random.c File Reference

Random number generation. More...

#include <stdlib.h>
#include <gpxe/timer.h>

Go to the source code of this file.

Functions
	FILE_LICENCE (GPL2_OR_LATER)
void	srandom (unsigned int seed)
	Seed the pseudo-random number generator.
long int	random (void)
	Generate a pseudo-random number between 0 and 2147483647L or 2147483562?
Variables
static int32_t	rnd_seed = 0

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Detailed Description

Random number generation.

Definition in file random.c.

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Function Documentation

FILE_LICENCE

(

GPL2_OR_LATER

)

void srandom

(

unsigned int

seed

)

Seed the pseudo-random number generator.

Parameters:

seed

Seed value

Definition at line 19 of file random.c.

References rnd_seed.

Referenced by random(), and srand().

                                   {
        rnd_seed = seed;
}

long int random

(

void

)

Generate a pseudo-random number between 0 and 2147483647L or 2147483562?

Return values:

rand

Pseudo-random number

Definition at line 28 of file random.c.

References currticks(), rnd_seed, and srandom().

Referenced by forcedeth_reset(), get_random_bytes(), hermon_alloc_qpn(), ib_create_conn(), ib_create_qp(), iscsi_handle_chap_c_value(), rand(), tcp_open(), tls_new_server_hello(), tls_send_client_hello(), and wep_encrypt().

                         {
        int32_t q;

        if ( ! rnd_seed ) /* Initialize linear congruential generator */
                srandom ( currticks() );

        /* simplified version of the LCG given in Bruce Schneier's
           "Applied Cryptography" */
        q = ( rnd_seed / 53668 );
        rnd_seed = ( 40014 * ( rnd_seed - 53668 * q ) - 12211 * q );
        if ( rnd_seed < 0 )
                rnd_seed += 2147483563L;
        return rnd_seed;
}

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Variable Documentation

int32_t rnd_seed = 0 [static]

Definition at line 12 of file random.c.

Referenced by random(), and srandom().