This is gnutls-guile.info, produced by makeinfo version 6.8 from gnutls-guile.texi. This manual is last updated 9 February 2023 for version 3.7.9 of GnuTLS. Copyright (C) 2001-2012, 2014, 2016, 2019, 2022 Free Software Foundation, Inc. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License". INFO-DIR-SECTION Software libraries START-INFO-DIR-ENTRY * GnuTLS-Guile: (gnutls-guile). GNU Transport Layer Security Library. Guile bindings. END-INFO-DIR-ENTRY  File: gnutls-guile.info, Node: Top, Next: Preface, Up: (dir) GnuTLS-Guile ************ This manual is last updated 9 February 2023 for version 3.7.9 of GnuTLS. Copyright (C) 2001-2012, 2014, 2016, 2019, 2022 Free Software Foundation, Inc. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License". * Menu: * Preface:: Preface. * Guile Preparations:: Note on installation and environment. * Guile API Conventions:: Naming conventions and other idiosyncrasies. * Guile Examples:: Quick start. * Guile Reference:: The Scheme GnuTLS programming interface. * Copying Information:: You can copy and modify this manual. * Procedure Index:: * Concept Index::  File: gnutls-guile.info, Node: Preface, Next: Guile Preparations, Prev: Top, Up: Top 1 Preface ********* This manual describes the GNU Guile (https://www.gnu.org/software/guile/) Scheme programming interface to GnuTLS, which is distributed as part of GnuTLS (https://gnutls.org). The reader is assumed to have basic knowledge of the protocol and library. Details missing from this chapter may be found in Function reference, of the C API reference. At this stage, not all the C functions are available from Scheme, but a large subset thereof is available.  File: gnutls-guile.info, Node: Guile Preparations, Next: Guile API Conventions, Prev: Preface, Up: Top 2 Guile Preparations ******************** The GnuTLS Guile bindings are available for the Guile 3.0 and 2.2 series, as well as the legacy 2.0 series. By default they are installed under the GnuTLS installation directory, typically '/usr/local/share/guile/site/'). Normally Guile will not find the module there without help. You may experience something like this: $ guile ... scheme@(guile-user)> (use-modules (gnutls)) ERROR: no code for module (gnutls) There are two ways to solve this. The first is to make sure that when building GnuTLS, the Guile bindings will be installed in the same place where Guile looks. You may do this by using the '--with-guile-site-dir' parameter as follows: $ ./configure --with-guile-site-dir=no This will instruct GnuTLS to attempt to install the Guile bindings where Guile will look for them. It will use 'guile-config info pkgdatadir' to learn the path to use. If Guile was installed into '/usr', you may also install GnuTLS using the same prefix: $ ./configure --prefix=/usr If you want to specify the path to install the Guile bindings you can also specify the path directly: $ ./configure --with-guile-site-dir=/opt/guile/share/guile/site The second solution requires some more work but may be easier to use if you do not have system administrator rights to your machine. You need to instruct Guile so that it finds the GnuTLS Guile bindings. Either use the 'GUILE_LOAD_PATH' environment variable as follows: $ GUILE_LOAD_PATH="/usr/local/share/guile/site:$GUILE_LOAD_PATH" guile scheme@(guile-user)> (use-modules (gnutls)) scheme@(guile-user)> Alternatively, you can modify Guile's '%load-path' variable (*note Guile's run-time options: (guile)Build Config.). At this point, you might get an error regarding 'guile-gnutls-v-2' similar to: gnutls.scm:361:1: In procedure dynamic-link in expression (load-extension "guile-gnutls-v-2" "scm_init_gnutls"): gnutls.scm:361:1: file: "guile-gnutls-v-2", message: "guile-gnutls-v-2.so: cannot open shared object file: No such file or directory" In this case, you will need to modify the run-time linker path, for example as follows: $ LD_LIBRARY_PATH=/usr/local/lib GUILE_LOAD_PATH=/usr/local/share/guile/site guile scheme@(guile-user)> (use-modules (gnutls)) scheme@(guile-user)> To check that you got the intended GnuTLS library version, you may print the version number of the loaded library as follows: $ guile scheme@(guile-user)> (use-modules (gnutls)) scheme@(guile-user)> (gnutls-version) "3.7.9" scheme@(guile-user)>  File: gnutls-guile.info, Node: Guile API Conventions, Next: Guile Examples, Prev: Guile Preparations, Up: Top 3 Guile API Conventions *********************** This chapter details the conventions used by Guile API, as well as specificities of the mapping of the C API to Scheme. * Menu: * Enumerates and Constants:: Representation of C-side constants. * Procedure Names:: Naming conventions. * Representation of Binary Data:: Binary data buffers. * Input and Output:: Input and output. * Exception Handling:: Exceptions.  