a number, and is ‘1’ if the key is expired, and ‘0’
otherwise.
‘GPGME_ATTR_KEY_DISABLED’
This specifies if a sub key is disabled. It is representable
as a number, and is ‘1’ if the key is disabled, and ‘0’
otherwise.
‘GPGME_ATTR_KEY_CAPS’
This is a description of the capabilities of a sub key. It is
representable as a string. The string contains the letter “e”
if the key can be used for encryption, “s” if the key can be
used for signatures, and “c” if the key can be used for
certifications.
‘GPGME_ATTR_CAN_ENCRYPT’
This specifies if a sub key can be used for encryption. It is
representable as a number, and is ‘1’ if the sub key can be
used for encryption, and ‘0’ otherwise.
‘GPGME_ATTR_CAN_SIGN’
This specifies if a sub key can be used to create data
signatures. It is representable as a number, and is ‘1’ if
the sub key can be used for signatures, and ‘0’ otherwise.
‘GPGME_ATTR_CAN_CERTIFY’
This specifies if a sub key can be used to create key
certificates. It is representable as a number, and is ‘1’ if
the sub key can be used for certifications, and ‘0’ otherwise.
‘GPGME_ATTR_SERIAL’
The X.509 issuer serial attribute of the key. It is
representable as a string.
‘GPGME_ATTR_ISSUE’
The X.509 issuer name attribute of the key. It is
representable as a string.
‘GPGME_ATTR_CHAINID’
The X.509 chain ID can be used to build the certification
chain. It is representable as a string.
-- Function: const char * gpgme_key_get_string_attr (gpgme_key_t KEY,
gpgme_attr_t WHAT, const void *RESERVED, int IDX)
The function ‘gpgme_key_get_string_attr’ returns the value of the
string-representable attribute WHAT of key KEY. If the attribute
is an attribute of a sub key or an user ID, IDX specifies the sub
key or user ID of which the attribute value is returned. The
argument RESERVED is reserved for later use and should be ‘NULL’.
The string returned is only valid as long as the key is valid.
The function returns ‘0’ if an attribute can’t be returned as a
string, KEY is not a valid pointer, IDX out of range, or RESERVED
not ‘NULL’.
-- Function: unsigned long gpgme_key_get_ulong_attr (gpgme_key_t KEY,
gpgme_attr_t WHAT, const void *RESERVED, int IDX)
The function ‘gpgme_key_get_ulong_attr’ returns the value of the
number-representable attribute WHAT of key KEY. If the attribute
is an attribute of a sub key or an user ID, IDX specifies the sub
key or user ID of which the attribute value is returned. The
argument RESERVED is reserved for later use and should be ‘NULL’.
The function returns ‘0’ if the attribute can’t be returned as a
number, KEY is not a valid pointer, IDX out of range, or RESERVED
not ‘NULL’.
The signatures on a key are only available if the key was retrieved
via a listing operation with the ‘GPGME_KEYLIST_MODE_SIGS’ mode enabled,
because it is expensive to retrieve all signatures of a key.
So, before using the below interfaces to retrieve the signatures on a
key, you have to make sure that the key was listed with signatures
enabled. One convenient, but blocking, way to do this is to use the
function ‘gpgme_get_key’.
-- Data type: gpgme_attr_t
The ‘gpgme_attr_t’ type is used to specify a key signature
attribute. The following attributes are defined:
‘GPGME_ATTR_KEYID’
This is the key ID of the key which was used for the
signature. It is representable as a string.
‘GPGME_ATTR_ALGO’
This is the crypto algorithm used to create the signature. It
is representable as a string and as a number. The numbers
correspond to the ‘enum gcry_pk_algos’ values in the gcrypt
library.
‘GPGME_ATTR_CREATED’
This is the timestamp at creation time of the signature. It
is representable as a number.
‘GPGME_ATTR_EXPIRE’
This is the expiration time of the signature. It is
representable as a number.
‘GPGME_ATTR_USERID’
This is the user ID associated with the signing key. The user
ID is representable as a number.
‘GPGME_ATTR_NAME’
This is the name belonging to a user ID. It is representable
as a string.
‘GPGME_ATTR_EMAIL’
This is the email address belonging to a user ID. It is
representable as a string.
‘GPGME_ATTR_COMMENT’
This is the comment belonging to a user ID. It is
representable as a string.
‘GPGME_ATTR_KEY_REVOKED’
This specifies if a key signature is a revocation signature.
It is representable as a number, and is ‘1’ if the key is
revoked, and ‘0’ otherwise.
