GSP
Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Support
Contact Us
Online Help
Handbooks
Domain Status
Man Pages

FAQ
Virtual Servers
Pricing
Billing
Technical

Network
Facilities
Connectivity
Topology Map

Miscellaneous
Server Agreement
Year 2038
Credits
 

USA Flag

 

 

Man Pages


Manual Reference Pages  -  BN_RAND_RANGE (3)

.ds Aq ’

NAME

BN_rand, BN_pseudo_rand, BN_rand_range, BN_pseudo_rand_range - generate pseudo-random number

CONTENTS

SYNOPSIS



 #include <openssl/bn.h>

 int BN_rand(BIGNUM *rnd, int bits, int top, int bottom);

 int BN_pseudo_rand(BIGNUM *rnd, int bits, int top, int bottom);

 int BN_rand_range(BIGNUM *rnd, BIGNUM *range);

 int BN_pseudo_rand_range(BIGNUM *rnd, BIGNUM *range);



DESCRIPTION

BN_rand() generates a cryptographically strong pseudo-random number of bits in length and stores it in rnd. If top is -1, the most significant bit of the random number can be zero. If top is 0, it is set to 1, and if top is 1, the two most significant bits of the number will be set to 1, so that the product of two such random numbers will always have 2*bits length. If bottom is true, the number will be odd. The value of bits must be zero or greater. If bits is 1 then top cannot also be 1.

BN_pseudo_rand() does the same, but pseudo-random numbers generated by this function are not necessarily unpredictable. They can be used for non-cryptographic purposes and for certain purposes in cryptographic protocols, but usually not for key generation etc.

BN_rand_range() generates a cryptographically strong pseudo-random number rnd in the range 0 <= rnd < range. BN_pseudo_rand_range() does the same, but is based on BN_pseudo_rand(), and hence numbers generated by it are not necessarily unpredictable.

The PRNG must be seeded prior to calling BN_rand() or BN_rand_range().

RETURN VALUES

The functions return 1 on success, 0 on error. The error codes can be obtained by ERR_get_error(3).

SEE ALSO

bn(3), ERR_get_error(3), rand(3), RAND_add(3), RAND_bytes(3)
Search for    or go to Top of page |  Section 3 |  Main Index


1.1.0-pre3 BN_RAND (3) 2016-02-15

Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with manServer 1.07.