File: gnutls-guile.info, Node: Enumerates and Constants, Next: Procedure Names, Up: Guile API Conventions 3.1 Enumerates and Constants ============================ Lots of enumerates and constants are used in the GnuTLS C API. For each C enumerate type, a disjoint Scheme type is used--thus, enumerate values and constants are not represented by Scheme symbols nor by integers. This makes it impossible to use an enumerate value of the wrong type on the Scheme side: such errors are automatically detected by type-checking. The enumerate values are bound to variables exported by the '(gnutls)' module. These variables are named according to the following convention: * All variable names are lower-case; the underscore '_' character used in the C API is replaced by hyphen '-'. * All variable names are prepended by the name of the enumerate type and the slash '/' character. * In some cases, the variable name is made more explicit than the one of the C API, e.g., by avoid abbreviations. Consider for instance this C-side enumerate: typedef enum { GNUTLS_CRD_CERTIFICATE = 1, GNUTLS_CRD_ANON, GNUTLS_CRD_SRP, GNUTLS_CRD_PSK } gnutls_credentials_type_t; The corresponding Scheme values are bound to the following variables exported by the '(gnutls)' module: credentials/certificate credentials/anonymous credentials/srp credentials/psk Hopefully, most variable names can be deduced from this convention. Scheme-side "enumerate" values can be compared using 'eq?' (*note equality predicates: (guile)Equality.). Consider the following example: (let ((session (make-session connection-end/client))) ;; ;; ... ;; ;; Check the ciphering algorithm currently used by SESSION. (if (eq? cipher/arcfour (session-cipher session)) (format #t "We're using the ARCFOUR algorithm"))) In addition, all enumerate values can be converted to a human-readable string, in a type-specific way. For instance, '(cipher->string cipher/arcfour)' yields '"ARCFOUR 128"', while '(key-usage->string key-usage/digital-signature)' yields '"digital-signature"'. Note that these strings may not be sufficient for use in a user interface since they are fairly concise and not internationalized.  File: gnutls-guile.info, Node: Procedure Names, Next: Representation of Binary Data, Prev: Enumerates and Constants, Up: Guile API Conventions 3.2 Procedure Names =================== Unlike C functions in GnuTLS, the corresponding Scheme procedures are named in a way that is close to natural English. Abbreviations are also avoided. For instance, the Scheme procedure corresponding to 'gnutls_certificate_set_dh_params' is named 'set-certificate-credentials-dh-parameters!'. The 'gnutls_' prefix is always omitted from variable names since a similar effect can be achieved using Guile's nifty binding renaming facilities, should it be needed (*note (guile)Using Guile Modules::). Often Scheme procedure names differ from C function names in a way that makes it clearer what objects they operate on. For example, the Scheme procedure named 'set-session-transport-port!' corresponds to 'gnutls_transport_set_ptr', making it clear that this procedure applies to session.  File: gnutls-guile.info, Node: Representation of Binary Data, Next: Input and Output, Prev: Procedure Names, Up: Guile API Conventions 3.3 Representation of Binary Data ================================= Many procedures operate on binary data. For instance, 'pkcs3-import-dh-parameters' expects binary data as input. Binary data is represented on the Scheme side using bytevectors (*note (guile)Bytevectors::). Homogeneous vectors such as SRFI-4 'u8vector's can also be used(1). As an example, generating and then exporting Diffie-Hellman parameters in the PEM format can be done as follows: (let* ((dh (make-dh-parameters 1024)) (pem (pkcs3-export-dh-parameters dh x509-certificate-format/pem))) (call-with-output-file "some-file.pem" (lambda (port) (uniform-vector-write pem port)))) ---------- Footnotes ---------- (1) Historically, SRFI-4 'u8vector's are the closest thing to bytevectors that Guile 1.8 and earlier supported.  File: gnutls-guile.info, Node: Input and Output, Next: Exception Handling, Prev: Representation of Binary Data, Up: Guile API Conventions 3.4 Input and Output ==================== The underlying transport of a TLS session can be any Scheme input/output port (*note (guile)Ports and File Descriptors::). This has to be specified using 'set-session-transport-port!'. However, for better performance, a raw file descriptor can be specified, using 'set-session-transport-fd!'. For instance, if the transport layer is a socket port over an OS-provided socket, you can use the 'port->fdes' or 'fileno' procedure to obtain the underlying file descriptor and pass it to 'set-session-transport-fd!' (*note 'port->fdes' and 'fileno': (guile)Ports and File Descriptors.). This would work as follows: (let ((socket (socket PF_INET SOCK_STREAM 0)) (session (make-session connection-end/client))) ;; ;; Establish a TCP connection... ;; ;; Use the file descriptor that underlies SOCKET. (set-session-transport-fd! session (fileno socket))) Once a TLS session is established, data can be communicated through it (i.e., _via_ the TLS record layer) using the port returned by 'session-record-port': (let ((session (make-session connection-end/client))) ;; ;; Initialize the various parameters of SESSION, set up ;; a network connection, etc. ;; (let ((i/o (session-record-port session))) (display "Hello peer!" i/o) (let ((greetings (read i/o))) ;; ... (bye session close-request/rdwr)))) Note that each write to the session record port leads to the transmission of an encrypted TLS "Application Data" packet. In the above example, we create an Application Data packet for the 11 bytes for the string that we write. This is not efficient both in terms of CPU usage and bandwidth (each packet adds at least 5 bytes of overhead and can lead to one 'write' system call), so we recommend that applications do their own buffering. A lower-level I/O API is provided by 'record-send' and 'record-receive!' which take a bytevector (or a SRFI-4 vector) to represent the data sent or received. While it might improve performance, it is much less convenient than the session record port and should rarely be needed.  