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** prrng.h -- NSPR Random Number Generator
** lth. 29-Oct-1999.
#ifndef prrng_h___
#define prrng_h___
#include "prtypes.h"
** PR_GetRandomNoise() -- Get random noise from the host platform
** Description:
** PR_GetRandomNoise() provides, depending on platform, a random value.
** The length of the random value is dependent on platform and the
** platform's ability to provide a random value at that moment.
** The intent of PR_GetRandomNoise() is to provide a "seed" value for a
** another random number generator that may be suitable for
** cryptographic operations. This implies that the random value
** provided may not be, by itself, cryptographically secure. The value
** generated by PR_GetRandomNoise() is at best, extremely difficult to
** predict and is as non-deterministic as the underlying platfrom can
** provide.
** Inputs:
** buf -- pointer to a caller supplied buffer to contain the
** generated random number. buf must be at least as large as
** is specified in the 'size' argument.
** size -- the requested size of the generated random number
** Outputs:
** a random number provided in 'buf'.
** Returns:
** PRSize value equal to the size of the random number actually
** generated, or zero. The generated size may be less than the size
** requested. A return value of zero means that PR_GetRandomNoise() is
** not implemented on this platform, or there is no available noise
** available to be returned at the time of the call.
** Restrictions:
** Calls to PR_GetRandomNoise() may use a lot of CPU on some platforms.
** Some platforms may block for up to a few seconds while they
** accumulate some noise. Busy machines generate lots of noise, but
** care is advised when using PR_GetRandomNoise() frequently in your
** application.
** History:
** Parts of the model dependent implementation for PR_GetRandomNoise()
** were taken in whole or part from code previously in Netscape's NSS
** component.
NSPR_API(PRSize) PR_GetRandomNoise(
void *buf,
PRSize size
#endif /* prrng_h___ */
/* end prrng.h */