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267 lines
6.1 KiB
C
267 lines
6.1 KiB
C
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the Netscape security libraries.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1994-2000
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "secder.h"
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#include <limits.h>
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#include "secerr.h"
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int
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DER_LengthLength(PRUint32 len)
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{
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if (len > 127) {
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if (len > 255) {
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if (len > 65535L) {
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if (len > 16777215L) {
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return 5;
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} else {
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return 4;
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}
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} else {
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return 3;
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}
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} else {
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return 2;
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}
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} else {
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return 1;
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}
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}
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unsigned char *
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DER_StoreHeader(unsigned char *buf, unsigned int code, PRUint32 len)
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{
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unsigned char b[4];
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b[0] = (unsigned char)(len >> 24);
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b[1] = (unsigned char)(len >> 16);
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b[2] = (unsigned char)(len >> 8);
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b[3] = (unsigned char)len;
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if ((code & DER_TAGNUM_MASK) == DER_SET
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|| (code & DER_TAGNUM_MASK) == DER_SEQUENCE)
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code |= DER_CONSTRUCTED;
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*buf++ = code;
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if (len > 127) {
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if (len > 255) {
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if (len > 65535) {
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if (len > 16777215) {
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*buf++ = 0x84;
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*buf++ = b[0];
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*buf++ = b[1];
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*buf++ = b[2];
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*buf++ = b[3];
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} else {
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*buf++ = 0x83;
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*buf++ = b[1];
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*buf++ = b[2];
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*buf++ = b[3];
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}
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} else {
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*buf++ = 0x82;
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*buf++ = b[2];
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*buf++ = b[3];
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}
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} else {
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*buf++ = 0x81;
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*buf++ = b[3];
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}
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} else {
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*buf++ = b[3];
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}
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return buf;
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}
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/*
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* XXX This should be rewritten, generalized, to take a long instead
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* of a PRInt32.
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*/
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SECStatus
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DER_SetInteger(PRArenaPool *arena, SECItem *it, PRInt32 i)
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{
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unsigned char bb[4];
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unsigned len;
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bb[0] = (unsigned char) (i >> 24);
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bb[1] = (unsigned char) (i >> 16);
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bb[2] = (unsigned char) (i >> 8);
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bb[3] = (unsigned char) (i);
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/*
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** Small integers are encoded in a single byte. Larger integers
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** require progressively more space.
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*/
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if (i < -128) {
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if (i < -32768L) {
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if (i < -8388608L) {
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len = 4;
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} else {
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len = 3;
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}
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} else {
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len = 2;
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}
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} else if (i > 127) {
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if (i > 32767L) {
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if (i > 8388607L) {
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len = 4;
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} else {
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len = 3;
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}
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} else {
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len = 2;
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}
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} else {
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len = 1;
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}
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it->data = (unsigned char*) PORT_ArenaAlloc(arena, len);
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if (!it->data) {
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return SECFailure;
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}
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it->len = len;
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PORT_Memcpy(it->data, bb + (4 - len), len);
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return SECSuccess;
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}
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/*
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* XXX This should be rewritten, generalized, to take an unsigned long instead
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* of a PRUint32.
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*/
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SECStatus
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DER_SetUInteger(PRArenaPool *arena, SECItem *it, PRUint32 ui)
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{
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unsigned char bb[5];
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int len;
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bb[0] = 0;
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bb[1] = (unsigned char) (ui >> 24);
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bb[2] = (unsigned char) (ui >> 16);
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bb[3] = (unsigned char) (ui >> 8);
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bb[4] = (unsigned char) (ui);
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/*
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** Small integers are encoded in a single byte. Larger integers
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** require progressively more space.
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*/
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if (ui > 0x7f) {
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if (ui > 0x7fff) {
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if (ui > 0x7fffffL) {
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if (ui >= 0x80000000L) {
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len = 5;
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} else {
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len = 4;
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}
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} else {
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len = 3;
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}
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} else {
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len = 2;
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}
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} else {
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len = 1;
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}
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it->data = (unsigned char *)PORT_ArenaAlloc(arena, len);
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if (it->data == NULL) {
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return SECFailure;
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}
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it->len = len;
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PORT_Memcpy(it->data, bb + (sizeof(bb) - len), len);
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return SECSuccess;
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}
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/*
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** Convert a der encoded *signed* integer into a machine integral value.
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** If an underflow/overflow occurs, sets error code and returns min/max.
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*/
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long
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DER_GetInteger(SECItem *it)
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{
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long ival = 0;
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unsigned len = it->len;
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unsigned char *cp = it->data;
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unsigned long overflow = 0x1ffUL << (((sizeof(ival) - 1) * 8) - 1);
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unsigned long ofloinit;
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if (*cp & 0x80)
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ival = -1L;
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ofloinit = ival & overflow;
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while (len) {
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if ((ival & overflow) != ofloinit) {
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PORT_SetError(SEC_ERROR_BAD_DER);
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if (ival < 0) {
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return LONG_MIN;
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}
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return LONG_MAX;
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}
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ival = ival << 8;
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ival |= *cp++;
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--len;
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}
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return ival;
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}
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/*
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** Convert a der encoded *unsigned* integer into a machine integral value.
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** If an underflow/overflow occurs, sets error code and returns min/max.
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*/
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unsigned long
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DER_GetUInteger(SECItem *it)
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{
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unsigned long ival = 0;
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unsigned len = it->len;
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unsigned char *cp = it->data;
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unsigned long overflow = 0xffUL << ((sizeof(ival) - 1) * 8);
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/* Cannot put a negative value into an unsigned container. */
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if (*cp & 0x80) {
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PORT_SetError(SEC_ERROR_BAD_DER);
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return 0;
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}
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while (len) {
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if (ival & overflow) {
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PORT_SetError(SEC_ERROR_BAD_DER);
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return ULONG_MAX;
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}
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ival = ival << 8;
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ival |= *cp++;
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--len;
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}
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return ival;
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}
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