summaryrefslogtreecommitdiff
path: root/ckcapi-der.c
diff options
context:
space:
mode:
Diffstat (limited to 'ckcapi-der.c')
-rw-r--r--ckcapi-der.c177
1 files changed, 177 insertions, 0 deletions
diff --git a/ckcapi-der.c b/ckcapi-der.c
new file mode 100644
index 0000000..602b831
--- /dev/null
+++ b/ckcapi-der.c
@@ -0,0 +1,177 @@
+/*
+ * Portions derived from NSS source files:
+ * lib/ckfw/capi/cobject.c
+ * lib/ckfw/capi/crsa.c
+ *
+ * Portions of this file:
+ * Copyright (C) Stef Walter 2008
+ *
+ */
+
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is the Netscape security libraries.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1994-2000
+ * the Initial Developer. All Rights Reserved.
+ * Portions created by Red Hat, Inc, are Copyright (C) 2005
+ *
+ * Contributor(s):
+ * Bob Relyea (rrelyea@redhat.com)
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#include "ckcapi.h"
+#include "ckcapi-der.h"
+
+/*
+ * unwrap a single DER value
+ */
+BYTE*
+ckcapi_der_unwrap(BYTE* src, DWORD n_src,
+ DWORD* n_result, BYTE** next)
+{
+ BYTE* start = src;
+ BYTE* end = src + n_src;
+ DWORD len = 0;
+
+ /* initialize error condition return values */
+ *n_result = 0;
+ if(next)
+ *next = src;
+
+ if(n_src < 2)
+ return start;
+
+ src++ ; /* skip the tag -- should check it against an expected value! */
+ len = (DWORD)*src++;
+ if(len & 0x80)
+ {
+ DWORD count = len & 0x7f;
+ len = 0;
+
+ if(count + 2 > n_src)
+ return start;
+
+ while(count-- > 0)
+ len = (len << 8) | (DWORD)*src++;
+ }
+
+ if(len + (src - start) > (DWORD)n_src)
+ return start;
+
+ if(next)
+ *next = src + len;
+
+ *n_result = len;
+ return src;
+}
+
+/*
+ * write a Decimal value to a string
+ */
+
+static char*
+put_decimal_string(char* cstr, DWORD value)
+{
+ DWORD tenpower;
+ BOOL first = TRUE;
+
+ for(tenpower = 10000000; tenpower; tenpower /= 10)
+ {
+ BYTE digit = (BYTE)(value / tenpower);
+ value = value % tenpower;
+
+ /* drop leading zeros */
+ if(first && (0 == digit))
+ continue;
+
+ first = FALSE;
+ *cstr++ = digit + '0';
+ }
+
+ /* if value was zero, put one of them out */
+ if(first)
+ *cstr++ = '0';
+
+ return cstr;
+}
+
+/*
+ * Create a Capi OID string value from a DER OID
+ */
+char*
+ckcapi_der_read_oid(BYTE* oid_tag, DWORD n_oid_tag)
+{
+ BYTE* oid;
+ char *oid_str;
+ char *cstr;
+ DWORD value;
+ DWORD n_oid;
+
+ /* wasn't an oid */
+ if(CKCAPI_DER_OBJECT_ID != *oid_tag)
+ return NULL;
+
+ oid = ckcapi_der_unwrap(oid_tag, n_oid_tag, &n_oid, NULL);;
+ if(n_oid < 2)
+ return NULL;
+
+ oid_str = malloc(n_oid * 4);
+ if(!oid_str)
+ return NULL;
+
+ cstr = oid_str;
+ cstr = put_decimal_string(cstr, (*oid) / 40);
+ *cstr++ = '.';
+ cstr = put_decimal_string(cstr, (*oid) % 40);
+ n_oid--;
+
+ value = 0;
+ while(n_oid--)
+ {
+ oid++;
+ value = (value << 7) + (*oid & 0x7f);
+ if(0 == (*oid & 0x80))
+ {
+ *cstr++ = '.';
+ cstr = put_decimal_string(cstr, value);
+ value = 0;
+ }
+ }
+
+ *cstr = 0; /* NULL terminate */
+
+ if(value != 0)
+ {
+ free(oid_str);
+ return NULL;
+ }
+
+ return oid_str;
+}