[80] | 1 | // |
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| 2 | // RandomStream.h |
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| 3 | // |
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| 4 | // $Id: //poco/1.3/Foundation/include/Poco/RandomStream.h#1 $ |
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| 5 | // |
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| 6 | // Library: Foundation |
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| 7 | // Package: Crypt |
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| 8 | // Module: RandomStream |
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| 9 | // |
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| 10 | // Definition of class RandomInputStream. |
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| 11 | // |
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| 12 | // Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH. |
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| 13 | // and Contributors. |
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| 14 | // |
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| 15 | // Permission is hereby granted, free of charge, to any person or organization |
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| 16 | // obtaining a copy of the software and accompanying documentation covered by |
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| 17 | // this license (the "Software") to use, reproduce, display, distribute, |
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| 18 | // execute, and transmit the Software, and to prepare derivative works of the |
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| 19 | // Software, and to permit third-parties to whom the Software is furnished to |
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| 20 | // do so, all subject to the following: |
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| 21 | // |
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| 22 | // The copyright notices in the Software and this entire statement, including |
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| 23 | // the above license grant, this restriction and the following disclaimer, |
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| 24 | // must be included in all copies of the Software, in whole or in part, and |
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| 25 | // all derivative works of the Software, unless such copies or derivative |
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| 26 | // works are solely in the form of machine-executable object code generated by |
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| 27 | // a source language processor. |
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| 28 | // |
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| 29 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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| 30 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 31 | // FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT |
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| 32 | // SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE |
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| 33 | // FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, |
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| 34 | // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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| 35 | // DEALINGS IN THE SOFTWARE. |
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| 36 | // |
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| 37 | |
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| 38 | |
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| 39 | #ifndef Foundation_RandomStream_INCLUDED |
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| 40 | #define Foundation_RandomStream_INCLUDED |
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| 41 | |
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| 42 | |
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| 43 | #include "Poco/Foundation.h" |
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| 44 | #include "Poco/BufferedStreamBuf.h" |
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| 45 | #include <istream> |
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| 46 | |
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| 47 | |
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| 48 | namespace Poco { |
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| 49 | |
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| 50 | |
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| 51 | class Foundation_API RandomBuf: public BufferedStreamBuf |
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| 52 | /// This streambuf generates random data. |
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| 53 | /// On Windows NT, the cryptographic API is used. |
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| 54 | /// On Unix, /dev/random is used, if available. |
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| 55 | /// Otherwise, a random number generator, some |
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| 56 | /// more-or-less random data and a SHA-1 digest |
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| 57 | /// is used to generate random data. |
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| 58 | { |
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| 59 | public: |
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| 60 | RandomBuf(); |
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| 61 | ~RandomBuf(); |
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| 62 | int readFromDevice(char* buffer, std::streamsize length); |
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| 63 | }; |
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| 64 | |
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| 65 | |
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| 66 | class Foundation_API RandomIOS: public virtual std::ios |
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| 67 | /// The base class for RandomInputStream. |
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| 68 | /// |
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| 69 | /// This class is needed to ensure the correct initialization |
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| 70 | /// order of the stream buffer and base classes. |
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| 71 | { |
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| 72 | public: |
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| 73 | RandomIOS(); |
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| 74 | ~RandomIOS(); |
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| 75 | RandomBuf* rdbuf(); |
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| 76 | |
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| 77 | protected: |
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| 78 | RandomBuf _buf; |
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| 79 | }; |
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| 80 | |
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| 81 | |
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| 82 | class Foundation_API RandomInputStream: public RandomIOS, public std::istream |
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| 83 | /// This istream generates random data |
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| 84 | /// using the RandomBuf. |
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| 85 | { |
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| 86 | public: |
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| 87 | RandomInputStream(); |
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| 88 | ~RandomInputStream(); |
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| 89 | }; |
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| 90 | |
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| 91 | |
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| 92 | } // namespace Poco |
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| 93 | |
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| 94 | |
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| 95 | #endif // Foundation_RandomStream_INCLUDED |
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