‘GPGME_ATTR_SIG_CLASS’
This specifies the signature class of a key signature. It is
representable as a number. The meaning is specific to the
crypto engine.
‘GPGME_ATTR_SIG_CLASS’
This specifies the signature class of a key signature. It is
representable as a number. The meaning is specific to the
crypto engine.
‘GPGME_ATTR_SIG_STATUS’
This is the same value as returned by ‘gpgme_get_sig_status’.
-- Function: const char * gpgme_key_sig_get_string_attr
(gpgme_key_t KEY, int UID_IDX, gpgme_attr_t WHAT,
const void *RESERVED, int IDX)
The function ‘gpgme_key_sig_get_string_attr’ returns the value of
the string-representable attribute WHAT of the signature IDX on the
user ID UID_IDX in the key KEY. The argument RESERVED is reserved
for later use and should be ‘NULL’.
The string returned is only valid as long as the key is valid.
The function returns ‘0’ if an attribute can’t be returned as a
string, KEY is not a valid pointer, UID_IDX or IDX out of range, or
RESERVED not ‘NULL’.
-- Function: unsigned long gpgme_key_sig_get_ulong_attr
(gpgme_key_t KEY, int UID_IDX, gpgme_attr_t WHAT,
const void *RESERVED, int IDX)
The function ‘gpgme_key_sig_get_ulong_attr’ returns the value of
the number-representable attribute WHAT of the signature IDX on the
user ID UID_IDX in the key KEY. The argument RESERVED is reserved
for later use and should be ‘NULL’.
The function returns ‘0’ if an attribute can’t be returned as a
string, KEY is not a valid pointer, UID_IDX or IDX out of range, or
RESERVED not ‘NULL’.
-- Data type: enum gpgme_sig_stat_t
The ‘gpgme_sig_stat_t’ type holds the result of a signature check,
or the combined result of all signatures. The following results
are possible:
‘GPGME_SIG_STAT_NONE’
This status should not occur in normal operation.
‘GPGME_SIG_STAT_GOOD’
This status indicates that the signature is valid. For the
combined result this status means that all signatures are
valid.
‘GPGME_SIG_STAT_GOOD_EXP’
This status indicates that the signature is valid but expired.
For the combined result this status means that all signatures
are valid and expired.
‘GPGME_SIG_STAT_GOOD_EXPKEY’
This status indicates that the signature is valid but the key
used to verify the signature has expired. For the combined
result this status means that all signatures are valid and all
keys are expired.
‘GPGME_SIG_STAT_BAD’
This status indicates that the signature is invalid. For the
combined result this status means that all signatures are
invalid.
‘GPGME_SIG_STAT_NOKEY’
This status indicates that the signature could not be verified
due to a missing key. For the combined result this status
means that all signatures could not be checked due to missing
keys.
‘GPGME_SIG_STAT_NOSIG’
This status indicates that the signature data provided was not
a real signature.
‘GPGME_SIG_STAT_ERROR’
This status indicates that there was some other error which
prevented the signature verification.
‘GPGME_SIG_STAT_DIFF’
For the combined result this status means that at least two
signatures have a different status. You can get each key’s
status with ‘gpgme_get_sig_status’.
-- Function: const char * gpgme_get_sig_status (gpgme_ctx_t CTX,
int IDX, gpgme_sig_stat_t *R_STAT, time_t *R_CREATED)
The function ‘gpgme_get_sig_status’ is equivalent to:
gpgme_verify_result_t result;
gpgme_signature_t sig;
result = gpgme_op_verify_result (ctx);
sig = result->signatures;
while (sig && idx)
{
sig = sig->next;
idx--;
}
if (!sig || idx)
return NULL;
if (r_stat)
{
switch (gpg_err_code (sig->status))
{
case GPG_ERR_NO_ERROR:
*r_stat = GPGME_SIG_STAT_GOOD;
break;
case GPG_ERR_BAD_SIGNATURE:
*r_stat = GPGME_SIG_STAT_BAD;
break;
case GPG_ERR_NO_PUBKEY:
*r_stat = GPGME_SIG_STAT_NOKEY;
break;
case GPG_ERR_NO_DATA:
*r_stat = GPGME_SIG_STAT_NOSIG;
break;
case GPG_ERR_SIG_EXPIRED:
*r_stat = GPGME_SIG_STAT_GOOD_EXP;
break;
case GPG_ERR_KEY_EXPIRED:
*r_stat = GPGME_SIG_STAT_GOOD_EXPKEY;
break;
default:
*r_stat = GPGME_SIG_STAT_ERROR;
break;
}
}
if (r_created)
*r_created = sig->timestamp;
return sig->fpr;
-- Function: const char * gpgme_get_sig_string_attr (gpgme_ctx_t CTX,
int IDX, gpgme_attr_t WHAT, int WHATIDX)
