BN_rand man page on DigitalUNIX

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BN_rand(3)							    BN_rand(3)

NAME
       BN_rand, BN_pseudo_rand - Generate pseudo-random number

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
       The BN_rand() function generates a cryptographically strong pseudo-ran‐
       dom 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 num‐
       ber  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  BN_pseudo_rand() function 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.

       The  BN_rand_range()  function  generates  a  cryptographically	strong
       pseudo-random   number	rnd   in  the  range  0	 <lt>=	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 unpredictible.

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

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

HISTORY
       The  BN_rand()  function	 is  available	in  all versions of SSLeay and
       OpenSSL. The BN_pseudo_rand() function was added in OpenSSL 0.9.5.  The
       top  ==	-1 case and the BN_rand_range() function were added in OpenSSL
       0.9.6a.	BN_pseudo_rand_range() was added in OpenSSL 0.9.6c.

SEE ALSO
       Functions: bn(3), err(3), rand_ssl(3), RAND_add(3), RAND_bytes(3)

								    BN_rand(3)
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