File: gnutls-guile.info, Node: Exception Handling, Prev: Input and Output, Up: Guile API Conventions 3.5 Exception Handling ====================== GnuTLS errors are implemented as Scheme exceptions (*note exceptions in Guile: (guile)Exceptions.). Each time a GnuTLS function returns an error, an exception with key 'gnutls-error' is raised. The additional arguments that are thrown include an error code and the name of the GnuTLS procedure that raised the exception. The error code is pretty much like an enumerate value: it is one of the 'error/' variables exported by the '(gnutls)' module (*note Enumerates and Constants::). Exceptions can be turned into error messages using the 'error->string' procedure. The following examples illustrates how GnuTLS exceptions can be handled: (let ((session (make-session connection-end/server))) ;; ;; ... ;; (catch 'gnutls-error (lambda () (handshake session)) (lambda (key err function . currently-unused) (format (current-error-port) "a GnuTLS error was raised by `~a': ~a~%" function (error->string err))))) Again, error values can be compared using 'eq?': ;; `gnutls-error' handler. (lambda (key err function . currently-unused) (if (eq? err error/fatal-alert-received) (format (current-error-port) "a fatal alert was caught!~%") (format (current-error-port) "something bad happened: ~a~%" (error->string err)))) Note that the 'catch' handler is currently passed only 3 arguments but future versions might provide it with additional arguments. Thus, it must be prepared to handle more than 3 arguments, as in this example.  File: gnutls-guile.info, Node: Guile Examples, Next: Guile Reference, Prev: Guile API Conventions, Up: Top 4 Guile Examples **************** This chapter provides examples that illustrate common use cases. * Menu: * Anonymous Authentication Guile Example:: Simplest client and server.  File: gnutls-guile.info, Node: Anonymous Authentication Guile Example, Up: Guile Examples 4.1 Anonymous Authentication Guile Example ========================================== "Anonymous authentication" is very easy to use. No certificates are needed by the communicating parties. Yet, it allows them to benefit from end-to-end encryption and integrity checks. The client-side code would look like this (assuming SOME-SOCKET is bound to an open socket port): ;; Client-side. (let ((client (make-session connection-end/client))) ;; Use the default settings. (set-session-default-priority! client) ;; Don't use certificate-based authentication. (set-session-certificate-type-priority! client '()) ;; Request the "anonymous Diffie-Hellman" key exchange method. (set-session-kx-priority! client (list kx/anon-dh)) ;; Specify the underlying socket. (set-session-transport-fd! client (fileno some-socket)) ;; Create anonymous credentials. (set-session-credentials! client (make-anonymous-client-credentials)) ;; Perform the TLS handshake with the server. (handshake client) ;; Send data over the TLS record layer. (write "hello, world!" (session-record-port client)) ;; Terminate the TLS session. (bye client close-request/rdwr)) The corresponding server would look like this (again, assuming SOME-SOCKET is bound to a socket port): ;; Server-side. (let ((server (make-session connection-end/server))) (set-session-default-priority! server) (set-session-certificate-type-priority! server '()) (set-session-kx-priority! server (list kx/anon-dh)) ;; Specify the underlying transport socket. (set-session-transport-fd! server (fileno some-socket)) ;; Create anonymous credentials. (let ((cred (make-anonymous-server-credentials)) (dh-params (make-dh-parameters 1024))) ;; Note: DH parameter generation can take some time. (set-anonymous-server-dh-parameters! cred dh-params) (set-session-credentials! server cred)) ;; Perform the TLS handshake with the client. (handshake server) ;; Receive data over the TLS record layer. (let ((message (read (session-record-port server)))) (format #t "received the following message: ~a~%" message) (bye server close-request/rdwr))) This is it!  File: gnutls-guile.info, Node: Guile Reference, Next: Copying Information, Prev: Guile Examples, Up: Top 5 Guile Reference ***************** This chapter lists the GnuTLS Scheme procedures exported by the '(gnutls)' module (*note (guile)The Guile module system::). -- Scheme Procedure: set-log-level! level Enable GnuTLS logging up to LEVEL (an integer). -- Scheme Procedure: set-log-procedure! proc Use PROC (a two-argument procedure) as the global GnuTLS log procedure. -- Scheme Procedure: %set-certificate-credentials-openpgp-keys! cred pub sec Use certificate PUB and secret key SEC in certificate credentials CRED. -- Scheme Procedure: %openpgp-keyring-contains-key-id? keyring id Return '#f' if key ID ID is in KEYRING, '#f' otherwise. -- Scheme Procedure: import-openpgp-keyring data format Import DATA (a u8vector) according to FORMAT and return the imported keyring. -- Scheme Procedure: %openpgp-certificate-usage key Return a list of values denoting the key usage of KEY. -- Scheme Procedure: %openpgp-certificate-version key Return the version of the OpenPGP message format (RFC2440) honored by KEY. -- Scheme Procedure: %openpgp-certificate-algorithm key Return two values: the certificate algorithm used by KEY and the number of bits used. -- Scheme Procedure: %openpgp-certificate-names key Return the list of names for KEY. -- Scheme Procedure: %openpgp-certificate-name key index Return the INDEXth name of KEY. -- Scheme Procedure: %openpgp-certificate-fingerprint key Return a new u8vector denoting the fingerprint of KEY. -- Scheme Procedure: %openpgp-certificate-fingerprint! key fpr Store in FPR (a u8vector) the fingerprint of KEY. Return the number of bytes stored in FPR. -- Scheme Procedure: %openpgp-certificate-id! key id Store the ID (an 8 byte sequence) of certificate KEY in ID (a u8vector). -- Scheme Procedure: %openpgp-certificate-id key Return the ID (an 8-element u8vector) of certificate KEY. -- Scheme Procedure: %import-openpgp-private-key data format [pass] Return a new OpenPGP private key object resulting from the import of DATA (a uniform array) according to FORMAT. Optionally, a passphrase may be provided. -- Scheme Procedure: %import-openpgp-certificate data format Return a new OpenPGP certificate object resulting from the import of DATA (a uniform array) according to FORMAT. -- Scheme Procedure: x509-certificate-fingerprint cert algo Return the fingerprint (a u8vector) of the certificate CERT, computed using the digest algorithm ALGO. -- Scheme Procedure: x509-certificate-subject-alternative-name cert index Return two values: the alternative name type for CERT (i.e., one of the 'x509-subject-alternative-name/' values) and the actual subject alternative name (a string) at INDEX. Both values are '#f' if no alternative name is available at INDEX. -- Scheme Procedure: x509-certificate-subject-key-id cert Return the subject key ID (a u8vector) for CERT. -- Scheme Procedure: x509-certificate-authority-key-id cert Return the key ID (a u8vector) of the X.509 certificate authority of CERT. -- Scheme Procedure: x509-certificate-key-id cert Return a statistically unique ID (a u8vector) for CERT that depends on its public key parameters. This is normally a 20-byte SHA-1 hash. -- Scheme Procedure: x509-certificate-version cert Return the version of CERT. -- Scheme Procedure: x509-certificate-key-usage cert Return the key usage of CERT (i.e., a list of 'key-usage/' values), or the empty list if CERT does not contain such information. -- Scheme Procedure: x509-certificate-public-key-algorithm cert Return two values: the public key algorithm (i.e., one of the 'pk-algorithm/' values) of CERT and the number of bits used. -- Scheme Procedure: x509-certificate-signature-algorithm cert Return the signature algorithm used by CERT (i.e., one of the 'sign-algorithm/' values). -- Scheme Procedure: x509-certificate-matches-hostname? cert hostname Return true if CERT matches HOSTNAME, a string denoting a DNS host name. This is the basic implementation of RFC 2818 (https://tools.ietf.org/html/rfc2818) (aka. HTTPS). -- Scheme Procedure: x509-certificate-issuer-dn-oid cert index Return the OID (a string) at INDEX from CERT's issuer DN. Return '#f' if no OID is available at INDEX. -- Scheme Procedure: x509-certificate-dn-oid cert index Return OID (a string) at INDEX from CERT. Return '#f' if no OID is available at INDEX. -- Scheme Procedure: x509-certificate-issuer-dn cert Return the distinguished name (DN) of X.509 certificate CERT. -- Scheme Procedure: x509-certificate-dn cert Return the distinguished name (DN) of X.509 certificate CERT. The form of the DN is as described in RFC 2253 (https://tools.ietf.org/html/rfc2253). -- Scheme Procedure: pkcs8-import-x509-private-key data format [pass [encrypted]] Return a new X.509 private key object resulting from the import of DATA (a uniform array) according to FORMAT. Optionally, if PASS is not '#f', it should be a string denoting a passphrase. ENCRYPTED tells whether the private key is encrypted ('#t' by default). -- Scheme Procedure: import-x509-private-key data format Return a new X.509 private key object resulting from the import of DATA (a uniform array) according to FORMAT. -- Scheme Procedure: import-x509-certificate data format Return a new X.509 certificate object resulting from the import of DATA (a uniform array) according to FORMAT. -- Scheme Procedure: server-session-psk-username session Return the username associated with PSK server session SESSION. -- Scheme Procedure: set-psk-client-credentials! cred username key key-format Set the client credentials for CRED, a PSK client credentials object. -- Scheme Procedure: make-psk-client-credentials Return a new PSK client credentials object. -- Scheme Procedure: set-psk-server-credentials-file! cred file Use FILE as the password file for PSK server credentials CRED. -- Scheme Procedure: make-psk-server-credentials Return new PSK server credentials. -- Scheme Procedure: peer-certificate-status session Verify the peer certificate for SESSION and return a list of 'certificate-status' values (such as 'certificate-status/revoked'), or the empty list if the certificate is valid. -- Scheme Procedure: set-certificate-credentials-verify-flags! cred [flags...] Set the certificate verification flags to FLAGS, a series of 'certificate-verify' values. -- Scheme Procedure: set-certificate-credentials-verify-limits! cred max-bits max-depth Set the verification limits of 'peer-certificate-status' for certificate credentials CRED to MAX_BITS bits for an acceptable certificate and MAX_DEPTH as the maximum depth of a certificate chain. -- Scheme Procedure: set-certificate-credentials-x509-keys! cred certs privkey Have certificate credentials CRED use the X.509 certificates listed in CERTS and X.509 private key PRIVKEY. -- Scheme Procedure: set-certificate-credentials-x509-key-data! cred cert key format Use X.509 certificate CERT and private key KEY, both uniform arrays containing the X.509 certificate and key in format FORMAT, for certificate credentials CRED. -- Scheme Procedure: set-certificate-credentials-x509-crl-data! cred data format Use DATA (a uniform array) as the X.509 CRL (certificate revocation list) database for CRED. On success, return the number of CRLs processed. -- Scheme Procedure: