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annotate nspr/pr/include/prrng.h @ 4:b513267f632f tip

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Build DBM module
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:58:03 +0200
parents 1e5118fa0cb1
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rev   line source
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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2 /* This Source Code Form is subject to the terms of the Mozilla Public
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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5
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6
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7 /*
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8 ** prrng.h -- NSPR Random Number Generator
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9 **
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10 **
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11 ** lth. 29-Oct-1999.
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12 */
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13
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14 #ifndef prrng_h___
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15 #define prrng_h___
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16
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17 #include "prtypes.h"
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18
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19 PR_BEGIN_EXTERN_C
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20
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21 /*
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22 ** PR_GetRandomNoise() -- Get random noise from the host platform
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23 **
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24 ** Description:
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25 ** PR_GetRandomNoise() provides, depending on platform, a random value.
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26 ** The length of the random value is dependent on platform and the
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27 ** platform's ability to provide a random value at that moment.
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28 **
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29 ** The intent of PR_GetRandomNoise() is to provide a "seed" value for a
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30 ** another random number generator that may be suitable for
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31 ** cryptographic operations. This implies that the random value
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32 ** provided may not be, by itself, cryptographically secure. The value
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33 ** generated by PR_GetRandomNoise() is at best, extremely difficult to
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34 ** predict and is as non-deterministic as the underlying platfrom can
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35 ** provide.
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36 **
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37 ** Inputs:
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38 ** buf -- pointer to a caller supplied buffer to contain the
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39 ** generated random number. buf must be at least as large as
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40 ** is specified in the 'size' argument.
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41 **
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42 ** size -- the requested size of the generated random number
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43 **
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44 ** Outputs:
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45 ** a random number provided in 'buf'.
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46 **
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47 ** Returns:
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48 ** PRSize value equal to the size of the random number actually
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49 ** generated, or zero. The generated size may be less than the size
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50 ** requested. A return value of zero means that PR_GetRandomNoise() is
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51 ** not implemented on this platform, or there is no available noise
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52 ** available to be returned at the time of the call.
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53 **
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54 ** Restrictions:
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55 ** Calls to PR_GetRandomNoise() may use a lot of CPU on some platforms.
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56 ** Some platforms may block for up to a few seconds while they
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57 ** accumulate some noise. Busy machines generate lots of noise, but
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58 ** care is advised when using PR_GetRandomNoise() frequently in your
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59 ** application.
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60 **
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61 ** History:
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62 ** Parts of the model dependent implementation for PR_GetRandomNoise()
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63 ** were taken in whole or part from code previously in Netscape's NSS
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64 ** component.
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65 **
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66 */
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67 NSPR_API(PRSize) PR_GetRandomNoise(
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68 void *buf,
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69 PRSize size
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70 );
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71
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72 PR_END_EXTERN_C
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73
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74 #endif /* prrng_h___ */
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75 /* end prrng.h */
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