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Diffstat (limited to 'ckcapi-der.c')
| -rw-r--r-- | ckcapi-der.c | 177 |
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; +} |