set-certificate-credentials-x509-trust-data! cred data format Use DATA (a uniform array) as the X.509 trust database for CRED. On success, return the number of certificates processed. -- Scheme Procedure: set-certificate-credentials-x509-crl-file! cred file format Use FILE as the X.509 CRL (certificate revocation list) file for certificate credentials CRED. On success, return the number of CRLs processed. -- Scheme Procedure: set-certificate-credentials-x509-trust-file! cred file format Use FILE as the X.509 trust file for certificate credentials CRED. On success, return the number of certificates processed. -- Scheme Procedure: set-certificate-credentials-x509-key-files! cred cert-file key-file format Use FILE as the password file for PSK server credentials CRED. -- Scheme Procedure: set-certificate-credentials-dh-parameters! cred dh-params Use Diffie-Hellman parameters DH_PARAMS for certificate credentials CRED. -- Scheme Procedure: make-certificate-credentials Return new certificate credentials (i.e., for use with either X.509 or OpenPGP certificates. -- Scheme Procedure: set-anonymous-server-dh-parameters! cred dh-params Set the Diffie-Hellman parameters of anonymous server credentials CRED. -- Scheme Procedure: make-anonymous-client-credentials Return anonymous client credentials. -- Scheme Procedure: make-anonymous-server-credentials Return anonymous server credentials. -- Scheme Procedure: set-session-dh-prime-bits! session bits Use BITS DH prime bits for SESSION. -- Scheme Procedure: pkcs3-export-dh-parameters dh-params format Export Diffie-Hellman parameters DH_PARAMS in PKCS3 format according for FORMAT (an 'x509-certificate-format' value). Return a 'u8vector' containing the result. -- Scheme Procedure: pkcs3-import-dh-parameters array format Import Diffie-Hellman parameters in PKCS3 format (further specified by FORMAT, an 'x509-certificate-format' value) from ARRAY (a homogeneous array) and return a new 'dh-params' object. -- Scheme Procedure: make-dh-parameters bits Return new Diffie-Hellman parameters. -- Scheme Procedure: set-session-transport-port! session port Use PORT as the input/output port for SESSION. -- Scheme Procedure: set-session-transport-fd! session fd Use file descriptor FD as the underlying transport for SESSION. -- Scheme Procedure: set-session-record-port-close! port close Set CLOSE, a one-argument procedure, as the procedure called when PORT is closed. CLOSE will be passed PORT. It may be called when 'close-port' is called on PORT, or when PORT is garbage-collected. It is a useful way to free resources associated with PORT such as the session's transport file descriptor or port. -- Scheme Procedure: session-record-port session [close] Return a read-write port that may be used to communicate over SESSION. All invocations of 'session-port' on a given session return the same object (in the sense of 'eq?'). If CLOSE is provided, it must be a one-argument procedure, and it will be called when the returned port is closed. This is equivalent to setting it by calling 'set-session-record-port-close!'. -- Scheme Procedure: record-receive! session array Receive data from SESSION into ARRAY, a uniform homogeneous array. Return the number of bytes actually received. -- Scheme Procedure: record-send session array Send the record constituted by ARRAY through SESSION. -- Scheme Procedure: set-session-server-name! session type name For a client, this procedure provides a way to inform the server that it is known under NAME, via the 'SERVER NAME' TLS extension. TYPE must be a 'server-name-type' value, SERVER-NAME-TYPE/DNS for DNS names. -- Scheme Procedure: set-session-credentials! session cred Use CRED as SESSION's credentials. -- Scheme Procedure: cipher-suite->string kx cipher mac Return the name of the given cipher suite. -- Scheme Procedure: set-session-priorities! session priorities Have SESSION use the given PRIORITIES for the ciphers, key exchange methods, MACs and compression methods. PRIORITIES must be a string (*note (gnutls)Priority Strings::). When PRIORITIES cannot be parsed, an 'error/invalid-request' error is raised, with an extra argument indication the position of the error. -- Scheme Procedure: set-session-default-priority! session Have SESSION use the default priorities. -- Scheme Procedure: set-server-session-certificate-request! session request Tell how SESSION, a server-side session, should deal with certificate requests. REQUEST should be either 'certificate-request/request' or 'certificate-request/require'. -- Scheme Procedure: session-our-certificate-chain session Return our certificate chain for SESSION (as sent to the peer) in raw format (a u8vector). In the case of OpenPGP there is exactly one certificate. Return the empty list if no certificate was used. -- Scheme Procedure: session-peer-certificate-chain session Return the a list of certificates in raw format (u8vectors) where the first one is the peer's certificate. In the case of OpenPGP, there is always exactly one certificate. In the case of X.509, subsequent certificates indicate form a certificate chain. Return the empty list if no certificate was sent. -- Scheme Procedure: session-client-authentication-type session Return the client authentication type (a 'credential-type' value) used in SESSION. -- Scheme Procedure: session-server-authentication-type session Return the server authentication type (a 'credential-type' value) used in SESSION. -- Scheme Procedure: session-authentication-type session Return the authentication type (a 'credential-type' value) used by SESSION. -- Scheme Procedure: session-protocol session