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