1 | // |
2 | // RandomStream.h |
3 | // |
4 | // Library: Foundation |
5 | // Package: Crypt |
6 | // Module: RandomStream |
7 | // |
8 | // Definition of class RandomInputStream. |
9 | // |
10 | // Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH. |
11 | // and Contributors. |
12 | // |
13 | // SPDX-License-Identifier: BSL-1.0 |
14 | // |
15 | |
16 | |
17 | #ifndef Foundation_RandomStream_INCLUDED |
18 | #define Foundation_RandomStream_INCLUDED |
19 | |
20 | |
21 | #include "Poco/Foundation.h" |
22 | #include "Poco/BufferedStreamBuf.h" |
23 | #include <istream> |
24 | |
25 | |
26 | namespace Poco { |
27 | |
28 | |
29 | class Foundation_API RandomBuf: public BufferedStreamBuf |
30 | /// This streambuf generates random data. |
31 | /// On Windows NT, the cryptographic API is used. |
32 | /// On Unix, /dev/random is used, if available. |
33 | /// Otherwise, a random number generator, some |
34 | /// more-or-less random data and a SHA-1 digest |
35 | /// is used to generate random data. |
36 | { |
37 | public: |
38 | RandomBuf(); |
39 | ~RandomBuf(); |
40 | int readFromDevice(char* buffer, std::streamsize length); |
41 | }; |
42 | |
43 | |
44 | class Foundation_API RandomIOS: public virtual std::ios |
45 | /// The base class for RandomInputStream. |
46 | /// |
47 | /// This class is needed to ensure the correct initialization |
48 | /// order of the stream buffer and base classes. |
49 | { |
50 | public: |
51 | RandomIOS(); |
52 | ~RandomIOS(); |
53 | RandomBuf* rdbuf(); |
54 | |
55 | protected: |
56 | RandomBuf _buf; |
57 | }; |
58 | |
59 | |
60 | class Foundation_API RandomInputStream: public RandomIOS, public std::istream |
61 | /// This istream generates random data |
62 | /// using the RandomBuf. |
63 | { |
64 | public: |
65 | RandomInputStream(); |
66 | ~RandomInputStream(); |
67 | }; |
68 | |
69 | |
70 | } // namespace Poco |
71 | |
72 | |
73 | #endif // Foundation_RandomStream_INCLUDED |
74 | |