The function ‘gpgme_get_sig_string_attr’ is equivalent to:
gpgme_verify_result_t result;
gpgme_signature_t sig;
result = gpgme_op_verify_result (ctx);
sig = result->signatures;
while (sig && idx)
{
sig = sig->next;
idx--;
}
if (!sig || idx)
return NULL;
switch (what)
{
case GPGME_ATTR_FPR:
return sig->fpr;
case GPGME_ATTR_ERRTOK:
if (whatidx == 1)
return sig->wrong_key_usage ? "Wrong_Key_Usage" : "";
else
return "";
default:
break;
}
return NULL;
-- Function: const char * gpgme_get_sig_ulong_attr (gpgme_ctx_t CTX,
int IDX, gpgme_attr_t WHAT, int WHATIDX)
The function ‘gpgme_get_sig_ulong_attr’ is equivalent to:
gpgme_verify_result_t result;
gpgme_signature_t sig;
result = gpgme_op_verify_result (ctx);
sig = result->signatures;
while (sig && idx)
{
sig = sig->next;
idx--;
}
if (!sig || idx)
return 0;
switch (what)
{
case GPGME_ATTR_CREATED:
return sig->timestamp;
case GPGME_ATTR_EXPIRE:
return sig->exp_timestamp;
case GPGME_ATTR_VALIDITY:
return (unsigned long) sig->validity;
case GPGME_ATTR_SIG_STATUS:
switch (sig->status)
{
case GPG_ERR_NO_ERROR:
return GPGME_SIG_STAT_GOOD;
case GPG_ERR_BAD_SIGNATURE:
return GPGME_SIG_STAT_BAD;
case GPG_ERR_NO_PUBKEY:
return GPGME_SIG_STAT_NOKEY;
case GPG_ERR_NO_DATA:
return GPGME_SIG_STAT_NOSIG;
case GPG_ERR_SIG_EXPIRED:
return GPGME_SIG_STAT_GOOD_EXP;
case GPG_ERR_KEY_EXPIRED:
return GPGME_SIG_STAT_GOOD_EXPKEY;
default:
return GPGME_SIG_STAT_ERROR;
}
case GPGME_ATTR_SIG_SUMMARY:
return sig->summary;
default:
break;
}
return 0;
-- Function: const char * gpgme_get_sig_key (gpgme_ctx_t CTX, int IDX,
gpgme_key_t *R_KEY)
The function ‘gpgme_get_sig_key’ is equivalent to:
gpgme_verify_result_t result;
gpgme_signature_t sig;
result = gpgme_op_verify_result (ctx);
sig = result->signatures;
while (sig && idx)
{
sig = sig->next;
idx--;
}
if (!sig || idx)
return gpg_error (GPG_ERR_EOF);
return gpgme_get_key (ctx, sig->fpr, r_key, 0);
File: gpgme.info, Node: Library Copying, Next: Copying, Prev: Deprecated Functions, Up: Top
GNU Lesser General Public License
*********************************
Version 2.1, February 1999
Copyright © 1991, 1999 Free Software Foundation, Inc.
59 Temple Place – Suite 330, Boston, MA 02111-1307, USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
[This is the first released version of the Lesser GPL. It also counts
as the successor of the GNU Library Public License, version 2, hence the
version number 2.1.]
Preamble
========
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How to Apply These Terms to Your New Libraries
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That’s all there is to it!
File: gpgme.info, Node: Copying, Next: Concept Index, Prev: Library Copying, Up: Top
GNU General Public License
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Version 3, 29 June 2007
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Preamble
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or requiring that modified versions of such material be marked
in reasonable ways as different from the original version; or
d. Limiting the use for publicity purposes of names of licensors
or authors of the material; or
e. Declining to grant rights under trademark law for use of some
trade names, trademarks, or service marks; or
f. Requiring indemnification of licensors and authors of that
material by anyone who conveys the material (or modified
versions of it) with contractual assumptions of liability to
the recipient, for any liability that these contractual
assumptions directly impose on those licensors and authors.
All other non-permissive additional terms are considered “further
restrictions” within the meaning of section 10. If the Program as
you received it, or any part of it, contains a notice stating that
it is governed by this License along with a term that is a further
restriction, you may remove that term. If a license document
contains a further restriction but permits relicensing or conveying
under this License, you may add to a covered work material governed
by the terms of that license document, provided that the further
restriction does not survive such relicensing or conveying.
