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\begin {verbatim}
/* This file is actually an example of using the OpenCDK library
* to retrieve an OpenPGP key from a key server.
*/
#include <gnutls/gnutls.h>
#include <gnutls/extra.h>
#include <opencdk.h>
/* A callback function that tries to connect
* to a public keyserver to get the specified key.
* The callback should be set as:
*
* gnutls_openpgp_set_recv_key_function( session, recv_openpgp_key);
*
* in the initialization of a gnutls session.
*/
static const char *hostname = "keyserver.somewhere.com";
static const short port = 11371;
int
recv_openpgp_key(const unsigned char *keyfpr, unsigned int
keyfpr_length, gnutls_datum * key)
{
const unsigned char *keyid;
int rc;
CDK_KBNODE knode = NULL;
/* The key fingerprint should be 20 bytes
*/
if (keyfpr_length != 20)
return -1;
/* The key id is the last 4 bytes of the key fingerprint
*/
keyid = keyfpr[16];
if (key == NULL) {
return -1;
}
rc = cdk_keyserver_recv_key( hostname, port, keyid, &knode );
if( !rc ) {
unsigned char *buf = cdk_calloc( 1, 20001 );
size_t len = 20000;
cdk_kbnode_write_to_mem( knode, buf, &len);
datum_append( key, buf, len );
cdk_free( buf );
}
cdk_kbnode_release( knode );
return map_cdk_rc( rc );
}
\end{verbatim}
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