Return the protocol used by SESSION. -- Scheme Procedure: session-certificate-type session Return SESSION's certificate type. -- Scheme Procedure: session-compression-method session Return SESSION's compression method. -- Scheme Procedure: session-mac session Return SESSION's MAC. -- Scheme Procedure: session-kx session Return SESSION's kx. -- Scheme Procedure: session-cipher session Return SESSION's cipher. -- Scheme Procedure: alert-send session level alert Send ALERT via SESSION. -- Scheme Procedure: alert-get session Get an aleter from SESSION. -- Scheme Procedure: reauthenticate session Perform a re-authentication step for SESSION. -- Scheme Procedure: rehandshake session Perform a re-handshaking for SESSION. -- Scheme Procedure: handshake session Perform a handshake for SESSION. -- Scheme Procedure: bye session how Close SESSION according to HOW. -- Scheme Procedure: make-session end [flags...] Return a new session for connection end END, either 'connection-end/server' or 'connection-end/client'. The optional FLAGS arguments are 'connection-flag' values such as 'connection-flag/auto-reauth'. -- Scheme Procedure: gnutls-version Return a string denoting the version number of the underlying GnuTLS library, e.g., '"1.7.2"'. -- Scheme Procedure: openpgp-keyring? obj Return true if OBJ is of type 'openpgp-keyring'. -- Scheme Procedure: openpgp-private-key? obj Return true if OBJ is of type 'openpgp-private-key'. -- Scheme Procedure: openpgp-certificate? obj Return true if OBJ is of type 'openpgp-certificate'. -- Scheme Procedure: x509-private-key? obj Return true if OBJ is of type 'x509-private-key'. -- Scheme Procedure: x509-certificate? obj Return true if OBJ is of type 'x509-certificate'. -- Scheme Procedure: psk-client-credentials? obj Return true if OBJ is of type 'psk-client-credentials'. -- Scheme Procedure: psk-server-credentials? obj Return true if OBJ is of type 'psk-server-credentials'. -- Scheme Procedure: srp-client-credentials? obj Return true if OBJ is of type 'srp-client-credentials'. -- Scheme Procedure: srp-server-credentials? obj Return true if OBJ is of type 'srp-server-credentials'. -- Scheme Procedure: certificate-credentials? obj Return true if OBJ is of type 'certificate-credentials'. -- Scheme Procedure: dh-parameters? obj Return true if OBJ is of type 'dh-parameters'. -- Scheme Procedure: anonymous-server-credentials? obj Return true if OBJ is of type 'anonymous-server-credentials'. -- Scheme Procedure: anonymous-client-credentials? obj Return true if OBJ is of type 'anonymous-client-credentials'. -- Scheme Procedure: session? obj Return true if OBJ is of type 'session'. -- Scheme Procedure: openpgp-certificate-format->string enumval Return a string describing ENUMVAL, a 'openpgp-certificate-format' value. -- Scheme Procedure: error->string enumval Return a string describing ENUMVAL, a 'error' value. -- Scheme Procedure: certificate-verify->string enumval Return a string describing ENUMVAL, a 'certificate-verify' value. -- Scheme Procedure: key-usage->string enumval Return a string describing ENUMVAL, a 'key-usage' value. -- Scheme Procedure: psk-key-format->string enumval Return a string describing ENUMVAL, a 'psk-key-format' value. -- Scheme Procedure: server-name-type->string enumval Return a string describing ENUMVAL, a 'server-name-type' value. -- Scheme Procedure: sign-algorithm->string enumval Return a string describing ENUMVAL, a 'sign-algorithm' value. -- Scheme Procedure: pk-algorithm->string enumval Return a string describing ENUMVAL, a 'pk-algorithm' value. -- Scheme Procedure: x509-subject-alternative-name->string enumval Return a string describing ENUMVAL, a 'x509-subject-alternative-name' value. -- Scheme Procedure: x509-certificate-format->string enumval Return a string describing ENUMVAL, a 'x509-certificate-format' value. -- Scheme Procedure: certificate-type->string enumval Return a string describing ENUMVAL, a 'certificate-type' value. -- Scheme Procedure: protocol->string enumval Return a string describing ENUMVAL, a 'protocol' value. -- Scheme Procedure: close-request->string enumval Return a string describing ENUMVAL, a 'close-request' value. -- Scheme Procedure: certificate-request->string enumval Return a string describing ENUMVAL, a 'certificate-request' value. -- Scheme Procedure: certificate-status->string enumval Return a string describing ENUMVAL, a 'certificate-status' value. -- Scheme Procedure: handshake-description->string enumval Return a string describing ENUMVAL, a 'handshake-description' value. -- Scheme Procedure: alert-description->string enumval Return a string describing ENUMVAL, a 'alert-description' value. -- Scheme Procedure: alert-level->string enumval Return a string describing ENUMVAL, a 'alert-level' value. -- Scheme Procedure: connection-flag->string enumval Return a string describing ENUMVAL, a 'connection-flag' value. -- Scheme Procedure: connection-end->string enumval Return a string describing ENUMVAL, a 'connection-end' value. -- Scheme Procedure: compression-method->string enumval Return a string describing ENUMVAL, a 'compression-method' value. -- Scheme Procedure: digest->string enumval Return a string describing ENUMVAL, a 'digest' value. -- Scheme Procedure: mac->string enumval Return a string describing ENUMVAL, a 'mac' value. -- Scheme Procedure: credentials->string enumval Return a string describing ENUMVAL, a 'credentials' value. -- Scheme Procedure: params->string enumval Return a string describing ENUMVAL, a 'params' value. -- Scheme Procedure: kx->string enumval Return a string describing ENUMVAL, a 'kx' value. -- Scheme Procedure: cipher->string enumval Return a string describing ENUMVAL, a 'cipher' value.  