1/*
2 * Copyright (c) 2000-2001,2011,2014 Apple Inc. All Rights Reserved.
3 *
4 * The contents of this file constitute Original Code as defined in and are
5 * subject to the Apple Public Source License Version 1.2 (the 'License').
6 * You may not use this file except in compliance with the License. Please obtain
7 * a copy of the License at http://www.apple.com/publicsource and read it before
8 * using this file.
9 *
10 * This Original Code and all software distributed under the License are
11 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
12 * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
13 * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
14 * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
15 * specific language governing rights and limitations under the License.
16 */
17
18
19/*
20 * rc4Context.cpp - glue between AppleCSPContext and ssleay RC4 implementation
21 */
22
23#include "rc4Context.h"
24
25RC4Context::~RC4Context()
26{
27    if (rc4Key != NULL) {
28        CCCryptorRelease(rc4Key);
29    }
30    rc4Key = NULL;
31}
32
33/*
34 * Standard CSPContext init, called from CSPFullPluginSession::init().
35 * Reusable, e.g., query followed by en/decrypt.
36 */
37void RC4Context::init(
38	const Context &context,
39	bool encrypting)
40{
41	CSSM_SIZE	keyLen;
42	uint8 		*keyData 	= NULL;
43
44	/* obtain key from context */
45	symmetricKeyBits(context, session(), CSSM_ALGID_RC4,
46		encrypting ? CSSM_KEYUSE_ENCRYPT : CSSM_KEYUSE_DECRYPT,
47		keyData, keyLen);
48	if((keyLen < kCCKeySizeMinRC4) || (keyLen > kCCKeySizeMaxRC4)) {
49		CssmError::throwMe(CSSMERR_CSP_INVALID_ATTR_KEY);
50	}
51
52	/* All other context attributes ignored */
53	/* init the low-level state */
54    (void) CCCryptorCreateWithMode(0, kCCModeRC4, kCCAlgorithmRC4, ccDefaultPadding, NULL, keyData, keyLen, NULL, 0, 0, 0, &rc4Key);
55
56}
57
58/*
59 * All of these functions are called by CSPFullPluginSession.
60 */
61void RC4Context::update(
62	void 			*inp,
63	size_t 			&inSize, 			// in/out
64	void 			*outp,
65	size_t 			&outSize)			// in/out
66{
67    (void) CCCryptorUpdate(rc4Key, inp, inSize, outp, inSize, &outSize);
68}
69
70/* remainding functions are trivial for any stream cipher */
71void RC4Context::final(
72	CssmData 		&out)
73{
74	out.length(0);
75}
76
77size_t RC4Context::inputSize(
78	size_t 			outSize)			// input for given output size
79{
80	return outSize;
81}
82
83size_t RC4Context::outputSize(
84	bool 			final /*= false*/,
85	size_t 			inSize /*= 0*/) 	// output for given input size
86{
87	return inSize;
88}
89
90void RC4Context::minimumProgress(
91	size_t 			&in,
92	size_t 			&out) 				// minimum progress chunks
93{
94	in  = 1;
95	out = 1;
96}
97