BN_pseudo_rand man page on DragonFly

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BN_RAND(3)		 BSD Library Functions Manual		    BN_RAND(3)

NAME
     BN_rand, BN_pseudo_rand, BN_rand_range, BN_pseudo_rand_range — 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
     BN_rand() generates a cryptographically strong pseudo-random number of
     bits bits in length and stores it in rnd.	If top is -1, the most signif‐
     icant 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.

     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 pro‐
     tocols, 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.

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)

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

BSD				March 29, 2024				   BSD
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