File: gnutls-guile.info, Node: Copying Information, Next: Procedure Index, Prev: Guile Reference, Up: Top Appendix A Copying Information ****************************** GNU Free Documentation License ============================== Version 1.3, 3 November 2008 Copyright (C) 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc. Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. 0. PREAMBLE The purpose of this License is to make a manual, textbook, or other functional and useful document "free" in the sense of freedom: to assure everyone the effective freedom to copy and redistribute it, with or without modifying it, either commercially or noncommercially. Secondarily, this License preserves for the author and publisher a way to get credit for their work, while not being considered responsible for modifications made by others. 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ADDENDUM: How to use this License for your documents ==================================================== To use this License in a document you have written, include a copy of the License in the document and put the following copyright and license notices just after the title page: Copyright (C) YEAR YOUR NAME. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled ``GNU Free Documentation License''. If you have Invariant Sections, Front-Cover Texts and Back-Cover Texts, replace the "with...Texts." line with this: with the Invariant Sections being LIST THEIR TITLES, with the Front-Cover Texts being LIST, and with the Back-Cover Texts being LIST. If you have Invariant Sections without Cover Texts, or some other combination of the three, merge those two alternatives to suit the situation. If your document contains nontrivial examples of program code, we recommend releasing these examples in parallel under your choice of free software license, such as the GNU General Public License, to permit their use in free software.  File: gnutls-guile.info, Node: Procedure Index, Next: Concept Index, Prev: Copying Information, Up: Top Procedure Index *************** [index] * Menu: * %import-openpgp-certificate: Guile Reference. (line 64) * %import-openpgp-private-key: Guile Reference. (line 59) * %openpgp-certificate-algorithm: Guile Reference. (line 35) * %openpgp-certificate-fingerprint: Guile Reference. (line 45) * %openpgp-certificate-fingerprint!: Guile Reference. (line 48) * %openpgp-certificate-id: Guile Reference. (line 56) * %openpgp-certificate-id!: Guile Reference. (line 52) * %openpgp-certificate-name: Guile Reference. (line 42) * %openpgp-certificate-names: Guile Reference. (line 39) * %openpgp-certificate-usage: Guile Reference. (line 28) * %openpgp-certificate-version: Guile Reference. (line 31) * %openpgp-keyring-contains-key-id?: Guile Reference. (line 21) * %set-certificate-credentials-openpgp-keys!: Guile Reference. (line 16) * alert-description->string: Guile Reference. (line 470) * alert-get: Guile Reference. (line 351) * alert-level->string: Guile Reference. (line 473) * alert-send: Guile Reference. (line 348) * anonymous-client-credentials?: Guile Reference. (line 412) * anonymous-server-credentials?: Guile Reference. (line 409) * bye: Guile Reference. (line 363) * certificate-credentials?: Guile Reference. (line 403) * certificate-request->string: Guile Reference. (line 460) * certificate-status->string: Guile Reference. (line 463) * certificate-type->string: Guile Reference. (line 451) * certificate-verify->string: Guile Reference. (line 425) * cipher->string: Guile Reference. (line 500) * cipher-suite->string: Guile Reference. (line 287) * close-request->string: Guile Reference. (line 457) * compression-method->string: Guile Reference. (line 482) * connection-end->string: Guile Reference. (line 479) * connection-flag->string: Guile Reference. (line 476) * credentials->string: Guile Reference. (line 491) * dh-parameters?: Guile Reference. (line 406) * digest->string: Guile Reference. (line 485) * error->string: Exception Handling. (line 6) * error->string <1>: Guile Reference. (line 422) * gnutls-version: Guile Reference. (line 372) * handshake: Guile Reference. (line 360) * handshake-description->string: Guile Reference. (line 466) * import-openpgp-keyring: Guile Reference. (line 24) * import-x509-certificate: Guile Reference. (line 138) * import-x509-private-key: Guile Reference. (line 134) * key-usage->string: Guile Reference. (line 428) * kx->string: Guile Reference. (line 497) * mac->string: Guile Reference. (line 488) * make-anonymous-client-credentials: Guile Reference. (line 226) * make-anonymous-server-credentials: Guile Reference. (line 229) * make-certificate-credentials: Guile Reference. (line 218) * make-dh-parameters: Representation of Binary Data. (line 16) * make-dh-parameters <1>: Guile Reference. (line 245) * make-psk-client-credentials: Guile Reference. (line 150) * make-psk-server-credentials: Guile Reference. (line 156) * make-session: Guile Reference. (line 366) * openpgp-certificate-format->string: Guile Reference. (line 418) * openpgp-certificate?: Guile Reference. (line 382) * openpgp-keyring?: Guile Reference. (line 376) * openpgp-private-key?: Guile Reference. (line 379) * params->string: Guile Reference. (line 494) * peer-certificate-status: Guile Reference. (line 159) * pk-algorithm->string: Guile Reference. (line 440) * pkcs3-export-dh-parameters: Representation of Binary Data. (line 16) * pkcs3-export-dh-parameters <1>: Guile Reference. (line 235) * pkcs3-import-dh-parameters: