projects / apple / security.git / blame
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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 | * castContext.h - glue between BlockCrytpor and ssleay CAST-128 (CAST5) | |
| 21 | * implementation | |
| 22 | * | |
| 23 | * Written by Doug Mitchell 4/24/2003 | |
| 24 | * | |
| 25 | * Here's what RFC 2144 has to say about CAST128 and CAST5 nomenclature: | |
| 26 | * | |
| 27 | * In order to avoid confusion when variable keysize operation is | |
| 28 | * used, the name CAST-128 is to be considered synonymous with the | |
| 29 | * name CAST5; this allows a keysize to be appended without ambiguity. | |
| 30 | * Thus, for example, CAST-128 with a 40-bit key is to be referred to | |
| 31 | * as CAST5-40; where a 128-bit key is explicitly intended, the | |
| 32 | * name CAST5-128 should be used. | |
| 33 | * | |
| 34 | * This module implements a variable key length, from 40 bits to 128 bits, | |
| 35 | * and can thus be said to implement both CAST-128 and CAST5. | |
| 36 | */ | |
| 37 | ||
| 38 | #ifndef _CAST_CONTEXT_H_ | |
| 39 | #define _CAST_CONTEXT_H_ | |
| 40 | ||
| 41 | #include "AppleCSPContext.h" | |
| 42 | #include "BlockCryptor.h" | |
| 43 | #include <CoreServices/../Frameworks/CarbonCore.framework/Headers/MacTypes.h> | |
| 44 | #include <CommonCrypto/CommonCryptor.h> | |
| 45 | #include "/usr/local/include/CommonCrypto/CommonCryptorSPI.h" | |
| 46 | ||
| 47 | class CastContext : public BlockCryptor { | |
| 48 | public: | |
| 49 | CastContext(AppleCSPSession &session); | |
| 50 | virtual ~CastContext(); | |
| 51 | ||
| 52 | // called by CSPFullPluginSession | |
| 53 | void init(const Context &context, bool encoding = true); | |
| 54 | ||
| 55 | // As an optimization, we allow reuse of a modified context. | |
| 56 | // The main thing we avoid is a redundant key scheduling. We | |
| 57 | // save the current raw keys bits in mRawKey and compare on | |
| 58 | // re-init. | |
| 59 | bool changed(const Context &context) { return true; } | |
| 60 | ||
| 61 | // called by BlockCryptor | |
| 62 | void encryptBlock( | |
| 63 | const void *plainText, // length implied (one block) | |
| 64 | size_t plainTextLen, | |
| 65 | void *cipherText, | |
| 66 | size_t &cipherTextLen, // in/out, throws on overflow | |
| 67 | bool final); | |
| 68 | void decryptBlock( | |
| 69 | const void *cipherText, // length implied (one cipher block) | |
| 70 | size_t cipherTextLen, | |
| 71 | void *plainText, | |
| 72 | size_t &plainTextLen, // in/out, throws on overflow | |
| 73 | bool final); | |
| 74 | ||
| 75 | private: | |
| 76 | void deleteKey(); | |
| 77 | ||
| 78 | /* scheduled key */ | |
| 79 | CCCryptorRef mCastKey; | |
| 80 | ||
| 81 | bool mInitFlag; // for easy reuse | |
| 82 | ||
| 83 | /* | |
| 84 | * Raw key bits saved here and checked on re-init to avoid | |
| 85 | * extra key schedule | |
| 86 | */ | |
| 87 | uint8 mRawKey[kCCKeySizeMaxCAST]; | |
| 88 | uint32 mRawKeySize; | |
| 89 | ||
| 90 | ||
| 91 | }; /* CastContext */ | |
| 92 | ||
| 93 | #endif //_CAST_CONTEXT_H_ |