random.c File Reference

Random number generation. More...

#include <stddef.h>
#include <stdlib.h>
#include <time.h>

Go to the source code of this file.

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
	FILE_SECBOOT (PERMITTED)
void	srandom (unsigned int seed)
	Seed the pseudo-random number generator. More...
long int	random (void)
	Generate a pseudo-random number between 0 and 2147483647L or 2147483562? More...

Variables
static int32_t	rnd_seed = 0

Detailed Description

Random number generation.

Definition in file random.c.

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

FILE_SECBOOT()

FILE_SECBOOT

(

PERMITTED

)

srandom()

void srandom

(

unsigned int

seed

)

Seed the pseudo-random number generator.

Parameters

seed	Seed value

Definition at line 21 of file random.c.

                                   {
        rnd_seed = seed;
        if ( ! rnd_seed )
                rnd_seed = 4; /* Chosen by fair dice roll */
}

References rnd_seed.

Referenced by random(), srand(), and tcpip_random_okx().

random()

long int random

(

void

)

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

Return values

rand	Pseudo-random number

Definition at line 32 of file random.c.

                         {
        int32_t q;

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

        /* 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;
}

References NULL, rnd_seed, and srandom().

Referenced by arbel_alloc_qpn(), cipher_cost(), digest_cost(), dns_send_packet(), eap_rx_mschapv2_request(), efi_pxe_udp_write(), efi_snp_hii_random_guid(), eth_random_addr(), forcedeth_open(), hermon_alloc_qpn(), http_digest_authenticate(), ib_create_conn(), ib_create_qp(), inject_corruption_nonzero(), inject_fault_nonzero(), iscsi_handle_chap_c_value(), iscsi_open_connection(), loopback_test(), memcpy_test_speed(), ntlm_response(), peerdisc_create(), profile_test_exec(), rand(), start_dhcp(), start_dhcpv6(), tcp_open(), tcpip_bind(), tcpip_random_okx(), tls_client_hello(), tls_new_server_hello(), tls_send_client_key_exchange_pubkey(), vmbus_open(), and wep_encrypt().

Variable Documentation

rnd_seed

int32_t rnd_seed = 0

static

Definition at line 14 of file random.c.

Referenced by random(), and srandom().