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