random_nz.h File Reference

HMAC_DRBG algorithm. More...

#include <stdint.h>

Go to the source code of this file.

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
	FILE_SECBOOT (PERMITTED)
int	get_random_nz (void *data, size_t len)
	Get random non-zero bytes.

Detailed Description

HMAC_DRBG algorithm.

Definition in file random_nz.h.

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

FILE_SECBOOT()

FILE_SECBOOT

(

PERMITTED

)

References data, and len.

get_random_nz()

int get_random_nz ( void * data, size_t len )

extern

Get random non-zero bytes.

Parameters

data	Output buffer
len	Length of output buffer

Return values

rc	Return status code

This algorithm is designed to be isomorphic to the Simple Discard Method described in ANS X9.82 Part 1-2006 Section 9.2.1 (NIST SP 800-90 Section B.5.1.1).

Definition at line 63 of file random_nz.c.

                                             {
        uint8_t *bytes = data;
        int rc;
 
        while ( len ) {
 
                /* Generate random byte */
                if ( ( rc = rbg_generate ( NULL, 0, 0, bytes, 1 ) ) != 0 )
                        return rc;
 
                /* Move to next byte if this byte is acceptable */
                if ( *bytes != 0 ) {
                        bytes++;
                        len--;
                }
        }
 
        return 0;
}

References bytes, data, len, NULL, rbg_generate(), and rc.

Referenced by rsa_encrypt().