1 files changed, 104 insertions, 0 deletions
diff --git a/cipher/dynload.c b/cipher/dynload.c
new file mode 100644
index 0000000..05d82f6
--- /dev/null
+++ b/cipher/dynload.c
@@ -0,0 +1,104 @@
+/* dynload.c - load cipher extensions
+ *	Copyright (C) 1998, 1999, 2001, 2002 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+ * USA.
+ */
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "util.h"
+#include "cipher.h"
+#include "algorithms.h"
+
+
+typedef struct ext_list {
+    struct ext_list *next;
+    char name[1];
+} *EXTLIST;
+
+static EXTLIST extensions;
+
+/* This is actually not used anymore but we keep a list of already 
+ * set extensions modules here.   
+ *
+ * Here is the ancient comment:
+ * Register an extension module.  The last registered module will
+ * be loaded first.  A name may have a list of classes
+ * appended; e.g:
+ *	mymodule.so(1:17,3:20,3:109)
+ * means that this module provides digest algorithm 17 and public key
+ * algorithms 20 and 109.  This is only a hint but if it is there the
+ * loader may decide to only load a module which claims to have a
+ * requested algorithm.
+ *
+ * mainpgm is the path to the program which wants to load a module
+ * it is only used in some environments.
+ */
+void
+register_cipher_extension( const char *mainpgm, const char *fname )
+{
+    EXTLIST r, el, intex;
+    char *p, *pe;
+
+    if( *fname != DIRSEP_C ) { /* do tilde expansion etc */
+	char *tmp;
+
+	if( strchr(fname, DIRSEP_C) )
+	    tmp = make_filename(fname, NULL);
+	else
+	    tmp = make_filename(GNUPG_LIBDIR, fname, NULL);
+	el = xmalloc_clear( sizeof *el + strlen(tmp) );
+	strcpy(el->name, tmp );
+	xfree(tmp);
+    }
+    else {
+	el = xmalloc_clear( sizeof *el + strlen(fname) );
+	strcpy(el->name, fname );
+    }
+    /* check whether we have a class hint */
+    if( (p=strchr(el->name,'(')) && (pe=strchr(p+1,')')) && !pe[1] )
+	*p = *pe = 0;
+
+    /* check that it is not already registered */
+    intex = NULL;
+    for(r = extensions; r; r = r->next ) {
+	if( !compare_filenames(r->name, el->name) ) {
+	    log_info("extension `%s' already registered\n", el->name );
+	    xfree(el);
+	    return;
+	}
+    }
+    /* and register */
+    el->next = extensions;
+    extensions = el;
+}
+
+/* Return the module name with index SEQ, return NULL as as indication
+   for end of list. */
+const char *
+dynload_enum_module_names (int seq)
+{
+  EXTLIST el = extensions;
+
+  for (; el && el->name && seq; el = el->next, seq--)
+    ;
+  return el? el->name:NULL;
+}