Guile Reference. (line 240) * pkcs8-import-x509-private-key: Guile Reference. (line 127) * protocol->string: Guile Reference. (line 454) * psk-client-credentials?: Guile Reference. (line 391) * psk-key-format->string: Guile Reference. (line 431) * psk-server-credentials?: Guile Reference. (line 394) * reauthenticate: Guile Reference. (line 354) * record-receive!: Input and Output. (line 55) * record-receive! <1>: Guile Reference. (line 271) * record-send: Input and Output. (line 55) * record-send <1>: Guile Reference. (line 275) * rehandshake: Guile Reference. (line 357) * server-name-type->string: Guile Reference. (line 434) * server-session-psk-username: Guile Reference. (line 142) * session-authentication-type: Guile Reference. (line 326) * session-certificate-type: Guile Reference. (line 333) * session-cipher: Enumerates and Constants. (line 47) * session-cipher <1>: Guile Reference. (line 345) * session-client-authentication-type: Guile Reference. (line 318) * session-compression-method: Guile Reference. (line 336) * session-kx: Guile Reference. (line 342) * session-mac: Guile Reference. (line 339) * session-our-certificate-chain: Guile Reference. (line 306) * session-peer-certificate-chain: Guile Reference. (line 311) * session-protocol: Guile Reference. (line 330) * session-record-port: Input and Output. (line 28) * session-record-port <1>: Guile Reference. (line 261) * session-server-authentication-type: Guile Reference. (line 322) * session?: Guile Reference. (line 415) * set-anonymous-server-dh-parameters!: Guile Reference. (line 222) * set-certificate-credentials-dh-parameters!: Guile Reference. (line 213) * set-certificate-credentials-verify-flags!: Guile Reference. (line 164) * set-certificate-credentials-verify-limits!: Guile Reference. (line 169) * set-certificate-credentials-x509-crl-data!: Guile Reference. (line 187) * set-certificate-credentials-x509-crl-file!: Guile Reference. (line 198) * set-certificate-credentials-x509-key-data!: Guile Reference. (line 181) * set-certificate-credentials-x509-key-files!: Guile Reference. (line 209) * set-certificate-credentials-x509-keys!: Guile Reference. (line 176) * set-certificate-credentials-x509-trust-data!: Guile Reference. (line 193) * set-certificate-credentials-x509-trust-file!: Guile Reference. (line 204) * set-log-level!: Guile Reference. (line 9) * set-log-procedure!: Guile Reference. (line 12) * set-psk-client-credentials!: Guile Reference. (line 145) * set-psk-server-credentials-file!: Guile Reference. (line 153) * set-server-session-certificate-request!: Guile Reference. (line 300) * set-session-credentials!: Guile Reference. (line 284) * set-session-default-priority!: Guile Reference. (line 297) * set-session-dh-prime-bits!: Guile Reference. (line 232) * set-session-priorities!: Guile Reference. (line 290) * set-session-record-port-close!: Guile Reference. (line 254) * set-session-server-name!: Guile Reference. (line 278) * set-session-transport-fd!: Input and Output. (line 6) * set-session-transport-fd! <1>: Guile Reference. (line 251) * set-session-transport-port!: Input and Output. (line 6) * set-session-transport-port! <1>: Guile Reference. (line 248) * sign-algorithm->string: Guile Reference. (line 437) * srp-client-credentials?: Guile Reference. (line 397) * srp-server-credentials?: Guile Reference. (line 400) * x509-certificate-authority-key-id: Guile Reference. (line 82) * x509-certificate-dn: Guile Reference. (line 122) * x509-certificate-dn-oid: Guile Reference. (line 115) * x509-certificate-fingerprint: Guile Reference. (line 68) * x509-certificate-format->string: Guile Reference. (line 447) * x509-certificate-issuer-dn: Guile Reference. (line 119) * x509-certificate-issuer-dn-oid: Guile Reference. (line 111) * x509-certificate-key-id: Guile Reference. (line 86) * x509-certificate-key-usage: Guile Reference. (line 94) * x509-certificate-matches-hostname?: Guile Reference. (line 106) * x509-certificate-public-key-algorithm: Guile Reference. (line 98) * x509-certificate-signature-algorithm: Guile Reference. (line 102) * x509-certificate-subject-alternative-name: Guile Reference. (line 72) * x509-certificate-subject-key-id: Guile Reference. (line 79) * x509-certificate-version: Guile Reference. (line 91) * x509-certificate?: Guile Reference. (line 388) * x509-private-key?: Guile Reference. (line 385) * x509-subject-alternative-name->string: Guile Reference. (line 443)  File: gnutls-guile.info, Node: Concept Index, Prev: Procedure Index, Up: Top Concept Index ************* [index] * Menu: * buffering: Input and Output. (line 47) * bytevectors: Representation of Binary Data. (line 9) * constant: Enumerates and Constants. (line 6) * enumerate: Enumerates and Constants. (line 6) * errors: Exception Handling. (line 6) * exceptions: Exception Handling. (line 6) * FDL, GNU Free Documentation License: Copying Information. (line 6) * gnutls-error: Exception Handling. (line 6) * homogeneous vector: Representation of Binary Data. (line 9) * SRFI-4: Representation of Binary Data. (line 9)  Tag Table: Node: Top802 Node: Preface1874 Node: Guile Preparations2441 Node: Guile API Conventions5186 Node: Enumerates and Constants5760 Node: Procedure Names8085 Node: Representation of Binary Data9068 Ref: Representation of Binary Data-Footnote-19993 Node: Input and Output10109 Node: Exception Handling12454 Node: Guile Examples14282 Node: Anonymous Authentication Guile Example14581 Node: Guile Reference17098 Node: Copying Information37275 Node: Procedure Index62463 Node: Concept Index73486  End Tag Table  Local Variables: coding: utf-8 End: