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/*
* 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 "p11-capi.h"
#include "p11-capi-der.h"
/*
* unwrap a single DER value
*/
BYTE*
p11c_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*
p11c_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(P11C_DER_OBJECT_ID != *oid_tag)
return NULL;
oid = p11c_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;
}
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