1/*
2 * Copyright (c) 2000-2001 Apple Computer, 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 * Written by Doug Mitchell 04/03/2001
22 */
23
24#include "rc4Context.h"
25
26RC4Context::~RC4Context()
27{
28    if (rc4Key != NULL) {
29        CCCryptorRelease(rc4Key);
30    }
31    rc4Key = NULL;
32}
33
34/*
35 * Standard CSPContext init, called from CSPFullPluginSession::init().
36 * Reusable, e.g., query followed by en/decrypt.
37 */
38void RC4Context::init(
39	const Context &context,
40	bool encrypting)
41{
42	CSSM_SIZE	keyLen;
43	uint8 		*keyData 	= NULL;
44
45	/* obtain key from context */
46	symmetricKeyBits(context, session(), CSSM_ALGID_RC4,
47		encrypting ? CSSM_KEYUSE_ENCRYPT : CSSM_KEYUSE_DECRYPT,
48		keyData, keyLen);
49	if((keyLen < kCCKeySizeMinRC4) || (keyLen > kCCKeySizeMaxRC4)) {
50		CssmError::throwMe(CSSMERR_CSP_INVALID_ATTR_KEY);
51	}
52
53	/* All other context attributes ignored */
54	/* init the low-level state */
55    (void) CCCryptorCreateWithMode(0, kCCModeRC4, kCCAlgorithmRC4, ccDefaultPadding, NULL, keyData, keyLen, NULL, 0, 0, 0, &rc4Key);
56
57}
58
59/*
60 * All of these functions are called by CSPFullPluginSession.
61 */
62void RC4Context::update(
63	void 			*inp,
64	size_t 			&inSize, 			// in/out
65	void 			*outp,
66	size_t 			&outSize)			// in/out
67{
68    (void) CCCryptorUpdate(rc4Key, inp, inSize, outp, inSize, &outSize);
69}
70
71/* remainding functions are trivial for any stream cipher */
72void RC4Context::final(
73	CssmData 		&out)
74{
75	out.length(0);
76}
77
78size_t RC4Context::inputSize(
79	size_t 			outSize)			// input for given output size
80{
81	return outSize;
82}
83
84size_t RC4Context::outputSize(
85	bool 			final /*= false*/,
86	size_t 			inSize /*= 0*/) 	// output for given input size
87{
88	return inSize;
89}
90
91void RC4Context::minimumProgress(
92	size_t 			&in,
93	size_t 			&out) 				// minimum progress chunks
94{
95	in  = 1;
96	out = 1;
97}
98