1/*
2 * Copyright (c) 2007,2011 Apple Inc. All Rights Reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. Please obtain a copy of the License at
10 * http://www.opensource.apple.com/apsl/ and read it before using this
11 * file.
12 *
13 * The Original Code and all software distributed under the License are
14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
18 * Please see the License for the specific language governing rights and
19 * limitations under the License.
20 *
21 * @APPLE_LICENSE_HEADER_END@
22 */
23
24//
25// reqreader - Requirement language (exprOp) reader/scanner
26//
27#include "reqreader.h"
28#include <Security/SecTrustSettingsPriv.h>
29#include <security_utilities/memutils.h>
30#include <security_cdsa_utilities/cssmdata.h>	// for hex encoding
31#include "csutilities.h"
32
33namespace Security {
34namespace CodeSigning {
35
36
37//
38// Requirement::Reader
39//
40Requirement::Reader::Reader(const Requirement *req)
41	: mReq(req), mPC(sizeof(Requirement))
42{
43	assert(req);
44	if (req->kind() != exprForm)
45		MacOSError::throwMe(errSecCSReqUnsupported);
46}
47
48
49//
50// Access helpers to retrieve various data types from the data stream
51//
52void Requirement::Reader::getData(const void *&data, size_t &length)
53{
54	length = get<uint32_t>();
55	checkSize(length);
56	data = (mReq->at<void>(mPC));
57	mPC += LowLevelMemoryUtilities::alignUp(length, baseAlignment);
58}
59
60string Requirement::Reader::getString()
61{
62	const char *s; size_t length;
63	getData(s, length);
64	return string(s, length);
65}
66
67const unsigned char *Requirement::Reader::getHash()
68{
69	const unsigned char *s; size_t length;
70	getData(s, length);
71	if (length != SHA1::digestLength)
72		MacOSError::throwMe(errSecCSReqInvalid);
73	return s;
74}
75
76const unsigned char *Requirement::Reader::getSHA1()
77{
78	const unsigned char *digest; size_t length;
79	getData(digest, length);
80	if (length != CC_SHA1_DIGEST_LENGTH)
81		MacOSError::throwMe(errSecCSReqInvalid);
82	return digest;
83}
84
85void Requirement::Reader::skip(size_t length)
86{
87	checkSize(length);
88	mPC += length;
89}
90
91
92}	// CodeSigning
93}	// Security
94