If you add terms to a covered work in accord with this section, you
must place, in the relevant source files, a statement of the
additional terms that apply to those files, or a notice indicating
where to find the applicable terms.
Additional terms, permissive or non-permissive, may be stated in
the form of a separately written license, or stated as exceptions;
the above requirements apply either way.
8. Termination.
You may not propagate or modify a covered work except as expressly
provided under this License. Any attempt otherwise to propagate or
modify it is void, and will automatically terminate your rights
under this License (including any patent licenses granted under the
third paragraph of section 11).
However, if you cease all violation of this License, then your
license from a particular copyright holder is reinstated (a)
provisionally, unless and until the copyright holder explicitly and
finally terminates your license, and (b) permanently, if the
copyright holder fails to notify you of the violation by some
reasonable means prior to 60 days after the cessation.
Moreover, your license from a particular copyright holder is
reinstated permanently if the copyright holder notifies you of the
violation by some reasonable means, this is the first time you have
received notice of violation of this License (for any work) from
that copyright holder, and you cure the violation prior to 30 days
after your receipt of the notice.
Termination of your rights under this section does not terminate
the licenses of parties who have received copies or rights from you
under this License. If your rights have been terminated and not
permanently reinstated, you do not qualify to receive new licenses
for the same material under section 10.
9. Acceptance Not Required for Having Copies.
You are not required to accept this License in order to receive or
run a copy of the Program. Ancillary propagation of a covered work
occurring solely as a consequence of using peer-to-peer
transmission to receive a copy likewise does not require
acceptance. However, nothing other than this License grants you
permission to propagate or modify any covered work. These actions
infringe copyright if you do not accept this License. Therefore,
by modifying or propagating a covered work, you indicate your
acceptance of this License to do so.
10. Automatic Licensing of Downstream Recipients.
Each time you convey a covered work, the recipient automatically
receives a license from the original licensors, to run, modify and
propagate that work, subject to this License. You are not
responsible for enforcing compliance by third parties with this
License.
An “entity transaction” is a transaction transferring control of an
organization, or substantially all assets of one, or subdividing an
organization, or merging organizations. If propagation of a
covered work results from an entity transaction, each party to that
transaction who receives a copy of the work also receives whatever
licenses to the work the party’s predecessor in interest had or
could give under the previous paragraph, plus a right to possession
of the Corresponding Source of the work from the predecessor in
interest, if the predecessor has it or can get it with reasonable
efforts.
You may not impose any further restrictions on the exercise of the
rights granted or affirmed under this License. For example, you
may not impose a license fee, royalty, or other charge for exercise
of rights granted under this License, and you may not initiate
litigation (including a cross-claim or counterclaim in a lawsuit)
alleging that any patent claim is infringed by making, using,
selling, offering for sale, or importing the Program or any portion
of it.
11. Patents.
A “contributor” is a copyright holder who authorizes use under this
License of the Program or a work on which the Program is based.
The work thus licensed is called the contributor’s “contributor
version”.
A contributor’s “essential patent claims” are all patent claims
owned or controlled by the contributor, whether already acquired or
hereafter acquired, that would be infringed by some manner,
permitted by this License, of making, using, or selling its
contributor version, but do not include claims that would be
infringed only as a consequence of further modification of the
contributor version. For purposes of this definition, “control”
includes the right to grant patent sublicenses in a manner
consistent with the requirements of this License.
Each contributor grants you a non-exclusive, worldwide,
royalty-free patent license under the contributor’s essential
patent claims, to make, use, sell, offer for sale, import and
otherwise run, modify and propagate the contents of its contributor
version.
In the following three paragraphs, a “patent license” is any
express agreement or commitment, however denominated, not to
enforce a patent (such as an express permission to practice a
patent or covenant not to sue for patent infringement). To “grant”
such a patent license to a party means to make such an agreement or
commitment not to enforce a patent against the party.
If you convey a covered work, knowingly relying on a patent
license, and the Corresponding Source of the work is not available
for anyone to copy, free of charge and under the terms of this
License, through a publicly available network server or other
readily accessible means, then you must either (1) cause the
Corresponding Source to be so available, or (2) arrange to deprive
yourself of the benefit of the patent license for this particular
work, or (3) arrange, in a manner consistent with the requirements
of this License, to extend the patent license to downstream
recipients. “Knowingly relying” means you have actual knowledge
that, but for the patent license, your conveying the covered work
in a country, or your recipient’s use of the covered work in a
country, would infringe one or more identifiable patents in that
country that you have reason to believe are valid.
