1/* 2 * Copyright (c) 2000-2001,2011,2013-2014 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 * castContext.h - glue between BlockCrytpor and ssleay CAST-128 (CAST5) 21 * implementation 22 * 23 * 24 * Here's what RFC 2144 has to say about CAST128 and CAST5 nomenclature: 25 * 26 * In order to avoid confusion when variable keysize operation is 27 * used, the name CAST-128 is to be considered synonymous with the 28 * name CAST5; this allows a keysize to be appended without ambiguity. 29 * Thus, for example, CAST-128 with a 40-bit key is to be referred to 30 * as CAST5-40; where a 128-bit key is explicitly intended, the 31 * name CAST5-128 should be used. 32 * 33 * This module implements a variable key length, from 40 bits to 128 bits, 34 * and can thus be said to implement both CAST-128 and CAST5. 35 */ 36 37#ifndef _CAST_CONTEXT_H_ 38#define _CAST_CONTEXT_H_ 39 40#include "AppleCSPContext.h" 41#include "BlockCryptor.h" 42#include <CommonCrypto/CommonCryptor.h> 43#include <CommonCrypto/CommonCryptorSPI.h> 44 45class CastContext : public BlockCryptor { 46public: 47 CastContext(AppleCSPSession &session); 48 virtual ~CastContext(); 49 50 // called by CSPFullPluginSession 51 void init(const Context &context, bool encoding = true); 52 53 // As an optimization, we allow reuse of a modified context. 54 // The main thing we avoid is a redundant key scheduling. We 55 // save the current raw keys bits in mRawKey and compare on 56 // re-init. 57 bool changed(const Context &context) { return true; } 58 59 // called by BlockCryptor 60 void encryptBlock( 61 const void *plainText, // length implied (one block) 62 size_t plainTextLen, 63 void *cipherText, 64 size_t &cipherTextLen, // in/out, throws on overflow 65 bool final); 66 void decryptBlock( 67 const void *cipherText, // length implied (one cipher block) 68 size_t cipherTextLen, 69 void *plainText, 70 size_t &plainTextLen, // in/out, throws on overflow 71 bool final); 72 73private: 74 void deleteKey(); 75 76 /* scheduled key */ 77 CCCryptorRef mCastKey; 78 79 bool mInitFlag; // for easy reuse 80 81 /* 82 * Raw key bits saved here and checked on re-init to avoid 83 * extra key schedule 84 */ 85 uint8 mRawKey[kCCKeySizeMaxCAST]; 86 uint32 mRawKeySize; 87 88 89}; /* CastContext */ 90 91#endif //_CAST_CONTEXT_H_ 92