If, pursuant to or in connection with a single transaction or
arrangement, you convey, or propagate by procuring conveyance of, a
covered work, and grant a patent license to some of the parties
receiving the covered work authorizing them to use, propagate,
modify or convey a specific copy of the covered work, then the
patent license you grant is automatically extended to all
recipients of the covered work and works based on it.
A patent license is “discriminatory” if it does not include within
the scope of its coverage, prohibits the exercise of, or is
conditioned on the non-exercise of one or more of the rights that
are specifically granted under this License. You may not convey a
covered work if you are a party to an arrangement with a third
party that is in the business of distributing software, under which
you make payment to the third party based on the extent of your
activity of conveying the work, and under which the third party
grants, to any of the parties who would receive the covered work
from you, a discriminatory patent license (a) in connection with
copies of the covered work conveyed by you (or copies made from
those copies), or (b) primarily for and in connection with specific
products or compilations that contain the covered work, unless you
entered into that arrangement, or that patent license was granted,
prior to 28 March 2007.
Nothing in this License shall be construed as excluding or limiting
any implied license or other defenses to infringement that may
otherwise be available to you under applicable patent law.
12. No Surrender of Others’ Freedom.
If conditions are imposed on you (whether by court order, agreement
or otherwise) that contradict the conditions of this License, they
do not excuse you from the conditions of this License. If you
cannot convey a covered work so as to satisfy simultaneously your
obligations under this License and any other pertinent obligations,
then as a consequence you may not convey it at all. For example,
if you agree to terms that obligate you to collect a royalty for
further conveying from those to whom you convey the Program, the
only way you could satisfy both those terms and this License would
be to refrain entirely from conveying the Program.
13. Use with the GNU Affero General Public License.
Notwithstanding any other provision of this License, you have
permission to link or combine any covered work with a work licensed
under version 3 of the GNU Affero General Public License into a
single combined work, and to convey the resulting work. The terms
of this License will continue to apply to the part which is the
covered work, but the special requirements of the GNU Affero
General Public License, section 13, concerning interaction through
a network will apply to the combination as such.
14. Revised Versions of this License.
The Free Software Foundation may publish revised and/or new
versions of the GNU General Public License from time to time. Such
new versions will be similar in spirit to the present version, but
may differ in detail to address new problems or concerns.
Each version is given a distinguishing version number. If the
Program specifies that a certain numbered version of the GNU
General Public License “or any later version” applies to it, you
have the option of following the terms and conditions either of
that numbered version or of any later version published by the Free
Software Foundation. If the Program does not specify a version
number of the GNU General Public License, you may choose any
version ever published by the Free Software Foundation.
If the Program specifies that a proxy can decide which future
versions of the GNU General Public License can be used, that
proxy’s public statement of acceptance of a version permanently
authorizes you to choose that version for the Program.
Later license versions may give you additional or different
permissions. However, no additional obligations are imposed on any
author or copyright holder as a result of your choosing to follow a
later version.
15. Disclaimer of Warranty.
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE
COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM “AS IS”
WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE
RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.
SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL
NECESSARY SERVICING, REPAIR OR CORRECTION.
16. Limitation of Liability.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES
AND/OR CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR
DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR
CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE
THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA
BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF
THE POSSIBILITY OF SUCH DAMAGES.
17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely
approximates an absolute waiver of all civil liability in
connection with the Program, unless a warranty or assumption of
liability accompanies a copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
=============================================
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these
terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least the
“copyright” line and a pointer to where the full notice is found.
ONE LINE TO GIVE THE PROGRAM'S NAME AND A BRIEF IDEA OF WHAT IT DOES.
Copyright (C) YEAR NAME OF AUTHOR
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short notice
like this when it starts in an interactive mode:
PROGRAM Copyright (C) YEAR NAME OF AUTHOR
This program comes with ABSOLUTELY NO WARRANTY; for details
type ‘show w’. This is free software, and you are
welcome to redistribute it under certain conditions;
type ‘show c’ for details.
The hypothetical commands ‘show w’ and ‘show c’ should show the
appropriate parts of the General Public License. Of course, your
program’s commands might be different; for a GUI interface, you would
use an “about box”.
You should also get your employer (if you work as a programmer) or
school, if any, to sign a “copyright disclaimer” for the program, if
necessary. For more information on this, and how to apply and follow
the GNU GPL, see <https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your
program into proprietary programs. If your program is a subroutine
library, you may consider it more useful to permit linking proprietary
applications with the library. If this is what you want to do, use the
GNU Lesser General Public License instead of this License. But first,
please read <https://www.gnu.org/philosophy/why-not-lgpl.html>.
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